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Muti-path detecting method for CDMA communication system

A communication system and code division multiple access technology, which is applied in the field of using the super-strong path processing method to improve the multipath detection performance and thus the performance of the receiver, can solve the problems of the degradation of the baseband demodulation performance, the degradation of the multipath detection performance, etc. The effect of improving system performance and improving demodulation performance

Inactive Publication Date: 2007-03-28
ZTE CORP
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Problems solved by technology

[0010] The purpose of the present invention is to provide a multipath detection method in a code division multiple access communication system. Degraded detection performance, which leads to a decrease in baseband demodulation performance

Method used

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  • Muti-path detecting method for CDMA communication system
  • Muti-path detecting method for CDMA communication system
  • Muti-path detecting method for CDMA communication system

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Embodiment Construction

[0033] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings. According to the specific implementation methods described below, those skilled in the art can easily implement the present invention.

[0034] The multipath detection method in the code division multiple access communication system of the present invention is a kind of method for identifying superpath and carrying out special processing to superpath, and its basic technical scheme is:

[0035] In the system design stage, determine the relative threshold of the super-strong path, that is, the ratio n of the current energy and the historical energy.

[0036] In the system operation stage, each processing is mainly divided into the following steps:

[0037] The first step is to calculate the absolute threshold of the super-strong path in real time.

[0038] The second step is to read the relative threshold at the time of system design—...

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Abstract

During the system running stage, this method calculates at real time the absolute threshold of the super strong path (SSP), reads the relative threshold of the system design stage, judges the SSP. If the multipath energy is greater than the absolute energy threshold and the ratio of multipath recent energy to historical energy is greater than the ratio threshold n, and if the multipath energy is greater than the energy of the adjacent path by 1 / 2 code bit, then judges it as a SSP and adopts a new SSP filter coefficient to realize the IIR filter against SSP. According to the power delay function after filtering, this method calculates the multipath threshold, makes multipath selection and completes the multipath management post-processing. Comparing with the recent technique, the multipath testing method introduces a SSP multipath test method against the multipath searching progress. The method improves feature of demodulation and the method is proved in practical system testing.

Description

technical field [0001] The present invention relates to a multipath detection method in a Code-Division Multiple Access (CDMA: Code-Division Multiple-Access) communication system, and in particular to a method for improving multipath detection performance by using a super-strong path processing method so as to improve receiver performance. performance method. Background technique [0002] In the prior art, Code Division Multiple Access (CDMA) is a multiple access method, which is based on spread spectrum technology, and has recently become a method applied to communication systems in addition to the existing frequency division multiple access and time division multiple access methods. Yet another multiple access method. Compared with previous technologies, CDMA has many advantages, such as high spectrum utilization rate and good confidentiality. At present, the systems using CDMA methods mainly include: narrowband CDMA system, wideband CDMA system, CDMA2000 system, TD-SCDM...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04J13/02H04B1/7113H04B1/7115
Inventor 李灵向梅万里龙
Owner ZTE CORP
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