CN1489409A - Adaptive modulating and coding device for mobile communication terminal - Google Patents
Adaptive modulating and coding device for mobile communication terminal Download PDFInfo
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- CN1489409A CN1489409A CNA031365434A CN03136543A CN1489409A CN 1489409 A CN1489409 A CN 1489409A CN A031365434 A CNA031365434 A CN A031365434A CN 03136543 A CN03136543 A CN 03136543A CN 1489409 A CN1489409 A CN 1489409A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/40—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses wherein the setting-operation short-circuits or open-circuits the transmitting mechanism during a variable part of a cycle
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
Abstract
The invented device comprises following parts. Encoder carries out coding for data to be sent. Channel interlacing device interleaves data. Modulator modulates data output from channel interlacing device. Based on feedback information that is estimated value of channel/SNR, transmitting antenna selection part selects transmitting antenna needed. BLAST process part receives data in sequence, then outputs the data. Channel/SNR estimator estimates channel condition information. Based on estimated value of channel/SNR, MCS horizontal selector connects the control signal needed for selecting optimal mode and coding form in MCS critical value to encoder, channel interlacing device and modulator. Based on estimated value of channel, the modulator modulates decoded data output from BLAST decoder. Channel deinterlacing device carries out channel deinterlacing for the demodulated data. The decoder decodes data output from channel deinterlacing device, and outputs information bits.
Description
Technical field
The present invention relates to a kind of method that makes the forward link transmission rate increase of mobile communication terminal, especially pass through at AMC (Adaptive Modulation and Coding, Adaptive Modulation Coding) combination (is selected transmit diversity as the STD of closed loop (Closed-loop) method in, Selection Transmit Diversity) all has the BLAST (Bell-Lab Layered Space-Time) of independent stratum level structure with each transmitting antenna, thereby improve the Adaptive Modulation and Coding device of mobile communication terminal of the transfer rate of error performance and forward link.
Background technology
Generally speaking, AMC has structure as shown in Figure 1, and it is to the channel estimation value of transmitting end feedback (Feedback) receiving terminal, to guarantee modulation and the emission of coding form with the best.
That is, send data and be encoded, interlocked, modulated and emission output by modulator (3) by interleaver (2) by encoder (1).
Then, pass through demodulator (4) by demodulation, simultaneously, detect signal to noise ratio (snr) by channel estimator (5) by the data that antenna (ANT) receives from the other side.
Therefore, above-mentioned demodulating data passes through channel de-interleaver (7) by release of an interleave, decoded and the output by decoder (8), according to passing through the detected channel estimation value of above-mentioned channel estimator (5), modulation/coding selector (6) is with the modulation of the best, the formation portion of coding morphology Control transmitting terminal.
At this moment, above-mentioned modulating-coding selector (MCS:Modulation Coding Scheme) 6 can be considered 4 kinds of situations shown in Figure 2, selected best transfer rate.
But just merely according to channel condition conversion modulation (Modulation) and coding form (Coding Scheme), though the transfer rate performance is improved, there is the problem that can't improve error performance in above-mentioned AMC.
And, as the BLAST of system configuration method, be divided into D (Diagonal)-BLAST and V (Vertical)-two kinds of forms of BLAST.
The common ground of above-mentioned dual mode is, according to the number of transmitting antenna, the transmission data of input successively carried out parallelization, carries out modulation and coding, and the continuation input along with data forms the bit stream that is equivalent to number of transmit antennas, i.e. " layer (layer) ".
As shown in Figure 3, use the transmitting end structure of the mobile communication terminal of above-mentioned D-BLAST, can make from the cycle data ground of a certain layer output and transmit by different antennae, therefore, on space, time shaft, the data of layer are pressed the diagonal transmission.
But, use the method for above-mentioned D-BLAST, though error performance is improved, there is the problem that can not improve transfer rate.
