CN101039304B - Method for producing HARQ feedback signal and apparatus thereof - Google Patents

Abstract

The present invention discloses a generating method and device for HARQ feedback signal based on discrete Fourier Transform expanding frequency Orthogonal Frequency Division Multiplexing modulation. The method includes steps as follows therein: find random sequences, and the second sequence formed by processing the first sequence before transmitting, which formed after the random sequences being modulated accords with the first condition; continue to find a pair sequences according with the second condition from the random sequences which have been found, to denote HARQ feedback signal; load feedback signal on one pair sequences and transmit; and the receiving terminal processes the sequences which have been received and judges the loaded feedback signal as well according to the processing result. So the present invention adopts special sequences at the inchoation, the base station terminal doesn't need communicating channel information, but utilizes the class difference characteristic formed by special sequences to detect ACK/NACK information, therefor saving the resources, enhancing the utilization efficiency, and easy to realize, with fine detecting performance.

Description

HARQ feedback signal generation method and device thereof

Technical field

The present invention relates to a kind of HARQ (Hybrid Automatic Repeat reQuest, mixed automatic retransmission request) feedback signal generation method and device thereof that changes the spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier.

Background technology

As being applied to LTE (Long Term Evolution, Long Term Evolution) modulation system of a kind of single carrier wireless signal of aspect such as up, DFT (discrete Fourier transform (DFT)) spread-spectrum orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency DivisionMultiplexing) single-carrier signal is carried out preliminary treatment by DFT, to export subcarrier then and uniformly-spaced be mapped in the IFFT input, the result of IFFT conversion is as the signal source of emission modulation.The introducing of Cyclic Prefix (CP) has further strengthened the ability of the anti-intersymbol interference of system (ISI) again, has also kept the orthogonality between the subcarrier simultaneously better.

The DFT conversion: $F\underset{d=k=0}{\overset{D-1}{\mathrm{\Σ}}}{f}_k{e}^{-2\mathrm{\πidk}/D}$

K=0...D-1 wherein

The IFT conversion: $f_l=\frac{1}{N}\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_n{e}^{2\mathrm{\πinl}/N}$

L=0...N-1 wherein

Based on above formula, Fig. 1 has provided the signal processing structure figure of DFT-S-OFDM.D＜N among Fig. 1 is at F _d, d=0...D-1 fills N-D individual 0 before input IFT conversion.Its mode of mending 0 is at F _d0 of number such as fill between each value of sequence, remaining 0 is divided equally on the left side and the right of whole sequence, fills as boundary belt.The difference of the numerical value of ordering according to N and subcarrier spacing different, the variable-length of symbol, equipment transmits data by launching continuous symbol.

Adopt technology such as HARQ in the system physical layer links such as LTE, require up link to send the control signals such as ACK/NACK of a bit for each downlink data packet of receiving.HARQ combines FEC and ARQ technology advantage separately, can increase the reliability of system and the efficiency of transmission of raising system.

The conventional method up link need be placed reference signal on suitable running time-frequency resource point, so that the base station obtains channel information, again ACK/NACK is carried out coherent detection, if but this moment, up link did not need the data that send, still need to be control signals such as ACK/NACK configuration corresponding reference signal, resource utilization will reduce significantly.

Therefore,, guarantee the reliability of transmission simultaneously, need a kind of HARQ feedback signal generation method and device thereof that changes the spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier in order to improve the validity of transmission.

Summary of the invention

The invention provides a kind of HARQ feedback signal and generate method and apparatus, utilize the incoherent detection of the class difference characteristic realization ACK/NACK of special sequence based on the modulation of discrete Fourier variation spread-spectrum orthogonal frequency division multiplexing.

