CN103401641A - Descrambling method of placeholder y in LTE UCI coding information and system - Google Patents

Descrambling method of placeholder y in LTE UCI coding information and system Download PDF

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CN103401641A
CN103401641A CN2013103226217A CN201310322621A CN103401641A CN 103401641 A CN103401641 A CN 103401641A CN 2013103226217 A CN2013103226217 A CN 2013103226217A CN 201310322621 A CN201310322621 A CN 201310322621A CN 103401641 A CN103401641 A CN 103401641A
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soft
bit
descrambling
soft bit
placeholder
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CN103401641B (en
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陈住生
龚科
杨新玲
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Wuhan Research Institute of Posts and Telecommunications Co Ltd
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Abstract

The invention discloses a descrambling method of a placeholder y in LTE UCI coding information and a system. The method comprises the steps of demodulating data of a receiving terminal and UCI information and then outputting soft bits, performing descrambling processing on the demodulated soft bits, performing de-interleaving processing according to descrambling process results, so as to separate the soft bit conducted to descrambling corresponding to the data from the soft bit conducted to descrambling corresponding to the UCI information, finding out the soft bit corresponding to a placeholder y according to a modulation mode in the soft bit conducted to descrambling corresponding to the UCI information obtained after separation, correcting the soft bit corresponding to the placeholder y, and performing saturated adding on information soft bit and the corrected soft bit corresponding to the placeholder y, and decoding obtained results. The method is simple to realize, rapid and efficient, can sufficiently utilize information carried by the placeholder y to decode the UCI information, and improves the decoding accuracy.

Description

Placeholder y de-scrambling method and system in LTE UCI coded message
Technical field
The present invention relates to mobile communication LTE field, relate in particular in UCI (ascending control information) coded message placeholder y in a kind of Simple fast implementation method of receiving terminal descrambling.
Background technology
At LTE (Long Term Evolution, Long Term Evolution) wireless network access communications field, transmitting for guarantee information, adopted the error control mechanism of HARQ (mixed automatic retransmission request), it is the combination that forward error correction (FEC) and error detection add autonomous retransmission (ARQ) technology that " mixing " of HARQ is embodied in it, the HARQ technological synthesis advantage of FEC and ARQ.The FEC technology is carried out error correction according to receiving redundant information in data, and characteristics are " only entangle and do not pass "; The ARQ technology relies on error code to detect and re-send request may ensures signal quality, and characteristics are " only pass and do not entangle ".In HARQ, make a start and can send the data with certain redundant information, at first receiving terminal carries out forward error correction (FEC), if still could not correct decoding the debit by the ACK(positive acknowledgement)/the NACK(Negative Acknowledgement) tell transmit leg to resend data, ACK/NACK generally is called for short A/N.Therefore the transmitting of A/N plays vital effect in the HARQ retransmission mechanism.
In LTE wireless network access communications field, at channel quality good and channel relevancy low in, can adopt the MIMO(multiple-input, multiple-output), transmit as far as possible more data, to improve the speed of communication; Channel relevancy represents by the order RI of channel matrix, and receiving terminal feeds back to transmitting terminal by the order that calculating estimates channel matrix, and transmitting terminal is selected suitable transmission mode according to feedack.
Visible A/N, RI(order indication) the UCI(control message such as) the transmitting relation of information the transmitting of data, traffic rate and the availability of frequency spectrum.In the LTE system, adopted many kinds of measures to guarantee the transmitting of UCI information.Wherein a kind of measure is exactly that UCI is inserted to x and y placeholder in transmitting terminal information source coding, its scrambling modulation Euclidean distance is afterwards maximized, thereby reduce the probability that it is misread at the decoding end.
