CN102611543A - Retransmission method, transmitting device and communication system - Google Patents
Retransmission method, transmitting device and communication system Download PDFInfo
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- CN102611543A CN102611543A CN2012100886899A CN201210088689A CN102611543A CN 102611543 A CN102611543 A CN 102611543A CN 2012100886899 A CN2012100886899 A CN 2012100886899A CN 201210088689 A CN201210088689 A CN 201210088689A CN 102611543 A CN102611543 A CN 102611543A
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Abstract
The invention provides a retransmission method, a transmitting device and a communication system for automatically retransmitting a request of a transmitting device communicating with a receiving device in an MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) communication system. The retransmission method comprises a receiving step of receiving feedback information of positive acknowledgement or negative acknowledge of a result of a cyclic redundancy check based on the receiving device, and a selecting step of selecting a retransmission mode. The retransmission mode of data signals is selected from a first mode of using one antenna to send data and using the other antenna to send the other data simultaneously and a second mode of using a space diversity technology to send the data according to the feedback information.
Description
The application be that September 13, application number in 2004 are 200480043975.7 the applying date, denomination of invention divides an application for the application for a patent for invention of " the automatic repeat requests control system and the method for OFDM multi-input multi-output system ".
Technical field
The present invention relates to a kind of automatic repeat requests (ARQ) control system and repeating method that is used for using multiple-input and multiple-output (MIMO) communication system of OFDM (OFDM).
Background technology
Using many (N
T) transmitting antenna and Duo Gen (N
R) send when carrying out a plurality of data flow in the MIMO communication system of reception antenna.According to the mode of utilizing, mimo system can be realized the raising of performance through space diversity, and can realize the raising of power system capacity through spatial reuse.Owing to have at random decline and multidiameter diffusion in the wireless communication system, make above-mentioned improvement become possibility.
Generally speaking, being present in a plurality of communication channels between transmitting antenna and the reception antenna changes at any time and is in the linking status that differs from one another.Mimo system with feedback function offers dispensing device with channel condition information (CSI), for higher levels of performance is provided, makes the use of link adaptation techniques (link adaptation) and water flood methods such as (water filling) become possibility.
1 pair of known technology through spatial reuse raising data rate of non-patent literature is discussed.
The space-time block encoding of the great advantage through branch collection is provided comes implementation space Fen Ji.Relevant space-time block encoding, for example on the books in non-patent literature 2.
The MIMO technology is originally the hypothesis narrow-band wireless systems, and promptly flat fading channel is designed.So, in frequency-selective channel, be difficult to obtain good effect.Therefore, in order to overcome the problem of the frequency-selective channel that wireless environment proposes, OFDM and mimo system are united use.
Through using invert fast fourier transformation (IFFT), OFDM can be transformed to frequency-selective channel the group of a plurality of subchannels of independent and parallel CF (frequency-flat).Since these subchannels separately frequency orthogonal and also overlap each other, so improve spectrum efficiency and inter-carrier interference minimized.Through to OFDM code element pended cyclic prefix (Cyclic Prefix), can reduce the influence of multipath further.
Technology transfer from now on need be satisfied user's carrying capacity, end-to-end delay time (End-to-End Latency), the Q o S (Quality-of-Service of spectrum efficiency, system; Service quality) requirement condition of management etc. is so that adapt to the high-speed data service improved the IP dependency degree.The MIMO-OFDM system can satisfy the part of above-mentioned condition standard, and the ARQ technology also plays important effect in carrying out the high distribution of high speed and reliability effectively.
ARQ is a kind of technology that is used for when the grouped data that receives detects mistake sending to the repeat requests of the grouped data that received.In a large amount of high-speed datas was transmitted, the ARQ technology that general service efficiency is higher was so that reduce the number of times of repeat requests.
Hybrid ARQ (HARQ) technology comprises follows the trail of merging (Chase Combining) and incremental redundancy (Incremental Redundancy), and raises the efficiency through reducing the ARQ expense.The HARQ technology is to design for prerequisite with the dispensing device of single antenna and receiving system basically.
Non-patent literature 1: " V-BLAST:an architecture for realising very high data rates over the rich-scattering wireless channel " by P W Wolniansky et al in the published papers of the 1998 URSI International Symposium on Signals; Systems and Electronics; Pisa; Italy, Sep.29 to Oct.2,1998.
