CN101277165A - MIMO-MMSE-SIC-HARQ communication system - Google Patents
MIMO-MMSE-SIC-HARQ communication system Download PDFInfo
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- CN101277165A CN101277165A CNA2007100875412A CN200710087541A CN101277165A CN 101277165 A CN101277165 A CN 101277165A CN A2007100875412 A CNA2007100875412 A CN A2007100875412A CN 200710087541 A CN200710087541 A CN 200710087541A CN 101277165 A CN101277165 A CN 101277165A
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Abstract
The invention provides a MIMO-MMSE-SIC-HARQ communications system which includes an emitter and a receiver. The emitter includes an encoder modulator, the encoder modulator includes: a segmenting unit suitable for segmenting antenna data stream into two or more than two sub-data stream, a CRC encoder suitable for checking bit encoding and punching to the sub-data stream; an interleaver suitable for interweaving encoding data stream; a modulator. The receiver includes: a channel quality measurer suitable for measuring and calculating channel quality and obtaining channel quality experienced by each data stream in fact; a MMSE detector suitable for processing MMSE detection to data stream; a SIC detector suitable for processing SIC detection to data stream; a layered detector for processing layered detecting to data stream. Relative to prior MIMO-MMSE-SIC-HARQ communications system, the MIMO-MMSE-SIC-HARQ communications system provided by the invention can reduce operation complexity of whole receiver, improve detection error performance, and increase system capacity.
Description
Technical field
The present invention relates to the message transmission in the wireless communication system, particularly a kind of MIMO-MMSE-SIC-HARQ communication system, the scheme the when channel quality that is used for MCS scheme that data streams adopts and actual experience does not match is to improve power system capacity.
Background technology
Fig. 1 shows a kind of existing MIMO-MMSE-SIC-HARQ (multiple inputmultiple output-minimum mean square error-successiveinterference cancellation-hybrid automatic retransmissionrequest) communication system.MIMO-MMSE-SIC-HARQ communication system 100 comprises transmitter 102 and receiver 104.
The signal that receiver 104 receives many antennas is sent into MMSE detector 110.At first first transmitting antenna data flow transmitted is carried out MMSE and detect, also can at first carry out MMSE and detect second transmitting antenna data flow transmitted.Then, the data flow that MMSE detects is sent into demodulator decorder A (112), demodulator decorder A (112) adopts MCS1 that data stream is carried out demodulation coding and checks CRC.If CRC is correct, then will receive first correct transmitting antenna data flow transmitted and send into SIC detector 114 and carry out SIC and detect, SIC detector 114 dateouts flow to demodulator decorder B (116).Demodulator decorder B (116) adopts MCS2 that data are flow to row decoding and check CRC.If CRC is correct, then feed back the ack signal of two data flow, the CQI of the data flow of the CQI of the data flow that MMSE is detected and SIC detection feeds back to transmitter simultaneously.
If find crc error after first transmitting antenna data flow transmitted carried out MMSE detection and demodulation coding and check CRC, then immediately second transmitting antenna data flow transmitted carried out MMSE and detect and demodulation coding.If corresponding CRC is correct, then first transmitting antenna data flow transmitted is carried out SIC and detect and demodulation coding.If corresponding CRC is still correct, then feed back the ack signal of two data flow, the CQI of the data flow of the CQI of the data flow that MMSE is detected and SIC detection feeds back to transmitter simultaneously.
If find the equal mistake of CRC after two transmitting antenna data flow transmitted are carried out MMSE detection and demodulation coding respectively and checked CRC, then feed back the NACK signal of two data flow.
If find after a transmitting antenna data flow transmitted carried out MMSE detection and demodulation coding and check CRC that CRC is correct, and find crc error after another transmitting antenna data flow transmitted carried out SIC detection and demodulation coding and check CRC, then feed back the ack signal of correct data stream and the NACK signal of misdata stream.
In the prior art, according to fixed mode or select a transmitting antenna data flow transmitted at first to carry out MMSE detection, demodulation coding and check CRC disorderly, if crc error is again according to fixed mode or select second transmitting antenna data flow transmitted at first to carry out MMSE detection, demodulation coding and check CRC disorderly.Will bring the average treatment complexity of receiver bigger like this.
In the prior art, if find the equal mistake of CRC after two transmitting antenna data flow transmitted are carried out MMSE detection and demodulation coding respectively and checked CRC, then feed back the NACK signal of two data flow, if find after a transmitting antenna data flow transmitted carried out MMSE detection and demodulation coding and check CRC that CRC is correct, and find crc error after another transmitting antenna data flow transmitted carried out SIC detection and demodulation coding and check CRC, the NACK signal of feedback error data flow then.This method brings the loss of throughput very big.
