CN108141241A - Transceiver apparatus - Google Patents
Transceiver apparatus Download PDFInfo
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- CN108141241A CN108141241A CN201680054878.0A CN201680054878A CN108141241A CN 108141241 A CN108141241 A CN 108141241A CN 201680054878 A CN201680054878 A CN 201680054878A CN 108141241 A CN108141241 A CN 108141241A
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- transceiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
- H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/08—Time-division multiplex systems
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The present invention provides a kind of transceiver of wireless telecom equipment, meets noiseproof feature and intermodulation component sends requirement, without the high cost surface acoustic wave filter in front-end circuit.On the contrary, the LC wave filters (211 216) of low cost are used, and by reducing RX path (224) second-order distortion tolerance intentionally, received signal strength is measured when switching between sending mode and reception pattern, and according to measuring condition low-noise amplifier (226) gain, realize the tolerance to obstruction.In transmitter circuit; the baseband frequency translation being pre-selected is introduced in the digital domain; and translation is compensated by the adjusting of local oscillator signals so that the intermodulation frequency that non-linear base band component is generated falls in the outside of protection transmission band rather than protect the inside of transmission band.
Description
Technical field
The embodiment of the present invention is usually directed to transceiver apparatus, divides multiplexing (Time Division when in use
Duplex, TDD) or be time-multiplexed with having specific application in the wireless communication system of the combination of frequency division multiplexing.
Background technology
Wireless communication system, such as the third generation (third-generation, 3G) mobile phone standard and technology are many institutes
Known.Such 3G standard and technology are got up by third generation cooperative relationship project development.Communication system and network also direction
Wide-band mobile systems develop.Long term evolution (Long Term Evolution, LTE) has been developed in third generation cooperative relationship project
Solution.The 12nd edition version of third generation cooperative relationship project and the 13rd version specify some requirement for mobile terminal (or
Person's user equipment).(half duplex frequency division are multiplexed using so-called Half-duplex Frequency Division
Duplexing, HD-FDD), the 0th tactful user equipment (user equipment, UE), which can access, to be eated dishes without rice or wine, wherein sending signal
It occupies with matching the relevant different channels of frequency spectrum with signal is received, is in addition sent and received in individual time slot.
The existing transceiver apparatus operated using Half-duplex Frequency Division multiplexing uses surface acoustic wave (surface
Acoustic wave, SAW) wave filter, with its precipitous cut-off characteristics, for Signal Regulation.For each support frequency band,
Special SAW filter is needed, unless two support band overlappings, such as frequency band 5 and frequency band 26 or frequency band 2 and frequency band 25
Situation.If several frequency bands are supported by UE, but the quantity of the reception input of transceiver apparatus is limited, then is also required to carry out
RF band switchings.Which increase costs and transceiver insertion loss.Fig. 1 shows the basis of the existing HD-FDD transceivers of single band
Framework.Transceiver includes module 100, including base band and the RF circuits realized in integrated circuit.Transceiver also includes switch dress
101 are put, switches single antenna 102 between sending line 103 and receiving line 104 respectively.It sends line 103 and shows power amplifier
105 and send band logical SAW filter 106.Line 104 is received to include receiving band logical SAW 107.The component of Fig. 1 is generally mounted at
On printed circuit board (printed circuit board, PCB).The requirement of transmitting filter 106 is such as frequency band to frequency band
And change.In some frequency bands, stringent transmission specification is suitable near tranmitting frequency.This needs special filtering, and at these
In situation, SAW filter is commonly used in the relatively low inessential transmission of holding.SAW filter 107 is received for providing band external blocking
The inhibition of (or interference signal), and third generation cooperative relationship project standard defines a large amount of survey that receiver has to comply with
Try example.In general, in order to meet these requirements, SAW filter is used.For the UE especially operated using HD-FDD,
Another challenge is that it is needed and access same frequency band but is operated with fdd mode or HD-FDD patterns but when occupying different
Gap coexists for other UE sent and received.For example, the signal sent by HDD-FDD UE can represent to nearby into
The potential very big interference of other similar UE of row operation.