Non-patent literature 2:Tarokh, V., Jafarkhani; H., Calderbank, A.R.:Space-Time Block Codes from Orthogonal Designs; IEEE Transactions on information theory, Vol.45, pp.1456-1467; July 1999, and in WO 99/15871.
Summary of the invention
Yet the technology with HARQ is applied to the MIMO-OFDM system was not suggested in the past.
Inventor of the present invention considers the above-mentioned fact; Made the present invention; Therefore the present invention aims to provide a kind of automatic repeat requests control system and repeating method; This automatic repeat requests control system and repeating method can be controlled repeating method according to various system requirements when HARQ is applied to the MIMO-OFDM system.And the present invention is intended to improve the data throughout performance thus through the re-transmission accuracy and minimizing repeat requests number of times that improves signal.
The automatic repeat requests control system and the repeating method of the MIMO-OFDM of being used for of the present invention system comprise following structure or step.
Whether the ARQ control unit module of dispensing device is judged needs re-transmitted signal.When the needs re-transmitted signal, this module is the type of the employed mode of control further.The ARQ module is according to judging from the ARQ feedback information of receiving system.Whether system allows to take place the system requirements whether mistake, system allow to postpone etc. and also in decision process, plays important effect.
In the system of the present invention; Receiving system carries out CRC (cyclic redundancy check to each antenna chains; CRC); Dispensing device according to from receiving system, based on the feedback information of CRC result's affirmative acknowledgement (ACK) or negative response (NACK), every transmitting antenna is judged whether need data retransmission.
When needing to retransmit, a kind of mode in four kinds of re-transmission modes that propose according to the present invention retransmits.According to various system requirements condition standards such as time of delay (latency) and performance level etc., select best re-transmission mode.
The reliability that the present invention supposes to receive the antenna of ACK is higher than the antenna that receives NACK.By the data of the high antenna transmission of reliability, higher by correct possibility of restoring.
In one embodiment of the present of invention, use with the identical antenna of last transmission and send the data that will retransmit, use not by the new data of the antenna transmission of request retransmission simultaneously.The advantage of this method is to reduce the complexity that comes from data re-transmission and raises the efficiency.
In an alternative embodiment of the invention, the antenna that dependability is high (that is, not by the antenna of request retransmission) sends the data that will retransmit, and uses other antenna to send new data.This method has the advantage that can reduce the required number of retransmissions of certain error packet, also has the shortcoming that can improve complexity.
In an alternative embodiment of the invention, the antenna that dependability is high, the STBC of usage space diversity technique carries out the re-transmission of data.Even take place in the system of mistake not allowing, this method also can satisfy the requirement to the mode that retransmits accurately that requires less delay.
In an alternative embodiment of the invention, use STBC to carry out the re-transmission of packet equally, and not only the high antenna of dependability also use all spendable antennas to retransmit.But this method is used as the highest re-transmission mode of accuracy, is suitable for not allowing mistake takes place the system that can allow to postpone.
As the distortion of the embodiment that uses STBC to retransmit, the modulation of using high-order more is so that improve retransmission efficiency.
Comprise in the distortion of the foregoing description that (Incremental Redundancy, the IR) re-transmission of the multiple combination of type ARQ and use interlace mode is so that improve the performance of system for the use incremental redundancy.
Another distortion of the foregoing description comprises the link adaptation techniques of the ARQ statistical information of having used between longer-term.Need not carry out the feedback and the complex processing of channel condition information (CSI) this moment.
According to the present invention, when HARQ is applied to the MIMO-OFDM system, can control repeating method according to various system requirements.And according to the present invention, accuracy and minimizing repeat requests number of times through further raising signal retransmits might realize the raising of data throughout performance.
According to an aspect of the present invention; The repeating method of the automatic repeat requests of dispensing device a kind of multiple-input-multiple-output communication system that is used for using OFDM, that communicate with receiving system is provided; Comprise: receiving step receives the result's be based on the CRC that said receiving system carries out the affirmative acknowledgement or the feedback information of negative response; And selection retransmits the model selection step; According to said feedback information; Use first pattern and the usage space diversity technique of other other data of antenna transmission to send second pattern of data from using antenna transmission data simultaneously, select the re-transmission pattern of data-signal.
