CN103401641B - Placeholder y de-scrambling method in LTE UCI coding information and system - Google Patents

Abstract

A kind of LTE? placeholder y de-scrambling method in UCI coding information and system, export soft bit including after the data of receiving terminal and UCI information being demodulated; Soft bit after demodulation is carried out scramble process; It is deinterleaved processing according to scramble process result, thus being separated by soft bit after descrambling corresponding with UCI information for data; After the descrambling that separating obtained UCI information is corresponding in soft bit, find out soft bit corresponding to placeholder y according to modulation system; The soft bit that placeholder y is corresponding is modified; The soft bit that soft for information bit is corresponding with revised placeholder y is carried out saturated adding, acquired results is decoded. The present invention realizes simply, rapidly and efficiently, it is possible to the information entrained by placeholder y that makes full use of, to decode UCI information, improves the correctness of decoding.

Description

Placeholder y de-scrambling method in LTE UCI coding information and system

Technical field

The present invention relates to mobile communication LTE field, particularly relate to that the one unscrambled at receiving terminal of placeholder y in UCI (ascending control information) coding information is simple and quick realizes method.

Background technology

At LTE (LongTermEvolution, Long Term Evolution) wireless network access communications field, transmitting for guarantee information, have employed the error control mechanism of HARQ (mixed spin system), " mixing " of HARQ is embodied in it is the combination that forward error correction (FEC) and error detection add autonomous retransmission (ARQ) technology, the HARQ technological synthesis advantage of FEC and ARQ. FEC technology carries out error correction according to receiving redundancy in data, is characterized as being " only entangle and do not pass "; ARQ technology relies on error code detection and repeating transmission request to ensure signal quality, and is characterized as being " only pass and do not entangle ". In the harq, make a start and can send the data with certain redundancy, first receiving terminal carries out forward error correction (FEC), if still can not correct decoding; debit pass through ACK(positive acknowledgment)/NACK(Negative Acknowledgement) tell that sender resends data, ACK/NACK is generally called for short A/N. Therefore the transmitting of A/N plays vital effect in HARQ retransmission mechanism.

In LTE wireless network access communications field, when channel quality is good and channel relevancy is low, it is possible to adopt MIMO(multiple-input, multiple-output), transmit more data as far as possible, to improve the speed of communication; Channel relevancy is represented by the order RI of channel matrix, and receiving terminal feeds back to transmitting terminal by calculating the order estimating channel matrix, and transmitting terminal selects suitable transmission mode according to feedack.

Visible A/N, RI(order indicates) etc. UCI(control message) transmitting of information is related to the transmitting of data, traffic rate and the availability of frequency spectrum.LTE system have employed many kinds of measures and guarantee the transmitting of UCI information. One of which measure is exactly that UCI inserts x and y placeholder when transmitting terminal message sink coding so that it is the Euclidean distance after scrambling modulation maximizes, thus reducing its probability misread at decoding end.

Being encoded and scrambling at transmitting terminal, due to insertion x and the y placeholder process of the message sink coding of UCI information different in LTE, scrambling modulated process is basically identical; Again due in QPSK, 16QAM, 64QAM situation basic handling flow process basically identical; Therefore only it is described in QPSK situation for RI and illustrates. Under QPSK modulation case, the RI of 1bitDibit after message sink coding isAfter dibit scrambled code [c (0), c (1)] scrambling it isWherein $\tilde{b}\left(1\right)=\tilde{b}\left(0\right),$ �� represents logic xor operation computing. Referring to following table:

Wherein, Q_mRepresenting modulation scheme, 2,4,6 represent QPSK, 16QAM, 64QAM respectively.

In LTE uplink receiving end handling process firstly the need of carrying out channel estimating, channel equalization, then as shown in Figure 1, it is divided into two parts through IDFT (inverse discrete Fourier transform) precoding, demodulation, descrambling, the pretreated data stream of deinterleaving gained, data division derate is mated, and after HARQ merges, channel decoding (Turb decoding) obtains TBdata; Another part is UCI(ascending control information) decoding, UCISoftbit decoding is obtained UCIBit.