SAW filter occupies larger area on PCB, and makes costliness.Needed in the transceiver of SAW filter
Must switching for wanting also increases size and cost.Therefore it provides do not need to using SAW filter but still will satisfactorily work
Work will be advantageous.Since different countries specifies the different frequency bands of mobile communication, the receipts of UE that can be used in the whole world are provided
Hair device will be also advantageous.
Be presented to for the problem of designer of the receiver of mobile communication be to block (or interference signal) tolerance
Property.In existing equipment, using RMS power detectors or envelope detector, the detection of obstruction is performed.It is desirable that detector
It is placed between the first stage of low-noise amplifier and second stage, at this point, circuit is less sensitive, but signal is still
Broadband.However, such circuit occupies larger silicon area, power is consumed, and is difficult design essence under conditions of wider range
True power measurement.In addition, mean power is not a unessential experiment, and its usually using simulation difficult to realize it is average with
The combination of digital averaging.Therefore it provides a kind of simple mechanism detects and compensates the presence of the obstruction in mobile communication receiver
It will be advantageous.
It is the non-essential transmission that falls into protection band to be presented to for the problem of designer of the transmitter of mobile communication
The inhibition of frequency product (product) (for example, intermodulation component).The existing requirement of receiver filter in UE can be with frequency
It takes frequency band to and changes.For most of frequency band, simple low-pass filter can inhibit the harmonic wave of power amplifier enough,
For example, the harmonic wave at 2 times of special carrier frequency or 3 times.However, in some frequency bands, stringent transmission specification is fitted
For that may need near the transmission frequency of special filtering.Traditionally, in such cases, SAW filter is used to keep relatively low
It sends.The transmitter for providing using more inexpensive wave filter but still meeting transmission specification will be advantageous.
The embodiment of the present invention provides a kind of transceiver architecture, does not need to SAW filter or related switch component
It uses, but its performance is suitable with the transceiver including SAW filter.Further embodiment provides with for detection obstruction
Simplification device receiver and with for inhibit inessential transmission frequency product device transmitter.
The embodiments described below are not limited to solve the imperfect embodiment of any shortcoming or institute of known system.
Invention content
The content of present invention, which is provided, is below introduced reduced form further described in a specific embodiment with one kind
The selection of concept.The content of present invention is neither intended to the key feature or foundation characteristic of determining theme claimed, also not purport
The range of theme claimed is determined in auxiliary.
According to the first aspect of the invention, a kind of transceiver is provided, with front-end module, including N number of transmitting path
With N number of RX path, wherein N is integer, each includes a wave filter in transmitting path and RX path, wherein each filtering
The passband of device is selected so that the harmonic wave of multiple inband signalings is filtered out, and N is selected so that total passband of transceiver extends to
Multiple Radio Access Networks.
Transceiver can be integrated into user equipment either in the wireless telecom equipment of any other form or for
In the base station that wireless telecom equipment carries out wireless communication.
Preferably, the selection of the frequency passband of these wave filters allows any user equipment to be used in the whole world.This
A little wave filters can include low-pass filter, bandpass filter.These wave filters can be filtered relative to SAW
For device, a type of simple structure of larger area is cheaply generated and prevented take up.Advantageously, transceiver does not require RF bands to cut
It changes, SAW filter is being used to be required, so as to further save cost and size.In one embodiment, in RX path
These wave filters include the use of five rank LC wave filters of the 1st Chebyshev (Chebyshev) topology.The removal of SAW filter
And come from transceiver RF switching also reduce receiver insertion loss.This improves sensitivity.
Preferably, each transmitting path and the bandwidth of RX path are selected to sufficiently low to allow impedance matching and frequency band
Tuning.
Preferably, the frequency range of each receiving port in each RX path is configured to be well below frequency multiplication,
With in order to allow effectively to filter harmonic wave.
Preferably, each send and receive path frequency range be selected to it is sufficiently wide to include all interested frequencies
Band, but keep needing the quantity of the receiving port covered for world-wide frequency band low.It is for example, logical for the 0th strategy uses of LTE three
Band, and therefore three wave filters in each in RX path and transmitting path can be used.Selected signal road
Diameter is independent of selected practical LTE frequency bands, but many wide frequency ranges fallen into the LTE frequency bands used.