According to another aspect of the present invention; A kind of dispensing device multiple-input-multiple-output communication system, that utilize automatic repeat requests control, that communicate with receiving system that is used for using OFDM is provided; Comprise: receiving element receives the result's be based on the CRC that said receiving system carries out the affirmative acknowledgement or the feedback information of negative response; And selection retransmits mode selecting unit; According to said feedback information; Use first pattern and the usage space diversity technique of other other data of antenna transmission to send second pattern of data from using antenna transmission data simultaneously, select the re-transmission pattern of data-signal.
According to another aspect of the present invention; A kind of communication system multiple-input-multiple-output communication system, that utilize automatic repeat requests control that is used for using OFDM is provided; Comprise receiving system and dispensing device: receiving system has: the CRC processing unit, carry out CRC for the data that receive from said dispensing device; And the acknowledgement/non-acknowledgement output unit, according to the result of said CRC, generate the feedback information of affirmative acknowledgement or negative response, and said feedback information is sent to said dispensing device; Said dispensing device has: receiving element receives the feedback information of said affirmative acknowledgement or said negative response from said receiving system; And re-transmission mode selecting unit; According to said feedback information; Use first pattern and the usage space diversity technique of other other data of antenna transmission to send second pattern of data from using antenna transmission data simultaneously, select the re-transmission pattern of data-signal.
Description of drawings
Fig. 1 is the block diagram of the dispensing device of MIMO-OFDM communication system;
Fig. 2 is the block diagram of the receiving system of MIMO-OFDM communication system;
Fig. 3 is transmission ARQ control unit of the present invention and the functional-block diagram that receives the ARQ control unit;
Fig. 4 is the example of scheme (scenario) is set in expression according to the re-transmission of the packet of repeating method of the present invention figure;
Fig. 5 is the example of scheme is set in expression according to the re-transmission of the packet of repeating method of the present invention figure;
Fig. 6 is the example of scheme is set in expression according to the re-transmission of the packet of repeating method of the present invention figure; And
Fig. 7 is the example of scheme is set in expression according to the re-transmission of the packet of repeating method of the present invention figure.
Embodiment
Below, with reference to accompanying drawing embodiments of the invention are described at length.
Fig. 1 is to use the block diagram of dispensing device 100 of the multiple-input-multiple-output communication system (that is MIMO-OFDM system) of OFDM.Fig. 2 is the block diagram of the receiving system 200 of this system.The system of two transmitting antennas and two reception antennas is used in expression among two width of cloth figure, and still, the present invention can expand to the system that uses many (NT) transmitting antennas and Duo Gen (NR) reception antenna.
In the dispensing device 100, each antenna chains is carried out data processing.Send the stream of different mutually independent datas by every transmitting antenna.The input data are at first through CRC extra cell 102 additional cycles redundancy checks (CRC) sign indicating number.Then, carrying out chnnel codings such as convolutional encoding, Turbo coding through coding unit 104 handles.Then, interweave through interleave unit 106, so that reduce the burst error in the data through coded data.Carrying out multistage modulation constellation symbol mapped through 108 pairs of map unit through the data that interweave handles.Insert pilot signal through 110 pairs of signals of pilot plug-in unit through mapping.Through inserting pilot signal, can carry out channel estimating easily at receiving system.
Before carrying out OFDM modulation, serial data stream is transformed into parallel data stream through S/P converter unit 112.IFFT unit 114 makes the subcarrier mutually orthogonal of generation.Through P/S converter unit 116 parallel data is transformed into after the serial data, through the additional Cyclic Prefix that is used to reduce multi-path influence of 118 pairs of OFDM code elements of CP extra cell (cyclic prefix, CP).Before sending, digital signal conversion is become analog signal through D/A converter unit 120.Through after the various processing of each dispensing device chain, each signal becomes the state that can send through the transmitting antenna 122 that is distributed separately.
In the receiving system 200; Reception signal from reception antenna 202 is carried out the processing opposite with above-mentioned processing; That is, from the conversion (A/D converter unit 204) of analog to digital, the removal of Cyclic Prefix (CP removes unit 206), serial parallel transformation (S/P converter unit 208), high speed Fourier transform (FFT unit 210) and parallel serial conversion processing such as (P/S converter units 212).Form by signal overlap owing to receive signal, so need this Signal Separation is independently flowed for each from many transmitting antennas.At this moment, use V-BLAST decoding unit 214 in order to realize this function, this V-BLAST decoding unit use and compel zero (zero forcing, ZF) or Minimum Mean Square Error (minimum mean square error MMSE) waits technology.