An aspect of of the present present invention provides a kind of HARQ feedback signal generation method that changes the spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier, may further comprise the steps: step S202, seek random sequence, wherein first sequence of random sequence through forming after the ovennodulation satisfies first condition through sending second sequence that forms after the pre-treatment; Step S204 continues to seek the pair of sequences that satisfies second condition from the random sequence that searches out, in order to characterize the HARQ feedback signal; Step S206, the carrying feedback information sends on pair of sequences; And step S208, receiving terminal is handled the sequence that receives, and judges the feedback information that is carried according to result.

Wherein, modulation comprises QPSK, 16QAM, 64QAM, 256QAM, 1024QAM and 4096QAM, and the transmission pre-treatment comprises discrete Fourier transform (DFT).The sequence length of first sequence is an even number.

First condition is: the adjacent two symbols of second sequence or the result that presses two or more symbol conjugate multiplication that pre-defined rule arranges are for real number, imaginary number or satisfy in the default character any.

In addition, second condition is: the result of the adjacent two symbols of a sequence in the pair of sequences or two or more symbol conjugate multiplication of arranging by pre-defined rule and the adjacent two symbols of another sequence in the pair of sequences or come to the same thing opposite in sign by two or more symbol conjugate multiplication of pre-defined rule arrangement.

According to an aspect of the present invention, step S208 comprises following processing: two or more symbol conjugate multiplication of extracting with the adjacent two symbols in the sequence that receives or by pre-defined rule are also carried out reversal; And with every the result's and with 0 compare, judge feedback information according to comparative result.

Another aspect of the present invention provides a kind of HARQ feedback signal generating means that changes the spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier, comprise: first seeks the unit, be used to seek random sequence, wherein first sequence of random sequence through forming after the ovennodulation satisfies first condition through sending second sequence that forms after the pre-treatment; Second seeks the unit, is used for continuing to seek the pair of sequences that satisfies second condition from the random sequence that searches out, in order to characterize the HARQ feedback signal; Transmitting element is used for carrying feedback information and sends on pair of sequences; And judging unit, be used for the sequence that receives is handled, and judge the feedback information that is carried according to result.

Modulation comprises QPSK, 16QAM, 64QAM, 256QAM, 1024QAM and 4096QAM, and the transmission pre-treatment comprises discrete Fourier transform (DFT).The sequence length of first sequence is an even number.

Wherein, first condition is: the adjacent two symbols of second sequence or the result that presses two or more symbol conjugate multiplication that pre-defined rule arranges are for real number, imaginary number or satisfy in the default character any.

In addition, second condition is: the result of the adjacent two symbols of a sequence in the pair of sequences or two or more symbol conjugate multiplication of arranging by pre-defined rule and the adjacent two symbols of another sequence in the pair of sequences or come to the same thing opposite in sign by two or more symbol conjugate multiplication of pre-defined rule arrangement.

According to a further aspect in the invention, judging unit comprises: computing unit is used for the adjacent two symbols of the sequence that will receive or two or more symbol conjugate multiplication of extracting by pre-defined rule and carries out reversal; And comparing unit, be used for every the result's and with 0 compare, judge feedback information according to comparative result.

Therefore, the present invention is at the employing special sequence of making a start, and the base station end does not need channel information, but utilize the class difference characteristic of special sequence formation that ACK/NACK information is detected, and saved resource, improved utilance, and realize simply having good detection performance.

Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the structure chart that shows single user input sequence conversion;

Fig. 2 shows the flow chart that changes the HARQ feedback signal generation method of spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier according to of the present invention;

Fig. 3 shows the block diagram that changes the HARQ feedback signal generating means of spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier according to of the present invention;

Fig. 4 shows in the up link of LTE system, the block diagram of user's incoherent detection system;

Fig. 5 is the block diagram that shows two users' frequency domain ACK/NACK incoherent detection system;

Fig. 6 shows the structure chart that two users account for a RB simultaneously; And

Fig. 7 is the structure chart that shows the conversion of two users' list entries.

Embodiment

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.

