CN101442382A - Method for determining modulation encoded mode of rapid feedback channel - Google Patents
Method for determining modulation encoded mode of rapid feedback channel Download PDFInfo
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- CN101442382A CN101442382A CNA2007101873611A CN200710187361A CN101442382A CN 101442382 A CN101442382 A CN 101442382A CN A2007101873611 A CNA2007101873611 A CN A2007101873611A CN 200710187361 A CN200710187361 A CN 200710187361A CN 101442382 A CN101442382 A CN 101442382A
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Abstract
The invention relates to a method for determining a coding modulation mode in a rapid feedback channel. The method comprises the following steps: according to a current signal channel condition, a terminal (1) selects a coding modulation mode supported by the terminal (1) and a base station; the terminal converts the coding modulation mode into a feedback code; the feedback code is sent to the base station through the rapid feedback channel; and the base station (2) receives the feedback code and determines the corresponding coding modulation mode according to the feedback code. In the method, the terminal directly selects the coding modulation mode supported by the terminal and the base station according to the current channel condition, thereby avoiding that the prior art sorts the coding modulation mode and negotiates for multiple times; therefore, the method is simple and feasible; and the terminal can also flexibly and accurately feed back the needed coding modulation mode.
Description
Technical field
The present invention relates to broadband wireless OFDM access net system, be specifically related in a kind of broadband wireless OFDM access net system modulation encoded mode of rapid feedback channel and determine method.
Background technology
(1) OFDM (Orthogonal Frequency Division Multiplexing is called for short OFDM) is a kind of special multi-carrier transmission scheme, and it can be counted as a kind of modulation technique, also can be taken as a kind of multiplex technique.Its basic principle is exactly that data flow is at a high speed passed through serial to parallel conversion, is assigned in the relatively low experimental process channel of transmission rate and transmits, and can improve spectrum efficiency greatly.
In the 802.16e agreement, the modulation coding mode that terminal needs downlink data to use can be understood by distributing fast feedback channel in the base station; Fast feedback channel (Fast Feedback Channel) is a up zone of marking specially, and the modulation system of employing is quaternary PSK (QPSK), and terminal can be fed back the information that some base stations need on fast feedback channel.
The modulation coding mode of data is burst attribute (Burst Profile) again in the 802.16e agreement, it comprises two aspects: modulation system and coded system.Modulation system has: quaternary PSK, code check is that 1/2 (QPSK 1/2, Quadrature Phase-Shift Keying), 16 dot matrix quadrature amplitude modulation, code check is 3/4 (16QAM3/4, Quadrature Amplitude Modulation), 64 dot matrix quadrature amplitude modulation, code check is 5/6 (64QAM5/6, Quadrature Amplitude Modulation) etc., if coded system is QPSK 1/2, can also be divided into: QPSK 1/2 repetition 6 times, QPSK 1/2 repetition 4 times, QPSK 1/2 repetition 2 times and QPSK 1/2 do not repeat four kinds of situations.Modulation system (is the forward error correction code type again, FECCode type) has: volume collection sign indicating number (CC, Convolutional Code), volume collection Turbo code (CTC, Convolutional Turbo Code), grouping Turbo code (BTC, Block Turbo Code), tail zero convolution code (ZT CC, Zero Tail Convolutional Code) etc.In the 802.16e agreement, defined a variety of modulation coding modes, as table 1:
| Title | Value |
| FEC?Code type?and modulation type | 0＝QPSK(CC)1/2 1＝QPSK(CC)3/4 2＝16-QAM(CC)1/2 3＝16-QAM(CC)3/4 4＝64-QAM(CC)1/2 5＝64-QAM(CC)2/3 6＝64-QAM(CC)3/4 7＝QPSK(BTC)1/2 8＝QPSK(BTC)3/4or2/3 9＝16-QAM(BTC)3/5 10＝16-QAM(BTC)4/5 11＝64-QAM(BTC)2/3or5/8 12＝64-QAM(BTC)5/6or4/5 13＝QPSK(CTC)1/2 14＝Reserved 15＝QPSK(CTC)3/4 16＝16-QAM(CTC)1/2 17＝16-QAM(CTC)3/4 18＝64-QAM(CTC)1/2 19＝64-QAM(CTC)2/3 20＝64-QAM(CTC)3/4 21＝64-QAM(CTC)5/6 22＝QPSK(ZT?CC)1/2 23＝QPSK(ZT?CC)3/4 24＝16-QAM(ZT?CC)1/2 25＝16-QAM(ZT?CC)3/4 26＝64-QAM(ZT?CC)1/2 |
