CN101895894B - Method for selecting working channel of dynamic spectrum shared wireless communication system and device thereof - Google Patents
Method for selecting working channel of dynamic spectrum shared wireless communication system and device thereof Download PDFInfo
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- CN101895894B CN101895894B CN 201010233009 CN201010233009A CN101895894B CN 101895894 B CN101895894 B CN 101895894B CN 201010233009 CN201010233009 CN 201010233009 CN 201010233009 A CN201010233009 A CN 201010233009A CN 101895894 B CN101895894 B CN 101895894B
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Abstract
The invention discloses a method for selecting a working channel of a dynamic spectrum shared wireless communication system and a device thereof. The method comprises the following steps of: performing spectrum analysis on a plurality of detected strong interference signals of spectrum holders in a specific wireless communication working band by adopting a signal spectrum analysis device, then designing an intermediate frequency fIF of a radio-frequency receiver and a working bandwidth Bw of the specific wireless communication system to satisfy that the fIF is more than 2Bw according to the analysis result of the signal spectrum analysis device, and selecting the proper system working channel from idle channels in the working band of the wireless communication system. The device comprises a strong interference signal frequency detection device, the signal spectrum analysis device and a working channel selecting device. Therefore, the method and the device assist the dynamic spectrum shared wireless communication system in selecting the proper working channel based on the front-end technology of the radio-frequency receiver so as to reduce the interference to the communication system and ensure the communication quality.
Description
Technical field
The present invention relates to a kind of system of selection and device thereof of working channel of dynamic spectrum shared wireless communication system, belong to radio circuit, radio circuit system and wireless communication field.
Background technology
Along with The development in society and economy, demand to radio communication constantly increases, it is more in short supply originally that frequency spectrum resource becomes, original fixed frequency spectrum method of salary distribution can not satisfy various application to the demand of frequency spectrum resource, this just requires to insert new application under the prerequisite that on the working frequency range frequency spectrum resource holder is not exerted an influence, thereby the raising availability of frequency spectrum, i.e. dynamic spectrum resource-sharing.To under existing subscriber's prerequisite, insert dynamic spectrum common share communication system user, must consider that then the original system signal is to the interference of dynamic spectrum sharing system.In dynamic spectrum shared wireless communication system, when having strong frequency spectrum holder signal in the occupied channel, select different idle channels as the working channel of system, strong frequency spectrum holder signal disturbs the influence of system communication quality also different.Therefore, selecting an appropriate idle channel will be very important as the working channel of dynamic spectrum shared wireless communication system.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of system of selection of working channel of dynamic spectrum shared wireless communication system is provided, it is based on the radio-frequency receiver front-end technology, help dynamic spectrum shared wireless communication system to select appropriate working channel, reduce the suffered interference of communication system, ensure communication quality.
For realizing above technical purpose, the present invention will take following technical scheme: a kind of system of selection of working channel of dynamic spectrum shared wireless communication system, may further comprise the steps: (1) frequency spectrum holder high reject signal frequency detecting detects frequency spectrum holder centre frequency and is respectively f in the certain wireless communication systems working band
R1, f
R2... f
RkK high reject signal, wherein, k＜n, n are the total number of channels in this certain wireless communication systems working band; (2) spectrum analysis of frequency spectrum holder high reject signal is handled for the frequency spectrum holder centre frequency that obtains in the step (1) and is respectively f
R1, f
R2... f
RkK high reject signal, adopt the signal spectral analysis processing unit to calculate its third order intermodulation signal and other corresponding third order intermodulation components respectively, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate the frequency of k (k-1)/2 pair third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate other third order intermodulation components, by the calculating of signal spectral analysis processing unit, total k (k-1)/2 pair third order intermodulation signal, and each frequency to the third order intermodulation signal is: 2f
Ri-f
