CN101729213B - Data communication method, data communication device and data communication system - Google Patents
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Abstract
The invention provides a data communication method, a data communication device and a data communication system, which aim to further improve resource utilization efficiency in data signal transmission between a data relay device and a data receiving device. The technical scheme of the method mainly comprises the following steps: receiving a plurality of signals transmitted by a data transmitting device; decoding the plurality of signals to obtain correctly decoded signals; receiving a message indicating data signals not decoded correctly by the data receiving device; and transmitting a part of the data signals in the correctly decoded signals transmitted to the data receiving device, wherein the part of the data signals is a part of the data signals not decoded correctly. The method has the advantages of improving data signal transmission performance and saving transmission resource from the data relay device to the data receiving device.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of data communications method, Apparatus and system.
Background technology
Along with the development of communications field data transmission technology, relaying (Relay) technology has appearred, relaying technique is to improve cell capacity and improve a kind of technology that community covers for cellular communication system.The basic principle of Relay technology is by lay relay station (RS in community, Relay Station), utilize RS forwarding Cell Edge User and data sending apparatus as base station (BS, Base Station) the signal transmission between, thereby improve the link-quality of Cell Edge User, the place that can make community originally not cover on the one hand covers by RS, reach and enlarge the effect that community covers, on the other hand, also can improve the efficiency of transmission of Cell Edge User, reach the effect that improves cell capacity.Take descending relay transmission as example, in real system, data sink is as mobile radio station (MS, mobile station) can receive only the signal from RS, also can jointly receive from the data-signal of BS and the signal of RS transmission, and MS can also merge to the signal sent between BS and RS reception.At first BS sends downlink data signal to MS and RS, then RS will receive again and the correct data-signal of decoding be transferred to MS, last MS merges reception to the signal from BS and RS, reaches receptivity preferably.
Multiple-input, multiple-output (MIMO, Multiple Input Multiple Output) technology is also the focus in wireless communication technology research at present, in various Novel movable communication systems, all adopts the MIMO technology to improve the spectrum efficiency of system.The MIMO technology can increase the Spatial Dimension of data-reusing, makes many piece of data spatial reuse to identical running time-frequency resource, also can, with sending same data-signal on a plurality of antennas and/or receiving same data with a plurality of reception antennas, obtain space diversity gain.Typical space diversity reception to communicate comprises Alamouti Space-Time Block Coding (STBC, Space Time Block Coding), and typical space multiplexing technique technology (V-BLAST, Vertical Bell LabsLayered Space Time) while comprising the Bell Laboratory vertical layered space.Usually, the data-signal of the upper emission of each transmitting antenna in mimo system (or equivalent transmitting antenna) is called to one deck (Layer), while using the V-BLAST data sink, receiving terminal can successively be received and be processed signal, then carry out symbol level using the data-signal after reception & disposal as known data-signal and disturb elimination, then separate successively the data-signal of each layer of back.On the other hand, can also be according in a MIMO transmission, using one or more encoding blocks that the MIMO technology is divided into to single codeword (SCW, Single Codeword) and many code word (MCW, Multi-Codeword) form, wherein the single codeword form refers to that each layer data signal of MIMO transmission is encoded to an encoding block together to be transmitted, and many form of codewords refer to that each layer data signal of MIMO transmission is divided into to a plurality of code words encodes separately, wherein the number of code word can be equal to or less than the number of plies, and the data-signal of a plurality of layers can be mapped to same code word.Especially, when using many code words technology, because each encoding block has independently cyclic redundancy check (CRC) (CRC, Cyclic Redundancy Check) verification, the successive interference cancellation techniques that can carry out the code word level improves receptivity, and each code word of decoding successively is correct and by the code word of CRC check to decoding, the known data-signal of the data-signal that it is passed on equivalent layer disturbs elimination, then separates successively the data-signal of each code word of back.Use the data-signal through CRC check can not bring error diffusion, thereby make the MCW that uses serial interference elimination to receive there is good receptivity.