| 27＝64-QAM(ZT?CC)2/3 28＝64-QAM(ZT?CC)3/4 29＝QPSK(LDPC)1/2 30＝QPSK(LDPC)2/3?A?code 31＝QPSK(LDPC)3/4?A?code 32＝16-QAM(LDPC)1/2 33＝16-QAM(LDPC)2/3?A?code 34＝16-QAM(LDPC)3/4?A?code 35＝64-QAM(LDPC)1/2 36＝64-QAM(LDPC)2/3?A?code 37＝64-QAM(LDPC)3/4?A?code 38＝QPSK(LDPC)2/3?B?code 39＝QPSK(LDPC)3/4?B?code 40＝16-QAM(LDPC)2/3?B?code 41＝16-QAM(LDPC)3/4?B?code 42＝64-QAM(LDPC)2/3?B?code 43＝64-QAM(LDPC)3/4?B?code 44＝QPSK(CC?with?optional?interleaver)1/2 45＝QPSK(CC?withoptional?interleaver)3/4 46＝16-QAM(CC?with?optional?interleaver)1/2 47＝16-QAM(CC?with?optional?interleaver)3/4 48＝64-QAM(CC?with?optional?interleaver)2/3 49＝64-QAM(CC?with?optional?interleaver)3/4 50＝QPSK(LDPC)5/6 51＝16-QAM(LDPC)5/6 52＝64-QAM(LDPC)5/6 53...255＝Reserved |
The modulation coding mode of supporting among table 1 802.16e
(2) part is picked out as the type of oneself supporting in the base station from numerous modulation coding modes, at least a, maximum 13 kinds, the corresponding downlink interval of each modulation coding mode is used sign indicating number (DIUC:Downlink Interval Usage Code), referring to table 2.DIUC=0～12 respectively corresponding 13 kinds of different modulation coding modes, just Burst Profile.The base station is regularly described (DCD, Downlink Channel Descriptor) message by down channel the DIUC table of the modulation coding mode correspondence supported is sent to terminal.
As terminal transmitting capacity request message (SBC-REQ, SS Basic Capability Requestmessage) and base station recovery capacity response message (SBC-RSP, SS Basic Capability Responsemessage) afterwards, base station and terminal have just been finished capability negotiation, and the part about coded system in the capability negotiation is seen Fig. 1.After the capability negotiation, terminal is just known the coded system that can adopt.Terminal is chosen the Burst Profile that oneself supports according to the ability of oneself from the modulation coding mode that the base station is supported, select different Burst Profile according to the quality of current down channel.
When the base station assigns fast feedback channel is given terminal, when indicating terminal feeds back effective carrier-in-interference noise ratio (Effective CINR), terminal is just according to current CINR, and the modulating-coding ability of oneself supporting (promptly in table 2) from the modulation coding mode that the base station is supported is picked out suitable modulation coding mode, again the modulation system in the select modulation coding mode is converted to the feedback code of quick feedback corresponding in the table 3, the feedback code after the conversion is sent to the base station by fast feedback channel.The feedback code of terminal is received in the base station on fast feedback channel, table look-up 3 earlier, convert feedback code to modulation system, again according to the base station therewith the result of terminal capability negotiation determine the coded system that terminal is used, if in the time of capability negotiation the negotiation of success coded system, that first coded system of successfully consulting is exactly the selected coded system of terminal, if successfully do not consult coded system, that coded system of forcing to use is exactly the selected coded system of terminal.Having determined just can table look-up 2 after the modulation system of terminal to report and the coded system in the base station, obtains the modulation coding mode that terminal is wanted.Wherein, table 2 and 3 is respectively:
| DIUC | Usage |
| 0—12 | Different?burst?profiles |
The modulation coding mode that the base station is supported among table 2 802.16e
| Label | Coding | Modulation system |
| 0 | 0b0000 | QPSK?1/2，repetition?6 |
| 1 | 0b0001 | QPSK?1/2，repetition?4 |
| 2 | 0b0010 | QPSK?1/2，repetition?2 |
| 3 | 0b0011 | QPSK?1/2 |
| 4 | 0b0100 | QPSK?3/4 |
| 5 | 0b0101 | 16-QAM?1/2 |
| 6 | 0b0110 | 16-QAM?3/4 |
| 7 | 0b0111 | 64-QAM?1/2 |
| 8 | 0b1000 | 64-QAM?2/3 |
| 9 | 0b1001 | 64-QAM?3/4 |
| 10 | 0b1010 | 64-QAM?5/6 |
| 11 | 0b1011 | A?decrease?in?CQICH?duration?is recommended(effective?CINR?has?not changed?from?previous?CQICH?slot).This encoding?shall?not?be?repeated?over consecutive CQI?slots. |
| 12-15 | 0b1100-0 b1111 | Reserved |
The correspondence table of feedback code and modulation system among table 3 802.16e
(3) described above is the feedback mechanism that adopts in the current 802.16e agreement, and there is following shortcoming in this mechanism:
(1) terminal can't be fed back the coded system of wanting.Determining of coded system, be the result that will see capability negotiation, 802.16e illustrate in the agreement: if capability negotiation the time negotiation of success coded system, that first coded system of successfully consulting is exactly the selected coded system of terminal, if successfully do not consult coded system, that coded system of forcing to use is exactly the selected coded system of terminal.As long as capability negotiation is finished, the coded system that is used to feed back that terminal can be selected for use has just been determined unique a kind of like this.When terminal is supported multiple coded system, just to have no idea to select for use flexibly, it is professional normally also can to influence terminal under some situation.For example: a certain terminal is supported 3 kinds of coded systems, CC is the coded system of forcing support, CTC is first coded system of successfully consulting, and BTC is second coded system of successfully consulting, and that is exactly the pairing coded system of modulation system of terminal feedback according to agreement CTC.The modulation coding mode that the base station is supported is as shown in table 5.Before the base station required terminal feedback Effective CINR, the modulation coding mode that terminal adopts was QPSK 1/2CC.When the base station assigns fast feedback channel requires terminal feedback Effective CINR, terminal is measured current CINR, discovery can be used the modulation system of 16QAM1/2, table look-up 3, the feedback code of 16QAM 1/2 correspondence is 5 (0b0101), but check the modulation coding mode table 5 that the base station is supported, find base station support 16QAM 1/2 CC, do not support 16QAM1/2 CTC, and terminal can only to indicate the modulation coding mode that will use by fast feedback channel feedback 5 be exactly 16QAM 1/2 CTC, terminal can only abandon using the modulation system 16QAM 1/2 of high-order like this, but still uses QPSK 1/2.Table look-up 3, the feedback code of QPSK 1/2 correspondence is 3 (0b0011), after the feedback code 3, modulation coding mode has been exactly QPSK 1/2CTC, rather than the QPSK1/2 CC before the feedback, with coded system without reason become CTC from CC.The final consequence that this feedback mechanism causes is exactly: original channel condition is good, and terminal can be used the modulation system of high-order, but can't use.But go to change coded system when there is no need to change coded system.
(2) mechanism of terminal feedback modulation system is very complicated.Each feedback, terminal is all wanted tentatively to determine modulation system according to CINR earlier, the coded system that is used for feeding back that the result that binding ability is consulted determines, table look-up again and 2 see whether the coded system that combines is that the base station is supported, up to finding a kind of suitable modulation system, tabling look-up 3 converts modulation system to feedback code and reports the base station.Corresponding anti-process is carried out after receiving feedback code in the base station.
Summary of the invention
The technical issues that need to address of the present invention are how to provide a kind of modulation encoded mode of rapid feedback channel to determine method, can use the needed modulation coding mode of terminal on Fast Channel and simplify feedback mechanism.
Above-mentioned technical problem of the present invention solves like this, provides a kind of modulation encoded mode of rapid feedback channel to determine method, may further comprise the steps:
1.1) 2. terminal select self and the 3. modulation coding mode all supported of base station according to 1. current channel condition;
1.2) terminal converts this modulation coding mode feedback code to and send to the base station by fast feedback channel;
1.3) base station receives and determine corresponding modulation coding mode according to described feedback code.
According to definite method provided by the invention, this method comprises that also the base station regularly describes DCD message by down channel and use sign indicating number DIUC table to send to terminal the downlink interval of the modulation coding mode correspondence of its support.
According to definite method provided by the invention, described step 1.1) in to select be to select the high order modulation coded system as far as possible in satisfying a plurality of modulation coding modes of 1., 2. and 3. condition.
According to definite method provided by the invention, described step 1.1) in channel condition include, but are not limited to descending signal to noise ratio.