In one embodiment, ISM bandstop filters are provided at antenna end, in order to inhibit transmitter noise and obstruction
Into in ISM band.Situation about wirelessly being coexisted with the Wi-Fi nearby operated may be obtained with transmitting by being received in high frequency band LET
In, this improvement is especially useful.
According to the second aspect of the invention, a kind of method for optimizing the gain of amplifier in receiver, this method are provided
Including：Second-order distortion is introduced into receiver；Measure the amplitude of received signal strength；It will be put according to measured signal strength
One quantity of gain-adjusted of big device；And remove second-order distortion.
According to the third aspect of the invention we, a kind of receiver is provided, including variable gain amplifier and processor,
Middle processor measures the amplitude of received signal strength, according to measured signal for second-order distortion to be introduced into receiver
Intensity is by one quantity of gain-adjusted of amplifier and removes second-order distortion.
In one example, by the gain offsets between the positive ingredient of the differential signal of introducing receiver and negative ingredient,
It can complete to introduce second-order distortion, increase or be added in receiver.Have receiver and include difference channel, for place
Signal of the reason with positive path and negative path, in order to tune inessential second order distortion component.Pass through the one of intentional Introduction Time
The second-order distortion in period, the present invention use the presence of this circuit, during this period, can carry out total received signal power
It measures.For this kind of receiver being merged into UE, the period of the time measured can be set to be sent with UE
To the period overlapping for receiving parallel moving of signal.During the hydraulic performance decline (being the intentional introduction because of second-order distortion) of receiver, band
The presence of external blocking signal leads to the increase of in-band noise power.Then, total received signal power of measurement is the spy after combining
Determine the power and out-of-band power of signal.In one embodiment, if the amplitude of this total received power be measured to be located at or
Person is less than the design point of receiver, then amplifier (be typically low-noise amplifier (low noise amplifier, LNA))
Gain be held it is high as much as possible, in order to optimize its noise pattern.If the amplitude of total received power is measured to more than pre-
If threshold value, then the gain of amplifier can be gradually decreased, this will reduce receiver sensitivity, in the amplitude of total received power
It is measured to more than in the case of some default maximum horizontals, the reception of signal can be dropped and reschedule for follow-up
Time.One example of obstruction is TV transmission, to a certain extent, can be pressed down by the high-pass filtering in low-frequency band RX path
System.
According to the fourth aspect of the invention, a kind of method that transmission for reducing intermodulation component in transmitter influences is provided,
This method includes frequency translation being introduced into digital baseband signal, and pass through the local oscillations for introducing equal and opposite quantity
The translation of device frequency compensates frequency translation.
According to the fifth aspect of the invention, a kind of transmitter is provided, frequency translation is introduced into digital base including being used for
Device and controller in band signal are used to adjust the frequency of local oscillator signals, in order to compensate for frequency translation.
In one embodiment, include Digital rotator for introducing the device of frequency translation, by digital baseband signal
In-phase component and out-phase component be multiplied by the cosine component and sinusoidal component of time varying signal respectively, to generate multiple frequency translation numbers
Word baseband signal, transmitter further include：Digital-to-analog converter, for multiple frequency translation digital baseband signals to be converted into
Multiple frequency translation analog baseband signals and frequency mixer, for by multiple frequency translation analog baseband signals with it is programmable this
Ground oscillator signal is mixed, to generate special carrier frequency.
Advantageously, transmitter according to embodiments of the present invention can be used for so that non-essential intermodulation frequency component falls into and more leans on
Near send limits less stringent frequency band.Optionally, due to non-linear in base band component, such as digital to analogy conversion
Device, frequency mixer and wave filter, intermodulation component generally occur within.Consider that transmission will occur in frequency band 13 (i.e. 782MHz), and broadband is public
Safety zone is located at the example of 763-768MHz altogether.In the distribution of certain resource blocks, five ranks generated in base band send chain are mutual
Adjust component that will fall into protection band.By translating baseband frequency, transmitter can improve the influence of this intermodulation component.In order to compensate for
This translation, local oscillator frequencies are translated equal and opposite quantity.Signal specific is appeared in correct position, is because of frequency
Rate translation is mutually canceled.However, inessential frequency component, which is now fallen into, limits less stringent frequency band closer to transmission.Cause
This, inhibits inessential band component, such as SAW filter without sending filtering.