As shown in Figure 4, use the transmitting end structure of the mobile communication terminal of above-mentioned V-BLAST, the data of each layer are transmitted by intrinsic transmitting antenna, therefore, on space, time shaft, have vertical form.Also there is identical problem in the method for this application V-BLAST,, though improved error performance, can not improve transfer rate that is.
As a reference, Fig. 5 is the schematic diagram that demonstrates the channel characteristic that uses the MIMO multichannel multiplexing method.When using multiple antenna in the sending and receiving end, as using the MIMO multichannel multiplexing method, other data then can increase the maximum throughput (Peak throughput) of system by each transmitting antenna transmission.
Then, as shown in Figure 6,,,, then, therefore can receive best data at receiving terminal only from meeting the antenna emission of best channel condition as sending information to transmitting end from receiving terminal feedback (Feedback) channel condition as the STD of closed-loop policy.As shown in Figure 7, different with the STTD of equalization (Averaging), by selecting the best transmit antenna, thereby had the SNR of the STTD of being better than (Space Time Transmit Diversity, Space-Time Transmit Diversity).
But, though the STD of method is remarkable to improving the error performance effect, have the problem that can not improve transfer rate as above-mentioned diversity (Diversity).
Summary of the invention
For this reason, the present invention develops for the problem that solves as above in the past, purpose is the BLAST (Bell-Lab Layered Space-Time) that all has the independent stratum level structure as STD (Selection Transmit Diversity) and each transmitting antenna of closed loop (Closed-loop) method by in AMC (Adaptive Modulation Coding) combination, thereby a kind of mobile communication terminal Adaptive Modulation and Coding device that improves the transfer rate of error performance and forward link is provided.
For achieving the above object, feature of the present invention is to comprise following structure: encoder is encoded to sending data; Interleaver is to interlocking from the data of above-mentioned encoder output; Modulator is to modulating from the data of above-mentioned interleaver output; The required transmitting antenna of the above-mentioned modulating data of output is selected according to feedback information-channel/SNR estimated value by emitting antenna selecting portion; The BLAST handling part receives successively from the data of said modulator output, exports this data by the transmitting antenna of above-mentioned selection; The BLAST decoder carries out the BLAST decoding to the data that receive by antenna; Channel/SNR estimator receives the data through above-mentioned BLAST decoding, estimates channel condition information; MCS horizontal selector (MCS LEVEL SELECTOR) is according to the channel/SNR estimated value from above-mentioned channel/SNR estimator output, selecting the required control signal of best mode and coding form to insert encoder, interleaver, modulator in the MCS critical value; Demodulator carries out demodulation according to above-mentioned channel estimation value to the decoded data from above-mentioned BLAST decoder output; Channel de-interleaver is carried out the channel release of an interleave to the demodulating data from above-mentioned demodulator output; Decoder is to decoding and the output information bit from the data of above-mentioned channel de-interleaver output.
Description of drawings
Fig. 1 is that AMC (Adaptive Modulation Coding) constituted block diagram in the past.
Fig. 2 is the schematic diagram of the alternative condition of MCS selector among the key diagram 1AMC.
Fig. 3 is the transmitting end structure skeleton diagram of D-BLAST in the past.
Fig. 4 is the transmitting end structure skeleton diagram of V-BLAST in the past.
Fig. 5 is the schematic diagram that demonstrates the channel characteristic that uses the MIMO multichannel multiplexing method.
Fig. 6 illustrates the schematic diagram of the elemental motion of STD in the past.
Fig. 7 is based on the SNR state diagram of the STD of above-mentioned Fig. 5.
Fig. 8 is the schematic diagram that shows the performance when making up AMC and BLAST by the present invention.
Fig. 9 shows to have made up in AMC as the formation block diagram behind the STD of closed-loop policy by the present invention.
Figure 10 shows the structured flowchart that combines the device of BLAST and STD by the present invention.
Figure 11 shows the structured flowchart that combines the device of AMC, STD and BLAST by the present invention.