At transmitting terminal, encode and scrambling, due to insertion x and y placeholder process that the information source of different UCI information in LTE is encoded, the scrambling modulated process is basically identical; Again due at QPSK, 16QAM, in the 64QAM situation, the basic handling flow process is basically identical; Therefore only take RI, in the QPSK situation, be described and illustrate as example.Under the QPSK modulation case, the RI of 1bit
Figure BDA00003586112900011
Dibit after the information source coding is
Figure BDA00003586112900012
Through after dibit scrambled code [c (0), c (1)] scrambling, being Wherein
Figure BDA00003586112900014
b ~ ( 1 ) = b ~ ( 0 ) , The computing of ∧ presentation logic xor operation.See table:
Figure BDA00003586112900021
Wherein, Q mThe expression modulation scheme, 2,4,6 represent respectively QPSK, 16QAM, 64QAM.
In LTE uplink receiving end handling process, at first need to carry out channel estimating, channel equalization, then as shown in Figure 1, through IDFT (inverse discrete Fourier transform) precoding, demodulation, descrambling, the pretreated data flow of deinterleaving gained, be divided into two parts, data division goes rate-matched, and after HARQ merged, channel decoding (Turb decoding) obtained TB data; Another part is the UCI(ascending control information) decoding, decoding obtains UCI Bit to UCI Soft bit.
Owing in transmitting terminal data and UCI information process, interweaving, therefore before receiving terminal is not having deinterleaving, be difficult to or need certain cost to judge the soft bit that placeholder y is corresponding (soft bit) position, therefore general feasible method is directly to carry out descrambling, when UCI processes, have to abandon the corresponding soft bit of placeholder (soft bit), thereby lost the upper entrained information of placeholder y.
Summary of the invention
The object of the invention is to overcome above-mentioned technical disadvantages, with the corresponding soft bit of the quick descrambling placeholder of a kind of method of simple possible.
Technical scheme of the present invention is the placeholder y de-scrambling method in a kind of LTE UCI coded message, for to gained after adopting scrambled code [c (0), c (1)] scrambling at transmitting terminal based on dibit [b (0), b (1)]
Figure BDA00003586112900022
Carry out descrambling, at receiving terminal, carry out and comprise the following steps,
Step 1, carry out demodulation by the data of receiving terminal and ascending control information, and demodulation result comprises soft bit
Figure BDA00003586112900023
Step 2, carry out scramble process by step 1 demodulation result, and the descrambling result comprises soft bit [b Soft(0), b Soft(1)], descrambling realizes according to following formula,
Figure BDA00003586112900024
Figure BDA00003586112900025
Wherein, For two soft bits before descrambling after the receiving terminal demodulation, [c Soft(0), c Soft(1)] be the soft bit of two descramblings of receiving terminal, [b Soft(0), b Soft(1)] be two soft bits after the receiving terminal descrambling, [c Soft(0), c Soft(1)] identical with transmitting terminal scrambled code used [c (0), c (1)];
Step 3, carry out the deinterleaving processing according to step 2 gained scramble process result, mask data and soft bit [b Soft(0), b Soft(1)];
Step 4, at the separating obtained soft bit [b of step 3 Soft(0), b Soft(1) ,], according to modulation system, find out the corresponding soft bit b of placeholder y Soft(1), obtain soft bit b Soft(0);
Step 5, the soft bit b corresponding to step 4 gained placeholder y Soft(1) revise, revise according to following formula and realize,
Figure BDA00003586112900031
Figure BDA00003586112900034
Figure BDA00003586112900035
Figure BDA00003586112900036
Figure BDA00003586112900037
Figure BDA00003586112900038
Wherein 0 SoftThe soft bit of expression bit 0 correspondence,
Figure BDA000035861129000310
Information b (0), the b (1) of expression transmitting terminal pass through respectively scrambled code c (0), c (1) scrambling and subsequent treatment, then pass through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;
Step 6, by the revised b of step 5 SoftAnd the soft bit b of step 4 gained (1) Soft(0) carry out saturated adding, acquired results is carried out to decoding.