Interweave owing to passing through in transmitting terminal data and UCI information, therefore it is difficult to before there is no deinterleaving at receiving terminal or needs certain cost to judge soft bit (softbit) position corresponding for placeholder y, therefore generally feasible method is to be made directly descrambling, have to when UCI processes the soft bit (softbit) that abandons corresponding to placeholder, thus the information entrained by lost placeholder y on.

Summary of the invention

It is an object of the invention to overcome above-mentioned technical disadvantages, quickly unscramble the soft bit corresponding to placeholder with a kind of method of simple possible.

The technical scheme is that the placeholder y de-scrambling method in a kind of LTEUCI coding information, for at transmitting terminal based on dibit [b (0), b (1)] adopt gained after scrambled code [c (0), c (1)] scramblingUnscramble, perform to comprise the following steps at receiving terminal,

The data of receiving terminal and ascending control information are demodulated by step 1, and demodulation result includes soft bit

Step 2, carries out scramble process by step 1 demodulation result, and descrambling result includes soft bit [b_soft(0),b_soft(1)], unscramble and realize according to below equation,

Wherein,Two soft bits before unscrambling after demodulating for receiving terminal, [c_soft(0),c_soft(1)] soft bit, [b are unscrambled for the two of receiving terminal_soft(0),b_soft(1) two soft bits after] unscrambling for receiving terminal, [c_soft(0),c_soft(1)] and scrambled code used by transmitting terminal [c (0), c (1)] identical;

Step 3, is deinterleaved process, mask data and soft bit [b according to step 2 gained scramble process result_soft(0),b_soft(1)];

Step 4, in the separating obtained soft bit [b of step 3_soft(0),b_soft(1), in], the soft bit b corresponding to placeholder y is found out according to modulation system_soft(1), soft bit b is obtained_soft(0);

Step 5, the soft bit b that step 4 gained placeholder y is corresponding_soft(1) it is modified, revises and realize according to below equation,

Wherein 0_softRepresent the soft bit of bit 0 correspondence,Represent that the information b (0) of transmitting terminal, b (1) are respectively through scrambled code c (0), c (1) scrambling and subsequent treatment, are then passed through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;

Step 6, by revised for step 5 b_softAnd the soft bit b of step 4 gained (1)_soft(0) carry out saturated adding, acquired results is decoded.

Present invention also offers the placeholder y descrambling system in corresponding a kind of LTEUCI coding information, for at transmitting terminal based on dibit [b (0), b (1)] adopt gained after scrambled code [c (0), c (1)] scramblingUnscramble, arrange at receiving terminal and include with lower unit,

For the unit data of receiving terminal and ascending control information being demodulated, demodulation result includes soft bit

For demodulation result carries out the unit of scramble process, descrambling result includes soft bit [b_soft(0),b_soft(1)], unscramble and realize according to below equation,

Wherein,Two soft bits before unscrambling after demodulating for receiving terminal, [c_soft(0),c_soft(1)] soft bit, [b are unscrambled for the two of receiving terminal_soft(0),b_soft(1) two soft bits after] unscrambling for receiving terminal, [c_soft(0),c_soft(1)] and scrambled code used by transmitting terminal [c (0), c (1)] identical;

For being deinterleaved process, mask data and soft bit [b according to scramble process result_soft(0),b_soft(1) unit];

For at separating obtained soft bit [b_soft(0),b_soft(1), in], the soft bit b corresponding to placeholder y is found out according to modulation system_soft(1), soft bit b is obtained_soft(0) unit;

For the soft bit b that placeholder y is corresponding_soft(1) unit being modified, revises and realizes according to below equation,

Wherein 0_softRepresent the soft bit of bit 0 correspondence,Represent that the information b (0) of transmitting terminal, b (1) are respectively through scrambled code c (0), c (1) scrambling and subsequent treatment, are then passed through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;

For by revised b_softAnd soft bit b (1)_soft(0) carry out saturated adding, acquired results is carried out the unit decoded.