According to definite method provided by the invention, described step 1.2) in conversion and described step 1.3) in definite dual mode that all comprises:
(1) conversion is earlier described modulation coding mode to be changed into downlink interval to use a sign indicating number DIUC to look into described downlink interval again to use sign indicating number DIUC table to obtain corresponding feedback code described step 1.2).
(2) conversion is directly described modulation coding mode to be changed into corresponding feedback code when can not find out corresponding DIUC definite described step 1.2 described step 1.3)).
(3) be earlier described feedback code to be changed into downlink interval to use a sign indicating number DIUC to look into described downlink interval again to use sign indicating number DIUC table to obtain the corresponding modulating coded system.
(4) determine when can not find out corresponding DIUC, directly described feedback code to be changed into the corresponding modulating coded system described step 1.3).
A kind of modulation encoded mode of rapid feedback channel provided by the invention is determined method, the direct modulation coding mode of selecting self and base station all to support according to current channel condition by terminal, avoid existing mode modulation coding mode is classified and repeatedly negotiation, thereby simple, terminal also can be fed back its modulation coding mode that needs flexibly accurately.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 be among the 802.16e in the capability negotiation about the schematic diagram of coded system;
Fig. 2 is that the present invention sends and receive the modulation coding mode schematic flow sheet;
Fig. 3 is that terminal transmission modulation coding mode of the present invention is intended to the base station illustrations;
Fig. 4 is the modulation coding mode illustrations intention that base station of the present invention receiving terminal sends.
Embodiment
As shown in Figure 2, the inventive method comprises following basic step:
(1) terminal 1 determines to want modulation system and the coded system used.Select the modulation coding mode principle as follows: the first, the modulation coding mode of selection must be that the base station is supported.The second, the coded system of selection must be terminal oneself support.The 3rd, modulation system will meet current channel condition.
(2) terminal 1 changes into the feedback code that feeds back on the fast feedback channel with modulation system and the coded system that chooses.
(3) terminal 1 sends to feedback code base station 2 on fast feedback channel.
(4) base station 2 receives feedback code on fast feedback channel.
(5) base station 2 changes into corresponding modulation system and coded system with feedback code.
These steps specifically are divided into (one) terminal part and (two) base station portion, wherein:
(1) terminal part
As shown in Figure 3, terminal feedback modulation coding mode is given the base station, comprising:
(a) when terminal need be fed back required modulation coding mode, terminal determines to want the modulation coding mode that uses according to the result of current channel condition and capability negotiation.Select the modulation coding mode principle as follows: the first, the modulation coding mode of selection must be that the base station is supported, promptly has in the table 2.The second, the coded system of selection must be terminal oneself support.The 3rd, modulation system will meet current channel condition.
(b) modulation coding mode that chooses of terminal judges, if not within the scope that DIUC represents, promptly not in table 2, execution in step (d) then, otherwise carry out next step.
(c) table look-up and 2 convert the modulation coding modes of selecting the value of DIUC to.According to the corresponding relation of DIUC, convert DIUC to feedback code again in feedback code.Forward step (e) to.
(d) connect step (b), directly obtain feedback code according to modulation coding mode.Carry out next step.
(e) feedback code is sent to the base station on fast feedback channel.
(2) base station portion
As shown in Figure 4, the modulation coding mode of base station receiving terminal feedback comprises:
(f) base station receives feedback code on fast feedback channel.Carry out next step.
(g) judge feedback code whether in the feedback code scope of DIUC correspondence, if not, execution in step (i) then, otherwise carry out next step.
(h) convert feedback code to DIUC, table look-up 2 then, obtain corresponding modulation coding mode according to the DIUC value.
(i) connect step (g), directly obtain modulation coding mode according to feedback code.
Further, illustrate:
Suppose:
(1) modulation coding mode of base station support is as shown in table 5.
(2) corresponding relation of feedback code and modulation coding mode is as shown in table 4.