The present invention also provides the placeholder y descrambling system in corresponding a kind of LTE UCI coded message, for to gained after adopting scrambled code [c (0), c (1)] scrambling at transmitting terminal based on dibit [b (0), b (1)] Carry out descrambling, in the receiving terminal setting, comprise with lower unit,
For the unit that the data of receiving terminal and ascending control information are carried out to demodulation, demodulation result comprises soft bit
Figure BDA000035861129000312
For demodulation result being carried out to the unit of scramble process, the descrambling result comprises soft bit [b Soft(0), b Soft(1)], descrambling realizes according to following formula,
Figure BDA000035861129000313
Figure BDA000035861129000314
Wherein,
Figure BDA00003586112900041
For two soft bits before descrambling after the receiving terminal demodulation, [c Soft(0), c Soft(1)] be the soft bit of two descramblings of receiving terminal, [b Soft(0), b Soft(1)] be two soft bits after the receiving terminal descrambling, [c Soft(0), c Soft(1)] identical with transmitting terminal scrambled code used [c (0), c (1)];
For according to the scramble process result, carrying out the deinterleaving processing, mask data and soft bit [b Soft(0), b Soft(1) unit];
Be used at separating obtained soft bit [b Soft(0), b Soft(1) ,], according to modulation system, find out the corresponding soft bit b of placeholder y Soft(1), obtain soft bit b Soft(0) unit;
For the soft bit b corresponding to placeholder y Soft(1) unit of revising, revise according to following formula and realize,
Figure BDA00003586112900044
Figure BDA00003586112900045
Figure BDA00003586112900046
Figure BDA00003586112900047
Figure BDA00003586112900048
Figure BDA00003586112900049
Figure BDA000035861129000410
Wherein 0 SoftThe soft bit of expression bit 0 correspondence,
Figure BDA000035861129000411
Information b (0), the b (1) of expression transmitting terminal pass through respectively scrambled code c (0), c (1) scrambling and subsequent treatment, then pass through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;
Be used for revised b SoftAnd soft bit b (1) Soft(0) carry out saturated adding, acquired results is carried out to the unit of decoding.
The present invention realizes simply, rapidly and efficiently, can take full advantage of the entrained information of placeholder y and carry out decoding UCI information, improves the correctness of decoding.
The accompanying drawing explanation
Fig. 1 is receiving terminal bit-level handling process schematic diagram;
Fig. 2 is the handling process schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, describe technical solution of the present invention in detail.
Due to insertion x and the y placeholder process of the coding of UCI information source in LTE, the scrambling modulated process is basically identical; Again due at QPSK, 16QAM, in the 64QAM situation, the basic handling flow process is basically identical; Therefore embodiment is only to be described and to illustrate as example in the QPSK situation.As shown in Figure 2, while specifically implementing, can adopt the software engineering following flow process of operation automatically:
Step 1, the demodulation of data and UCI: receiving terminal is carried out to demodulation through pretreated UCI and data, and UCI and data after the output demodulation, comprising soft bit
Step 2, the unified descrambling of data and UCI: the result after the receiving terminal demodulation is carried out to scramble process:
Figure BDA00003586112900052
Figure BDA00003586112900053
Wherein
Figure BDA00003586112900054
For two soft bit before descrambling after the receiving terminal demodulation, [c Soft(0), c Soft(1)] be the two descrambling soft bit that transmitting terminal scrambled code used [c (0), c (1)] is corresponding, [b Soft(0), b Soft(1)] be two soft bit, [b at this moment after descrambling Soft(0), b Soft(1)] also with data interlacing, be in the same place.