The existing relay transmission method for mimo system is: BS at first data signal to MS and RS, if MS can not be correctly decoded after receiving, the data-signal that will correctly be received by RS is transmitted to MS, by MS, the data-signal received from BS and RS respectively for twice is merged, if the MIMO of single codeword form transmission, RS forwards the data-signal of whole code word, and MS carries out bit-level log-likelihood ratio (LLR, Log-Likelihood Ratio) to twice reception and merges or the data-signal after the MIMO linear equalization carried out to the reception & disposal such as high specific merging.If the MIMO of many form of codewords transmission, the data-signal of a plurality of code words is processed separately, the data-signal of all code words that could not be correctly decoded MS, if RS correctly receives, by RS, forwarded, and MS merges respectively reception to the data-signal of each code word of receiving for twice.Especially, if, when above MIMO relay system transmits for BroadCast MultiCast Service, RS forwards the data-signal that all receptions are correct, and no matter whether MS has correctly received data-signal from the BS there.
Because RS can not sent to MS by the correct data-signal received of MS by all, such scheme is as not high as the utilization ratio of the transfer resource of MS to data sink as RS to the data relay.
Summary of the invention
The invention provides a kind of data communications method, Apparatus and system, the technical scheme of using the embodiment of the present invention to provide, can improve the performance of data-signal transmission, saves the transfer resource of data relay device to data sink.
The purpose of the embodiment of the present invention is achieved through the following technical solutions:
The embodiment of the present invention provides a kind of data communications method, comprising:
Receive a plurality of signals that data sending apparatus sends;
Described a plurality of signals are decoded, obtained the signal be correctly decoded;
Receive the message of indicating the data-signal be not correctly decoded by data sink;
Send the partial data signal in the described signal be correctly decoded to described data sink, described partial data signal is the part of the described data-signal be not correctly decoded.
The embodiment of the present invention provides another kind of data communications method, comprising:
Receive a plurality of signals that data sending apparatus sends;
Described a plurality of signals are decoded, obtained a plurality of data-signals;
Send the message of indicating the data-signal be not correctly decoded to data relay device;
Receive the partial data signal that described data relay device sends, described partial data signal is the partial data signal in the signal that is correctly decoded of described data relay device, and described partial data signal is the part of the described data-signal be not correctly decoded;
Described a plurality of data-signals and described partial data signal are merged to reception with successive interference cancellation techniques.The embodiment of the present invention also provides a kind of data relay device, comprising:
Signal receiving unit, a plurality of signals that send for receiving data sending apparatus;
Signal decoding unit, decoded for a plurality of signals that described signal receiving unit is received, and obtains the signal be correctly decoded;
The message sink unit, for receiving the message of the data-signal that indication is not correctly decoded by data sink;
Signal transmitting unit, for send the partial data signal of the described signal be correctly decoded to described data sink, described partial data signal is the part of the described data-signal be not correctly decoded by data sink.
The embodiment of the present invention also provides a kind of data sink, comprising:
Signal receiving unit, be used for receiving a plurality of signals of data sending apparatus transmission and the partial data signal that described data relay device sends, described partial data signal is the partial data signal in the signal that is correctly decoded of described data relay device, and described partial data signal is the part of the described data-signal be not correctly decoded;
Signal decoding unit, decoded for described a plurality of signals that described signal receiving unit is received, and obtains a plurality of data-signals;
Message sending unit, for sending the message of indicating the data-signal be not correctly decoded to data relay device;
Merge receiving element, for described a plurality of data-signals and the described partial data signal that described signal decoding unit is obtained, with successive interference cancellation techniques, merge reception.
The embodiment of the present invention also provides a kind of data communication system, comprising:
Data relay device, a plurality of signals that send for receiving data sending apparatus; Described a plurality of signals are decoded, obtained the signal be correctly decoded; Receive the message of indicating the data-signal be not correctly decoded by data sink; Send the partial data signal in the described signal be correctly decoded to described data sink, described partial data signal is the part of the described data-signal be not correctly decoded;
Data sink, a plurality of signals that send for receiving data sending apparatus; Described a plurality of signals are decoded, obtained a plurality of data-signals; Send the message of indicating the data-signal be not correctly decoded to data relay device; Receive the partial data signal that described data relay device sends; Described a plurality of data-signals and described partial data signal are merged to reception with successive interference cancellation techniques.