Then, after separating processing such as mapping (separating map unit 216), deinterleaving (deinterleaving unit 218) and decoding (decoding unit 220), CRC (CRC processing unit 222) is carried out in each grouping handle, confirmed thus whether these data are accurate.Be free from mistakes if judge detected grouping, then affirmative acknowledgement (ACK) sent to dispensing device, dispensing device does not carry out the re-transmission of this grouping.If there is mistake, then negative response (NACK) is sent to dispensing device 100, with request retransmission.
Fig. 3 is transmission ARQ control unit of the present invention and the functional-block diagram that receives the ARQ control unit.
As shown in Figure 3, each antenna chains has special-purpose CRC extra cell 302 respectively.Therefore, in the ARQ control unit 316 of receiving system, through CRC processing unit 318 to each independently any packet of reception antenna chain CRC of being used for error detection handle.Then, the ACK/NACK output unit 320 of receiving system via high speed ARQ feedback channel 322, is given a plurality of ACK/NACK receiving elements 308 in the ARQ control unit 306 of dispensing device with the ARQ feedback information of relevant each data flow.The advantage of said structure is: do not need when detecting mistake by all antenna data retransmissions.Only there is the data flow of damage to need to retransmit.Because the possibility that all data flow are all made mistakes is very low, therefore, this sending method improves data throughout.
Error data stream detecting unit 310 need to confirm the data flow of re-transmission according to the ARQ information that obtains through ACK/NACK receiving element 308.And then, the statistics of the ARQ that carries out between error data stream detecting unit 310 storage longer-terms, the average time of the re-transmission that promptly takes place at specific transmitting antenna.This information is used for the multistage modulation and the encoding process of AMC unit 304.For example, in the ARQ statistics between longer-term, if the number of retransmissions of certain root transmitting antenna lacks than other transmitting antenna relatively, then to the modulation of this transmitting antenna setting high-order.Relative therewith, to retransmitting, set the modulation of low order often in the antenna of other antenna.
When needing to retransmit, retransmit mode selecting unit 312 and carry out decision process, to select to be used in the suitable mode of data re-transmission.Then, upgrade transmission buffer cell 314 according to this decision.
Fig. 4 to Fig. 7 is the example of the setting scheme of four kinds of different repeating methods proposing in according to the present invention of expression.The whole bag of tricks at length is described below.Every kind of method is suitable for a kind of in the combination of mutually different system requirements.Therefore, performed method is to make the maximum method of the optimized possibility of systematic function according to customer requirements.
The example that the transmit status of the last time of Fig. 4 and Fig. 5 method for expressing I and method II and current re-transmission are set.Above-mentioned two kinds of methods are the re-transmission that flows to line data to damaging only, and the antenna that is not used to simultaneously retransmit sends new data.The advantage of these methods is: even also can send new data incessantly when retransmitting.Therefore, can keep the data rate of constant level and need not sacrifice requirement accuracy.
As shown in Figure 4, one embodiment of the present of invention are sent respectively through every transmitting antenna and are divided into groups 1 to 4.According to ACK and the nack message from receiving system, determining grouping 2 has mistake with grouping 4.When retransmitting, use with last and send identical antenna and send the data that will retransmit according to method I, promptly divide into groups 2 with grouping 4.Use not by the new data of the antenna transmission of request retransmission.
When retransmitting, do not use with last and send identical antenna, and use the antenna of in last once transmission, not makeing mistakes to send the data that will retransmit according to method II.Use is regarded as the high antenna of reliability and sends the data that will retransmit, so can further improve the possibility that the data of re-transmission are not made mistakes, can improve the accuracy of data thus.Especially slowly perhaps be in the static stable environment in decline, can adopt such hypothesis: if receive ACK through specific antenna, then the reliability of this antenna is higher.
The difference of above-mentioned two kinds of methods is the distribution of antenna.According to the method I that does not distribute, because the processing of data is limited to minimum degree, so reduced complexity.Therefore, the processing delay of this moment can be shorter.According to method II, because the setting of data changes, so will transmitting terminal and receiving terminal both sides' buffer cell be taken in.Dispensing device needs and will notify to receiving system with the difference in the preceding setting of once sending with this transmission, so that upgrade buffer cell exactly.In addition, stipulate the notice between this device by the upper strata.Seek among this method II and improve the accuracy that retransmits, so that reduce the required number of retransmissions of Frame.
