CN102957905A - Method and device for wireless transmission of high-definition movies - Google Patents
Method and device for wireless transmission of high-definition movies Download PDFInfo
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Abstract
The invention discloses a method and a device for wireless transmission of high-definition movies, which are suitable for transmitting a data packet of a video frame of a high-definition movie. The method comprises the following steps of: receiving the video frame, wherein the video frame has a certain video frame size; obtaining a payload length and a minimum required transmission time related to the video frame, wherein the minimum required transmission time is the shortest time limit for transmitting the video frame to a receiving end; packaging and cutting the video frame according to the payload length to get the data packet; and scheduling the data packet according to the minimum required transmission time, and transmitting the data packet to the receiving end. Even if the wireless condition is worse, the method and the device can meet the delay condition without generating errors of the video frame, and transmit the packet of the video frame with the minimum required transmission time, thereby enabling more users to watch the high-definition movie within limited bandwidth.
Description
Technical field
The present invention relates generally to high image quality (High Definition, HD) film wireless transmission, relate in particular to a kind of in a medium access control layer method and the device of film data package of scheduling and cutting high image quality.
Background technology
High image quality (HD) film refers to have more general image quality (Standard Definition, the film of the resolution (resolution) that SD) film is high, the screen resolution of 1280 * 720 pixels (720pixel, 720p) or 1920 * 1080 pixels (1080i/1080p) for example.High image quality (HD) film wireless transmission is mainly used in playing high definition digital video-audio CD (Digital Video Disc, DVD), Blu-ray Disc (Blue-ray Disc), high image quality Internet Protocol Television top box of digital machine (HD IPTV Set-top box) or high-quality movie projection etc., can solve traditional wire transmission equipment lacks mobility, needs expensive high picture quantity multimedia interface (High Definition Multimedia Interface, HDMI) transmission line and the problem that can't support the one-to-many user.
Using the ratio of digital hd-tv more and more higher at home at present, by high image quality Internet Protocol Television top box of digital machine, a plurality of users can watch the film of high image quality simultaneously on the different digital hd-tv, and exempt the trouble that needs to arrange high picture quantity multimedia interface (HDMI) transmission line.Fig. 1 shows a domestic environment Communication Model 100.Comprise many number of units word hd-tv 102 and one wireless high image quality Internet Protocol Television top box of digital machine 104 in the domestic environment Communication Model 100.Wireless high image quality Internet Protocol Television top box of digital machine 104 can utilize various video pictures forms (video frame format) (such as non-compression or packed data), various antenna technology (such as the single output of single input (SISO) or the technology such as multiple-input and multiple-output (MIMO) and various video pictures compress mode (such as JPEG2000 or mpeg), the high image quality film to be sent to respectively each number of units word hd-tv 102.
In high image quality film wireless transmission, the time that packet error (packet error rate) and each video pictures arrive at receiving terminal (wireless hd-tv 102) can affect watches quality.Wherein, limited frequency range may affect the time that picture error rate (frame error rate) and each video pictures arrive at receiving terminal (wireless hd-tv 102).In the existing high image quality film radio transmitting method, generally use a restriction packet error method and an optimization transmission quantity method to carry out high image quality film wireless transmission.In restriction packet error method, (for example packet error is limited to 10 in order to lower packet error
-2Below), the payload length (payload length) of package is shortened, but increased additional information (overhead information), therefore need the more time to transmit.And in optimization transmission quantity method, the data transmission rate required owing to wireless transmission high image quality film is quite high, in order to improve the effective transmission rating (throughput) within the same time, with the payload length increase of package.Although the average transmission time of optimization transmission quantity method is the shortest, because the payload length of package becomes large, increased packet error.
Summary of the invention
Because the problem of above-mentioned prior art, the invention provides a kind of high image quality film radio transmitting method and device, can ensure under the required quality of high image quality (HD) film, estimate (Minimum Required Transmission Time of the minimum required transmission time, MRTT), and utilize the minimum required transmission time (MRTT) that estimates in medium access control layer (Medium Access Control layer, MAC layer), to do scheduling.