Figure 12 is presented at the FER (the frame error rate, Frame ErrorRate) in the AMC method in the past and the schematic diagram of throughput (Throughput).
Figure 13 is the schematic diagram of the error performance that shows that diversity produced in the past.
Figure 14 is the schematic diagram that shows the error performance that BLAST produced in the past when transmitting antenna is 2.
Figure 15 is the schematic diagram that shows the error performance that BLAST produced in the past when transmitting antenna is 4.
Figure 16 shows to have made up AMC and diversity (STTD, the schematic diagram of the performance in the time of STD) by the present invention.
Figure 17 is the state diagram that shows the performance when having made up AMC and BLAST by the present invention.
The state diagram of the performance during Figure 18 has been comparison combination AMC and BLAST and AMC and STD.
Figure 19 is the state diagram that shows the performance when having made up BLAST and STD by the present invention.
Figure 20 is the state diagram that shows the performance when having made up AMC, STD and BLAST by the present invention.
Embodiment
Useful embodiment of the present invention is described with reference to the accompanying drawings.Many specific detail such as concrete handling process in the following explanation provide for more fully understanding the present invention, for the people with this field general knowledge, do not have these specific detail, and the present invention also can implement.And for well-known function of a part and formation, we think may upset main idea of the present invention, thereby has omitted detailed description thereof.
Fig. 8 is the formation block diagram that is presented at the device that has made up BLAST among the AMC of the present invention, fed back (Feedback) information notification the AMC modulation of all antennas or each antenna, the LEVEL that encodes have been selected information, according to this information, transmitting end at all transmitting antennas or each transmitting antenna, determines best modulation system and coding form in the MCS critical value.
That is, it is a kind of device that has made up AMC and BLAST, and its structure is as follows: encoder (101) is encoded to sending data; Interleaver (102) is to interlocking from the data of above-mentioned encoder (101) output; Modulator (103) is to modulating from the data of above-mentioned interleaver (102) output; BLAST handling part (104) receives successively from the data of said modulator (103) output, according to the number of transmitting antenna these data is carried out parallelization and handles and export; BLAST decoder (105) carries out the BLAST decoding to the data that receive by antenna; Channel estimator (106) receives the data through above-mentioned BLAST decoding, estimates channel condition information; MCS horizontal selector (110) is according to the channel estimation value from above-mentioned channel estimator (106) output, selecting the required control signal of best mode and coding form to insert encoder (101), interleaver (102), modulator (103) in the MCS critical value; Demodulator (107) carries out demodulation according to above-mentioned channel estimation value to the decoded data from above-mentioned BLAST decoder output; Channel de-interleaver (108) is carried out the channel release of an interleave to the demodulating data from above-mentioned demodulator (107) output; Decoder (109) is to decoding and the output information bit from the data of above-mentioned channel de-interleaver (108) output.The work that should install describes below.
At first, BLAST decoder (105) carries out the BLAST decoding to the data that receive by antenna, and it is linked into channel estimator (106) and demodulator (107), above-mentioned channel estimator (106) is received from the data of above-mentioned BLAST decoder (105) output, estimate channel condition information, and thus obtained channel status estimated value is inserted demodulator (107) and MCS horizontal selector (110).
Then, above-mentioned MCS horizontal selector (110) is according to the channel estimation value from above-mentioned channel estimator (106) output, selecting best mode and the required control signal of coding form to be linked into encoder (101), interleaver (102), modulator (103) in the MCS critical value.
Then, above-mentioned encoder (101), interleaver (102), modulator (103) according to select based on the control signal of above-mentioned MCS horizontal selector (110), in the MCS critical value, come deal with data with the coding form in the best way.Wherein, encoder (101) is encoded to sending data, after interlocking by interleaver (102), at modulator (103) data of exporting from interleaver (102) is modulated and is exported.