Fig. 2 shows according to of the present invention and changes the flow chart of the HARQ feedback signal generation method of spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier, and as shown in Figure 2, this method may further comprise the steps:

Step S202 seeks random sequence, and wherein first sequence of random sequence through forming after the ovennodulation satisfies first condition through sending second sequence that forms after the pre-treatment;

Step S204 continues to seek the pair of sequences that satisfies second condition from the random sequence that searches out, in order to characterize the HARQ feedback signal;

Step S206, the carrying feedback information sends on pair of sequences; And

Step S208, receiving terminal is handled the sequence that receives, and judges the feedback information that is carried according to result.

Wherein, modulation comprises QPSK, 16QAM, 64QAM, 256QAM, 1024QAM and 4096QAM, and the transmission pre-treatment comprises discrete Fourier transform (DFT).The sequence length of first sequence is an even number.

In addition, first condition is: the adjacent two symbols of second sequence or the result that presses two or more symbol conjugate multiplication that pre-defined rule arranges are for real number, imaginary number or satisfy in the default character any.

Second condition is: the result of the adjacent two symbols of a sequence in the pair of sequences or two or more symbol conjugate multiplication of arranging by pre-defined rule and the adjacent two symbols of another sequence in the pair of sequences or come to the same thing opposite in sign by two or more symbol conjugate multiplication of pre-defined rule arrangement.

Step S208 comprises following processing: two or more symbol conjugate multiplication of extracting with the adjacent two symbols in the sequence that receives or by pre-defined rule are also carried out reversal; And with every the result's and with 0 compare, judge feedback information according to comparative result.

Fig. 3 shows the block diagram that changes the HARQ feedback signal generating means of spread-spectrum orthogonal frequency division multiplexing modulation based on discrete Fourier according to of the present invention.HARQ feedback signal generating means 300 comprises: first seeks unit 302, is used to seek random sequence, and wherein first sequence of random sequence through forming after the ovennodulation satisfies first condition through sending second sequence that forms after the pre-treatment; Second seeks unit 304, is used for continuing to seek the pair of sequences that satisfies second condition from the random sequence that searches out, in order to characterize the HARQ feedback signal; Transmitting element 306 is used for carrying feedback information and sends on pair of sequences; And judging unit 308, be used for the sequence that receives is handled, and judge the feedback information that is carried according to result.

Wherein, modulation comprises QPSK, 16QAM, 64QAM, 256QAM, 1024QAM and 4096QAM, and the transmission pre-treatment comprises discrete Fourier transform (DFT).The sequence length of first sequence is an even number.

First condition is: the adjacent two symbols of second sequence or the result that presses two or more symbol conjugate multiplication that pre-defined rule arranges are for real number, imaginary number or satisfy in the default character any.

Second condition is: the result of the adjacent two symbols of a sequence in the pair of sequences or two or more symbol conjugate multiplication of arranging by pre-defined rule and the adjacent two symbols of another sequence in the pair of sequences or come to the same thing opposite in sign by two or more symbol conjugate multiplication of pre-defined rule arrangement.

Judging unit 308 comprises: computing unit 3082 is used for the adjacent two symbols of the sequence that will receive or two or more symbol conjugate multiplication of extracting by pre-defined rule and carries out reversal; And comparing unit 3084, be used for every the result's and with 0 compare, judge feedback information according to comparative result.

Describe embodiments of the invention in detail below with reference to accompanying drawing.

＜example one〉single user's coherent detection

Fig. 1 is the structure chart that shows single user input sequence conversion, and Fig. 4 is the block diagram that shows user's incoherent detection system in the up link of LTE system.Below in conjunction with Fig. 1 and Fig. 4 one embodiment of the present of invention are described.

Present embodiment has similar class difference repeated encoding by seeking the signal after random sequence is modulated through QPSK in DFT output.