A kind of high image quality film radio transmitting method that an embodiment who discloses according to the present invention provides is applicable to transmit a data packet of a video pictures of a high image quality film.The method comprises the above-mentioned video pictures of reception, and above-mentioned video pictures has a video pictures size; Obtain a payload length relevant with above-mentioned video pictures and a minimum required transmission time, wherein the required transmission time of above-mentioned minimum is the required shortest time limit of above-mentioned video pictures to a receiving terminal of transmission; According to above-mentioned payload length above-mentioned video pictures is carried out package cutting and obtain above-mentioned data packet; And above-mentioned data packet is carried out scheduling according to the required transmission time of above-mentioned minimum, and be sent to above-mentioned receiving terminal.
A kind of high image quality film radio transmitting device that an embodiment who discloses according to the present invention provides is applicable to transmit a data packet of a video pictures of a high image quality film.This device comprises a video source module, in order to receive above-mentioned video pictures; One medium access control control module, in order to obtain a payload length relevant with above-mentioned video pictures and a minimum required transmission time, wherein the required transmission time of above-mentioned minimum is the required shortest time limit of above-mentioned video pictures to a receiving terminal of transmission; Above-mentioned data packet is obtained in order to according to above-mentioned payload length above-mentioned video pictures is carried out package cutting in one enfeoffment unit; And a medium access control scheduler, in order to according to the required transmission time of above-mentioned minimum above-mentioned data packet being carried out scheduling, and export a physical layer to be sent to above-mentioned receiving terminal.
The present invention still can meet the delay condition and not have the mistake of video pictures when radio condition is relatively poor, and uses the minimum required transmission time to transmit the package of video pictures, and can providing more in limited frequency range, the multi-user views and admires the high image quality film.
Description of drawings
Fig. 1 shows a domestic environment Communication Model;
Fig. 2 shows video pictures cutting schematic diagram;
Fig. 3 shows the flow chart according to the described high image quality film of one embodiment of the invention radio transmitting method;
Fig. 4 shows the flow chart according to the described high image quality film of another embodiment of the present invention radio transmitting method;
Fig. 5 shows according to the described high image quality film of one embodiment of the invention radio transmitting device;
Fig. 6 shows according to the described high image quality film of another embodiment of the present invention radio transmitting device;
Fig. 7 showed according to one embodiment of the invention described high image quality film radio transmitting method and prior art in signal to noise ratio required minimum required transmission time simultaneously not.
Wherein, description of reference numerals is as follows:
100～domestic environment Communication Model;
102～digital hd-tv;
104～wireless high image quality Internet Protocol Television top box of digital machine;
200～video pictures cutting schematic diagram
202～video pictures;
204～video pictures cutting cube;
300,400～flow chart;
S302～S310, S402～S418～step;
500,600～high image quality film radio transmitting device;
502,602～video source module;
504,604～medium access control control module;
506,610～enfeoffment unit;
508,612～scheduler;
606～video pictures temporary storage location;
608～transmission performance is improved the unit;
614～transmission and measurement module.
Embodiment
As mentioned above, in high image quality film wireless transmission, the time that packet error (packet error rate) and each video pictures arrive at receiving terminal (for example wireless hd-tv 102) can affect watches quality.Therefore, must be according to instant tunnel condition, do suitable adjustment for the package payload length that institute's tendency to develop is sent, and can when video pictures mistake (video frame error) is arranged, revise by the retransmission mechanism (e.g.I-ACK) in the medium access control layer (MAC layer).High image quality film radio transmitting method provided by the present invention with the device can with the compression after or unpressed high image quality film make wireless transmission at less frequency range, also can use on super wideband (Ultra Wideband, UWB) technology or WiFi (11n) science and technology and use.
