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Method of frequency compensation for Direct Sequence Spread Spectrum (DSSS) mobile communication system

A mobile communication system, direct sequence spread spectrum technology, applied in the transmission system, electrical components, etc., can solve the problem of not being able to optimize the demodulation performance of the peaker

Active Publication Date: 2005-09-21
WUHAN HONGXIN TELECOMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This method can compensate the average frequency offset components of multiple multipaths at radio frequency and intermediate frequency, but it cannot make each multipath obtain good frequency compensation, so that the demodulation performance of each finger cannot be maximized. excellent

Method used

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  • Method of frequency compensation for Direct Sequence Spread Spectrum (DSSS) mobile communication system
  • Method of frequency compensation for Direct Sequence Spread Spectrum (DSSS) mobile communication system
  • Method of frequency compensation for Direct Sequence Spread Spectrum (DSSS) mobile communication system

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Embodiment Construction

[0072] Specific embodiments of the method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0073] In order to solve the problem that the linear range of the frequency offset estimation method in the prior art represented by formula (6) is too small, the accuracy of frequency offset estimation in a large range is poor and the convergence is slow, the method of the present invention adopts an improved frequency offset measurement method. Such as figure 1 As shown, in the phase offset vector diagram of the pilot complex signal I and Q signals received by the mobile station, the [-π, π) phase offset interval is equally divided into 8 sub-intervals on the unit circle, which are respectively: [-π , -3π / 4), [-3π / 4, -π / 2), [-π / 2, -π / 4), [-π / 4, 0), [0, π / 4), [π / 4, π / 2), [π / 2, 3π / 4) and [3π / 4, π), which are sequentially numbered as subintervals 0 to 7. figure 1 In the sub-interval numbered 5, the phase offset vector between t...

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Abstract

This invention refers to a frequency deviation compensation method for separating RAKE receiver, which contains making independent frequency compensation to Doppler shift in each RAKE signal, generating base band feedback control signal according to RAKE shift and making uniform frequency compensation to RF and IF. Said method can quick and accurately estimate the frequency shift of tracked route, speed up AFC convergence rate and greatly raise the tracking range of frequency shift variation.

Description

technical field [0001] The present invention relates to an automatic frequency control (AFC) method of a mobile station rake (Rake) receiver in a direct sequence spread spectrum (DSSS) mobile communication system, and more particularly relates to an internal A method for independent frequency compensation of large-range Doppler frequency shift in each multipath signal. Background technique [0002] Mobile communication systems using direct sequence spread spectrum communication technology usually face the problem of signal multipath propagation. Multipath propagation is caused by the existence of multiple transmission paths for signals between the transmitter and receiver, which negatively affects mobile communication systems using various modulation techniques, such as intersymbol interference (ISI) limitations caused by multipath propagation The maximum information transmission rate of the system. In order to overcome the interference caused by multipath propagation, Rak...

Claims

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Application Information

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IPC IPC(8): H04B1/12H04B1/707
Inventor 姜韬
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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