| Label | Coding | Modulation coding mode |
| 0 | 0b0000 | DIUC＝0，Downlink?Burst?Profile?1 |
| 1 | 0b0001 | DIUC＝1，Downlink?Burst?Profile?2 |
| 2 | 0b0010 | DIUC＝2，Downlink?Burst?Profile?3 |
| 3 | 0b0011 | DIUC＝3，Downlink?Burst?Profile?4 |
| 4 | 0b0100 | DIUC＝4，Downlink?Burst?Profile?5 |
| 5 | 0b0101 | DIUC＝5，Downlink?Burst?Profile?6 |
| 6 | 0b0110 | DIUC＝6，Downlink?Burst?Profile?7 |
| 7 | 0b0111 | DIUC＝7，Downlink?Burst?Profile?8 |
| 8 | 0b1000 | DIUC＝8，Downlink?Burst?Profile?9 |
| 9 | 0b1001 | DIUC＝9，Downlink?Burst?Profile?10 |
| 10 | 0b1010 | DIUC＝10，Downlink?Burst?Profile?11 |
| 11 | 0b1011 | DIUC＝11，Downlink?Burst?Profile?12 |
| 12 | 0b1100 | DIUC＝12，Downlink?Burst?Profile?13 |
| 13 | 0b1101 | QPSK?1/2，repetition?2 |
| 14 | 0b1110 | QPSK?1/2，repetition?4 |
| 15 | 0b1111 | QPSK?1/2，repetition?6 |
Table 4 feedback code is shown with the corresponding example of modulation system
(3) after terminal and base station ability were consulted to finish, the coded system that the both supports was: CTC, BTC.CC is the coded system of forcing support in the agreement.
(4) terminal only decides the modulation system of needs use according to descending signal to noise ratio DL CINR, and is as shown in table 6.
Example 1:
If in the time of terminal feedback Effective CINR, DL CINR is 16, the modulation coding mode that is just adopting at present is QPSK 1/2CC.Channel condition improves.
Effective CINR feedback and the concrete steps that receive are as follows:
Terminal feedback modulation coding mode is given the base station:
(a) when terminal need be fed back Effective CINR, terminal tables look-up 6 according to current channel condition DL CINR, and DL CINR is that the modulation system of 16 correspondences is 16QAM1/2.The result of capability negotiation shows that the operable modulation coding mode of terminal is CTC, and BTC adds and forces operable coded system CC.Table look-up 5, the modulation system that the base station is supported is that the modulation coding mode of 16QAM1/2 has only: 16QAM1/2 CC.So the modulation coding mode that terminal can be selected is exactly 16QAM1/2 CC.At this moment, terminal will apply for converting modulation coding mode to 16QAM1/2 CC from QPSK1/2 CC on fast feedback channel.
(b) the modulation system 16QAM1/2 CC that chooses of terminal judges is in the modulation coding mode scope that DIUC represents, just tables look-up 5, and the DIUC value that obtains 16QAM1/2 CC correspondence is 3.The sign indicating number of feedback is exactly 3 so.
(c) terminal sends feedback code 3 to the base station on fast feedback channel.
The modulation coding mode of base station receiving terminal feedback:
(d) base station receives feedback code 3 on fast feedback channel.
(e) judge feedback code whether in the feedback code scope of DIUC correspondence, the feedback code scope of DIUC correspondence is 0～12.Feedback code is 3, less than 12.Then table look-at 5, and obtaining corresponding modulation coding mode is 16QAM1/2 CC.Wherein, table 5 is:
| DIUC | Usage |
| 0 | QPSK(CC)1/2 |
| 1 | QPSK(CTC)1/2 |
| 2 | QPSK(BTC)1/2 |
| 3 | 16-QAM(CC)1/2 |
| 4 | 16-QAM(BTC)3/5 |
| 5 | 64-QAM(CC)1/2 |
| 6 | 64-QAM(CTC)1/2 |
| 7 | 64-QAM(CTC)5/6 |
| 8 | 64-QAM(ZT?CC)1/2 |
| 9 | Do not use |
| 10 | Do not use |
| 11 | Do not use |
| 12 | Do not use |
The modulation coding mode example table that the base station is supported among table 5 802.16e
Example 2:
If in the time of terminal feedback Effective CINR, DL CINR is 6, the modulation coding mode that is just adopting at present is QPSK 1/2 CC.The channel condition variation.
Effective CINR feedback and the concrete steps that receive are as follows:
Terminal feedback modulation coding mode is given the base station:
(a) when terminal need be fed back Effective CINR, terminal tables look-up 6 according to current channel condition DL CINR, and DL CINR is that the modulation system of 6 correspondences is QPSK 1/2 (repetition 6).The result of capability negotiation shows that the operable modulation coding mode of terminal is CTC, and BTC adds and forces operable coded system CC.Table look-up 5, the modulation system that the base station is supported is that the modulation coding mode of QPSK 1/2 has: QPSK (CC) 1/2, QPSK (CTC) 1/2, QPSK (BTC) 1/2.So the modulation coding mode that terminal can be selected has 3 kinds: QPSK (CC) 1/2, QPSK (CTC) 1/2, QPSK (BTC) 1/2.Because the current coded system of using of terminal is CC, so terminal selects QPSK (CC) 1/2 as the modulation coding mode of wanting to use, and number of repetition is repetition 6.