Summary of the invention
Therefore, the invention provides a kind of MIMO-MMSE-SIC-HARQ communication system, wherein at first the transmitting antenna data flow transmitted is sorted, determine the order that MMSE detects, and the data flow of crc error is carried out part detect.
According to a kind of MIMO-MMSE-SIC-HARQ communication system of the present invention, comprise transmitter and receiver, wherein
Described transmitter comprises coding demodulator, and described coding demodulator comprises:
Segmenting unit, being suitable for transmitting antenna data flow point section is two or more sub data flows,
The CRC encoder is suitable for described sub data flow is carried out bit check code and punching;
Interleaver is suitable for encoded data stream is interweaved;
Modulator is suitable for getting identical or different number bits from each sub data flow that has interweaved respectively at every turn, by mapping, exports a modulation symbol;
Described receiver comprises:
The channel quality measurement device is suitable for measuring and the calculating channel quality, obtains the channel quality of the actual experience of each data flow;
The MMSE detector is suitable for that data stream is carried out MMSE and detects;
The SIC detector is suitable for that data stream is carried out SIC and detects;
The layering detector carries out layering to data stream and detects.
With respect to existing MIMO-MMSE-SIC-HARQ communication system, the present invention can reduce the computational complexity of whole receiver, improves the error performance that detects, and improves power system capacity simultaneously.
Description of drawings
Fig. 1 shows a kind of existing MIMO-MMSE-SIC-HARQ communication system;
Fig. 2 shows the block diagram according to the transmitter of MIMO-MMSE-SIC-HARQ communication system of the present invention;
Fig. 3 shows according to 16QAM modulation constellation of the present invention;
Fig. 4 shows the block diagram according to the receiver of MIMO-MMSE-SIC-HARQ communication system of the present invention.
Embodiment
Coding demodulator in the transmitter shown in Figure 11 (106) and coding demodulator 2 (108) are designed, as shown in Figure 2 according to transmitter coding modulator of the present invention.At first some transmitting antenna data stream is carried out segmentation 202 according to coding demodulator 200 of the present invention, the data flow that obtains after the segmentation 202 has two or more sub data flows.The length of each sub data flow can equate, also can be unequal, and be that example describes with two sub-streams here.
Interleaver 1 (208) can be identical with interleaver 2 (214), also can be different.The scheme of the encoder 1 (206) that data flow 1 is adopted, encoder 2 (212) and modulator 216 is set according to the CQI1 that receiver feeds back by the AMC controller of transmitter, and the scheme of the encoder 1 (206) that data flow two is adopted, encoder 2 (212) and modulator 216 is set according to the CQI2 that receiver feeds back by the AMC controller of transmitter.At last, modulator 216 is got m1 and m2 bit from two sub data flows respectively at every turn, by specific mapping mode, exports a modulation symbol, and m1 and m2 can equate, also can not wait.Provided the example of a specific mapping mode: two bits (m1=2) of sub data flow 1 are mapped to the bk of 16QAM planisphere shown in Figure 3,0 and bk, 1 position, two bits (m2=2) of sub data flow 2 are mapped to the bk of 16QAM planisphere shown in Figure 3,2 and bk, 3 positions.
In receiver, detection is designed in proper order, and increase according to detection module of the present invention.The structure of receiver as shown in Figure 4 according to the present invention.CQI measuring appliance 402 at first sent into received signal by receiver 400, the CQI of CQI measuring appliance 402 first data flow of difference measurements and calculations and the CQI of second data flow.The following parameter of CQI measuring appliance 402 measurements and calculations:
If the data flow on first transmitting antenna is MMSE and is detected, the data flow on second antenna is SIC and is detected, and two data flow CQI (equivalent SINR) separately are calculated as follows:
Wherein, h
1The channel vector of representing first transmitting antenna correspondence, h
2The channel vector of second transmitting antenna correspondence of expression, N
0The variance of noise in the expression channel.