Receiving terminal use to disturb is eliminated data sink, and data relay device is as RS only forwards the data of segment space layer, can improve forwarded segment space layer data signal at data sink the receptivity as the MS place.Can reduce the error diffusion to other layers as the data-signal of distracter, perhaps RS only forwards the data-signal of the part code word the many code words that receive from BS, the interference of MS application code word level is eliminated, improve the Signal to Interference plus Noise Ratio of the data-signal of other code words, can improve the performance of whole MIMO transmission, thereby save data relay device, as RS, arrive the transfer resource of data sink as MS.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment mono-of data communications method in the embodiment of the present invention;
Fig. 2 is the schematic diagram of the embodiment bis-of data communications method in the embodiment of the present invention;
Fig. 3 is the schematic diagram of the embodiment of data relay device in the embodiment of the present invention;
Fig. 4 is the schematic diagram of the embodiment of data sink in the embodiment of the present invention;
Fig. 5 is the structural representation of the embodiment of data communication system in the embodiment of the present invention.
Embodiment
For make purpose of the present invention, technical scheme, and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
In the present invention, the embodiment of data communications method, just like shown in Fig. 1, comprising:
Step 101: data relay device receives a plurality of signals that data sending apparatus sends;
Step 102: data relay device is decoded to a plurality of signals, obtains the signal be correctly decoded;
Step 103: data relay device receives the message of indicating the data-signal be not correctly decoded by data sink;
Step 104: send the partial data signal in the described signal be correctly decoded to described data sink, described partial data signal is the part of the described data-signal be not correctly decoded.
Further, when a plurality of signals of data sending apparatus transmission send with the single codeword form, the step 104 that sends the partial data signal in the described signal be correctly decoded to described data sink specifically comprises:
The data-signal be correctly decoded to data sink transmitting portion space layer.
Further again, to the step of the data-signal be correctly decoded of data sink transmitting portion space layer, specifically comprise:
Utilize space diversity or the space multiplexing technique data-signal be correctly decoded to data sink transmitting portion space layer.
The example detailed annotation of single codeword form is as follows:
BS sends to MS and RS by data-signal, and wherein RS is correctly decoded, and MS is not correctly decoded, decode whole code word by after CRC check of RS, recompile modulation, the data-signal on the segment space layer when only forwarding BS and being transferred to MS.MS is combined reception to the data-signal from BS and RS received.
Take two antennas as example,
MIMO mode from BS to MS can be expressed as:
H wherein
BS-MSFor BS to the 2x2 transmission channel between MS, s
1And s
2Be respectively the data-signal that on two transmit antennas, emission is sent out, Y
BS-MSFor the signal phasor that MS receives, N
BS-MSThe noise vector received for MS.
RS can be expressed as to the MIMO mode of MS:
H wherein
RS-MS2 * 1 transmission channels while for RS, using a transmit antennas emission between RS and MS, s
1For the data-signal on selected transmitting antenna (with the s in formula 1
1For same data-signal), Y
RS-MSFor the signal phasor that MS receives, N
RS-MSThe noise vector received for MS.
Formula (2) can be transformed to:
MS can adopt following methods to be received: by (1) formula and (3) formula simultaneous:
To sum up, in brief, be to send s as BS to MS
1, s
2, BS also sends s to RS simultaneously
1, s
2, for example, RS is to s
1, s
2Be correctly decoded, but MS is not to s
1, s
2Be correctly decoded, MS can be by the data-signal s be not correctly decoded
1, s
2Message send to RS, RS sends the signal s be correctly decoded by RS to MS
1, s
2In the partial data signal as data-signal s
1, obviously, data-signal s
1Also the data-signal s be not correctly decoded by MS
1, s
2In a part, due to symbol s
1Be transmitted twice, the signal to noise ratio of receiving terminal is higher, so MS can first estimate s
1, then by s
1Estimation as known disturbances, eliminated after, then estimate s
2, finally according to s
1And s
2Estimation carry out demodulation, decoding.
On the basis of embodiment 1, RS can also be used the diversity radiation patterns such as STBC/SFBC, CDD during to MS forwarding data signal, and the present embodiment be take STBC/SFBC as example.
MIMO mode from BS to MS can be expressed as:
Or be equivalent to:
H wherein
BS-MSFor BS to 2 * 2 transmission channels between MS, s
1And s
2Be respectively the data-signal on two transmit antennas on the first running time-frequency resource, s
3And s
4Be respectively the data-signal on two transmit antennas on the second running time-frequency resource, Y
BS-MSFirst row and secondary series be respectively the signal phasor that MS receives on the first running time-frequency resource and the second running time-frequency resource, N
BS-MSFirst row and secondary series be respectively the noise vector that MS receives on the first running time-frequency resource and the second running time-frequency resource.