Preferably, these frequency shift (FS)s are carried out with higher transmission power, wherein sending carrier wave leakage (leakage)
(local oscillator feed-in) is sufficiently low inessential frequency band will not be caused to send.At lower power, intermodulation product is much lower, letter
It number can be sent in a conventional manner.
Description of the drawings
In conjunction with the following drawings, by way of example, the embodiment of the present invention will be described, wherein：
Fig. 1 is a kind of structure block diagram of existing transceiver apparatus；
Fig. 2 is the structure block diagram of transceiver according to embodiments of the present invention；
Fig. 3 is the simplified flowchart for the method for showing adjusting amplifier gain according to embodiments of the present invention；And
Fig. 4 is the simple flow for showing the method for the transmission of intermodulation component in control transmitter according to embodiments of the present invention
Figure.
Specific embodiment
The embodiment being only described by way of example below.These example representations implement the best side of the present invention
Formula, although it is not the sole mode for realizing the present invention, at present to known to applicant.These descriptions elaborate exemplary
The sequence of function and step is for construction and operation example.But identical or equivalent function and operating process can be by
Different example is completed.
As shown in Fig. 2, transceiver 200 includes RF and baseband module 201 and front-end module 202.Transceiver can be merged
Into user equipment, antenna 204 is switched in RX path 205, RX path 206 and RX path 207 by switch module 203
One in these three RX paths and transmitting path 208, transmitting path 209 and transmitting path 210 these three transmitting pathes.
Each RX path and transmitting path, i.e. 205-210 respectively include wave filter 211- wave filters 216, and each wave filter quilt
Selection is with specific bandwidth.The frequency range of each wave filter is selected to permit Global coverage, and for filtering out with interior letter
Number inessential harmonic wave, especially in RX path.
In one embodiment, RX path 205 and transmitting path 214 are lowband paths, and its respective filtering
Device 211 and wave filter 216, which have, covers multiple first evolved General Mobile electrical communication system terrestrial access networks
(Evolved Universal Mobile Telecommunication System Territorial Radio Access
Network, E-UTRAN, E-UTRAN) frequency band and with 694-960MHz bandwidth passband.RX path 206 and transmitting path
215 be intermediate frequency band path, and its respective wave filter 212 and wave filter 215 have the multiple 2nd E-UTRAN frequency bands of covering
And the passband with 1710-2200MHz bandwidth.RX path 207 and transmitting path 210 are highband paths, and it is respectively
Wave filter 213 and wave filter 216 with covering multiple 3rd E-UTRAN frequency bands and leading to 2300-2690MHz bandwidth
Band.This selection of bandwidth allows the Global coverage of transceiver 200, also ensure with interior second harmonic and more than be filtered out.
In another embodiment, low-down band path is added to covering E-UTRAN frequency bands 31, and each transmitting path is with connecing
The wave filter with 380-470MHz passbands can be included by receiving path.
In an alternative embodiment, wave filter 211- wave filters 216 are low-pass filters.In this embodiment, in low
The wave filter 211 and wave filter 214 of passband have the cutoff frequency of 960MHz, 212 He of wave filter in intermediate frequency band path
Wave filter 215 has 2200 cutoff frequency, and wave filter 213 and wave filter 216 in highband path are with 2960 section
Only frequency.Bandwidth this selection again allow transceiver 200 Global coverage, also ensure with interior third harmonic and more than filtered
It removes.
In another embodiment, it is set to include the LTE frequency bands 11 of Japan and LTE frequency bands 21, intermediate frequency band path
Into with the passband from 1428MHz to 2200MHz.
Transmitting path 208, transmitting path 209 and transmitting path 210 in front-end module 202 respectively include amplifier 217,
Amplifier 218 and amplifier 219.The output of each amplifier is respectively connected to wave filter 214, wave filter 215 and wave filter
One in 216, and one in each amplifier, i.e. amplifier 217, amplifier 218 and amplifier 219, from RF and base
Band module 201 receives respective input.
In this example, wave filter 211- wave filters 216 are passive LC filters.