If list entries is a, be A through output sequence after the DFT conversion.The output sequence adjacent sub-carrier satisfies:

A wherein _k(k=0...11) be DFT data afterwards.In the present embodiment, the sequence that has provided satisfies

Max=142.8513.This sequence has a lot, is listed below:

A in the table 1 satisfies through the sequence A after the DFT conversion:

((A(1)*A(2)′)-(A(3)*A(4)′)-(A(5)*A(6)′)-(A(7)*A(8)′)+(A(9)*A(10)′)+(A(11)*A(12)′))＝142.8513

A ' in the table 2 (n) satisfies through the sequence A (n) after the DFT conversion:

(-(A(1)*A(2)′)+(A(3)*A(4)′)+(A(5)*A(6)′)+(A(7)*A(8)′)-(A(9)*A(10)′)-(A(11)*A(12)′))＝142.8513

Therefore, after the sequence adjacent sub-carrier conjugate multiplication in table 1 and the table 2, with sequence m=[+1 ,-1 ,-1 ,-1 ,+1 ,+1] dot product, the sequence sum of table 1 is a positive number, the sequence sum of table 2 is a negative.Therefore can utilize this characteristic as ACK and NACK sequence.Also can adopt in addition ,-the m sequence multiplies each other at receiving terminal.Just just in time opposite at the symbol of judging ACK/NACK.

The sequence a of table 1:DFT conversion input

Sequence number	Sequence a
		1	1+i，1+i，1-i，1-i，-1+i，-1-i， 1+i，-1-i，1-i，-1+i，-1+i，1+i

Sequence number	Sequence a
		2	1+i，1-i，1-i，-1-i，1-i，-1+i， -1-i，1-i，-1+i，-1-i，-1+i，-1+i
3	1-i，1-i，-1-i，-1-i，1+i，-1+i， 1-i，-1+i，-1-i，1+i，1+i，1-i
		4	1-i，-1-i，-1-i，-1+i，-1-i，1+i， -1+i，-1-i，1+i，-1+i，1+i，1+i
5	-1+i，1+i，1+i，1-i，1+i，-1-i， 1-i，1+i，-1-i，1-i，-1-i，-1-i
		6	-1+i，-1+i，1+i，1+i，-1-i，1-i， -1+i，1-i，1+i，-1-i，-1-i，-1+i
7	-1-i，-1+i，-1+i，1+i，-1+i，1-i， 1+i，-1+i，1-i，1+i，1-i，1-i
		8	-1-i，-1-i，-1+i，-1+i，1-i，1+i， -1-i，1+i，-1+i，1-i，1-i，-1-i

The order of note 1: a (n) sequence is: a (1), a (2), a (3), a (4), a (5), a (6), a (7), a (8), a (9), a (10), a (11), a (12)

Table 1 all has identical rule with table 2 herein.

The sequence a ' of table 2:DFT conversion input

Sequence number	Sequence a '
		1	1+i -1+i 1-i，1+i，1-i，1-i， -1-i，-1+i，-1+i，1+i，-1+i，1-i

Sequence number	Sequence a '
		2	1+i，-1-i，1-i，-1+i，-1+i，1+i， 1+i，1+i，1-i，1-i，-1+i，-1-i
3	1-i，1+i，-1-i，1-i，-1-i，-1-i， -1+i，1+i，1+i，1-i，1+i，-1-i
		4	1-i，-1+i，-1-i，1+i，1+i，1-i， 1-i，1-i，-1-i，-1-i，1+i，-1+i
5	-1+i，1-i，1+i，-1-i，-1-i，-1+i， -1+i，-1+i，1+i，1+i，-1-i，1-i
		6	-1+i，-1-i，1+i，-1+i，1+i，1+i， 1-i，-1-i，-1-i，-1+i，-1-i，1+i
7	-1-i，1+i，-1+i，1-i，1-i，-1-i， -1-i，-1-i，-1+i，-1+i，1-i，1+i
		8	-1-i，1-i，-1+i，-1-i，-1+i，-1+i， 1+i，1-i，1-i，-1-i，1-i，-1+i

For example adopt the arbitrary sequence in table 1 and the table 2 to represent ACK and NACK sequence respectively; Sequence after these two sequences change through DFT is respectively ACK1_DFT, NACK1_DFT.As shown in Figure 4, adopt the frequency domain incoherent detection.