In general, the reproduction time of supposing a high image quality film is 120 minutes, and essential the dialling of per minute amplified approximately 30 to 60 video pictures (video frames).Be a target picture error rate (target frame error rate) in order to allow the high image quality film not have the required picture error rate (frame error rate) of video pictures mistake (video frame error) in 120 minutes reproduction time, for example the target picture error rate of a high image quality film of 120 minutes is approximately 10
-6And when having the video pictures mistake to produce, can revise by the retransmission mechanism of medium access control layer.Except this, in order to keep the playback quality of high image quality film, receiving terminal (e.g. is wireless hd-tv 102) is essential can uninterrupted receiver, video picture, therefore each video pictures time of arriving at receiving terminal (for example wireless hd-tv 102) can estimate at transmitting terminal (for example wireless high image quality Internet Protocol Television top box of digital machine 104), and transmitting terminal can arrive at according to video pictures the relevant scheduling of time intercropping of receiving terminal, to avoid the delay of receiving terminal receiver, video picture.High image quality film radio transmitting method provided by the present invention can satisfy a delay condition (delay constraint).The picture transfer rate (frame rate) of supposing this high image quality film wireless transmission is 30 video pictures of per second, and the decoding buffer of receiving terminal (decoder buffer) only can allow temporary video pictures, and this delay condition just equals next video pictures to be sent in per 1/30 second the decoding buffer of receiving terminal.If can't satisfy this delay condition, receiving terminal decoding buffer possibly can't be decoded immediately, and causes video pictures mistake (video frame error).
Fig. 2 shows video pictures cutting signal Figure 200.Video pictures cutting signal Figure 200 comprises a video pictures 202 and a plurality of video pictures cutting cubes 204.As mentioned above, the picture transfer rate of high image quality film wireless transmission can be 30 video pictures of per second, but for example per second transmits 30 video pictures 202.After transmitting terminal (for example wireless high image quality Internet Protocol Television top box of digital machine 104) can be cut into a plurality of video pictures cutting cubes 204 with video pictures 202, be packaged into respectively video pictures cutting cube 204 in the package and be sent to receiving terminal (for example wireless hd-tv 102).
In order to solve the problem of prior art, one embodiment of the invention provides a high image quality film radio transmitting method.This high image quality film radio transmitting method can satisfy the target picture error rate (for example 10 of high image quality film
-6).What specify is, the high image quality film radio transmitting method of one embodiment of the invention has defined (Required Transmission Time of the required transmission time, RTT), this required transmission time (RTT) is time limit that video pictures is required of transmission, and this required transmission time (RTT) can be satisfied target picture error rate (for example 10
-6).High image quality film radio transmitting method of the present invention is except proposing the required transmission time (RTT), and adjust payload length and modulation encoding scheme (the Modulation and Coding Scheme of the package of video pictures for each video pictures (video frames), MCS), thereby obtain (Minimum Required Transmission Time of the minimum required transmission time, MRTT), wherein should be shortest time limit that video pictures is required of transmission the required transmission time of minimum (MRTT).
Fig. 3 shows the flow chart 300 according to the described high image quality film of one embodiment of the invention radio transmitting method.At first, receive a video pictures, this video pictures has a video pictures size (0.5Mb～3Mb) (step S302) for example.Next, obtain a payload length (payload length) and corresponding minimum required transmission time (MRTT), wherein the minimum required transmission time is the required time limit of transmission of video picture (step S304).After obtaining this payload length and corresponding minimum required transmission time, according to this payload length this video pictures is carried out package cutting and obtain the data packet of this video pictures (step S306).At last, the data packet of this video pictures is carried out scheduling according to the required transmission time of this minimum, and be sent to receiving terminal (step S308).
What specify is, the defined minimum of the present invention required transmission time (MRTT) can be as with shown in the following formula one:
Formula one:
And meet the following conditions:
L≥0
Wherein D=video pictures size (bit, bits);
γ
s=signal to noise ratio (signal to noise ratio, SNR);
L=payload length (the bit group, bytes);
M=modulation encoding scheme (MCS);
P
eThe target picture error rate;
T ()=package required time of transmission comprises additional information (overhead);
N
F=one the package quantity that video pictures cuts into;
N
RThe package quantity of=transmission video pictures institute comprises retransmitting partly (retransmission).