The present invention realizes simply, rapidly and efficiently, it is possible to the information entrained by placeholder y that makes full use of, to decode UCI information, improves the correctness of decoding.

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.

Detailed description of the invention

Technical solution of the present invention is described in detail below in conjunction with drawings and Examples.

Due to insertion x and the y placeholder process of UCI message sink coding in LTE, scrambling modulated process is basically identical; Again due in QPSK, 16QAM, 64QAM situation basic handling flow process basically identical; Therefore embodiment is only described and illustrates in QPSK situation. As in figure 2 it is shown, when being embodied as, software engineering can be adopted automatically to run below scheme:

The demodulation of step 1, data and UCI: the receiving terminal UCI through pretreatment and data are demodulated, UCI after output demodulation and data, including soft bit

The unified descrambling of step 2, data and UCI: the result after being demodulated by receiving terminal carries out scramble process:

WhereinFront two softbit, [c is unscrambled for receiving terminal after demodulating_soft(0),c_soft(1)] the two descrambling softbit, [b that scrambled code [c (0), c (1)] used by transmitting terminal is corresponding_soft(0),b_soft(1)] for two softbit, now [b after descrambling_soft(0),b_soft(1)] also and data weave in.

Step 3, deinterleaves UCI and the data of isolating soft bit: be deinterleaved processing after descrambling again, thus by soft bit [b after descrambling corresponding with UCI information for data_soft(0),b_soft(1)] separate;

Step 4, it is judged that the position of the soft bit corresponding to placeholder Y placeholder: at the soft bit [b separated_soft(0),b_soft(1) according to modulation system in], soft bit corresponding to placeholder y, i.e. b are found out_soft(1);

Step 5, is modified the soft bit that y placeholder is corresponding: namely that step 4 gained placeholder y is corresponding soft bit b_soft(1) it is modified,

Wherein 0_softRepresent the soft bit of bit 0 correspondence,Represent the scrambled code c (0) of the information b (0) of transmitting terminal, b (1), c (1) scrambling and subsequent treatment, it is then passed through wireless channel H, soft bit after receiving terminal front-end processing and demodulation, i.e. the soft bit of step 1 gained

Thus it appeared that revised b_soft(1) independent uncorrelated in b_softAnd same b (0)_soft(0) information of b (0) is equally carried.

Step 6, carries out saturated addition to the UCI soft bit information that modulation symbol is corresponding and carries out UCI decoding: finally by revised for step 5 b_softAnd the soft bit b of step 4 gained information (1)_soft(0) carry out saturated adding, acquired results is decoded, thus improving the accuracy of decoding.

When being embodied as, it is also possible to adopt software modularity mode to provide corresponding system at receiving terminal, provide corresponding units including for each step. Can arrange at receiving terminal includes with lower unit,

For the unit data of receiving terminal and ascending control information being demodulated, demodulation result includes soft bit

For demodulation result carries out the unit of scramble process, descrambling result includes soft bit [b_soft(0),b_soft(1)], unscramble and realize according to below equation,

Wherein,Two soft bits before unscrambling after demodulating for receiving terminal, [c_soft(0),c_soft(1)] soft bit, [b are unscrambled for the two of receiving terminal_soft(0),b_soft(1) two soft bits after] unscrambling for receiving terminal, [c_soft(0),c_soft(1)] the two descrambling softbit that scrambled code [c (0), c (1)] used by transmitting terminal is corresponding;

For being deinterleaved process, mask data and soft bit [b according to scramble process result_soft(0),b_soft(1) unit];

For at separating obtained soft bit [b_soft(0),b_soft(1), in], the soft bit b corresponding to placeholder y is found out according to modulation system_soft(1) unit;

For the soft bit b that placeholder y is corresponding_soft(1) unit being modified, revises and realizes according to below equation,

Wherein 0_softRepresent the soft bit of bit 0 correspondence,Represent that the information b (0) of transmitting terminal, b (1) are respectively through scrambled code c (0), c (1) scrambling and subsequent treatment, are then passed through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;

For by revised b_softAnd soft bit b (1)_soft(0) carry out saturated adding, acquired results is carried out the unit decoded.