RS can be expressed as to the MIMO mode of MS:
Or be equivalent to:
H wherein
RS-MSFor 2 * 2 transmission channels between RS and MS, at the first running time-frequency resource, two transmitting antennas of RS send respectively data-signal s
1And s
3, at the second running time-frequency resource, two transmit antennas of RS send respectively
With
Y
RS-MSFirst row and secondary series be respectively the signal phasor that MS receives at the first running time-frequency resource and the second running time-frequency resource, N
RS-MSFirst row and secondary series be respectively the noise vector that MS receives on the first running time-frequency resource and the second running time-frequency resource.
MS can adopt the merging method of MIMO MRC to be merged twice reception:
(9)
To sum up, in brief, be to send s as BS to MS
1, s
2And s
3, s
4, BS also sends s to RS simultaneously
1, s
2And s
3, s
4, for example, RS is to s
1, s
2And s
3Be correctly decoded, but MS is not to s
1, s
2And s
3Be correctly decoded, MS can be by the data-signal s be not correctly decoded
1, s
2And s
3Message send to RS, RS sends the signal s be correctly decoded by RS to MS
1, s
2And s
3In the partial data signal as data-signal s
1And s
3, obviously, data-signal s
1And s
3Also the data-signal s be not correctly decoded by MS
1, s
2And s
3In a part, due to data-signal s
1And s
3Be transmitted twice, the signal to noise ratio of receiving terminal is higher, so MS can first estimate s
1And s
3, then by s
1And s
3Estimation as known disturbances, eliminated after, then estimate s
2And s
4, finally according to s
1, s
2And s
3, s
4Estimation carry out demodulation, decoding.Further, a plurality of signals that send when data sending apparatus are while sending with many form of codewords, and the step 104 that sends the partial data signal in the described a plurality of data-signals that are correctly decoded to described data sink specifically comprises:
Data relay device is to the data-signal be correctly decoded of data sink transmitting portion code word.Further, data relay device is utilized space diversity or the space multiplexing technique data-signal be correctly decoded to data sink transmitting portion code word.
The example detailed annotation of many form of codewords is as follows:
BS sends to MS and RS by the data of a plurality of code words, and MS does not correctly receive a plurality of code words wherein, and RS has correctly received all code words that MS does not correctly receive, RS each code word of decoding, for by each code word of CRC check, select wherein one or more code words, recompile is modulated and is forwarded.MS is combined reception to the data-signal from BS and RS received.
42 receipts of take are example,
BS transmits first and uses the D-STTD pattern to divide two code words to be sent, and BS can be expressed as to the mode of MS:
Or be equivalent to:
H wherein
BS-MSFor 2 * 4 transmission channels between BS and MS, at the first running time-frequency resource, 4 transmitting antennas of BS send respectively data-signal s
1, s
2And s
3, s
4, at the second running time-frequency resource, two transmit antennas of RS send respectively
With
Y
BS-MSFirst row and secondary series be respectively the signal phasor that MS receives at the first running time-frequency resource and the second running time-frequency resource, N
BS-MSFirst row and secondary series be respectively the noise vector that MS receives on the first running time-frequency resource and the second running time-frequency resource." s wherein
1, s
2" from a code word, and " s
3, s
4" from another code word
And RS supposes that RS at least can be correctly decoded a code word, for example " s while forwarding to MS
1, s
2", RS can only forward a code word, and RS is specially to the signal model of MS:
Or be equivalent to:
H wherein
RS-MSFor 2 * 2 transmission channels between RS and MS, at the first running time-frequency resource, two transmitting antennas of RS send respectively data-signal s
1And s
2, at the second running time-frequency resource, two transmit antennas of RS send respectively
With
Y
RS-MSFirst row and secondary series be respectively the signal phasor that MS receives at the first running time-frequency resource and the second running time-frequency resource, N
RS-MSFirst row and secondary series be respectively the noise vector that MS receives on the first running time-frequency resource and the second running time-frequency resource.