Then, BLAST handling part (104) receives successively from the data of said modulator (103) output, according to the number of transmitting antenna, these data is carried out parallelization handle and export.
Fig. 9 was presented in the past to have made up as the formation block diagram behind the STD of closed-loop policy among the AMC.As shown in the figure, its structure is as follows: Turbo encoder (202) is encoded to the information bit (201) that sends; Interleaver (203) is to interlocking through above-mentioned information encoded bit; Symbol transition portion (204) is to carrying out glossary of symbols mapping (Constellation Mapping) and symbol transition through above-mentioned staggered information; Modulation portion (205) is carried out channelization modulation (WalshModulation) to above-mentioned symbol data; Scrambling portion (206) is to carrying out scrambling through the data of above-mentioned channelizing (Walsh) modulation; Antenna selection portion (207) selects to meet the antenna of best channel condition, and output is through the data of above-mentioned scrambling; Channel compensation portion (208) compensates the channel of the symbol data that receives by antenna (Rx.Ant); Descrambling portion (211) carries out descrambling to the data through above-mentioned channel compensation; Demodulation section (212) is to carrying out channelizing (Walsh) demodulation through the data of above-mentioned descrambling; Bits switch portion (213) is becoming information bit through above-mentioned channelizing (Walsh) demodulated symbols data transaction; Channel de-interleaver (214) is carried out release of an interleave to the information bit through above-mentioned conversion; MAP decoder (215) is to decoding through the data of above-mentioned release of an interleave and output information bit (216); Channel information test section (209) is in the information that detects in the symbol data of above-mentioned channel compensation about sky line options and channel status; MCS selector (210) carries out best modulation, coding according to above-mentioned channel information controlled encoder (202), interleaver (203), symbol transition portion (204) to information bit.
Promptly as implied above, in AMC in the structure of combination as the STD of closed-loop policy, feedback (Feedback) information notification AMC modulation, code levels (LEVEL) selection and day line options information, transmitting end determines best modulation system and coding form according to this Information Selection transmit antenna in the MCS critical value.
Figure 10 shows the structured flowchart that combines the device of BLAST and STD by the present invention.As shown in the figure, its structure is as follows: encoder (301) is encoded to sending data; Interleaver (302) is to interlocking from the data of above-mentioned encoder (301) output; Modulator (303) is to modulating from the data of above-mentioned interleaver (302) output; The data required transmitting antenna of output from said modulator (303) output selected by emitting antenna selecting portion (304); BLAST handling part (305) receives the data of above-mentioned output successively, by exporting this data through the antenna of above-mentioned selection; BLAST decoder (306) carries out the BLAST decoding to the data that receive by antenna; Channel/SNR estimator (307) receives the data through above-mentioned BLAST decoding, estimates channel condition information, and to emitting antenna selecting portion (304) and demodulator (308) output; Demodulator (308) carries out demodulation according to above-mentioned channel/SNR estimated value to the decoded data from above-mentioned BLAST decoder (306) output; Channel de-interleaver (309) is carried out the channel release of an interleave to the demodulating data from above-mentioned demodulator (308) output; Decoder (310) is to decoding the output information bit from the data of above-mentioned channel de-interleaver (309) output.The work that should install describes below.
At first, BLAST decoder (306) carries out the BLAST decoding to the data that receive by antenna, and with its access channel/SNR estimator (307) and demodulator (308), above-mentioned channel/SNR estimator (307) inserts emitting antenna selecting portion (304) with channel/SNR estimated value, thereby can choose the transmitting antenna that meets best channel condition.
Then, demodulator (308) carries out demodulation according to above-mentioned channel/SNR estimated value to the decoded data from above-mentioned BLAST decoder (306) output, channel de-interleaver (309) is carried out the channel release of an interleave to the demodulating data from above-mentioned demodulator (308) output, decode the output information bit to realize the data of release of an interleave by decoder (310).