Hypothetical sequence length gets 12, gets adjacent two symbols and carries out difference, and the user sends specific ACK sequence and makes the data A between the adjacent sub-carrier after the DFT _kA _K+1 ^*Imaginary part be 0, promptly the data after the DFT are (A ₁C ₁A ₁A ₂C ₂A ₂A ₆C ₆A ₆), C _i, i=1,2...6 is corresponding coefficient, for given sequence C _iBe constant.

The reception data are:

R _2i＝H _2iA _i+n _2i

R _2i+1＝H _2i+1C _iA _i+n _2i+1

Receiving terminal is done coherent computing to adjacent sub-carrier,

$S_i=R_{2i}{R}_{2i+1}^{*}=H_{2i}{H}_{2i+1}^{*}{A}_i{A}_i^{*}{C}_i+N_i,i=0,..5$

Because the characteristic of channel is very approaching between the adjacent sub-carrier, so H _iH _I+1 ^*Not phase place deflection significantly.

To calculated value S0, S1, S2, S3, S4, S5 multiply by sequence m=[+1 ,-1 ,-1 ,-1 ,+1 ,+1 respectively] and-m and to results added, according to gained result and 0 relatively,, be judged to NACK less than 0 if be judged to ACK greater than 0.If multiply by-m, judge that then the symbol of ACK/NACK is just in time opposite.

＜example two〉two users' coherent detection

Fig. 5 is the block diagram that shows two users' incoherent detection system, Fig. 6 is that the ACK/NACK sequence a and the b that show two users 1 of hypothesis and user 2 are the structure chart of A and B through the output sequence after the DFT conversion respectively, and Fig. 7 is the structure chart that shows the conversion of two users' list entries.Below in conjunction with Fig. 5, Fig. 6 and Fig. 7 an alternative embodiment of the invention is described.

Signal after embodiments of the invention are modulated through QPSK by the random sequence of seeking two users, has similar difference repeated encoding in DFT output, promptly adopt the frequency domain incoherent detection, the user sends specific ACK sequence and makes the data A between the adjacent sub-carrier after the DFT _kA _K+1 ^*Imaginary part be 0, and satisfy condition:

$|A_0{A}_1^{*}+A_4{A}_5^{*}+A_8{A}_9^{*}|=\mathrm{Max}$

$|B_2{B}_3^{*}+B_6{B}_7^{*}+B_{10}{B}_{11}^{*}|=\mathrm{Max}$

A wherein _k(k=0...11) be DFT data afterwards, Max=128.

If the data of two users' data a and b process DFT respectively as shown in Figure 6.

(1) the sequence a of user's one DFT conversion input

Method 1:

Sequence a1 in the table 3 satisfies:

+(A(1)*A(2)′)-(A(5)*A(6)′)-(A(9)*A(10)′)＝128

Sequence a1 ' in the table 4 satisfies:

-(A(1)*A(2)′)+(A(5)*A(6)′)+(A(9)*A(10)′)＝128

Therefore, multiply by sequence m=[+1 ,-1 ,-1 at receiving terminal] and-m after and to results added, the value of a1 and a1 ' is distinguished by positive sign and negative sign respectively, can be respectively as ACK and NACK sequence.Also can adopt in addition ,-the m sequence multiplies each other at receiving terminal.Just just in time opposite at the symbol of judging ACK/NACK.

Table 3: the sequence a1 of user 1DFT conversion input

Sequence number	User 1 row a
		1	1+i 1+i 1+i -1+i 1+i 1+i -1-i 1+i 1+i 1-i 1+i 1+i
2	1-i 1-i 1-i 1+i 1-i 1-i -1+i 1-i 1-i -1-i 1-i 1-i
		3	-1+i -1+i -1+i -1-i -1+i -1+i 1-i -1+i -1+i 1+i -1+i -1+i
4	-1-i -1-i -1-i 1-i -1-i -1-i 1+i -1-i -1-i -1+i -1-i -1-i

The order of note 1: a (n) sequence is: a (1), and a (2), a (3), a (4),

a(5)，a(6)，a(7)，a(8)，

a(9)，a(10)，a(11)，a(12)。

Table 3,4,5,6,7,8,9,10,11 all has identical rule with table 12 herein.

