Sequence allocation method and device

Abstract

The invention provides a sequence distribution method and a corresponding sequence transmitting and receiving method and a device thereof. Sequences in each sequence group are divided into a plurality of subgroups; the sequences in each subgroup are obtained by being selected from a candidate sequence set corresponding to the subgroup according to certain rules; the determined sequences are allocated to a subarea by the system. As for the subgroup m, a function fm(question mark) corresponding to the subgroup is determined and the definition domain of the function is the candidate sequence set corresponding to the subgroup; wherein, the sequences in the subgroup m 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 (fm (question mark), Gk) to be smaller, wherein, k is a group number of the sequence group, m is a sequence number of the subgroup, n is a natural number depending on m, 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 tables for storing the large-scale sequence group are required, thus the complexity of the system is reduced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a communication sequence allocation technology. Background technique [0002] In a communication system, a constant amplitude zero auto-correlation sequence (CAZAC, constant amplitude zero auto-correlate) sequence 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] Due to its above-mentioned properties, the sequence in the frequency domain is also a CAZAC sequence after Fourier transform. Such characteristics are especially suitable for use as a reference signal in communication, for channel estimation, and so on. [0006] For example, in a single carrier frequency division multip...

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Problems solved by technology

However, the user's data bandwidth often has different bandwidths and locations at different times according to certain scheduling rules. Therefore, the way the reference signal sequences of different cells occupy time-frequency resources will also change from time to time, resulting in different interference between cells. Effect of Length Serial Correlation

What's more serious is that since the system usually utilizes the shift-related characteristics of the sequence to obtain multiple code-divided orthogonal sequences through different cyclic time shifts and distribute them to different users, once the sequence of two lengths If there is strong interference between them, then there will be strong interference between all users using sequences of these two lengths

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