Figure 11 shows the structured flowchart that combines the device of AMC, STD and BLAST by the present invention.As shown in the figure, its structure is as follows: encoder (401) is encoded to sending data; Interleaver (402) is to interlocking from the data of above-mentioned encoder (401) output; Modulator (403) is to modulating from the data of above-mentioned interleaver (402) output; The required transmitting antenna of the above-mentioned modulating data of output is selected according to the channel/SNR estimated value as feedback information by emitting antenna selecting portion (404); BLAST handling part (405) receives successively from the data of said modulator (403) output, and exports this data by the transmitting antenna of above-mentioned selection; BLAST decoder (406) carries out the BLAST decoding to the data that receive by antenna; Channel/SNR estimator (407) receives the data through above-mentioned BLAST decoding, estimates channel condition information; MCS horizontal selector (411) is according to the channel/SNR estimated value from above-mentioned channel/SNR estimator (407) output, selecting the required control signal of best mode and coding form to insert encoder (401), interleaver (402), modulator (403) in the MCS critical value; Demodulator (408) carries out demodulation according to above-mentioned channel estimation value to the decoded data from above-mentioned BLAST decoder (406) output; Channel de-interleaver (409) is carried out the channel release of an interleave to the demodulating data from above-mentioned demodulator (408) output; Decoder (410) is to decoding the output information bit from the data of above-mentioned channel de-interleaver (409) output.The work that should install describes below.
At first, BLAST decoder (406) carries out the BLAST decoding to the data that receive by antenna, with its access channel/SNR estimator (407) and demodulator (408), above-mentioned channel/SNR estimator (407) receives from the data of above-mentioned BLAST decoder (406) output, estimate channel/SNR state information, and thus obtained channel/SNR state estimation value is linked into demodulator (408) and MCS horizontal selector (411) and emitting antenna selecting portion (404).
Then, above-mentioned MCS horizontal selector (411) is according to the channel/SNR estimated value from above-mentioned channel/SNR estimator (407) output, in the MCS critical value, selecting the required control signal of best mode and coding form to insert encoder (404), interleaver (402), modulator (403), above-mentioned encoder (401), interleaver (402), modulator (403) is according to selecting based on the control signal of above-mentioned MCS horizontal selector (411), mode and coding form with the best in the MCS critical value are come deal with data, promptly, encoder (401) is encoded to sending data, after interlocking by interleaver (402), in modulator (403), the data of this interleaver (402) output are modulated and exported.
Then, BLAST handling part (405) receives successively from the data of said modulator (403) output, exports by the antenna of selecting in emitting antenna selecting portion (404).
As a reference, accompanying drawing 12 to 20 is to use in the past AMC and the performance relatively state diagram of the performance when STD, BLAST single method when adopting STD+BLAST and AMC+STD+BLAST by the present invention.
At first, Figure 12 is the state diagram that shows FER (Frame Error Rate) and throughput in AMC, and it can select best MCS level according to channel condition.
What Figure 13 showed is the error performance of diversity decision.Hence one can see that, no matter is QPSK or 8PSK, and the performance of STD more is better than STTD.
What Figure 14 showed is the error performance of the BLAST decision when transmitting antenna is 2, and what Figure 15 showed is the error performance of the BLAST decision when transmitting antenna is 4.Particularly the mode except that invalid (nulling) of cancellation (Canceling) only is expressed as INV, this is that the pseudo-inverse (pseudo-inverse) that channel is replied ranks be multiply by received signal, only carry out invalid (nulling), played the effect that comes the influence that compensate for channel is subjected to the ZF method.
At this moment, if when carrying out the V-BLAST of invalid (nulling) and cancellation (canceling), then consider 2 kinds of invalid (nulling) modes of MMSE and ZF mode.
Showing that Figure 16 shows is to have made up AMC and diversity (diversity) (STTD, the performance in the time of STD) by the present invention.Therefrom as can be seen, combination AMC and STD, this has obtained to be better than the performance of AMC.