Table 4: the sequence a1 ' of user 1DFT conversion input

Sequence number	User one NACK sequence a ' 1 (n)
		1	1+i -1-i -1-i -1+i -1-i -1-i -1-i -1-i -1-i 1-i -1-i -1-i
2	1-i -1+i -1+i 1+i -1+i -1+i -1+i -1+i -1+i -1-i -1+i -1+i
		3	-1+i 1-i 1-i -1-i 1-i 1-i 1-i 1-i 1-i 1+i 1-i 1-i
4	-1-i 1+i 1+i 1-i 1+i 1+i 1+i 1+i 1+i -1+i 1+i 1+i

Method 2:

Sequence a2 in the table 5 satisfies:

+(A(1)*A(2)′)+(A(5)*A(6)′)-(A(9)*A(10)′)＝128

Sequence a2 ' in the table 6 satisfies:

-(A(1)*A(2)′)-(A(5)*A(6)′)+(A(9)*A(10)′)＝128

Therefore, multiply by sequence m=[+1 ,+1 ,-1 at receiving terminal] and-m after and to results added, the value of a2 and a2 ' is distinguished by positive sign and negative sign respectively, can be respectively as ACK and NACK sequence.Also can adopt in addition ,-the m sequence multiplies each other at receiving terminal.Just just in time opposite at the symbol of judging ACK/NACK.

Table 5: the sequence a2 of user 1DFT conversion input

Sequence number	User one ACK sequence a2 (n)
		1	1+i -1+i 1+i 1+i -1-i -1+i 1+i 1-i -1-i 1+i 1+i 1-i

Sequence number	User one ACK sequence a2 (n)
		2	1-i 1+i 1-i 1-i -1+i 1+i 1-i -1-i -1+i 1-i 1-i -1-i
3	-1+i -1-i -1+i -1+i 1-i -1-i -1+i 1+i 1-i -1+i -1+i 1+i
		4	-1-i 1-i -1-i -1-i 1+i 1-i -1-i -1+i 1+i -1-i -1-i -1+i

Table 6: the sequence a2 ' of user 1DFT conversion input

Sequence number	Sequence a2 '
		1	1+i 1-i -1-i 1+i 1+i 1-i 1+i -1+i 1+i 1+i -1-i -1+i
2	1-i -1-i -1+i 1-i 1-i -1-i 1-i 1+i 1-i 1-i -1+i 1+i
		3	-1+i 1+i 1-i -1+i -1+i 1+i -1+i -1-i -1+i -1+i 1-i -1-i
4	-1-i -1+i 1+i -1-i -1-i -1+i -1-i 1-i -1-i -1-i 1+i 1-i

(2) user two the ACK sequence b (n) that is input to DFT conversion end

Method 1:

Sequence b1 in the table 7 satisfies:

(B(3)*B(4)′)-(B(7)*B(8)′)+(B(11)*B(12)′)＝128

Sequence b1 ' in the table 8 satisfies:

-(B(3)*B(4)′)+(B(7)*B(8)′)-(B(11)*B(12)′)＝128

Therefore, multiply by sequence m=[+1 ,-1 ,+1 at receiving terminal] and-m after and to results added, the value of b1 and b1 ' is distinguished by positive sign and negative sign respectively, can be respectively as ACK and NACK sequence.Also can adopt in addition ,-the m sequence multiplies each other at receiving terminal.Just just in time opposite at the symbol of judging ACK/NACK.

