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.
CN100566320CInactive Publication Date: 2009-12-02BEIJING XINWEI TELECOM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING XINWEI TELECOM TECH
Publication Date
2009-12-02
Estimated Expiration
Not applicable · inactive patent

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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.
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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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