Formula two:
P=symbol error rate (symbol error rate) wherein;
R ()=data transmission rate (data rate) (bps);
O
t=additional information (second);
The constant that e=is relevant with the target picture error rate;
The C=constant.
Fig. 4 shows the flow chart 400 according to the described high image quality film of another embodiment of the present invention radio transmitting method.At first, receive a video pictures, this video pictures has a video pictures size (0.5Mb～3Mb) (step S402) for example.What specify is, whether the video pictures of can be first judging this reception according to a delay condition (for example next video pictures must be sent to the decoding buffer of receiving terminal in per 1/30 second) overtime, and when this video pictures overtime, remove above-mentioned video pictures, to transmit next video pictures (step S404).Next, measure a signal to noise ratio (SNR) (step S406).The measurement that must be noted that this signal to noise ratio can be implemented by several different methods.In one embodiment, can just measure signal to noise ratio one time in video pictures of every reception, measure in also can time per unit signal to noise ratio (for example per second once to every n second once).Signal to noise ratio can directly be used to carry out the relevant operation of the temporary wireless transmission of high image quality film, also can be temporary in a storage device for reading use, and storage device can comprise volatibility and/or nonvolatile memory.After obtaining signal to noise ratio, select modulation encoding scheme (MCS) (step S408) according to this signal to noise ratio by a link setup sheet (link adaptation table).For example when signal to noise ratio was better, the modulation encoding scheme of selecting to transmit less redundant bit (redundant bit) was selected when signal to noise ratio is relatively poor to transmit more redundant unit but the lower modulation encoding scheme of transfer rate to improve transfer rate.It is the good table of comparisons of predefined that this link setup sheet can be one, and can directly obtain the good modulation encoding scheme (MCS) of predefined according to this link setup sheet after obtaining signal to noise ratio.
Next, obtain the parameter relevant with this modulation encoding scheme, comprise additional information (O
t(m)), the data transmission rate R (m) relevant with this modulation encoding scheme and constant C (step S410).Obtain symbol error rate (p) (step S412) according to modulation encoding scheme (MCS) and signal to noise ratio (SNR) again.Wherein symbol error rate (p) is in the symbol error rate that does not have under the channel coding (channel coding); Under convolution code (convolutional code), symbol error rate (p) then is one first event error rate (first event error rate).Next, in step S414, utilize Newton method with Fast Convergent characteristic (Newton ' s method) and formula two, obtain a payload length and corresponding minimum required transmission time (MRTT).Wherein, the minimum required transmission time is the required time limit of transmission of video picture, and should the required transmission time of minimum can satisfy the target picture error rate; Payload length is then for can in the required transmission time being sent to video pictures in minimum the package payload length of the decoding buffer of receiving terminal.After obtaining this payload length and corresponding minimum required transmission time, according to this payload length, this video pictures is carried out package cutting (step S416).At last, according to the required transmission time of this minimum, the package of this video pictures is carried out scheduling, export physical layer to be sent to receiving terminal (step S418).
Fig. 5 shows according to the described high image quality film of one embodiment of the invention radio transmitting device 500.Must be noted that at this only to show the element relevant with high image quality film wireless transmission, and the irrelevant element of other and high image quality film wireless transmission running is those of ordinary skills to understand, and does not repeat them here to simplify explanation.Comprise a video source (video stream source) module 502, medium access control control (MAC control) module 504 in the high image quality film radio transmitting device 500.Wherein also comprise an enfeoffment (packetization) unit 506 and a scheduler (scheduler) 508 in the medium access control control module 504.