Method I and method II are suitable for allowing to take place the system of mistake.In such system, the requirement of sending mass data at short notice has precedence over correctness.As several examples of this purposes, can enumerate video flowing (streaming) and fax.In addition, I compares with method, and method II is more suitable in the system that does not allow to postpone.
On the other hand, when system did not allow mistake takes place, method III and method IV were more suitable.At this moment, obtain appropriate accuracy and be regarded as override.As such purposes, reading, Email reception and the instant message that can enumerate ecommerce, webpage send (Instant Messaging) and wait other dialog mode service.
The example that the transmit status of the last time of Fig. 6 and Fig. 7 method for expressing III and method IV and current re-transmission are set.The space-time block encoding (STBC) of usage space diversity technique carries out the re-transmission of data, so that improve the accuracy of data retransmission.In these two kinds of methods, the transmission of new data does not take place with the re-transmission of data simultaneously.Antenna only is used for this purpose during by request retransmission.
In an alternative embodiment of the invention, as shown in Figure 6, the antenna that dependability is high (receiving the antenna of ACK in relevant last the transmission) carries out the re-transmission of packet according to method III.Other antenna does not send.
Among another embodiment according to method IV, use all spendable antennas, and use STBC to send the data that will retransmit.Therefore, the possibility of receiving system end generation mistake can reduce greatly.
According to this two kinds of method III and IV, retransmit in the present embodiment of two data groupings at needs, in the first time slot retransmission packet 2, and in next time slot retransmission packet 4.Be to use the more modulation of high-order as one of method of raising the efficiency, so that the raising of data retransmission speed becomes possibility.If adopt above-mentioned solution, can in identical moment, send more data retransmission.
IV is different with method, and method III is intended to shorten the required time of the processing in the receiving system.Owing to use transmitting antenna still less, can make the decoding processing of STBC become simple and accelerate the decoding processing of STBC.And then method III retransmits through the high antenna of dependability, seeks the balance between complexity and the accuracy.Though method IV is more complicated and need the more processing time, compares with method III and can access higher re-transmission accuracy, therefore be suitable for not allowing mistake takes place but the system that can allow to postpone.
One of the present invention is characterized as and can changes method selected according to the re-transmission of carrying out.It is former because changing can appear after certain number of times has been sent in identical grouping in system requirements sometimes.For example, suppose to allow system of selection I of system or method II that mistake takes place to be used for retransmitting.But after re-transmission several times, identical grouping still makes mistakes.So, retransmit mode selecting unit 312 and can determine to be method III or method IV more accurately, so that improve the accuracy of this grouping.In addition, stipulate the switching command of repeating method by the upper strata.
As the distortion of the foregoing description, can adopt the ARQ that uses incremental redundancy to replace simple tracking to merge.The packets of information of incremental redundancy is contained in the grouping of re-transmission and sends, so that in decoding processing, further improve performance.
Another distortion as the foregoing description can change the interlace mode that is used to retransmit.Each OFDM subcarrier might run into different declines.When having channel condition information (CSI), can carry out bit and load (bit loading) processing.When the dispensing device end can not get CSI, the present invention adopted equivalent bit to load (equal bit loading) and handles.In each the re-transmission, change interlace mode and make the influence of decline keep balance, so that utilize the decline between subcarrier poor.
As another distortion of the foregoing description, can make up with the present invention and use Adaptive Modulation, coding and power control.The information that is obtained by the statistics of the ARQ between longer-term helps to confirm the high antenna of reliability.It is higher that the average lower antenna of retransmission rate can be regarded as reliability.Can use more modulation of high-order or higher encoding rate to such antenna.Relative therewith, higher power is provided can for other antenna, so that improve signal strength signal intensity.Because the processing less complex of the difference of determined link quality and not needing for a long time is effectively so in link adaptation techniques, use the statistics of ARQ to replace the method for CSI in the past.
Although can being regarded as the preferred embodiments of the present invention, above explanation shows; But the present invention is not limited to the foregoing description of being proposed; And can realize that therefore, scope of the present invention should decide with reference to accompanying claims and equivalent thereof with various execution modes and embodiment.
Industrial applicibility
The present invention is suitable for using in multiple-input and multiple-output (MIMO) communication system of OFDM (OFDM).