If the data flow on second transmitting antenna is MMSE and is detected, the data flow on first antenna is SIC and is detected, and two data flow CQI (equivalent SINR) separately are calculated as follows:
Calculate following parameter:
RV1MMSE＝CQI1’-CQI1，
RV1SIC＝CQI1”-CQI1，
RV2MMSE＝CQI2”-CQI2，
RV2SIC＝CQI2’-CQI2。
Above-mentioned four parameters are sent into MMSE sequence selector 404, select according to following criterion:
If RV1MMSE and RV2MMSE differ bigger, the absolute value that is the two difference, is then selected first stream to carry out MMSE earlier and is detected if RV1MMSE is big greater than a pre-set threshold (Th1), if RV2MMSE is big, then selects second stream to carry out MMSE earlier and detect;
If RV1MMSE and RV2MMSE are more or less the same, the absolute value that is the two difference is less than pre-set threshold (Th1), then compare RV1SIC and RV2SIC, if the two differs bigger, promptly the absolute value of the two difference is greater than a pre-set threshold (Th2), so, if RV1SIC is big, then select second stream to carry out MMSE earlier and detect,, then select first stream to carry out MMSE earlier and detect if RV2SIC is big.
If RV1MMSE and RV2MMSE are more or less the same, promptly the absolute value of the two difference then compares RV1SIC and RV2SIC less than pre-set threshold (Th1).If the two is more or less the same, promptly the absolute value of the two difference so, if RV1MMSE is big, is then selected first stream to carry out MMSE earlier and is detected less than pre-set threshold (Th2), if RV2MMSE is big, then selects second stream to carry out MMSE earlier and detects.
Choose the data flow of at first being carried out the MMSE detection for MMSE sequence selector 404, suppose the data flow (also can be second data flow on the transmitting antenna) on first transmitting antenna, send into MMSE detector 406 and carry out the MMSE detection, the data flow of MMSE detector 406 outputs is sent into layering and is detected selector 408.Layering detects selector 408 and at first reads in four parameter RV1MMSE, RV2MMSE, RV1SIC, RV2SIC, and selects according to following criterion:
If RV1MMSE less than a pre-set threshold (Th3), so, detects data flow stream with MMSE and sends into layering detector 410, carry out layering and detect, promptly only a sub data flow is separated to be in harmonious proportion and decipher, and check CRC.If RV1MMSE greater than pre-set threshold (Th3), so, detects data flow with MMSE and sends into demodulator decorder A (412), adopt MCS1 to separate mediation decoding, and check CRC.If CRC is correct, then the data flow after the decoding on first transmitting antenna that demodulator decorder A (412) is obtained is sent into SIC detector 414.If crc error, then the data flow on 406 pairs of second transmitting antennas of MMSE detector is carried out the MMSE detection.
If the data flow CRC after the decoding on the data flow crc error after the decoding on first transmitting antenna, second transmitting antenna is mistake still, then two MMSE are detected data flow and send into layering detector 410 respectively, carry out layering and detect, and check CRC.
If there is the data flow CRC after the decoding on the transmitting antenna correct, suppose it is data flow on first transmitting antenna, (also can be second data flow on the transmitting antenna), send into SIC detector 414 and carry out Interference Cancellation and high specific MRC merging, the data flow of SIC detector 414 outputs is sent into layering and is detected selector 416.Layering detects selector 416 and at first reads in four parameter RV1MMSE, RV2MMSE, and RV1SIC, RV2SIC, and select according to following criterion:
If RV2SIC less than pre-set threshold (Th3), so, sends the data flow of SIC detector 414 outputs into layering detector 418, carry out layering and detect, promptly only a sub data flow is separated to be in harmonious proportion and decipher, and check CRC; If RV2SIC is greater than pre-set threshold (Th3), so, the data flow of SIC detector 414 outputs is sent into demodulator decorder B (420), adopt MCS2 to separate mediation decoding, and check CRC, if CRC is correct, then feed back the ack signal of two data flow, if crc error, the data flow of SIC detector 414 outputs is sent into layering detector 418, carry out layering and detect, promptly only a sub data flow is separated to be in harmonious proportion and decipher, and check CRC.
The concrete operations of layering detector 410 and layering detector 418, be described as follows with an example: in transmitter, two sub data flow A and B add CRC respectively, be sent in the modulator through identical or different coding with after interweaving, modulator adopts the 16QAM modulation, and modulator is got two bits from sub data flow A, be mapped to the bk of 16QAM planisphere shown in Figure 3,0 and bk, 1 position.Modulator is got two bits from sub data flow B, be mapped to the bk of the 16QAM planisphere shown in the figure three, and 2 and bk, 3 positions.In receiver, if channel quality is enough good, can directly carry out the 16QAM demodulation so, and obtain two soft bit stream A ' and B ', two soft bit stream A ' and B ' carry out deinterleaving, decoding and CRC check respectively, if channel quality is relatively poor, can carry out the QPSK demodulation so, obtain a soft bit stream A ', soft bit stream A ' carries out deinterleaving, decoding and CRC check.If the CRC of A ' is correct, the partial information bit just is successfully received so, and HARQ retransmits and just can not retransmit.