Fig. 6 shows according to the described high image quality film of another embodiment of the present invention radio transmitting device 600.Must be noted that at this only to show the element relevant with high image quality film wireless transmission, and the irrelevant element of other and high image quality film wireless transmission running is those of ordinary skills to understand, and does not repeat them here to simplify explanation.Comprise a video source (video stream source) module 602, medium access control control (MAC control) module 604 and a transmission and measurement module 614 in the high image quality film radio transmitting device 600.Comprise also in the medium access control control module 604 that wherein a video pictures is kept in (video frame buffer) unit 606, a transmission performance is improved (transmission performance improvement) unit 608, an enfeoffment (packetization) unit 610 and a scheduler (scheduler) 612.Transmission and measurement module 614 can and be measured the operation such as signal to noise ratio (SNR) in order to the package of carrying out wireless transmission high image quality film in the physical layer.Transmission can comprise that with measurement module 614 antenna, wireless simulation fundamental frequency unit, analog-digital converter, modulator, demodulator, encoder, decoder etc. are used for carrying out the related elements of wireless transmission.Transmission can be used for measuring a signal to noise ratio (SNR) with measurement module 614, and wherein the measurement of this signal to noise ratio can be implemented by several different methods.In one embodiment, transmission can receive the control message that comes from medium access control control module 604 with measurement module 614, and just measures signal to noise ratio one time in video pictures of every reception.In another embodiment, transmission and measurement module 614 measure in also can time per unit signal to noise ratio (for example per second once to every n second once).Signal to noise ratio can directly be transferred back to medium access control control module 604 to carry out the relevant operation of the temporary wireless transmission of high image quality film, also can be temporary in a storage device (not shown) and read use for medium access control control module 604, and this storage device can comprise volatibility and/or nonvolatile memory.
Video source module 602 can be in order to the receiver, video picture, for example can read the high image quality video source by high definition digital video-audio CD, Blu-ray Disc or cable TV, and be sent to medium access control control module 604, wherein this video pictures has a video pictures size (0.5Mb～3Mb) for example.Whether the video pictures that the video pictures temporary storage location 606 in the medium access control control module 604 can be first judged this reception according to a delay condition (for example next video pictures must be sent to the decoding buffer of receiving terminal in per 1/30 second) overtime, and when this video pictures overtime, remove above-mentioned video pictures, to transmit next video pictures.Transmission performance is improved the signal to noise ratio (SNR) that unit 608 can be measured according to transmission and measurement module 614, selects modulation encoding scheme (MCS) by a link setup sheet.It is the good table of comparisons of predefined that this link setup sheet can be one, and can directly obtain the good modulation encoding scheme (MCS) of predefined according to this link setup sheet after obtaining signal to noise ratio.Transmission performance is improved unit 608 and can be obtained additional information (O according to signal to noise ratio (SNR) and/or with modulation encoding scheme (MCS)
t(m)), the parameters such as the data transmission rate R (m) relevant with this modulation encoding scheme, constant C and symbol error rate (p), and utilize Newton method with Fast Convergent characteristic (Newton ' s method) and formula two, obtain a payload length and corresponding minimum required transmission time (MRTT).Wherein, the minimum required transmission time is the required time limit of transmission of video picture, and should the required transmission time of minimum can satisfy the target picture error rate; Payload length is then for can in the required transmission time being sent to video pictures in minimum the package payload length of the decoding buffer of receiving terminal.Transmission performance is improved unit 608 can be sent to the payload length that obtains and minimum required transmission time (MRTT) enfeoffment unit 610 and scheduler (scheduler) 612 so that package cutting encapsulation and the scheduling in the access control layer of mediating (MAC layer) to be provided.Wherein enfeoffment unit 610 can improve the payload length that obtains unit 608 according to transmission performance, and video pictures is cut and be encapsulated as package; And scheduler 612 can be done scheduling according to the required transmission time of minimum.Transmission can according to scheduling and the modulation encoding scheme of scheduler 612, be carried out modulation and the coding of physical layer with the package that enfeoffment unit 610 produces, and be sent to receiving terminal with measurement module 614.