Figure 17 shows is performance when having made up AMC and BLAST by the present invention.Therefrom as can be seen, for AMC, combination AMC and BLAST, this has further improved performance aspect transfer rate.
Performance during Figure 18 has been comparison combination AMC and BLAST and AMC and STD.Therefrom as can be seen, compare with the device of STD with having made up AMC, the performance of device that has made up AMC and BLAST is better aspect transfer rate.
Figure 19 shows is performance when having made up BLAST and STD by the present invention.Therefrom as can be seen, compare with the device that only constitutes with BLAST, the device that combines STD and BLAST is at BER (bit error rate, Bit Error Rate) aspect, and performance has obtained further raising.
Figure 20 is to combining the performance of the device of AMC, STD and BLAST by the present invention, compare with the performance that combines the device of BLAST at single AMC and AMC.Therefrom as can be seen, compare with AMC or AMC+BLAST (2 * 2 MMSE), AMC+STD+BLAST (2 among, 4: 2 * 2 MMSE) performance is better aspect transfer rate.
As the above-mentioned explanation of doing, the Adaptive Modulation and Coding device of mobile communication terminal of the present invention is by the BLAST (Bell-Lab Layered Space-Time) of the independent stratum level structure that all has of each transmitting antenna of combination in AMC (Adaptive Modulation Coding), thereby has the effect that improves error performance and forward link transmission rate.
Claims (2)
1. the Adaptive Modulation and Coding device of a mobile communication terminal is characterized in that having following structure:
Encoder is to sending encoding of data;
Interleaver interlocks to the data of above-mentioned encoder output;
Modulator is modulated the data of above-mentioned interleaver output;
The data required transmitting antenna of output from said modulator output selected by emitting antenna selecting portion;
The BLAST handling part receives the data of above-mentioned output successively, exports this data by the antenna of above-mentioned selection;
The BLAST decoder carries out the BLAST decoding to the data that receive by antenna;
Channel/SNR estimator receives the data through above-mentioned BLAST decoding, estimates channel condition information, and outputs to emitting antenna selecting portion and demodulator;
Demodulator is according to above-mentioned channel/SNR estimated value, and the decoded data that above-mentioned BLAST decoder is exported carries out demodulation;
Channel de-interleaver is carried out the channel release of an interleave to the demodulating data from above-mentioned demodulator output;
Decoder is to decoding the output information bit from the data of above-mentioned channel de-interleaver output.
2. the Adaptive Modulation and Coding device of a mobile communication terminal is characterized in that having following structure:
Encoder is to sending encoding of data;
Interleaver interlocks to the data of above-mentioned encoder output;
Modulator is modulated the data of above-mentioned interleaver output;
The required transmitting antenna of the above-mentioned modulating data of output is selected according to the channel/SNR estimated value as feedback information by emitting antenna selecting portion;
The BLAST handling part receives the data of said modulator output successively, exports this data by the antenna of above-mentioned selection;
The BLAST decoder carries out the BLAST decoding to the data that receive by antenna;
Channel/SNR estimator receives the data through above-mentioned BLAST decoding, estimates channel condition information;
The MCS horizontal selector is according to the channel/SNR estimated value from above-mentioned channel/SNR estimator output, selecting the required control signal of best mode and coding form to insert encoder, interleaver, modulator in the MCS critical value;
Demodulator carries out demodulation according to above-mentioned channel estimation value to the decoded data from above-mentioned BLAST decoder output;