RF includes receiving circuit 220 and transmission circuit 221 with baseband module 201.RF also includes number with baseband module 201
Signal processor 222 has the first output 223 for being connected to module 224.Receiving circuit 220 is represented in 224 principle of module
Receive the difference channel of mixer module 225.Digital signal processor 222 is used to provide the control signal at its output 223, with
For controlling difference channel 224 in a manner of being explained below.The reception mixer module 225 of receiving circuit 220 is from low noise
Amplifier module 226 receives input, once signal passes through respective wave filter 211, wave filter 212 and wave filter 213, low noise
Amplifier module 226 receives signal from lowband path 205, intermediate frequency band path 206 and highband path 207 successively.Number
Second output of signal processor 222 is connected to low noise amplifier module 226, and for the tune in a manner of being explained below
Section includes the gain of at least one low-noise amplifier of module 226.Receiving circuit 220 receives the defeated of mixer module 225
Go out through low-pass filter 227, then by amplifier 228, and then pass through AD converter 229, simulation to number
The output of word converter 229 is fed into digital signal processor 222.
Transmission circuit 221 includes sending mixer module 230, has the first input for being connected to local oscillator 231
And the lowband path of front-end module 202, intermediate frequency band path and highband path are connected to by amplifier module 232
Three outputs of respective wave filter 214, wave filter 215 and wave filter 216.The third output quilt of digital signal processor 222
It is connected to local oscillator control module 233.The output for sending carrier shift control module is connected to local oscillator 231.Number
4th output of word signal processor 222 is connected to Digital rotator (digital rotator) module 234.Digital rotator
The output of module 234 is connected to digital-to-analog converter 235, and the output of digital-to-analog converter 235 is consecutively connected to low pass
Wave filter 236, the output of low-pass filter 236 pass through amplifier 237 to the input for sending mixer module 230.
Measurement and the method for compensating obstruction (interference signal) will now be described.In the usual course, it is logical when being received by antenna 204
When believing signal, the RF signals received on one in RX path 205, RX path 206 and RX path 207 are converted
Into the base band (by being mixed with the signal for coming from local oscillator 231) received in mixer module 225, filtered simultaneously
Digital signal is converted into for receiving, and handled by digital signal processor 222 by AD converter 229.
When each transceiver switches between sending mode and reception pattern, the second-order distortion tolerance (second of receiving circuit 220
Order distortion toleration) intentionally reduced.During this switching between modes, Digital Signal Processing
Generate signal on device 222 online 223, in principle as shown in being introduced into the offset of difference channel 224, cause mixer components it
Between offset.For example, under the control of digital signal processor 222, the positive component that forms of the differential signal in circuit 224 is with bearing
The gain offsets formed between component are introduced into.This offset creates intermodulation component due to falling into the band external blocking in band, and
It is tested in digital signal processor 222 during this period that it can be between the switching from sending mode to reception pattern
Amount.Once being measured, this offset is removed.According to measurement as a result, digital signal processor 222 adjusts receiving circuit amplification
Gain in device module 226.During next period of switching between sending mode and reception pattern, Digital Signal Processing
Device 222 reduces second-order distortion tolerance again, measures total received power, then removes offset, and if appropriate, then adjusts and put again
Big device gain, for optimizing performance.During each period of switching between sending mode and reception pattern, this flow
It can be repeated.The total received power of measurement can be with the design standard of receiver and the gain adjusted to optimize performance
It is compared.A method for introducing necessary offset is by the way that the bias point of frequency mixer clock signal is translated.Due to inclined
The average DC levels or overall average in-band noise moving and create are the direct measurements into the out-of-band noise of receiver.In general,
Main intermodulation product is can be by the average DC items of digital signal processor 222.It will be appreciated that it is automatic consider with it is modulated
The humorous relevant any RF filtering of circuit.Also it will be noted that, compared with nearly n interference sources, remote band external blocking will be in frequency mixer plane
Place has more low amplitude relatively, and therefore will generate more low scale.Also it will be appreciated that, for increasing or adding second order
Other existing ways of distortion are applicable.
By being switched in unloaded (dummy loads) and changing current bias, to come from Digital Signal Processing
The mode of the signal of device 222, the gain of receiver amplifier 226 can be controlled.Increase with the obstruction power of measurement, it can be with
Continuously decrease the gain of amplifier 226.If the obstruction power measured is relatively low, gain can be increased.