Table 7: the sequence b1 of user's two DFT conversion inputs

Sequence number	User two sequence b1
		1	1+i 1+i -1-i 1-i -1-i 1+i -1-i 1+i -1-i -1+i -1-i 1+i
2	1-i 1-i -1+i -1-i -1+i 1-i -1+i 1-i -1+i 1+i -1+i 1-i
		3	-1+i -1+i 1-i 1+i 1-i -1+i 1-i -1+i 1-i -1-i 1-i -1+i
4	-1-i -1-i 1+i -1+i 1+i -1-i 1+i -1-i 1+i 1-i 1+i -1-i

Table 8: the sequence b1 ' of user's two DFT conversion inputs

Sequence number	User two NACK sequence b1 '
		1	1+i -1-i 1+i 1-i 1+i -1-i -1-i -1-i 1+i -1+i 1+i -1-i
2	1-i -1+i 1-i -1-i 1-i -1+i -1+i -1+i 1-i 1+i 1-i -1+i
		3	-1+i 1-i -1+i 1+i -1+i 1-i 1-i 1-i -1+i -1-i -1+i 1-i

Sequence number	User two NACK sequence b1 '
		4	-1-i 1+i -1-i -1+i -1-i 1+i 1+i 1+i -1-i 1-i -1-i 1+i

Method 2:

Sequence b2 in the table 9 satisfies:

(B(3)*B(4)′)-(B(7)*B(8)′)-(B(11)*B(12)′)＝128

Sequence b2 ' in the table 10 satisfies:

-(B(3)*B(4)′)+(B(7)*B(8)′)+(B(11)*B(12)′)＝128

Therefore, multiply by sequence m=[+1 ,-1 ,+1 at receiving terminal] and-m after and to results added, the value of b1 and b1 ' is distinguished by positive sign and negative sign respectively, can be respectively as ACK and NACK sequence.Also can adopt in addition ,-the m sequence multiplies each other at receiving terminal.Just just in time opposite at the symbol of judging ACK/NACK.

Table 9: the sequence b2 of user's two DFT conversion inputs

Sequence number	User two ACK sequence b2 (n)
		1	1+i -1+i -1-i -1-i 1+i -1+i 1+i 1-i 1+i -1-i -1-i 1-i
2	1-i 1+i -1+i -1+i 1-i 1+i 1-i -1-i 1-i -1+i -1+i -1-i
		3	-1+i -1-i 1-i 1-i -1+i -1-i -1+i 1+i -1+i 1-i 1-i 1+i
4	-1-i 1-i 1+i 1+i -1-i 1-i -1-i -1+i -1-i 1+i 1+i -1+i

Table 10: the sequence b2 ' of user's two DFT conversion inputs

Sequence number	User two sequence b2 '
		1	1+i 1-i 1+i -1-i -1-i 1-i 1+i -1+i -1-i -1-i 1+i -1+i
2	1-i -1-i 1-i -1+i -1+i -1-i 1-i 1+i -1+i -1+i 1-i 1+i
		3	-1+i 1+i -1+i 1-i 1-i 1+i -1+i -1-i 1-i 1-i -1+i -1-i
4	-1-i -1+i -1-i 1+i 1+i -1+i -1-i 1-i 1+i 1+i -1-i 1-i

Receiving terminal receives data:

R _2i＝H _2iA _i+n _2i

R _2i+1＝H _2i+1C _iA _i+n _2i+1

Receiving terminal is done coherent computing to adjacent sub-carrier,

$S_i=R_{2i}{R}_{2i+1}^{*}=H_{2i}{H}_{2i+1}^{*}{A}_i{A}_i^{*}{C}_i+N_i,i=0,..5$

Because the characteristic of channel is very approaching between the adjacent sub-carrier, so H _iH _I+1 ^*Not phase place deflection significantly.

For user one, to calculated value S ₀, S ₂, S ₄Multiply by corresponding sequence m respectively, and relatively, if greater than 0 ACK that is judged to user one, less than 0 NACK that is judged to user one according to gained result and 0.

