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Method for increasing the estimation performance to carrier frequency deviation of OFDM communication system

A carrier frequency offset, multiplexing communication technology, applied in orthogonal multiplexing system, multiplexing communication, multi-carrier system and other directions, can solve the problem of MLE algorithm performance degradation and so on

Inactive Publication Date: 2003-02-19
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the actual channel is a multipath time-varying fading channel, the signal power fluctuates violently with time, which will cause the performance of this MLE algorithm to degrade.

Method used

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  • Method for increasing the estimation performance to carrier frequency deviation of OFDM communication system
  • Method for increasing the estimation performance to carrier frequency deviation of OFDM communication system
  • Method for increasing the estimation performance to carrier frequency deviation of OFDM communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: see figure 2 .

[0029] In the first step, the MLE algorithm is used to estimate the carrier frequency offset for the continuous L training sequences, and L maximum likelihood carrier frequency offset estimates are obtained (i=0,1,...,L-1);

[0030] The second step is to choose an appropriate adaptive weighting factor G i (i=0, 1, ..., L-1), make the combined carrier frequency offset estimation value ξ ^ L = Σ i = 0 L - 1 G i ξ ^ i Σ i = 0 ...

Embodiment 2

[0038] Example 2, see image 3 .

[0039] Except that (2) step weighting factor selection is different, other steps are the same with embodiment 1: each weighting factor is all selected as any same numerical value a, then ξ ^ L = Σ i = 0 L - 1 a ξ ^ i Σ i = 0 L - 1 a = Σ i = ...

Embodiment 3

[0040] Example 3, see Figure 4 .

[0041] Except that the selection of weighting factors in step (2) is different, other steps are the same as in embodiment 1: first select the max The carrier frequency offset estimate of , and then press the formula to select the weighting factor but ξ ^ L = Σ i = 0 L - 1 G ~ i ξ ^ i Σ i = 0 L - 1 ...

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Abstract

A method of increasing carrier frequency diviation estimation performance of cross FDM communication system includes the three following steps: 1/to estimate the carrier frequency divination to the continuous L train sequences with the known MLE 2/to select the weighted factors with ant one of the following three methods; to use the received signal power as the approximate value of the weighted factor when signals/noise ration is far more larger than 1. Every weighted factor should select the same value a; selecting carrier frequency divination estimation value with the largest signal/noise ratio as the weighted factor 3/combining number L ML carrier frequency divination estimation values with the weighted factor to get the optimized carrier frequency divination estimation valve.

Description

technical field [0001] A method for improving carrier frequency offset estimation performance of an Orthogonal Frequency Division Multiplexing (OFDM) communication system belongs to the technical field of Orthogonal Frequency Division Multiplexing communication. Background technique [0002] As an effective broadband transmission technology, Orthogonal Frequency Division Multiplexing (OFDM) technology has attracted much attention in the field of communication, and has been widely used in wireless local area network, digital audio broadcasting, and digital video broadcasting. But OFDM signal is very sensitive to carrier frequency offset. Since the carrier frequency offset will destroy the orthogonality between the subcarriers of the OFDM signal, it will cause inter-subchannel crosstalk (ICI) while causing a decrease in the signal-to-noise ratio, which will significantly increase the symbol error rate of OFDM signal reception. Therefore, in OFDM signal processing, whether a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/32
Inventor 雷文陆建华陶涛
Owner TSINGHUA UNIV
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