Specific embodiment described herein is only to present invention spirit explanation for example. Described specific embodiment can be made various amendment or supplements or adopt similar mode to substitute by those skilled in the art, but without departing from the spirit of the present invention or surmount the scope that appended claims is defined.

Claims (2)

1. the placeholder y de-scrambling method in LTEUCI coding information, for gained after transmitting terminal adopts scrambled code [c (0), c (1)] scrambling based on dibit [b (0), b (1)]Unscrambling, [b (0), b (1)] includes the ascending control information UCI of 1 bit and the placeholder y of 1 bit, it is characterised in that: perform to comprise the following steps at receiving terminal,

The data of receiving terminal and ascending control information are demodulated by step 1, and demodulation result includes soft bit

Step 2, carries out scramble process by step 1 demodulation result, and descrambling result includes soft bit [b_soft(0),b_soft(1)], unscramble and realize according to below equation,

Wherein,Two soft bits before unscrambling after demodulating for receiving terminal, [c_soft(0),c_soft(1)] soft bit, [b are unscrambled for the two of receiving terminal_soft(0),b_soft(1) two soft bits after] unscrambling for receiving terminal, [c_soft(0),c_soft(1)] and scrambled code used by transmitting terminal [c (0), c (1)] identical;

Step 3, is deinterleaved process, mask data and soft bit [b according to step 2 gained scramble process result_soft(0),b_soft(1)];

Step 4, in the separating obtained soft bit [b of step 3_soft(0),b_soft(1), in], the soft bit b corresponding to placeholder y is found out according to modulation system_soft(1), soft bit b is obtained_soft(0);

Step 5, the soft bit b that step 4 gained placeholder y is corresponding_soft(1) it is modified, revises and realize according to below equation,

Wherein 0_softRepresent the soft bit of bit 0 correspondence,Represent that the information b (0) of transmitting terminal, b (1) are respectively through scrambled code c (0), c (1) scrambling and subsequent treatment, are then passed through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;

Step 6, by revised for step 5 b_softAnd the soft bit b of step 4 gained (1)_soft(0) carry out saturated adding, acquired results is decoded.

2. the placeholder y descrambling system in LTEUCI coding information, for gained after transmitting terminal adopts scrambled code [c (0), c (1)] scrambling based on dibit [b (0), b (1)]Unscrambling, [b (0), b (1)] includes the ascending control information UCI of 1 bit and the placeholder y of 1 bit, it is characterised in that: arrange at receiving terminal and include with lower unit,

For the unit data of receiving terminal and ascending control information being demodulated, demodulation result includes soft bit

For demodulation result carries out the unit of scramble process, descrambling result includes soft bit [b_soft(0),b_soft(1)], unscramble and realize according to below equation,

Wherein,Two soft bits before unscrambling after demodulating for receiving terminal, [c_soft(0),c_soft(1)] soft bit, [b are unscrambled for the two of receiving terminal_soft(0),b_soft(1) two soft bits after] unscrambling for receiving terminal, [c_soft(0),c_soft(1)] and scrambled code used by transmitting terminal [c (0), c (1)] identical;

For being deinterleaved process, mask data and soft bit [b according to scramble process result_soft(0),b_soft(1) unit];

For at separating obtained soft bit [b_soft(0),b_soft(1), in], the soft bit b corresponding to placeholder y is found out according to modulation system_soft(1), soft bit b is obtained_soft(0) unit;

For the soft bit b that placeholder y is corresponding_soft(1) unit being modified, revises and realizes according to below equation,

Wherein 0_softRepresent the soft bit of bit 0 correspondence,Represent that the information b (0) of transmitting terminal, b (1) are respectively through scrambled code c (0), c (1) scrambling and subsequent treatment, are then passed through wireless channel H, the soft bit after receiving terminal front-end processing and demodulation;

For by revised b_softAnd soft bit b (1)_soft(0) carry out saturated adding, acquired results is carried out the unit decoded.