MS can adopt with embodiment 1 or embodiment 2 in MIMO merging method received, due to s
1And s
2Corresponding character signal energy is larger, so the MS s that can first decode
1And s
2Corresponding code word, if can pass through CRC check after decoding, by decoded bit recompile modulation, after being eliminated as known disturbances, then the s that decodes
3And s
4Corresponding code word.
In the embodiment mono-of above-mentioned data communications method, data relay device only forwards the data-signal be correctly decoded of segment space layer as RS, the part in this data-signal data-signal that to be data sink be not correctly decoded as MS.Can improve forwarded segment space layer data signal at data sink the receptivity as the MS place.Can reduce the error diffusion to other layers as the data-signal of distracter.Perhaps RS only forwards the data-signal of the part code word from many code words that BS receives, in like manner, and the part in this data-signal data-signal that to be only data sink be not correctly decoded as MS yet.The interference of MS application code word level is eliminated, and improves the Signal to Interference plus Noise Ratio of the data-signal of other code words, can improve the performance of whole MIMO transmission, thereby save data relay device, as RS, arrives the transfer resource of data sink as MS.
In the present invention, the embodiment bis-of data communications method as shown in Figure 2, comprising:
Step 201: receive a plurality of signals that data sending apparatus sends;
Step 202: described a plurality of signals are decoded, obtain a plurality of data-signals;
Step 203: send the message of indicating the data-signal be not correctly decoded to data relay device;
Step 204: receive the partial data signal that described data relay device sends, described partial data signal is the partial data signal in the signal that is correctly decoded of described data relay device, and described partial data signal is the part of the described data-signal be not correctly decoded;
Step 205: described a plurality of data-signals and described partial data signal are merged to reception with successive interference cancellation techniques.
In the embodiment bis-of above-mentioned data communications method, data relay device only forwards the data-signal be correctly decoded of segment space layer as RS, the part in this data-signal data-signal that to be data sink be not correctly decoded as MS.Can improve forwarded segment space layer data signal at data sink the receptivity as the MS place.Can reduce the error diffusion to other layers as the data-signal of distracter, perhaps RS only forwards the data-signal of the part code word the many code words that receive from BS, in like manner, the part in this data-signal data-signal that to be only data sink be not correctly decoded as MS yet.The interference of MS application code word level is eliminated, and improves the Signal to Interference plus Noise Ratio of the data-signal of other code words, can improve the performance of whole MIMO transmission, thereby save data relay device, as RS, arrives the transfer resource of data sink as MS.
In the present invention, the embodiment of data relay device as shown in Figure 3, comprising:
Signal receiving unit 301, a plurality of signals that send for receiving data sending apparatus;
Signal transmitting unit 304, for send the partial data signal of the described signal be correctly decoded to described data sink, described partial data signal is the part of the described data-signal be not correctly decoded by data sink.
Further, when a plurality of signals of signal receiving unit 301 receptions are the single codeword form, signal transmitting unit 304 is specifically for the data-signal be correctly decoded of the segment space layer to 302 acquisitions of data sink transmitted signal decoding unit.
Further again, signal transmitting unit 304 is specifically for utilizing space diversity or the space multiplexing technique data-signal be correctly decoded to the segment space layer of data sink transmitted signal decoding unit 302 acquisitions.
Further, when a plurality of signals of signal receiving unit 301 receptions are many form of codewords, signal transmitting unit 304 is specifically for the data-signal be correctly decoded of the part code word to 302 acquisitions of data sink transmitted signal decoding unit.The data-signal be correctly decoded of the part code word that described signal transmitting unit 304 specifically can utilize space diversity or space multiplexing technique to obtain to data sink transmitted signal decoding unit 302.
In the embodiment of above-mentioned data relay device, data relay device only forwards the data-signal be correctly decoded of segment space layer as RS, the part in this data-signal data-signal that to be data sink be not correctly decoded as MS.Can improve forwarded segment space layer data signal at data sink the receptivity as the MS place.Can reduce the error diffusion to other layers as the data-signal of distracter, perhaps RS only forwards the data-signal of the part code word the many code words that receive from BS, in like manner, the part in this data-signal data-signal that to be only data sink be not correctly decoded as MS yet.The interference of MS application code word level is eliminated, and improves the Signal to Interference plus Noise Ratio of the data-signal of other code words, can improve the performance of whole MIMO transmission, thereby save data relay device, as RS, arrives the transfer resource of data sink as MS.