The method that the transmission for the intermodulation component for reducing transmission circuit 221 influences will now be described.When transmission comes from antenna
During the modulated signal of 204 number I/O, come from the Q signal of digital signal processor 222 by 235 turns of digital-to-analog converter
Change base-band analog signal (at predeterminated frequency) into, and by being mixed to be turned upwards with coming from the signal of local oscillator
Change special carrier frequency into.In general, using the fixation local oscillator signals generated in the phase-locked loop module of transmitter, base band letter
It number is converted upwards.In fig. 2, the phase (I signal) that amplifier 237 exports can be multiplied by the cosine of local oscillator signals,
The orthogonal signalling (Q signal) that amplifier 237 exports can be multiplied by the sine of local oscillator signals.Usually using two circuits or
The division of multiphase filter can complete orthogonal generation.In addition, in the transceiver of Fig. 2, frequency is performed to digital signal samples
Frequency translation (frequency shift) is added in numeric field by the Digital rotator module 234 of conversion.Form transmission circuit
In 221 the digital-to-analog converter 235 of the simulated assembly of baseband circuit, wave filter 236 and amplifier 237 generally generate it is non-must
The intermodulation frequency component wanted is because it with perfect linear mode without being worked.These intermodulation components may fall into protection
In band, if so its transmission can be prevented from, it will be advantageous.The transceiver of Fig. 2 is enabled these non-essential intermodulation
Frequency component moves to the frequency band of self-shield band removal.By the frequency for translating baseband signal so that by non-linear base band component
The intermodulation frequency component generated is fallen on except protection band, so as to complete this.It is that it should be to ensure to send carrier frequency
Appearance, in response to coming from the signal of digital signal processor 222, under the control of control module 233, equal amplitude but with
The opposite compensating frequency deviation that translates being applied in baseband signal is applied to local oscillator 231.
Digital rotator module 234 performs appropriate baseband frequency translation in the digital domain.The technology of number rotation is
Know, and substantially include the cosine component of time varying signal and sinusoidal component are multiplied by I signal sample and Q signal sample respectively
Originally, I signal sample and Q signal sample standard deviation come from the output of digital signal processor 222.Therefore, I signal sample and Q letters
Number sample reaches digital-to-analog converter 235 at translation frequency.Digital signal processor 222 will control signal to be applied to control
Molding block 233 so that control module 233 programs local oscillator 231, with inclined in order to compensate for the frequency being introduced into baseband signal
It moves, adjusts its rate-adaptive pacemaker.Therefore the output for sending mixer module 230 is to be located at correct carrier frequency.
The selection (and respective opposed translation in local oscillator frequencies) of frequency translation based on baseband signal, it is non-linear
Component includes digital-to-analog converter 235, wave filter 236 and frequency mixer, and mixer module 230 is at the multiple of baseband frequency
Create the frequency product (i.e. intermodulation component) far from specific transmission frequency band.It is understood that the width of high order intermodulation product with
It order of modulation and changes.Requirement is sent in order to meet frequency spectrum, traditional transmitter is amplified using rear power (post-power)
Device is in order to inhibit inessential frequency component (for example, falling into the component of public safety frequency bands).However, the receipts by using Fig. 2
Device is sent out, frequency translation as described above of introducing can allow inessential modulation product to fall into the letter being tolerated closer to it
Road.It is possible to select frequency translation so that all intermodulation products are located at close to the specific region for sending carrier frequency.If its
Power level is sufficiently low, this is not usually problem.
Now as shown in the simplified flowchart of Fig. 3, the low noise amplification in the receiver of optimization wireless telecom equipment is described
The method of device gain.In 301, whether digital signal processor 222 judges transceiver between sending mode and reception pattern
It switches over, if it is, in 302, signal is generated on online 223, with inclined in order to be introduced in differential signal path 224
It moves so that the second order distortion component tolerance in receiver mixer 225 is reduced.In 303, pass through receiving circuit
220, digital signal processor 222 measures total received signal strength.In 304, the value of measurement is compared with preset value, example
Such as, the design point for the receiver not measured for the last time (that is, in the normal operation period) using offset connects
Receive signal strength.Difference using power level measured before and after offset is the measurement of bandwidth interference power.Should not
To be known with the power level of offset, because this is to measure in the normal operation period.In 305, at digital signal
It manages device 222 and generates signal, for the gain of the receiver amplifier in adjustment module 226.If the difference measured is located at design
At point or under design point, then gain is increased.Otherwise gain is lowered.In 306, it will remove what is used in 302
Offset.In transceiver from during sending mode is switched to the period of reception pattern, all steps from 302 to 306 are performed.It will
It is understood that the specific output of only flow is unaffected, thus it is possible to vary the sequence of these steps.It for example, can be in step
Rapid 304 or step 305 before perform step 306.
