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Method and device for frequency deviation compensation of mobile communication system

A technology of mobile communication system and frequency offset compensation, applied in the direction of phase modulation carrier system, etc., can solve the problems of large amount of calculation and complex implementation, and achieve the effect of small amount of calculation, simple implementation and high precision

Inactive Publication Date: 2005-03-02
ZTE CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method requires demodulation twice at the receiving end, modulation once, phase offset estimation once, and compensation once, so the implementation is complex and the amount of calculation is very large

Method used

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  • Method and device for frequency deviation compensation of mobile communication system
  • Method and device for frequency deviation compensation of mobile communication system
  • Method and device for frequency deviation compensation of mobile communication system

Examples

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] A method and device for frequency offset compensation of a mobile communication system according to the present invention, such as figure 1 As shown, it is an overall implementation block diagram of frequency offset estimation and compensation, which includes four parts: an early stage frequency offset compensator 110 , a frequency offset and phase shift discriminator 120 , a phase shift compensator 130 , and a loop filter 140 .

[0037] The pre-frequency offset compensator 110 uses the frequency offset estimate Δf' from the loop filter 140 to perform frequency pre-compensation on the current I and Q two-way modulation symbols to obtain x n +iy n , and output to the frequency offset and phase shift discriminator 120 and the phase shift compensator 130 at the same time.

[0038] The specific implementation of the pre-stage frequency offset compensator 110 is:...

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PUM

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Abstract

This invention relates to frequency-offset compensation method and a device immobile communication system. The device includes a pre-frequency set compensator, a frequency-offset and phase shift discriminator, a phase shift compensator and a ring circuit filter. The said pre-offset compensator utilize the evaluation to the offset from the filer to carry out pre-compensation to the current two modulation symbols and output it to the discriminator and phase shift compensator, the discriminator utilizes two-dimension non-linear estimation for offset estimation and correction, the compensator compensates the current modulation symbols.

Description

technical field [0001] The present invention relates to a method and device for compensating frequency offset generated by mobile communication, in particular to a novel frequency offset compensation method and device for TD-SCDMA system or other communication systems using M-PSK modulation. Background technique [0002] In the mobile communication system, the sender modulates the information to the carrier fc, and the receiver must regenerate the carrier to receive the information accurately. Although the carrier is known in advance by both the sender and the receiver in name, because of the following two main factors in the transmission The reason is that there is a frequency offset between the sender and the receiver: 1. The accuracy of the local clock of the mobile station is not high; 2. The Doppler frequency shift caused by the position movement of the mobile station. [0003] The existing frequency compensation method of TD-SCDMA system is: re-modulate the demodulated...

Claims

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Application Information

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IPC IPC(8): H04L27/22
Inventor 曾召华曹昊嘉
Owner ZTE CORP
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