RjAnd 2f
Rj-f
Ri, also have simultaneously
Individual by three the different third order intermodulation component that disturbs the signal frequency combination: f
Rq+ f
Rp-f
Rt(3) working channel frequency f
sSelectional restriction if the IF-FRE f of radio-frequency transmitter
IFAnd described certain wireless communication systems frequency spectrums of operation bandwidth B
wSatisfy f
IF＞2B
wThe time, according to formula:
f
s≠2f
ri-f
rj (i≤k，j≤k，i≠j)
f
s≠f
rq+f
rp-f
rt (q≤k，p≤k，t≤k，q≠p≠t)
Be chosen in an interior idle channel of aforementioned certain wireless communication systems working band as system works channel f
s
Another technical purpose of the present invention provides a kind of choice device of working channel of dynamic spectrum shared wireless communication system, comprise the high reject signal frequency detecting device for detection of frequency spectrum holder high reject signal in the certain wireless communication systems frequency spectrums of operation, be used for calculating the signal spectral analysis processing unit of high reject signal frequency third order intermodulation signal and other third order intermodulation components of detecting and be used for the working channel choice device that the described specific wireless communication work frequency band idle channel of eliminating is subjected to the part of serious interference, described high reject signal frequency detecting device detects centre frequency altogether and is respectively f
R1, f
R2... f
RkK high reject signal, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate every pair of third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate other third order intermodulation components, in addition, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate every pair of third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate other third order intermodulation components, in addition, described working channel choice device is based on formula
f
s≠2f
ri-f
rj (i≤k，j≤k，i≠j)
f
s≠f
rq+f
rp-f
rt (q≤k，p≤k，t≤k，q≠p≠t)
Eliminating is subjected to the part of serious interference in specific wireless communication work frequency band idle channel, to carry out working channel f in the idle channel of remainder
sSelection, wherein, k＜n, n are the total number of channels in this certain wireless communication systems working band.
According to above technical scheme, can realize following beneficial effect:
1. in the existing wireless communications system, employing all be the fixed frequency spectrum allocation model, do not have mutual interference problem, it all is to carry out earlier in glitch-free prerequisite that channel is selected.The present invention from the angle analysis of radio-frequency receiver front-end the system of selection of system works channel under the situation that exists a plurality of strong signals to disturb, thereby ensure communication quality when having disturbed condition.
2. the factor of Radio Frequency Subsystem is considered in general communication system working channel choice hardly, the inevitable nonlinear characteristic with radio-frequency receiver front-end of the invention is introduced among the channel choice factor, selects more rational working channel for communication system foundation is provided.
3. signal working channel selecting method provided by the present invention is simple, easy to use, practical, can be generalized among other wireless communication systems that have high reject signal.
Description of drawings
Fig. 1 is the signal spectrum that enters radio-frequency receiver front-end when having a plurality of high reject signal;
Fig. 2 is the schematic diagram of radio-frequency receiver front-end structure commonly used;
Fig. 3 is the Radio Frequency Subsystem that works in the dynamic spectrum shared wireless communication system of uhf band;
Fig. 4 has showed that centre frequency is the receiver EVM test result of channel when not having interference of 722MHz;
Fig. 5 has showed that centre frequency is the channel of the 722MHz receiver EVM test result when exist disturbing;
Fig. 6 is emulation schematic diagram when having three high reject signals;
Fig. 7 is the EVM test result when having strong jamming.
Embodiment
Accompanying drawing discloses the structural representation of embodiment involved in the present invention without limitation, explains technical scheme of the present invention below with reference to accompanying drawing.
As shown in Figure 1, it is to enter one of signal spectrum situation of radio-frequency front-end, wherein f when having a plurality of high reject signal
sExpression system signal frequency, f
R1, f
R2... f
RkRepresent the k (frequency of individual high reject signal of k＜n) respectively.
As shown in Figure 2, it is a kind of radio-frequency receiver front-end structure commonly used that can be used for dynamic spectrum common share communication system.In this structure, at first carry out working band filtering from the radiofrequency signal that antenna receives, enter low noise amplifier then and amplify, carry out frequency-conversion processing finally by entering frequency mixer after the image-reject filter filtering.