In the present invention, the embodiment of data sink as shown in Figure 4, comprising:
Signal receiving unit 401, the partial data signal sent for receiving a plurality of signals that data sending apparatus sends and described data relay device, described partial data signal is the partial data signal in a plurality of data-signals of being correctly decoded of described data relay device;
Merge receiving element 404, for a plurality of data-signals and the described partial data signal that described signal decoding unit 402 is obtained, with successive interference cancellation techniques, merge reception.
In the embodiment of above-mentioned data sink, data relay device only forwards the data-signal be correctly decoded of segment space layer as RS, the part in this data-signal data-signal that to be data sink be not correctly decoded as MS.Can improve forwarded segment space layer data signal at data sink the receptivity as the MS place.Can reduce the error diffusion to other layers as the data-signal of distracter, perhaps RS only forwards the data-signal of the part code word the many code words that receive from BS, in like manner, the part in this data-signal data-signal that to be only data sink be not correctly decoded as MS yet.The interference of MS application code word level is eliminated, and improves the Signal to Interference plus Noise Ratio of the data-signal of other code words, can improve the performance of whole MIMO transmission, thereby save data relay device, as RS, arrives the transfer resource of data sink as MS.
In the present invention, the embodiment of data communication system as shown in Figure 5, comprising:
Data relay device 501, a plurality of signals that send for receiving data sending apparatus; Described a plurality of signals are decoded, obtained the signal be correctly decoded; Receive the message of indicating the data-signal be not correctly decoded by data sink 502; The partial data signal sent in the described signal be correctly decoded to described data sink 502, described partial data signal is the part of the described data-signal be not correctly decoded.
Data sink 502, a plurality of signals that send for receiving data sending apparatus; Described a plurality of signals are decoded, obtained a plurality of data-signals; Send the message of indicating the data-signal be not correctly decoded to data relay device 501; Receive the partial data signal that described data relay device 501 sends, described partial data signal is the partial data signal in the signal that is correctly decoded of described data relay device 501, and described partial data signal is the part of the described data-signal be not correctly decoded; The described partial data signal of described a plurality of data-signals is merged to reception with successive interference cancellation techniques.
Further, in data communication system, can also comprise data sending apparatus, for to described data relay device and data sink, sending a plurality of signals.
In the embodiment of above-mentioned data communication system, data relay device only forwards the data-signal be correctly decoded of segment space layer as RS, the part in this data-signal data-signal that to be data sink be not correctly decoded as MS.Can improve forwarded segment space layer data signal at data sink the receptivity as the MS place.Can reduce the error diffusion to other layers as the data-signal of distracter, perhaps RS only forwards the data-signal of the part code word the many code words that receive from BS, in like manner, the part in this data-signal data-signal that to be only data sink be not correctly decoded as MS yet.The interference of MS application code word level is eliminated, and improves the Signal to Interference plus Noise Ratio of the data-signal of other code words, can improve the performance of whole MIMO transmission, thereby save data relay device, as RS, arrives the transfer resource of data sink as MS.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is to come the hardware that instruction is relevant to complete by program, program can be stored in a kind of computer-readable recording medium, storage medium can be read-only memory, disk or CD etc.
Above a kind of data communications method, the Apparatus and system that the embodiment of the present invention is provided is described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, to sum up, this description should not be construed as limitation of the present invention simultaneously.
Claims (14)
1. a data communications method, is characterized in that, comprising:
Data relay device receives a plurality of signals that data sending apparatus sends;
Data relay device is decoded to described a plurality of signals, obtains the signal be correctly decoded;
Data relay device receives the message of indicating the data-signal be not correctly decoded by data sink;
Data relay device sends the partial data signal in the described signal be correctly decoded to described data sink, and the described data-signal be not correctly decoded by data sink comprises described partial data signal.
2. data communications method according to claim 1, it is characterized in that, when a plurality of signals of described data sending apparatus transmission send with the single codeword form, the step that sends the partial data signal in the described signal be correctly decoded to described data sink specifically comprises:
The data-signal be correctly decoded to described data sink transmitting portion space layer.
