Sequence allocation and processing method and device for communication system

A sequence allocation and communication system technology, applied in the field of communication, can solve the problems of complicated cell interference, etc., and achieve the effect of reducing complexity and less interference

Active Publication Date: 2008-09-10
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0018] To sum up, when sequences occupy time-frequency resources in different ways, the problem of interference between cells is relatively complicated

Method used

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  • Sequence allocation and processing method and device for communication system
  • Sequence allocation and processing method and device for communication system
  • Sequence allocation and processing method and device for communication system

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Experimental program
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specific Embodiment approach 1

[0067] In a specific embodiment of the present invention, the system assigns sequence groups to cells / users / channels, wherein the sequences in each sequence group are divided into multiple sequence subgroups; each sequence subgroup corresponds to a way of occupying time-frequency resources, The time-frequency resource occupation mode in the communication system is in one-to-one correspondence with the sequence subgroups; the sequences in each subgroup are selected and generated from the candidate sequence set corresponding to the subgroup according to certain rules. According to the allocated sequence group and the specific time-frequency resource occupation mode of the transmitted signal, the user or channel selects the sequence in the sequence subgroup corresponding to the time-frequency resource occupation mode of the transmitted signal in the allocated sequence group for transmission. or receive.

[0068] The specific rules above are: for any subgroup i, determine the func...

example 1

[0143] There are 4 subgroups in this embodiment, and the sequence candidate sets are N respectively. 1 =11,N 2 =23,N 3 =37,N 4 =47 Zadoff-Chu sequence, take the fourth sequence group as an example, when k=4, step 1101, obtain v 4，i and u 5，i i∈{1, 2, 3, 4}, specifically:

[0144] For subgroup 1, v 4，1 = 1 / (2×11), u 5，1 =-1 / (2×11).

[0145] Pair group 2, right 4，1 =v 4，1 +4 / 11=1 / (2×11)+4 / 11, left 5，1 = u 5，1 +5 / 11=-1 / (2×11)+5 / 11; there is no r that satisfies the condition 5，1 and r 4，1 , so v 4，2 =v 4，1 , ie v 4，2 =1 / (2×11); u 5，2 = u 5，1 , namely u 5，2 =-1 / (2×11).

[0146] Pair group 3, right 4，2 =v 4，2 +4 / 11=1 / (2×11)+4 / 11, left 5，2 = u 5，2 +5 / 11=-1 / (2×11)+5 / 11;

[0147] to N 2 = 23, change r 2 , get when r 5，2 = 10 o'clock r 5，2 / N 2 -left 5，2 >0 and |r 5，2 / N 2 -left 5，2 | Takes the minimum value due to r 5，2 / N 2 -1 / 2(N 2 )-right 4，2 >0, so v 4，3 =v 4，2 , ie v 4，3 =1 / (2×11);

[0148] to N 2 = 23, change r 2 , get when r 4，2 = 9 o'...

example 2

[0170] When the number of subgroups in the sequence group is more, it will be found that u and v are calculated. After a certain subgroup is calculated, u and v of other longer sequence subgroups will not change. Specifically, for a system bandwidth of 5M, N 1 =11,N 2 =23,N 3 =37,N 4 =47,N 5 =59,N 6 =71,N 7 =97,N 8 =107,N 9 =113,N 10 =139,N 11 =179,N 12 =191,N 13 =211,N 14 =239,N 15 =283,N 16 =293. Take the fourth sequence group as an example, namely k=4, v 4，i and u 5，i i ∈ {1, 2, 3, ..., 16} is obtained as follows:

[0171] For subgroup 1, v 4，1 = 1 / (2×11), u 5，1 =-1 / (2×11).

[0172] Pair group 2, right 4，1 =v 4，1 +4 / 11=1 / (2×11)+4 / 11, left 5，1 = u 5，1 +5 / 11=-1 / (2×11)+5 / 11; there is no r that satisfies the condition 5，1 and r 4，1 , so v 4，2 =v 4，1 , ie v 4，2 =1 / (2×11); u 5，2 = u 5，1 , namely u 5，2 =-1 / (2×11).

[0173] Pair group 3, right 4，2 =v 4，2 +4 / 11=1 / (2×11)+4 / 11, left 5，2 = u 5，2 +5 / 11=-1 / (2×11)+5 / 11;

[0174] to N 2 = 23, change r...

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Abstract

The embodiment of the invention provides a sequence distribution and processing method in a communication system and a corresponding device thereof. Sequences in each sequence group are divided into a plurality of subgroups; the sequences in each subgroup are obtained by selecting from a candidate sequence set corresponding to the subgroup according to a certain rule; definite sequences are distributed to a subarea by the system. As for the subgroup i, a function fi (question mark) corresponding to the subgroup is determined and a domain of definition of the function is the candidate sequenceset corresponding to the subgroup; the sequences in the subgroup i of the sequence group k are determined by selecting n sequences in the candidate sequence set while the sequences cause values of a function d (fi (question mark), Gk) to be smaller, wherein, k is a group number of the sequence group, i is a sequence number of the subgroup, n is a natural number, d(a, b) is a binary function and Gk is a value determined by the group number k. The occurrence of the sequence highly correlative to a certain length of the sequence can be avoided in other sequence groups, thus reducing strong interference. No substantial tables of the sequence group are required to be stored so as to reduce the complexity of the system.

Description

technical field [0001] The invention relates to the communication field, in particular to a sequence allocation technology in a communication system. Background technique [0002] In communication systems, a class of sequences with constant amplitude zero autocorrelation (CAZAC, constant amplitude zero auto-correlation) is a very important communication resource. Its characteristics are specifically: [0003] ■ The modulus of the amplitude is a constant value, for example, it can be normalized to 1. [0004] ■Zero-period autocorrelation, except for the maximum correlation with itself, other cyclic shift autocorrelations of the sequence itself are zero. [0005] Since the CAZAC sequence has the above properties, the sequence in the frequency domain is also a CAZAC sequence after Fourier transform. The sequence with this characteristic is suitable as a reference signal in communication, for channel estimation and so on. [0006] For example, in a single carrier frequency d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/00H04Q7/38H04L27/00
Inventor 曲秉玉何玉娟冯瑄
Owner HUAWEI TECH CO LTD
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