Pseudorandom sequence generating method

A technology of pseudo-random sequence and random sequence, which is applied in the field of generation of pseudo-random sequence, and can solve the problem that random sequence has no effective solution

Inactive Publication Date: 2008-02-27
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, no effective solution has been proposed for how to generate random sequences satisfying the above conditions

Method used

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Examples

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Embodiment Construction

[0021] In this embodiment, a method for generating a pseudo-random sequence is provided.

[0022] As shown in Figure 1, the method for generating a pseudo-random sequence according to this embodiment includes: step S102, setting one or more (t) time-domain random sequences that maintain a constant model in the frequency domain as the initial set of pseudo-random sequences Sequences, wherein the cubic metric (CM) of the initial sequence of the pseudo-random sequence set is less than a predetermined CM threshold value, and the cross-correlation between them is less than a predetermined cross-correlation threshold value;

[0023] Step S104, generating one or more random sequences that maintain a constant model characteristic in the frequency domain, and performing an inverse Fourier transform on the one or more random sequences in the frequency domain;

[0024] Step S106, removing sequences whose CM is greater than a predetermined CM threshold value from the time domain sequences...

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Abstract

This invention relates to a method for generating false random sequences including: setting one or multiple time domain random sequences keeping constant mode property in the time domain as the intial sequences of a false random sequence set, generating one or multiple frequency domain random sequences of constant mode and making Fourier inversion to them, eliminating sequences with CM greater than a predesigned CM threshold value from the time domain sequences got by the inversion and taking the rest as the mutuallity set being selected and comparing them to eliminate sequences with the mutuality greater than a preset threshold value of mutuality among sequences from the being selected and the false random sequence set to get a new mutuality sequence to be selected to be corss correlated and eliminated sequences with the value greater than the preset threshold value of mutuality to form the rest sequences and those in the false random sequence set to a new false random sequence set.

Description

technical field [0001] The present invention relates to the field of digital communication, and in particular, to a method for generating a pseudo-random sequence. Background technique [0002] In the uplink frame structure of the LTE (Long Term Evolution, Long Term Evolution) system, there are two types of signals, reference signal and data information. Wherein, each type of reference signal is modulated by a known reference sequence at the receiving end. In LTE, in order to distinguish users, each reference sequence is required to be cyclically shifted orthogonally (or nearly orthogonally) in the time domain; in order to reduce inter-cell interference, it is required that the cross-correlation of each reference sequence be small; at the same time, in order to ensure a relatively The low peak-to-average ratio requires that the CM (Cubic Metric, three measurements) of all reference sequences be smaller than the CM of QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/18G06F7/58
Inventor 薛妍夏树强
Owner ZTE CORP
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