3. data communications method according to claim 2, is characterized in that, to the step of the data-signal be correctly decoded of described data sink transmitting portion space layer, specifically comprises:
Utilize space diversity or the space multiplexing technique data-signal be correctly decoded to described data sink transmitting portion space layer.
4. data communications method according to claim 1, it is characterized in that, a plurality of signals that send when described data sending apparatus are while sending with many form of codewords, and the step that sends the partial data signal in the described signal be correctly decoded to described data sink specifically comprises:
The data-signal be correctly decoded to described data sink transmitting portion code word.
5. data communications method according to claim 4, is characterized in that, to the step of the data-signal be correctly decoded of described data sink transmitting portion code word, specifically comprises:
Utilize space diversity or the space multiplexing technique data-signal be correctly decoded to described data sink transmitting portion code word.
6. a data communications method, is characterized in that, comprising:
Data sink receives a plurality of signals that data sending apparatus sends;
Data sink is decoded to described a plurality of signals, obtains a plurality of data-signals;
Data sink sends the message of indicating the data-signal be not correctly decoded to data relay device:
Data sink receives partial data signal in the signal be correctly decoded that described data relay device sends, and the described data-signal be not correctly decoded by data sink comprises described partial data signal;
Data sink merges reception by described a plurality of data-signals and described partial data signal with successive interference cancellation techniques.
7. a data relay device, is characterized in that, comprising:
Signal receiving unit, a plurality of signals that send for receiving data sending apparatus;
Signal decoding unit, decoded for a plurality of signals that described signal receiving unit is received, and obtains the signal be correctly decoded;
The message sink unit, for receiving the message of the data-signal that indication is not correctly decoded by data sink:
Signal transmitting unit, for send the partial data signal of the described signal be correctly decoded to described data sink, the described data-signal be not correctly decoded by data sink comprises described partial data signal.
8. data relay device according to claim 7, it is characterized in that, when a plurality of signals that receive when signal receiving unit are the single codeword form, described signal transmitting unit is specifically for the data-signal be correctly decoded of the segment space layer that sends described signal decoding unit to described data sink and obtain.
9. data relay device according to claim 8, it is characterized in that, described signal transmitting unit is specifically for utilizing space diversity or space multiplexing technique to send the data-signal be correctly decoded of the segment space layer of described signal decoding unit acquisition to described data sink.
10. data relay device according to claim 7, it is characterized in that, when a plurality of signals that receive when signal receiving unit are many form of codewords, described signal transmitting unit is specifically for the data-signal be correctly decoded of the part code word that sends described signal decoding unit to described data sink and obtain.
11. data relay device according to claim 10, it is characterized in that, described signal transmitting unit is specifically for utilizing space diversity or space multiplexing technique to send the data-signal be correctly decoded of the part code word of described signal decoding unit acquisition to described data sink.
12. a data sink, is characterized in that, comprising:
Signal receiving unit, for receiving the partial data signal of the signal be correctly decoded that a plurality of signals that data sending apparatus sends and data relay device send, the data-signal be not correctly decoded by data sink comprises described partial data signal;
Signal decoding unit, decoded for described a plurality of signals that described signal receiving unit is received, and obtains a plurality of data-signals;
Message sending unit, for sending the message of indicating the data-signal be not correctly decoded to data relay device;
Merge receiving element, for described a plurality of data-signals and the described partial data signal that described signal decoding unit is obtained, with successive interference cancellation techniques, merge reception.
13. a data communication system, is characterized in that, comprising:
Data relay device, a plurality of signals that send for receiving data sending apparatus; Described a plurality of signals are decoded, obtained the signal be correctly decoded; Receive the message of indicating the data-signal be not correctly decoded by data sink; Send the partial data signal in the described signal be correctly decoded to described data sink;
Data sink, a plurality of signals that send for receiving data sending apparatus; Described a plurality of signals are decoded, obtained a plurality of data-signals; Send the message of indicating the data-signal be not correctly decoded to data relay device; Receive the partial data signal in the signal be correctly decoded that described data relay device sends, the described data-signal be not correctly decoded by data sink comprises described partial data signal; Described a plurality of data-signals and described partial data signal are merged to reception with successive interference cancellation techniques.
14. communication system according to claim 13, is characterized in that, described system also comprises:
Data sending apparatus, for sending a plurality of signals to described data relay device and described data sink.
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