Fig. 7 showed according to one embodiment of the invention described high image quality film radio transmitting method and prior art in signal to noise ratio required minimum required transmission time simultaneously not.Wherein the high image quality film radio transmitting method that provides of the embodiment of the invention uses the concept in minimum required transmission time (MRTT), and the method for using in the prior art is as aforesaid restriction packet error method and optimization transmission quantity method.In restriction packet error method, (for example packet error is limited to 10 in order to lower packet error
-2Below), the payload length (payload length) of package is shortened, but increased additional information (overhead information), therefore need the more time to transmit, cause when signal to noise ratio is low and do not meet the delay condition and the situation (MRTT becomes large when signal to noise ratio is low) of lost data package.Restriction packet error method is not meeting under the delay condition, causes receiving terminal decoding buffer immediately to decode, and produces the video pictures mistake.And in optimization transmission quantity method, the data transmission rate required owing to wireless transmission high image quality film is quite high, in order to improve the effective transmission rating (throughput) within the same time, with the payload length increase of package.Although the average transmission time of optimization transmission quantity method is the shortest, because the payload length of package becomes large, increased packet error, cause equally not meet the delay condition and the situation of lost data package, and produce the video pictures mistake.The high image quality film radio transmitting method that the embodiment of the invention provides can satisfy the target picture error rate (for example 10 of high image quality film
-6).The embodiment of the invention has also defined the required transmission time (RTT), and this required transmission time (RTT) is time limit that video pictures is required of transmission, and this required transmission time (RTT) can be satisfied target picture error rate (for example 10
-6).Adjust payload length and the modulation encoding scheme of the package of video pictures for each video pictures (video frames), thereby obtain the minimum required transmission time (MRTT), utilize the required transmission time of resulting minimum to carry out package cutting and scheduling.As shown in Figure 7, the embodiment of the invention has successfully overcome the restriction of prior art, when radio condition is relatively poor, still can meet the delay condition and do not have the mistake of video pictures, and use the minimum required transmission time to transmit the package of video pictures, can providing more in limited frequency range, the multi-user views and admires the high image quality film.
Above paragraph uses multiple aspect to describe.Obvious, the teaching of this paper may be implemented in a variety of ways, and any certain architectures that discloses in example or function only are a representational situation.According to the teaching of this paper, any those of ordinary skills should understand each aspect of disclosing at this paper can independent implementation or two or more aspects can merge implementation.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention; any those of ordinary skills; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the scope that claim defines.
Claims (14)
1. high image quality film radio transmitting method is applicable to transmit a data packet of a video pictures of a high image quality film, comprising:
Receive above-mentioned video pictures;
Obtain a payload length relevant with above-mentioned video pictures and a minimum required transmission time, wherein the required transmission time of above-mentioned minimum is the required shortest time limit of above-mentioned video pictures to a receiving terminal of transmission;
According to above-mentioned payload length above-mentioned video pictures is carried out package cutting and obtain above-mentioned data packet; And
Above-mentioned data packet is carried out scheduling according to the required transmission time of above-mentioned minimum, and be sent to above-mentioned receiving terminal.
2. high image quality film radio transmitting method as claimed in claim 1, wherein above-mentioned video pictures has a video pictures size, and obtains the step in above-mentioned required transmission time of minimum and comprise:
According to above-mentioned video pictures size and a signal to noise ratio, adjust above-mentioned payload length and a modulation encoding scheme.
3. high image quality film radio transmitting method as claimed in claim 2, wherein above-mentioned modulation encoding scheme is according to above-mentioned signal to noise ratio, is obtained by comparison list.
4. high image quality film radio transmitting method as claimed in claim 3, wherein the required transmission time of above-mentioned minimum is shortest time limit that video pictures is required of transmission, and the required transmission time of above-mentioned minimum is satisfied a target picture error rate, and wherein above-mentioned target picture error rate is not produce the required picture error rate of a video pictures mistake when playing above-mentioned high image quality film.
5. high image quality film radio transmitting method as claimed in claim 4 also comprises:
Obtain required transmission time of above-mentioned minimum and above-mentioned payload length according to following formula, wherein D is above-mentioned video pictures size, and L is above-mentioned payload length, e is the function of above-mentioned target picture error rate, and p is a symbol error rate, and C is a constant, R (m) is a transmission rate, and O
t(m) be an additional information.