The system of selection of dynamic spectrum shared wireless communication system channel of the present invention may further comprise the steps: (1) frequency spectrum holder high reject signal frequency detecting detects frequency spectrum holder centre frequency and is respectively f in specific wireless communication work frequency spectrum
R1, f
R2... f
RkK high reject signal, wherein, k＜n, n are the total number of channels in this specific wireless communication work frequency spectrum; (2) k the high reject signal frequency that obtains in the step (1) handled in the spectrum analysis of frequency spectrum holder high reject signal, adopt the signal spectral analysis processing unit to calculate its third order intermodulation signal and other third order intermodulation components respectively, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate every pair of third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate three different third order intermodulation components that disturb the signal frequency combination.By the calculating of signal spectral analysis processing unit, total k (k-1)/2 pair third order intermodulation signal, and each frequency to the third order intermodulation signal is: 2f
Ri-f
RjAnd 2f
Rj-f
Ri, also have simultaneously
Individual by three the different third order intermodulation component that disturbs the signal frequency combination: f
Rq+ f
Rp-f
Rt, wherein, i≤k, j≤k, i ≠ j, and q, p, t are any three different numbers in 1 to k,
Expression k 〉=3 o'clock, by the number of the newborn signal that produces after any three unlike signal first-harmonics intermodulation in this k high reject signal, C is the expression symbol of combinatorial operation; (3) working channel frequency f
sSelectional restriction if the IF-FRE f of radio-frequency transmitter
IFAnd this specific wireless communication work spectral bandwidth B
wSatisfy f
IF＞2B
wThe time, according to formula:
f
s≠2f
ri-f
rj (i≤k，j≤k，i≠j)
f
s≠f
rq+f
rp-f
rt (q≤k，p≤k，t≤k，q≠p≠t)
Be chosen in an interior idle channel of certain wireless communication systems working band as the system works channel.
The choice device of dynamic spectrum shared wireless communication system channel of the present invention, comprise that described spectrum signal APU is based on algebraic expression 2f for detection of the high reject signal frequency detecting device of frequency spectrum holder high reject signal sum k in the specific wireless communication work frequency spectrum, for the signal spectral analysis processing unit that calculates high reject signal frequency third order intermodulation signal and other third order intermodulation components of detecting and for getting rid of the working channel choice device that described specific wireless communication work frequency band idle channel is subjected to the part of serious interference
Ri-f
RjAnd 2f
Rj-f
RiCalculate every pair of third order intermodulation signal, this spectrum signal APU is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate other third order intermodulation components, in addition, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate every pair of third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate other third order intermodulation components.In addition, described working channel choice device is based on formula
f
s≠2f
ri-f
rj (i≤k，j≤k，i≠j)
f
s≠f
rq+f
rp-f
rt (q≤k，p≤k，t≤k，q≠p≠t)
Eliminating is subjected to the part of serious interference in specific wireless communication work frequency band idle channel, and selects suitable working channel, and wherein, k＜n, n are the total number of channels in this specific wireless communication work frequency band.
For the restrictive condition that illustrates that communication system working channel of the present invention is selected, be that example describes with a dynamic spectrum common share communication system that works in uhf band, this frequency range has been distributed to radio data system regularly, and in the system each terminal Radio Frequency Subsystem as shown in Figure 3.The system works frequency range is 694MHz～806MHz, and bandwidth is 112MHz, comprises 36～49 channels of radio and television, has 14 channels altogether, and each channel bandwidth is 8MHz.This Radio Frequency Subsystem comprises a perception receiver and three data transceivers, can realize the data transmission channel of three 8MHz continuous or that separate simultaneously.System adopts the TDD mode of operation, and radio-frequency transmitter adopts high local oscillator down-conversion mode to carry out frequency conversion simultaneously.Receiver adopts the double conversion structure, and first intermediate frequency is chosen as 250MHz, satisfies condition: 250MHz＞224MHz (f
IF＞2B
w).
Because the strong cohesiveness of a lot of wireless communication systems is subjected to signal between between-30dBm and the-25dBm, so to be defined in the intensity that receives in the dynamic spectrum shared wireless communication system be high reject signal greater than the frequency spectrum holder signal of-25dBm.The system works frequency range is 694MHz～806MHz, signal outside this frequency range can be mirrored the rejects trap filtering, when existing two stronger centre frequencies to be respectively the broadcast television signal of 746MHz and 770MHz in the system, according to select equation as can be known the system works channel can not select to comprise two idle channels that frequency is 722MHz and 794MHz.
