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Frequency offset estimation method based on adjustability of data-aided accuracy

A technology for frequency offset estimation and accuracy, which can be used in carrier adjustment, digital transmission systems, modulated carrier systems, etc., and can solve problems such as estimation accuracy attenuation.

Active Publication Date: 2016-11-09
PEKING UNIV
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Problems solved by technology

However, under the Rayleigh channel condition, according to the simulation results, the estimation accuracy of the M&M algorithm is greatly attenuated compared with the other two algorithms

Method used

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  • Frequency offset estimation method based on adjustability of data-aided accuracy
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  • Frequency offset estimation method based on adjustability of data-aided accuracy

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Embodiment Construction

[0032] 1. Assume that the symbol sequence of length L sent is C k ={c 1 ,c 2 ,... c n},and

[0033] 2. The sampling symbol sequence obtained after the receiver A / D converts the received symbol sequence can be expressed as x(k)=c k e j (2πfkT+θ) +n(k), where k is the symbol ordinal, c k is the symbol sequence in the transmitted symbol sequence, f is the frequency offset to be estimated, T is the symbol period, θ is the symbol modulation angle, and n(k) is the noise term of the kth received symbol.

[0034] 3. Perform two similar autocorrelation operations on the sampling symbol sequence x(k) to obtain the R function carrying the angle deflection signal, as follows

[0035] z ( k ) = Δ x ( k ) c k * = e j ...

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Abstract

The invention discloses a frequency offset estimation method based on adjustability of data-aided accuracy. According to the method, by calculating angle difference values of x adjacent R functions, a frequency offset value is estimated, wherein the R functions are functions which are calculated by a receiver according to a received symbol sequence and carry angle deflection angles. Formulas of calculating the frequency offset value are that: (with reference to the specification), and x is smaller than or equal to N-1 and greater than or equal to 2 and is an even number; (with reference to the specification), and x is smaller than or equal to N-1 and greater than or equal to 3 and is an odd number; and m is smaller than or equal to N and greater than or equal to 1, and N is a positive integer not greater than L-1. Under the flat fading channel condition, the method has higher accuracy than an M&M algorithm and has a wider estimation range than an L&R algorithm and a Fitz algorithm.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and in particular relates to frequency deviation estimation of a received signal by a digital receiver in a single-carrier communication system. Background technique [0002] Carrier frequency offset estimation is one of the main problems in the research of digital receivers. The common method is to use a dedicated phase-locked loop chip to build a hardware module. However, the hardware method has long response time, relatively narrow measurement bandwidth, and frequency tracking accuracy. and unstable accuracy. The method of implementing frequency offset estimation in the digital domain can effectively solve the above problems. According to whether training sequence assistance is required, it can be divided into data-assisted (data-aided, DA) and non-data-aided (non-data-aided, NDA), The classic algorithms under data-assisted conditions include maximum likelihood function method, ...

Claims

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Application Information

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IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 姚金城肖如吾张竟枢李斗赵玉萍
Owner PEKING UNIV
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