Step 3, deinterleaving are isolated UCI and the data of soft bit: after descrambling, carry out again the deinterleaving processing, thereby by soft bit [b after data and descrambling corresponding to UCI information Soft(0), b Soft(1)] separate;
Step 4, judge the position of the corresponding soft bit of placeholder Y placeholder: the soft bit [b that is separating Soft(0), b Soft(1)], according to modulation system, find out the soft bit that placeholder y is corresponding, i.e. b Soft(1);
Step 5, revise the soft bit that the y placeholder is corresponding: i.e. the soft bit b corresponding to step 4 gained placeholder y Soft(1) revise,
Figure BDA00003586112900055
Figure BDA00003586112900056
Figure BDA00003586112900057
Figure BDA00003586112900058
Figure BDA00003586112900059
Figure BDA000035861129000510
Figure BDA000035861129000511
Figure BDA000035861129000512
Figure BDA000035861129000513
Wherein 0 SoftThe soft bit of expression bit 0 correspondence,
Figure BDA00003586112900061
Information b (0), the b (1) of expression transmitting terminal, through scrambled code c (0), c (1) scrambling and subsequent treatment, then pass through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation, the i.e. soft bit of step 1 gained
Figure BDA00003586112900062
Can find revised b thus Soft(1) independent uncorrelated in b SoftAnd same b (0) Soft(0) equally carried the information of b (0).
Step 6, carry out saturated addition and carry out UCI decoding a UCI soft bit information corresponding to modulation symbol: finally by the revised b of step 5 SoftAnd the soft bit b of step 4 gained information (1) Soft(0) carry out saturated adding, acquired results is carried out to decoding, thereby improve the accuracy of decoding.
During concrete enforcement, can also adopt the software modularity mode that corresponding system is provided at receiving terminal, be included as each step corresponding units is provided.Can comprise with lower unit in the receiving terminal setting,
For the unit that the data of receiving terminal and ascending control information are carried out to demodulation, demodulation result comprises soft bit
Figure BDA00003586112900063
For demodulation result being carried out to the unit of scramble process, the descrambling result comprises soft bit [b Soft(0), b Soft(1)], descrambling realizes according to following formula,
Figure BDA00003586112900064
Figure BDA00003586112900065
Wherein,
Figure BDA00003586112900066
For two soft bits before descrambling after the receiving terminal demodulation, [c Soft(0), c Soft(1)] be the soft bit of two descramblings of receiving terminal, [b Soft(0), b Soft(1)] be two soft bits after the receiving terminal descrambling, [c Soft(0), c Soft(1)] be the two descrambling soft bit that transmitting terminal scrambled code used [c (0), c (1)] is corresponding;
For according to the scramble process result, carrying out the deinterleaving processing, mask data and soft bit [b Soft(0), b Soft(1) unit];
Be used at separating obtained soft bit [b Soft(0), b Soft(1) ,], according to modulation system, find out the corresponding soft bit b of placeholder y Soft(1) unit;
For the soft bit b corresponding to placeholder y Soft(1) unit of revising, revise according to following formula and realize,
Figure BDA00003586112900071
Figure BDA00003586112900072
Figure BDA00003586112900073
Figure BDA00003586112900075
Figure BDA00003586112900076
Figure BDA00003586112900077
Figure BDA00003586112900078
Figure BDA00003586112900079
Wherein 0 SoftThe soft bit of expression bit 0 correspondence, Information b (0), the b (1) of expression transmitting terminal pass through respectively scrambled code c (0), c (1) scrambling and subsequent treatment, then pass through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;
Be used for revised b SoftAnd soft bit b (1) Soft(0) carry out saturated adding, acquired results is carried out to the unit of decoding.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.

