Method and device for generating even-length mirror symmetric sequence

Abstract

The invention discloses a method and device for generating an even-length mirror symmetric sequence. The method comprises the following step: a new even length sequence is obtained by an odd-length centrosymmetric sequence by inserting a code element which is the same as a central code element before or after the central code element, wherein the front half section of the code element and the rear half section of the code element of the new sequence have mirror symmetric property. An even length centrosymmetric sequence set can be generated by using the same method. The length of the new sequence can be selected according to actual application requirement, and the acquired sequence set has autocorrelation with an approximate impulse characteristic and lower cross-correlation. Meanwhile, a sequence group with good anti-frequency-offset property can be obtained by proper selection from the sequence set, and the sequence set can be used in synchronization of a wireless communication system.

Description

Technical field [0001] The present invention relates to a communication sequence, in particular to a communication system that can achieve synchronization of a communication system, symbol mirror symmetry, and has similar impulse cycle autocorrelation characteristics under the LTE framework, small cycle cross-correlation characteristics and good anti-frequency offset characteristics The method of generating periodic sequence sets. Background technique [0002] Mobile communications are developing rapidly towards standard globalization, large capacity, high spectrum efficiency and multimedia services. The world’s leading 3G technical specification organization-the Third Generation Partnership Project (3GPP, 3 rd generation partnership project) aims to study, formulate and promote standards based on the evolution of the GSM core network. Its goal is to realize the smooth transition of the new generation network from the existing network, ensure the forward and backward compatibilit...

AI Technical Summary

Problems solved by technology

[0003] In essence, even-length ZC sequences have mirror symmetry properties, but the cross-correlation function when forming a sequence set is not good

Non-zero side lobes of the autocorrelation function lead to multipath interference, and non-zero cross-correlation functions lead to multiple access interference

In particular, for a UE at the edge of a cell in a multi-cell system, the primary synchronization sequence of its current serving cell will be superimposed on the primary synchronization sequence of the neighboring cell, and these superimposed primary synchronization sequences will be cross-correlated with the local primary synchronization sequence of the UE These cross-correlation peaks will be superimposed on the autocorrelation. When the cross-correlation is too large, it will cause obvious interference to the autocorrelation, thereby reducing the synchronization performance of the UE, and the denser the cell distribution, the smaller the cell radius, the lower the synchronization performance. falling harder

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