Now as shown in the simplified flowchart of Fig. 4, the side of the influence for the transmission for reducing the intermodulation component in transmitter is described
Method.In 401, by the action of digital rotary module 234, the digital baseband signal that digital signal processor 222 exports is introduced
On frequency translation.In 402, base band component, i.e. digital-to-analog converter 235, wave filter 236 and amplifier 237, will
To frequency translation digital baseband signal be converted into frequency translation analog signal.In 403, control module 233 adjusts local shake
The frequency of device 231 is swung, with for the frequency translation introduced in compensation process 402.It, will in upward flow path switch in 404
Adjusted local oscillator signals are mixed with frequency translation digital baseband signal, to generate the carrier frequency at specific frequency
Signal.
It will be understood by those skilled in the art that the line of demarcation between function module is only signal, and alternate embodiment can
It either circuit element or the replacement of function is carried out to various functions module or circuit element decomposes with pooling function module.
Thus, it is to be understood that framework described herein is only exemplary, and actually realize identical function it is many its
He can be implemented framework.
It is understood that above-mentioned advantageous effect and advantage can be related to one embodiment or be related to several implementations
Example.Embodiment is not limited to solve the problems, such as any or all of illustrated these or is illustrated with any or all of
Advantageous effect and advantage these.
One or more of these projects are referred to the reference of ' one ' project.Used herein ' include ' mean
Including the method and step or element identified, but these steps and element do not include exclusive list, and a method and dress
Additional step and element can be included by putting.
The step of method described herein, can perform or in appropriate circumstances while hold in any suitable order
Row.Above-mentioned any exemplary various aspects can be combined to be formed into one with any other exemplary aspect of the description
The example of step, without losing desired effect.
It is understood that the foregoing description of preferred embodiment is only presented in an illustrative manner, those skilled in the art
Various modifications can be made.Although with certain specifics or with one or more single embodiments, it has been described that various realities
Example is applied, but those skilled in the art, which can carry out the disclosed embodiments many change, to be made without departing from the scope of the present invention.
Claims (15)
1. a kind of transceiver, which is characterized in that including：
Front-end module has N number of transmitting path and N number of RX path, and wherein N is integer, in transmitting path and RX path
Each include a wave filter；
The passband of wherein each wave filter is selected so that the harmonic wave of multiple inband signalings is filtered out, and N is selected so that described
Total passband of transceiver extends to multiple Radio Access Networks.
2. transceiver as described in claim 1, which is characterized in that at least one wave filter is bandpass filter.
3. transceiver as described in claim 1 or 2, which is characterized in that at least one wave filter is low-pass filter.
4. the transceiver as described in any one of claim 1-3, which is characterized in that the wave filter is LC wave filters.
5. a kind of receiver, which is characterized in that including：
Variable gain amplifier and processor；
Wherein, the processor measures the amplitude of received signal strength, root for second-order distortion to be introduced into the receiver
By one quantity of gain-adjusted of the amplifier and the second-order distortion is removed according to the measured signal strength.
A kind of 6. method for the gain for optimizing amplifier, which is characterized in that in the receiver, this method includes：
Second-order distortion is introduced into the receiver；
Measure the amplitude of received signal strength；
According to the measured signal strength by one quantity of gain-adjusted of amplifier；And
Remove the second-order distortion.
7. the method for the gain of optimization amplifier as claimed in claim 6, which is characterized in that including：
Before the second-order distortion is introduced, the amplitude of received signal strength is measured；
The amplitude of the received signal strength of no measurement for introducing the second-order distortion is introduced into the second-order distortion with having
The amplitude of the received signal strength of measurement is compared；And
According to result of the comparison, the gain of the amplifier is adjusted.