For user two, to calculated value S ₁, S ₃, S ₅Multiply by corresponding sequence m respectively, and relatively, if greater than 0 ACK that is judged to user two, less than 0 NACK that is judged to user two according to gained result and 0.

Other are had the modulation system of a plurality of subcarriers, and as OFDM etc., this differential modulation and demodulation scheme can be suitable for equally.

In sum, the physical layer link of technology such as employing HARQ requires up link to send the control signals such as ACK/NACK of a bit for each downlink data packet of receiving.Traditional coherence detection needs to send reference signal, has consumed a large amount of running time-frequency resources.The present invention is at the employing special sequence of making a start, and the base station end does not need channel information, but utilizes the class difference characteristic of special sequence formation that ACK/NACK information is detected, and has saved resource, has improved utilance, and realizes simply having good detection performance.

Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. the HARQ feedback signal generation method based on the modulation of discrete Fourier variation spread-spectrum orthogonal frequency division multiplexing is characterized in that, may further comprise the steps:

Step S202 seeks random sequence, and first sequence of wherein said random sequence through forming after the ovennodulation satisfies first condition through sending second sequence that forms after the pre-treatment, and wherein, described transmission pre-treatment is discrete Fourier transform;

Step S204 continues to seek the pair of sequences that satisfies second condition from the described random sequence that searches out, in order to characterize described HARQ feedback signal;

Step S206, the carrying feedback information sends on described pair of sequences; And

Step S208, receiving terminal is handled the sequence that receives, and judges the described feedback information that is carried according to result, comprising:

With the adjacent two symbols conjugate multiplication in the sequence that receives and carry out reversal; And

With after the reversal every the result's and with 0 compare, judge feedback information according to comparative result;

Wherein:

Described first condition is: the result of the adjacent two symbols conjugate multiplication of described second sequence is a real number,

Described second condition is: the result of the adjacent two symbols conjugate multiplication of a sequence in the described pair of sequences and the adjacent two symbols of another sequence in the described pair of sequences or two or more symbol conjugate multiplication of arranging by pre-defined rule come to the same thing opposite in sign.

2. HARQ feedback signal generation method according to claim 1 is characterized in that described modulation comprises QPSK, 16QAM, 64QAM, 256QAM, 1024QAM and 4096QAM.

3. HARQ feedback signal generation method according to claim 1 is characterized in that the sequence length of described first sequence is an even number.

4. the HARQ feedback signal generating means based on the modulation of discrete Fourier variation spread-spectrum orthogonal frequency division multiplexing is characterized in that, comprising:

First seeks the unit, is used to seek random sequence, and first sequence of wherein said random sequence through forming after the ovennodulation satisfies first condition through sending second sequence that forms after the pre-treatment, and wherein, described transmission pre-treatment is discrete Fourier transform;

Second seeks the unit, is used for continuing to seek the pair of sequences that satisfies second condition from the described random sequence that searches out, in order to characterize described HARQ feedback signal;

Transmitting element is used for carrying feedback information and sends on described pair of sequences; And

Judging unit is used for the sequence that receives is handled, and judges the described feedback information that is carried according to result, comprising: with the adjacent two symbols conjugate multiplication in the sequence that receives and carry out reversal; And with after the reversal every the result's and with 0 compare, judge feedback information according to comparative result;

Wherein:

Described first condition is: the result of the adjacent two symbols conjugate multiplication of described second sequence is a real number,

Described second condition is: the result of the adjacent two symbols conjugate multiplication of a sequence in the described pair of sequences and the adjacent two symbols of another sequence in the described pair of sequences or two or more symbol conjugate multiplication of arranging by pre-defined rule come to the same thing opposite in sign.

5. HARQ feedback signal generating means according to claim 4 is characterized in that described modulation comprises QPSK, 16QAM, 64QAM, 256QAM, 1024QAM and 4096QAM.

6. HARQ feedback signal generating means according to claim 4 is characterized in that, the sequence length of described first sequence is an even number.

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