Claims (2)

1. the placeholder y de-scrambling method in a LTE UCI coded message, for to gained after adopting scrambled code [c (0), c (1)] scrambling at transmitting terminal based on dibit [b (0), b (1)]
Figure FDA00003586112800011
Carry out descrambling, it is characterized in that: at receiving terminal, carry out and comprise the following steps,
Step 1, carry out demodulation by the data of receiving terminal and ascending control information, and demodulation result comprises soft bit
Figure FDA00003586112800012
Step 2, carry out scramble process by step 1 demodulation result, and the descrambling result comprises soft bit [b Soft(0), b Soft(1)], descrambling realizes according to following formula,
Figure FDA00003586112800014
Wherein,
Figure FDA00003586112800015
For two soft bits before descrambling after the receiving terminal demodulation, [c Soft(0), c Soft(1)] be the soft bit of two descramblings of receiving terminal, [b Soft(0), b Soft(1)] be two soft bits after the receiving terminal descrambling, [c Soft(0), c Soft(1)] identical with transmitting terminal scrambled code used [c (0), c (1)];
Step 3, carry out the deinterleaving processing according to step 2 gained scramble process result, mask data and soft bit [b Soft(0), b Soft(1)];
Step 4, at the separating obtained soft bit [b of step 3 Soft(0), b Soft(1) ,], according to modulation system, find out the corresponding soft bit b of placeholder y Soft(1), obtain soft bit b Soft(0);
Step 5, the soft bit b corresponding to step 4 gained placeholder y Soft(1) revise, revise according to following formula and realize,
Figure FDA00003586112800017
Figure FDA00003586112800018
Figure FDA00003586112800019
Figure FDA000035861128000110
Figure FDA000035861128000111
Figure FDA000035861128000112
Figure FDA000035861128000113
Figure FDA000035861128000114
Wherein 0 SoftThe soft bit of expression bit 0 correspondence,
Figure FDA00003586112800021
Information b (0), the b (1) of expression transmitting terminal pass through respectively scrambled code c (0), c (1) scrambling and subsequent treatment, then pass through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;
Step 6, by the revised b of step 5 SoftAnd the soft bit b of step 4 gained (1) Soft(0) carry out saturated adding, acquired results is carried out to decoding.
2. the placeholder y descrambling system in a LTE UCI coded message, for to gained after adopting scrambled code [c (0), c (1)] scrambling at transmitting terminal based on dibit [b (0), b (1)]
Figure FDA00003586112800022
Carry out descrambling, it is characterized in that: in the receiving terminal setting, comprise with lower unit,
For the unit that the data of receiving terminal and ascending control information are carried out to demodulation, demodulation result comprises soft bit
Figure FDA00003586112800023
For demodulation result being carried out to the unit of scramble process, the descrambling result comprises soft bit [b Soft(0), b Soft(1)], descrambling realizes according to following formula,
Figure FDA00003586112800024
Figure FDA00003586112800025
Wherein,
Figure FDA00003586112800026
For two soft bits before descrambling after the receiving terminal demodulation, [c Soft(0), c Soft(1)] be the soft bit of two descramblings of receiving terminal, [b Soft(0), b Soft(1)] be two soft bits after the receiving terminal descrambling, [c Soft(0), c Soft(1)] identical with transmitting terminal scrambled code used [c (0), c (1)];
For according to the scramble process result, carrying out the deinterleaving processing, mask data and soft bit [b Soft(0), b Soft(1) unit];
Be used at separating obtained soft bit [b Soft(0), b Soft(1) ,], according to modulation system, find out the corresponding soft bit b of placeholder y Soft(1), obtain soft bit b Soft(0) unit;
For the soft bit b corresponding to placeholder y Soft(1) unit of revising, revise according to following formula and realize,
Figure FDA00003586112800031
Figure FDA00003586112800032
Figure FDA00003586112800033
Figure FDA00003586112800034
Figure FDA00003586112800035
Figure FDA00003586112800036
Figure FDA00003586112800037
Figure FDA00003586112800038
Figure FDA00003586112800039
Wherein 0 SoftThe soft bit of expression bit 0 correspondence,
Figure FDA000035861128000310
Information b (0), the b (1) of expression transmitting terminal pass through respectively scrambled code c (0), c (1) scrambling and subsequent treatment, then pass through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;
Be used for revised b SoftAnd soft bit b (1) Soft(0) carry out saturated adding, acquired results is carried out to the unit of decoding.
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Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan

Patentee before: Wuhan Inst. of Post & Telecom Science