Transmitter has two transmitting antennas, data flow of each transmitting antenna transmission, each data flow comprises two sub data flows, two sub data flows of first data flow are respectively through increasing by 16 bit CRC, 1/3 Turbo coding, after the operation such as random interleaving, modulator is got two bits from first sub data flow, be mapped to the bk of 16QAM planisphere shown in Figure 3,0 and bk, 1 position, modulator is got two bits from second sub data flow, be mapped to the bk of 16QAM planisphere shown in Figure 3,2 and bk, 3 positions; Data flow on each transmitting antenna is launched after modulating through OFDM.
Receiver has two reception antennas, receiver at first carries out the measurements and calculations of CQI, obtain the channel quality of the actual actual experience of each data flow, MMSE sequence selector and layering detect selector and compare according to the desired channel quality of the channel quality of the actual experience of each data flow of reality and MCS scheme that each data flow is selected for use, channel quality than each data flow expectation, the channel quality of the actual experience of which data flow is good, at first carries out the MMSE detection with regard to selecting to change data flow.The equal mistake of CRC after if two MMSE detect, crc error after perhaps a SIC detects, perhaps the channel quality of the actual experience of one or two data flow is more far short of what is expected than the channel quality of expectation, and this data flow will be carried out the layering detection so, thereby drop to the loss of throughput minimum.
Claims (7)
1. a MIMO-MMSE-SIC-HARQ communication system comprises transmitter and receiver, wherein
Described transmitter comprises coding demodulator, and described coding demodulator comprises:
Segmenting unit, being suitable for transmitting antenna data flow point section is two or more sub data flows,
The CRC encoder is suitable for described sub data flow is carried out bit check code and punching;
Interleaver is suitable for encoded data stream is interweaved;
Modulator is suitable for getting identical or different number bits from each sub data flow that has interweaved respectively at every turn, by mapping, exports a modulation symbol;
Described receiver comprises:
The channel quality measurement device is suitable for measuring and the calculating channel quality, obtains the channel quality of the actual experience of each data flow;
The MMSE detector is suitable for that data stream is carried out MMSE and detects;
The SIC detector is suitable for that data stream is carried out SIC and detects;
The layering detector carries out layering to data stream and detects.
2. communication system according to claim 1 is characterized in that, in described transmitter, and the information bit number difference of each sub data flow.
3. communication system according to claim 1 is characterized in that, in described transmitter, the coding of each sub data flow is different with hole knockout.
4. communication system according to claim 1 is characterized in that, in described transmitter, and the interleaving mode difference of each sub data flow.
5. communication system according to claim 1 is characterized in that, in described transmitter, and the bit number difference that modulator reads from each sub data flow at every turn.
6. communication system according to claim 1 is characterized in that, described MMSE detector comprises the MMSE sequence selector, and described sequence selector is suitable for:
If with respect to the channel quality of expectation, the channel quality that the MMSE of a plurality of data flow obtains after detecting differs bigger, then selects the best MMSE that carries out earlier of relative channel quality that obtains after the MMSE detection to detect;
If with respect to the channel quality of expectation, the channel quality that the MMSE of a plurality of data flow obtains after detecting is more or less the same, and then proceeds to select;
If with respect to the channel quality of expectation, the channel quality that the SIC of a plurality of data flow obtains after detecting is more or less the same, and then selects the best MMSE that carries out earlier of relative channel quality that obtains after the MMSE detection to detect; And
If the channel quality that the SIC of a plurality of data flow obtains after detecting differs bigger, then select the poorest MMSE that carries out earlier of relative channel quality that obtains after the SIC detection to detect.
7. communication system according to claim 1 is characterized in that described layering detector comprises that layering detects selector, and described layering detects selector and is suitable for:
Do the MMSE detection when data flow is set at by the MMSE sequence selector, when the channel quality that this data flow MMSE obtains after detecting is poor, then selects this data flow to carry out layering and detect;
Be MMSE and detect when data flow is set at by the MMSE sequence selector, the channel quality that this data flow MMSE obtains after detecting is not poor, and behind the demodulation coding during crc error, then selects this data flow to carry out layering and detect;
Do the SIC detection when data flow is set at by layering detection selector, when the channel quality that this data flow SIC obtains after detecting is poor, then selects this data flow to carry out layering and detect;
Do the SIC detection when data flow is set at by layering detection selector, the channel quality that this data flow SIC obtains after detecting is not poor, and crc error behind the demodulation coding, then selects this data flow to carry out layering and detects.
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