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Multi-path judging method for time-division duplex mobile communication system

A mobile communication system, time division duplex technology, applied in the direction of transmission system, baseband system components, electrical components, etc., can solve the problems of loss, performance cannot be achieved at the same time, multipath signal full window false system performance, etc. Performance loss, the effect of solving demodulation performance loss

Active Publication Date: 2007-03-07
ZTE CORP
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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-path judgment method for a time-division duplex mobile communication system, which can dynamically change the SNR threshold size according to the size of the input signal, so as to solve the problem of signals with different sizes in the existing fixed-threshold multi-path judgment scheme. The performance can not achieve the best defect at the same time, especially to solve the system performance loss caused by the multi-path signal window full window artifact in the uplink synchronous tracking process when the signal-to-noise ratio is high

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  • Multi-path judging method for time-division duplex mobile communication system
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  • Multi-path judging method for time-division duplex mobile communication system

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Embodiment Construction

[0033] Various preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] The multipath judgment method of the time division duplex mobile communication system of the present invention, it specifically comprises the following steps:

[0035] 9) First, carry out channel estimation according to the training sequence of received data such as midamble code I / Q data and local training sequence such as midamble code, and obtain the original estimated value h=[h of the channel impulse response 0 , h 1 ,...,h P-1 ], P is the basic midamble length;

[0036] 10) Find the energy value Q=|h| of each tap of the original impulse response 2 =[|h 0 | 2 ,|h 1 | 2 ,...,|h P-1 | 2 ];

[0037] 11) In the initial stage, the noise energy is calculated according to the original estimate of the unused midamble offset or calculated by other methods, and the noise energy is recursively averaged on several subframes to...

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Abstract

This invention discloses one time double mobile communication system multi-path judge method, which comprises the following steps: processing signal estimation according to data train sequence I / Q data and local training sequence estimation to get impact responding original values; computing original impact responding each head energy value; computing even noise energy; researching maximum energy head in energy window according to maximum head to compute second gate; getting final multi-path judge gate according to relationship between second gate and fix gate; processing multi-path draw head for judging to output impact responding.

Description

technical field [0001] The present invention relates to a multipath judgment method in a time division duplex mobile communication system, in particular to a multipath judgment method suitable for uplink synchronous tracking at the base station side of a TD-SCDMA time division duplex synchronous code division multiple access mobile communication system . Background technique [0002] In a mobile communication system, the signal received by the receiving end is often the superposition of multiple samples with different time delays obtained by multiple reflections and refractions of surrounding objects. Due to the relative movement between the mobile station and the base station or the movement of surrounding objects, The mobile channel usually exhibits fading characteristics, which affects the performance of the receiver. In order to improve receiver performance and rationally apply multipath signals, technologies such as coherent Rake receiver and joint detection receiver a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B1/69H04B1/711
Inventor 康凤岐秦洪峰曾国燕
Owner ZTE CORP
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