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Pseudo-random phase sequence for time-frequency estimation and time-frequency estimation method

A pseudo-random phase and time-frequency estimation technology, applied in the field of communication, can solve the problem of unsuitable pilot frequency for multi-user communication systems

Pending Publication Date: 2021-09-10
恒盟海外科技有限公司
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Problems solved by technology

[0004] Patent EP0952713A2 proposes a method for time-frequency estimation using chirp signals, which can estimate frequency offset and time offset at the same time, but since there are only two types of chirp signals of a specific length (ie, upper and lower chirps), it is not suitable for multi-user communication System pilot

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[0119]In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

[0120] figure 1 Shown is the time-frequency estimation flowchart of the frequency domain correlation method of the present invention, the received baseband sampling signal rx of a pilot symbol length is multiplied with the local reference signal xChirp (Rm) and xChirp (Rn) respectively to obtain the time domain correlation result rx (Rm...

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Abstract

The invention provides a pseudo-random phase sequence for time-frequency estimation, and the phase sequence is characterized in that the phase sequence has a linear time-frequency characteristic and has good self-correlation and cross-correlation characteristics, so a group of pilot frequency symbols which are not correlated pairwise can be constructed by utilizing the pseudo-random phase sequence, and are used for a multi-user communication system. Furthermore, the invention provides a method for constructing pilot symbols by using the pseudo-random phase sequence pairs, which comprises parallel pilot symbols and serial pilot symbols. Furthermore, the invention provides a method for performing time frequency estimation by adopting frequency domain correlation and time domain circumference correlation based on the pilot frequency symbol, and the key technology of pilot frequency of a multi-user communication system is solved.

Description

technical field [0001] The invention relates to a communication technology, in particular to a pseudo-random phase sequence time-frequency estimation method for time-frequency estimation. Background technique [0002] The constant envelope zero autocorrelation sequence (CAZAC) is widely used in the field of communication because of its constant envelope, ideal circular autocorrelation, and good cross-correlation. Currently, there are Zadoff-chu sequences, Frank sequences, and Golomb sequences. Phase sequence and Chirp sequence, etc., in fact, they can all be regarded as pseudo-random phase sequences. [0003] General communication systems use their above characteristics to use them as pilot signals to realize synchronization estimation. [0004] Patent EP0952713A2 proposes a method for time-frequency estimation using chirp signals, which can estimate frequency offset and time offset at the same time, but since there are only two types of chirp signals of a specific length (...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2602H04L27/2675
Inventor 徐龙艳
Owner 恒盟海外科技有限公司
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