Claims (11)
1. the repeating method of the automatic repeat requests of a dispensing device multiple-input-multiple-output communication system that is used for using OFDM, that communicate with receiving system comprises:
Receiving step receives the result's be based on the CRC that said receiving system carries out the affirmative acknowledgement or the feedback information of negative response; And
Select to retransmit the model selection step; According to said feedback information; Use first pattern and the usage space diversity technique of other other data of antenna transmission to send second pattern of data from using antenna transmission data simultaneously, select the re-transmission pattern of data-signal.
One kind be used for using OFDM multiple-input-multiple-output communication system, that utilize automatic repeat requests control, with the dispensing device that receiving system communicates, comprising:
Receiving element receives the result's be based on the CRC that said receiving system carries out the affirmative acknowledgement or the feedback information of negative response; And
Select to retransmit mode selecting unit; According to said feedback information; Use first pattern and the usage space diversity technique of other other data of antenna transmission to send second pattern of data from using antenna transmission data simultaneously, select the re-transmission pattern of data-signal.
3. dispensing device as claimed in claim 2 also comprises:
The AMC unit carries out link circuit self-adapting based on said feedback information and handles.
4. dispensing device as claimed in claim 3, wherein, said link circuit self-adapting is handled the adaptive modulation and coding method of using.
5. dispensing device as claimed in claim 3, wherein, said link circuit self-adapting is handled based on the number of wanting retransmission data.
6. dispensing device as claimed in claim 2, wherein, said space diversity reception to communicate is the space-time block encoding.
7. dispensing device as claimed in claim 2 wherein, in said first pattern, uses with the identical antenna of last transmission and sends the data that will retransmit.
8. dispensing device as claimed in claim 2, wherein, in said first pattern, said other data be the new data of not sending in last the transmission and use not by request retransmission to retransmit said other antennas of data send.
9. dispensing device as claimed in claim 2, wherein, the The data that retransmit is than the last more modulation of high-order of data of sending.
10. dispensing device as claimed in claim 2 wherein, uses the interlace mode different with the last employed interlace mode of data that sends to retransmit the data that will retransmit.
11. communication system multiple-input-multiple-output communication system, that utilize automatic repeat requests control that is used for using OFDM comprises receiving system and dispensing device:
Receiving system has:
The CRC processing unit carries out CRC for the data that receive from said dispensing device; And
The acknowledgement/non-acknowledgement output unit according to the result of said CRC, generates the feedback information of affirmative acknowledgement or negative response, and said feedback information is sent to said dispensing device;
Said dispensing device has:
Receiving element receives the feedback information of said affirmative acknowledgement or said negative response from said receiving system; And
Retransmit mode selecting unit; According to said feedback information; Use first pattern and the usage space diversity technique of other other data of antenna transmission to send second pattern of data from using antenna transmission data simultaneously, select the re-transmission pattern of data-signal.
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| CN2012100886899A CN102611543A (en) | 2004-09-13 | 2004-09-13 | Retransmission method, transmitting device and communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112566081A (en) * | 2018-02-09 | 2021-03-26 | 南京中感微电子有限公司 | Bluetooth multichannel receiving method, system and electronic equipment |
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| US20030067890A1 (en) * | 2001-10-10 | 2003-04-10 | Sandesh Goel | System and method for providing automatic re-transmission of wirelessly transmitted information |
| US20040057530A1 (en) * | 2002-09-20 | 2004-03-25 | Nortel Networks Limited | Incremental redundancy with space-time codes |
| US20050031050A1 (en) * | 2003-05-29 | 2005-02-10 | Noh-Sun Kim | Apparatus and method for transmitting/receiving data using a multiple antenna diversity scheme in a mobile communication system |
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| US20030067890A1 (en) * | 2001-10-10 | 2003-04-10 | Sandesh Goel | System and method for providing automatic re-transmission of wirelessly transmitted information |
| US20040057530A1 (en) * | 2002-09-20 | 2004-03-25 | Nortel Networks Limited | Incremental redundancy with space-time codes |
| US20050031050A1 (en) * | 2003-05-29 | 2005-02-10 | Noh-Sun Kim | Apparatus and method for transmitting/receiving data using a multiple antenna diversity scheme in a mobile communication system |
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| CN112566081A (en) * | 2018-02-09 | 2021-03-26 | 南京中感微电子有限公司 | Bluetooth multichannel receiving method, system and electronic equipment |
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Application publication date: 20120725 |