Channel de-interleaver is carried out the channel release of an interleave to the demodulating data from above-mentioned demodulator output;
Decoder is to decoding the output information bit from the data of above-mentioned channel de-interleaver output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0061905A KR100438564B1 (en) | 2002-10-10 | 2002-10-10 | Adaptive modulation coding apparatus for mobile communication device |
| KR0061905/2002 | 2002-10-10 |
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| CN1489409A true CN1489409A (en) | 2004-04-14 |
| CN1233191C CN1233191C (en) | 2005-12-21 |
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| CNB031365434A Expired - Fee Related CN1233191C (en) | 2002-10-10 | 2003-05-23 | Adaptive modulating and coding device for mobile communication terminal |
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| WO2007062580A1 (en) * | 2005-11-29 | 2007-06-07 | Southeast University | An self-adpting transmission scheme of the channel environment in the multi-antenna wireless transmission system |
| CN100388645C (en) * | 2004-09-28 | 2008-05-14 | 上海贝尔阿尔卡特股份有限公司 | Pre-coding method and device for improving V-BLAST detection performance |
| WO2010000134A1 (en) * | 2008-07-03 | 2010-01-07 | 中兴通讯股份有限公司 | Data transmitting method |
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| CN1808958B (en) * | 2005-01-21 | 2012-08-08 | 株式会社日立制作所 | Adaptive modulation scheme and coding rate control method |
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| KR100754660B1 (en) * | 2004-06-19 | 2007-09-03 | 삼성전자주식회사 | System and method for allocating adaptive modulation and coding sub-channel in communication system |
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| KR100246462B1 (en) * | 1997-12-26 | 2000-03-15 | 서정욱 | Apparatus and method for adaptive switching of modulation and demodulation in tranceiver |
| JP2000261398A (en) * | 1999-03-11 | 2000-09-22 | Kokusai Electric Co Ltd | Communication equipment |
| US6542558B1 (en) * | 1999-05-28 | 2003-04-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Optimum turbo decoding architecture and method using a constant or quasi-constant signal-to-noise ratio |
| KR100787026B1 (en) * | 2001-12-31 | 2007-12-18 | 엘지전자 주식회사 | Data transmitter and receiver using adaptive modulation technique and multi-carrier wave |
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| KR20030083489A (en) * | 2002-04-23 | 2003-10-30 | 삼성전자주식회사 | Diversity reception apparatus and method in a mobile communication system |
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| CN100388645C (en) * | 2004-09-28 | 2008-05-14 | 上海贝尔阿尔卡特股份有限公司 | Pre-coding method and device for improving V-BLAST detection performance |
| CN101032156B (en) * | 2004-09-30 | 2012-06-06 | 摩托罗拉解决方案公司 | Method for the selection of forward error correction (fec)/ constellation pairings for digital transmitted segments based on learning radio link adaptation (rla) |
| CN1808958B (en) * | 2005-01-21 | 2012-08-08 | 株式会社日立制作所 | Adaptive modulation scheme and coding rate control method |
| CN1855798B (en) * | 2005-04-21 | 2011-09-28 | 美国博通公司 | RF transceiver having adaptive modulation |
| WO2007062580A1 (en) * | 2005-11-29 | 2007-06-07 | Southeast University | An self-adpting transmission scheme of the channel environment in the multi-antenna wireless transmission system |
| US8311142B2 (en) | 2005-11-29 | 2012-11-13 | Southeast University | Self-adapting transmission scheme of the channel environment in the multi-antenna wireless transmission system |
| CN101340609B (en) * | 2007-07-04 | 2011-10-26 | 上海华为技术有限公司 | Broadcast multicast service transmitting method, apparatus and system |
| CN101615971B (en) * | 2008-06-24 | 2012-11-14 | 中兴通讯股份有限公司 | Method for receiving wireless data |
| WO2010000134A1 (en) * | 2008-07-03 | 2010-01-07 | 中兴通讯股份有限公司 | Data transmitting method |
| CN105634676A (en) * | 2016-02-01 | 2016-06-01 | 河北科技师范学院 | Communication system applying structural data object transmission architecture |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100438564B1 (en) | 2004-07-02 |
| CN1233191C (en) | 2005-12-21 |
| KR20040032680A (en) | 2004-04-17 |
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