6. high image quality film radio transmitting method as claimed in claim 5, wherein above-mentioned symbol error rate obtains according to above-mentioned signal to noise ratio and above-mentioned modulation encoding scheme.
7. high image quality film radio transmitting method as claimed in claim 1 also comprises:
Postpone whether overtime of the above-mentioned video pictures of condition judgment according to one; And
When above-mentioned video pictures overtime, remove above-mentioned video pictures.
8. high image quality film radio transmitting device is applicable to transmit a data packet of a video pictures of a high image quality film, comprising:
One video source module is in order to receive above-mentioned video pictures;
One medium access control control module, in order to obtain a payload length relevant with above-mentioned video pictures and a minimum required transmission time, wherein the required transmission time of above-mentioned minimum is the required shortest time limit of above-mentioned video pictures to a receiving terminal of transmission;
Above-mentioned data packet is obtained in order to according to above-mentioned payload length above-mentioned video pictures is carried out package cutting in one enfeoffment unit; And
One medium access control scheduler in order to according to the required transmission time of above-mentioned minimum above-mentioned data packet being carried out scheduling, and exports a physical layer to be sent to above-mentioned receiving terminal.
9. high image quality film radio transmitting device as claimed in claim 8, wherein above-mentioned video pictures has a video pictures size, and above-mentioned medium access control control module obtains the required transmission time of above-mentioned minimum and comprises according to above-mentioned video pictures size and a signal to noise ratio, adjusts above-mentioned payload length and a modulation encoding scheme.
10. high image quality film radio transmitting device as claimed in claim 9, wherein above-mentioned medium access control control module obtains above-mentioned modulation encoding scheme according to above-mentioned signal to noise ratio by comparison list.
11. high image quality film radio transmitting device as claimed in claim 10, wherein the required transmission time of above-mentioned minimum is shortest time limit that video pictures is required of transmission, and the required transmission time of above-mentioned minimum is satisfied a target picture error rate, and wherein above-mentioned target picture error rate is not produce the required picture error rate of a video pictures mistake when playing above-mentioned high image quality film.
12. high image quality film radio transmitting device as claimed in claim 11, wherein above-mentioned medium access control control module also obtains required transmission time of above-mentioned minimum and above-mentioned payload length according to following formula, wherein D is above-mentioned video pictures size, L is above-mentioned payload length, e is the function of above-mentioned target picture error rate, and p is a symbol error rate, and C is a constant, R (m) is a transmission rate, and O
t(m) be an additional information.
13. high image quality film radio transmitting device as claimed in claim 12, wherein above-mentioned symbol error rate obtains according to above-mentioned signal to noise ratio and above-mentioned modulation encoding scheme.
14. high image quality film radio transmitting device as claimed in claim 8 also comprises:
One video pictures temporary storage location in order to postponing whether overtime of the above-mentioned video pictures of condition judgment according to one, and when above-mentioned video pictures overtime, removes above-mentioned video pictures.
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| CN116321289A (en) * | 2023-02-22 | 2023-06-23 | 祝晓鹏 | Wireless transmission data packet length conversion system |
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| KRISHMAMACHARI: "Adaptive cross-layer protection strategies for robust scalable video transmission over 802.11 wlans", 《IEEE》 * |
| TUNG-YU WU: "Optimal transmission of high definition video transmission in WiMedia systems", 《WIRELESS NETWORKS》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809669A (en) * | 2017-11-01 | 2018-03-16 | 五华薪火科技发展有限公司 | A kind of high image quality film radio transmitting method |
| CN116321289A (en) * | 2023-02-22 | 2023-06-23 | 祝晓鹏 | Wireless transmission data packet length conversion system |
| CN116321289B (en) * | 2023-02-22 | 2023-10-17 | 北纬实捌(海口)科技有限公司 | Wireless transmission data packet length conversion system |
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| CN102957905B (en) | 2016-08-31 |
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