ZC sequence generation method and system

Abstract

The invention discloses a ZC sequence generation method and system, and aims to solve the problems that more RAM and DSP resources need to be consumed and longer time delay is generated when a ZC sequence is generated in the prior art. The method comprises the steps of firstly calculating a first increment value u; adding a first increment value u to the corresponding second increment value step when the iteration frequency k is equal to the iteration frequency k-1; adding a second increment value step corresponding to the iteration times k to the third increment value sum corresponding to theiteration times k-1 when the iteration times k are equal to the iteration times k-1; wherein the first increment value u, the second increment value step and the third increment value sum which are obtained through calculation are in a range of + / -N / 2, and finally, taking the third increment value sum which meets the iteration times as an address index of a lookup table, reading the lookup tablevalue, and determining the ZC sequence. Compared with the prior art, the method has the advantages of simple structure, low resource consumption, short time delay and the like.

Description

technical field [0001] The invention relates to the technical field of ZC sequence generation, in particular to a method and system for generating a ZC sequence. Background technique [0002] The full name of ZC sequence is Zadoff_Chu sequence, which belongs to the category of CAZAC sequence. The simplified formula for odd-length ZC sequences is x zc_r (n)=exp(-j*pi*zc_r*k*(k+1) / N), k=0, 1, 2, . . . N-1. In the TDD system, N is 139, and zc_r represents the physical root value, and the values ​​are 1, 2,...138. Since the ZC sequence has constant amplitude and zero autocorrelation characteristics, it is widely used in the random access preamble sequence in the uplink and downlink systems of LTE. However, at present, most of the multipliers and lookups used to generate the ZC sequence are used to generate the ZC sequence, or a method with a long delay such as step-by-step remainder is used. Such an implementation method will consume more RAM and DSP resources or generate lo...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method and system for generating a ZC sequence, so as to solve the problem that more RAM and DSP resources are consumed and longer time delays are generated in the prior art to generate a ZC sequence

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