(b) terminal judges QPSK 1/2 (repetition 6) just tables look-up 4 not in the modulating-coding scope that DIUC represents, obtaining the corresponding feedback code of QPSK 1/2 (repetition 6) is 15.
(c) terminal sends feedback code 15 to the base station on fast feedback channel.
The modulation coding mode of base station receiving terminal feedback:
(d) base station receives feedback code 15 on fast feedback channel.
(e) judge feedback code whether in the feedback code scope of DIUC correspondence, the feedback code scope of DIUC correspondence is 0～12.Feedback code is 15, greater than 12.Then table look-up 4, obtaining corresponding modulation system is QPSK 1/2, and number of repetition is repetition 6, and the current coded system of using of terminal is CC, so the modulation coding mode that terminal is wanted to use is QPSK 1/2 CC, and number of repetition is repetition 6.Wherein, table 6 is:
| Modulation system | Descending signal to noise ratio (DL CINR) |
| QPSK?1/2，repetition?6 | 5-8 |
| QPSK?1/2，repetition?4 | 9-10 |
| QPSK?1/2，repetition?2 | 11-12 |
| QPSK?1/2 | 13-14 |
| 16QAM?1/2 | 15-18 |
| 16QAM?3/5 | 19-21 |
| 64QAM?1/2 | 22-24 |
| 64QAM?5/6 | 25-31 |
Table 6 modulation system is shown with the corresponding example of DL CINR
Claims (8)
1, a kind of modulation encoded mode of rapid feedback channel is determined method, it is characterized in that, may further comprise the steps:
1.1) terminal (1) modulation coding mode of selecting self and base station (2) all to support according to current channel condition;
1.2) terminal (1) converts this modulation coding mode feedback code to and send to base station (2) by fast feedback channel;
1.3) base station (2) receive and determine corresponding modulation coding mode according to described feedback code.
According to the described definite method of claim 1, it is characterized in that 2, this method comprises that also base station (2) regularly uses code table to send to terminal the downlink interval of the modulation coding mode correspondence of its support by the down channel describing message.
3, according to the described definite method of claim 2, it is characterized in that described step 1.2) in conversion be earlier described modulation coding mode to be changed into downlink interval to use sign indicating number to look into described downlink interval again to use code table to obtain corresponding feedback code.
4, according to the described definite method of claim 2, it is characterized in that described step 1.3) in determine earlier described feedback code to be changed into downlink interval and use sign indicating number to look into described downlink interval again to use code table to obtain the corresponding modulating coded system.
5, according to the described definite method of claim 1, it is characterized in that described step 1.1) in to select be to select the high order modulation coded system as far as possible.
6, according to the described definite method of claim 1, it is characterized in that described step 1.1) in channel condition comprise descending signal to noise ratio.
7, according to the described definite method of claim 1, it is characterized in that described step 1.2) in the conversion be directly described modulation coding mode to be changed into corresponding feedback code.
8, according to the described definite method of claim 1, it is characterized in that described step 1.3) in determine directly described feedback code to be changed into the corresponding modulating coded system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848063A (en) * | 2010-05-21 | 2010-09-29 | 北京新岸线无线技术有限公司 | Data transmission method for supporting sub-channel modulation coding and wireless local area network system |
| CN101932001A (en) * | 2009-06-24 | 2010-12-29 | 中兴通讯股份有限公司 | Adaptive modulation coding method |
| CN103095391A (en) * | 2011-10-31 | 2013-05-08 | 上海贝尔股份有限公司 | Method and device for determining down link code modulation mode |
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2007
- 2007-11-20 CN CNA2007101873611A patent/CN101442382A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932001A (en) * | 2009-06-24 | 2010-12-29 | 中兴通讯股份有限公司 | Adaptive modulation coding method |
| CN101932001B (en) * | 2009-06-24 | 2013-08-21 | 中兴通讯股份有限公司 | Adaptive modulation coding method |
| CN101848063A (en) * | 2010-05-21 | 2010-09-29 | 北京新岸线无线技术有限公司 | Data transmission method for supporting sub-channel modulation coding and wireless local area network system |
| CN103095391A (en) * | 2011-10-31 | 2013-05-08 | 上海贝尔股份有限公司 | Method and device for determining down link code modulation mode |
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Application publication date: 20090527 |