There are two stronger broadcast television signals in the initialization system, two interference signal intensity are all-20dBm, system signal intensity is-50dBm, and the frequency of interference signal is respectively 746MHz and 770MHz, and the signal of the centre frequency 722MHz bandwidth 8MHz that system signal is.Adopt Agilent 89600 vector signal analysis software that radio-frequency transmitter EVM is tested, what interference signal adopted is tone signal, and system signal is the ofdm signal of QPSK modulation, and the EVM by test receiver illustrates that interference is to the influence of communication quality.Fig. 4, Fig. 5 have showed that respectively centre frequency is the receiver EVM test result of channel when not having interference and having interference of 722MHz.As can be known when these two interference signals exist, centre frequency is that the communication quality on the channel of 722MHz has been subjected to great influence from this two figure, and the EVM test result is by not having 0.65% when disturbing to become to disturb 161.0% when existing.Simultaneously, shown in the table one for all the other channels except the channel at interference signal place respectively at the EVM test result that exists when not having these two interference signals, f
0The centre frequency of representing each channel.As can be seen from the table, when having interference, all channels all can be subjected to some influences, but except centre frequency is the channel of 722MHz and 794MHz, the suffered influence of all the other channels is all smaller, and these two channels have been subjected to very big influence, and EVM has all surpassed 160%, will have a strong impact on communication quality.When interference exists, select two channel EVM that constraints obtains all greater than 160% by channel, and the EVM of all the other channels is all less than 1.4%, therefore, in this case, need avoid two idle channels that centre frequency is 722MHz and 794MHz when system channel is selected, necessity and validity that channel is selected the correctness of constraints and analyze channel selection constraints from radio-frequency receiver front-end in dynamic spectrum common share communication system have been described.
The EVM of all the other channels of table one except the channel at interference signal place
There are three high reject signals
When existing three bigger centre frequencies, system is respectively 714MHz, during the broadcast television signal of 746MHz and 802MHz, then selecting constraints can obtain the inoperable frequency of system by channel has: 626MHz, 658MHz, 682MHz, 690MHz, 770MHz, 778MHz, 834MHz, 858MHz and 890MHz.Because the system works frequency range is 694MHz～806MHz, and the signal outside this frequency range can be mirrored the rejects trap filtering.Therefore, the system works channel can not select to comprise the channel that frequency is 778MHz and 770MHz in this case.
Be the correctness of check analysis, adopted ADS software that this situation has been carried out the single-tone simulation analysis.Suppose that three interference signal intensity that radio-frequency transmitter receives are all-20dBm, system signal intensity is-50dBm, and the frequency of interference signal is respectively 714MHz, 746MHz and 802MHz, and the frequency of system signal is 772MHz.Then the emulation schematic diagram of ADS and simulation result are respectively as shown in Figure 6 and Figure 7.Learn from Fig. 6 and Fig. 7, be the intermediate frequency place of 8MHz in frequency centered by 250MHz, bandwidth, the signal strength signal intensity that is obtained by system signal is-29.7dBm, and the signal strength signal intensity that is obtained by interference signal is-29.1dBm, interference will have a strong impact on system communication quality, illustrate that this channel is unavailable.
