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A method for utilizing the synchronization header pre-distortion to eliminate frequency deviation in communication system

A frequency offset, communication system technology, applied in multiplexing communication, orthogonal multiplexing system, multi-frequency code system and other directions, can solve the judgment error, the base station cannot complete the demodulation, and the terminal does not realize the frequency offset. It can achieve the effect of simple and convenient on-site construction and elimination of frequency offset.

Inactive Publication Date: 2009-12-02
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the terminal uses the synchronization head to calculate the frequency deviation, there is always a frequency deviation Δθ=θ1-θ2, which leads to wrong judgments
And because the terminal does not implement the correct frequency offset cancellation, the base station cannot complete the correct demodulation

Method used

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  • A method for utilizing the synchronization header pre-distortion to eliminate frequency deviation in communication system
  • A method for utilizing the synchronization header pre-distortion to eliminate frequency deviation in communication system
  • A method for utilizing the synchronization header pre-distortion to eliminate frequency deviation in communication system

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Embodiment Construction

[0028] Taking the SCDMA system as an example, the specific application of the method of the present invention will be described in detail in conjunction with the accompanying drawings. It should be understood that the method of the present invention can be used in any communication system that can use downlink signals of base stations to eliminate frequency deviation of terminals.

[0029] like figure 2 As shown, when using the method of the present invention to eliminate the frequency offset of the SCDMA system, the terminal first adopts the existing frequency elimination method mentioned in the background technology section, and eliminates the sync header according to the sync header in the received downlink signal After the frequency offset of the data signal.

[0030] From the existing frequency offset elimination algorithm in the background technology, it can be known that the frequency offset of the sync header is not necessarily the same as the frequency offset of the ...

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Abstract

The present invention relates to a method for eliminating frequency offset in a communication system by using sync header predistortion, which comprises the following steps: (1) the terminal eliminates the frequency offset of the data signal after the sync header according to the received sync header; (2) Observing the constellation diagram of the data signal obtained in step (1) and the receiving signal-to-noise ratio of the data signal output after calculation by the terminal, determining the constellation diagram rotation angle of the data signal after the frequency offset is removed; (3) The constellation diagram rotation angle of the data signal after the frequency offset is eliminated is used as the sync header pre-distortion value, and the sync header pre-distortion value is configured through the network management; (4) the base station performs pre-distortion processing according to the sync header pre-distortion value configured by the network management And send the downlink signal after the pre-distortion processing; (5) The terminal eliminates the frequency offset of the data signal after the sync header according to the sync header after the pre-distortion processing. With the help of the method, the frequency offset in the communication system can be eliminated accurately and effectively, and the normal operation of the system is guaranteed.

Description

technical field [0001] The invention relates to a method for eliminating frequency offset in a communication system, in particular to a method for eliminating frequency offset in a communication system by using synchronous header predistortion. Background technique [0002] In the SCDMA system, since the base station transmitter and the terminal receiver use completely independent clocks, there must be a frequency deviation between the two. At the same time, due to the relative motion between the base station and the terminal, the Doppler effect also makes the terminal and the base station produce The frequency deviation causes the residual carrier component to remain in the baseband signal after the IF demodulation of the terminal. When the residual carrier accumulates to a certain extent, misjudgment will occur. Since the master clocks at the receiving and sending ends change independently, the residual carrier also changes. The terminal needs to perform real-time frequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 袁进李凯金晶刘津京
Owner BEIJING XINWEI TELECOM TECH
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