8. the method for the gain of the optimization amplifier as described in claim 6 or 7, which is characterized in that by being connect described in offset
The gain between the positive signal component and negative signal components of differential signal, the second-order distortion in device is received to be introduced into.
9. the method for the gain of the optimization amplifier as described in claim 7 or 8, which is characterized in that if multiple measurements
The amplitude of difference between received signal strength is less than or equal to predetermined threshold value, then the gain is increased.
10. the method for the gain of the optimization amplifier as described in claim 7 or 8, which is characterized in that if multiple measurements
The amplitude of difference between received signal strength is more than predetermined threshold value, then the gain is reduced.
11. the method for the gain of the optimization amplifier as described in any one of claim 6-10, which is characterized in that
The receiver is included in the transceiver of wireless telecom equipment；
During period when the transceiver switches between sending mode and reception pattern, increasing described in initialization offset
Benefit.
12. a kind of transmitter, which is characterized in that including：
Device, for frequency translation to be introduced into digital baseband signal；And
Controller, for adjusting the frequency of local oscillator signals, in order to compensate for the frequency translation.
13. transmitter as claimed in claim 12, which is characterized in that the described device for introducing frequency translation is digital rotation
Turn device, the in-phase component of the digital baseband signal and out-phase component are multiplied by more than time varying signal by the Digital rotator respectively
String component and sinusoidal component, to generate multiple frequency translation digital baseband signals；
The transmitter further includes：
Digital-to-analog converter is simulated for the multiple frequency translation digital baseband signal to be converted into multiple frequency translations
Baseband signal；And
Frequency mixer, for multiple frequency translation analog baseband signals to be mixed with programmable local oscillators signal, with production
Raw special carrier frequency.
14. a kind of method that transmission for reducing intermodulation component influences, which is characterized in that in transmitter, this method includes：
Frequency translation is introduced into digital baseband signal；And
Translation by the local oscillator frequencies for introducing equal and opposite quantity, compensates the frequency translation.
15. the method that the transmission of intermodulation component influences is reduced as claimed in claim 14, which is characterized in that including：
The in-phase component of the digital baseband signal and out-phase component are multiplied by the cosine component of time varying signal and sine point respectively
Amount, to generate multiple frequency translation digital baseband signals；
The multiple frequency translation digital baseband signal is converted into multiple frequency translation analog baseband signals；And
Multiple frequency translation analog baseband signals are mixed with programmable local oscillators signal, to generate specific carriers frequency
Rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911023458.8A CN110971257B (en) | 2015-09-28 | 2016-09-19 | Transceiver device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1517090.5A GB2542625B (en) | 2015-09-28 | 2015-09-28 | Transceiver devices |
| GB1517090.5 | 2015-09-28 | ||
| PCT/CN2016/099333 WO2017054658A1 (en) | 2015-09-28 | 2016-09-19 | Transceiver devices |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911023458.8A Division CN110971257B (en) | 2015-09-28 | 2016-09-19 | Transceiver device |
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| CN108141241A true CN108141241A (en) | 2018-06-08 |
| CN108141241B CN108141241B (en) | 2020-09-11 |
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| CN201680054878.0A Active CN108141241B (en) | 2015-09-28 | 2016-09-19 | Transceiver device |
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| CN (2) | CN110971257B (en) |
| GB (1) | GB2542625B (en) |
| WO (1) | WO2017054658A1 (en) |
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|---|---|---|---|---|
| CN113037315A (en) * | 2019-12-23 | 2021-06-25 | Oppo广东移动通信有限公司 | Antenna module and electronic equipment |
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| US10419063B2 (en) * | 2016-12-30 | 2019-09-17 | Waviot Integrated Systems, Llc | Method and system for receiving telemetry messages over RF channel |
| EP3793148A4 (en) * | 2018-05-31 | 2021-05-19 | Huawei Technologies Co., Ltd. | Radio frequency transmitter and signal processing method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108141241B (en) | 2020-09-11 |
| CN110971257A (en) | 2020-04-07 |
| CN110971257B (en) | 2022-03-25 |
| GB201517090D0 (en) | 2015-11-11 |
| GB2542625A (en) | 2017-03-29 |
| WO2017054658A1 (en) | 2017-04-06 |
| GB2542625B (en) | 2021-06-09 |
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