Claims (2)
1. the system of selection of a working channel of dynamic spectrum shared wireless communication system is characterized in that, may further comprise the steps:
(1) frequency spectrum holder high reject signal frequency detecting detects frequency spectrum holder centre frequency and is respectively f in the certain wireless communication systems working band
R1, f
R2... f
RkK high reject signal, wherein, k＜n, n are the total number of channels in this certain wireless communication systems working band;
(2) spectrum analysis of frequency spectrum holder high reject signal is handled for the frequency spectrum holder centre frequency that obtains in the step (1) and is respectively f
R1, f
R2... f
RkK high reject signal, adopt the signal spectral analysis processing unit to calculate its third order intermodulation signal and other corresponding third order intermodulation components respectively, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate the frequency of k (k-1)/2 pair third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate other third order intermodulation components, by the calculating of signal spectral analysis processing unit, total k (k-1)/2 pair third order intermodulation signal, and each frequency to the third order intermodulation signal is: 2f
Ri-f
RjAnd 2f
Rj-f
Ri, also have C simultaneously
k 2C
K-2 1Individual by three the different third order intermodulation component that disturbs the signal frequency combination: f
Rq+ f
Rp-f
Rt
(3) working channel frequency f
sSelectional restriction if the IF-FRE f of radio-frequency transmitter
IFAnd described certain wireless communication systems frequency spectrums of operation bandwidth B
wSatisfy f
IF＞2B
wThe time, according to formula:
f
s≠2f
ri-f
rj (i≤k，j≤k，i≠j)
f
s≠f
rq+f
rp-f
rt (q≤k，p≤k，t≤k，q≠p≠t)
Be chosen in an interior idle channel of aforementioned certain wireless communication systems working band as system works channel f
s
2. the choice device of a working channel of dynamic spectrum shared wireless communication system, it is characterized in that: comprise the high reject signal frequency detecting device for detection of frequency spectrum holder high reject signal in the certain wireless communication systems frequency spectrums of operation, be used for calculating the signal spectral analysis processing unit of high reject signal frequency third order intermodulation signal and other third order intermodulation components of detecting and be used for the working channel choice device that the described specific wireless communication work frequency band idle channel of eliminating is subjected to the part of serious interference, described high reject signal frequency detecting device detects centre frequency altogether and is respectively f
R1, f
R2... f
RkK high reject signal, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate every pair of third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp+ f
RtCalculate other third order intermodulation components, in addition, described signal spectral analysis processing unit is based on algebraic expression 2f
Ri-f
RjAnd 2f
Rj-f
RiCalculate every pair of third order intermodulation signal, this signal spectral analysis processing unit is based on algebraic expression f simultaneously
Rq+ f
Rp-f
RtCalculate other third order intermodulation components, in addition, described working channel choice device is based on formula
f
s≠2f
ri-f
rj (i≤k，j≤k，i≠j)
f
s≠f
rq+f
rp-f
rt (q≤k，p≤k，t≤k，q≠p≠t)
Eliminating is subjected to the part of serious interference in specific wireless communication work frequency band idle channel, to carry out working channel f in the idle channel of remainder
sSelection, wherein, k＜n, n are the total number of channels in this certain wireless communication systems working band.
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| CN102185619B (en) * | 2011-04-22 | 2014-04-16 | 东南大学 | Anti-interference RF (radio frequency) reconfigurable transceiver |
| CN102291496B (en) | 2011-09-06 | 2013-08-07 | 华为终端有限公司 | Talking method of terminal and terminal using talking method |
| CN109302748B (en) * | 2018-11-15 | 2023-05-12 | 上海道生物联技术有限公司 | Frequency selection method and communication method of wireless communication system |
| CN113050041B (en) * | 2019-12-27 | 2024-03-26 | 华为技术有限公司 | Method for judging state of frequency band and related equipment |
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| EP1453211A2 (en) * | 2003-02-27 | 2004-09-01 | NTT DoCoMo, Inc. | Radio communication system, radio station, and radio communication method |
| CN1592124A (en) * | 2003-09-01 | 2005-03-09 | Gcomm株式会社 | Spread spectrum communication mode receiving device |
| CN1925338A (en) * | 2003-02-27 | 2007-03-07 | 株式会社Ntt都科摩 | Radio communication system, radio station, and radio communication method |
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| EP1453211A2 (en) * | 2003-02-27 | 2004-09-01 | NTT DoCoMo, Inc. | Radio communication system, radio station, and radio communication method |
| CN1925338A (en) * | 2003-02-27 | 2007-03-07 | 株式会社Ntt都科摩 | Radio communication system, radio station, and radio communication method |
| CN1592124A (en) * | 2003-09-01 | 2005-03-09 | Gcomm株式会社 | Spread spectrum communication mode receiving device |
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