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Method for obtaining partial interference-bucking value in interference-bucking receiver

A technology of interference cancellation and acquisition method, applied in the electronic field, can solve problems such as slow convergence speed, high algorithm complexity, and poor performance

Inactive Publication Date: 2003-03-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, some interference cancellation weights are obtained by selecting a fixed value or by an adaptive method. The method of selecting a fixed value has poor performance when the channel estimation error is large, while the adaptive method has a large algorithm complexity or slow convergence speed. Shortcomings

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  • Method for obtaining partial interference-bucking value in interference-bucking receiver
  • Method for obtaining partial interference-bucking value in interference-bucking receiver
  • Method for obtaining partial interference-bucking value in interference-bucking receiver

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Embodiment Construction

[0033] According to the above function characteristics, several specific expressions of the function f(·) are given below, of course, f(·) can also have other expressions.

[0034] 1. When the function expression is (1), the interference cancellation weight algorithm expression is as follows: suppose the number of users in the system is K, each user has L paths, and the channel estimation of the jth path signal of user i value expressed as Where|A i，j | is the estimated amplitude value,  i，j is the phase value of the channel estimation, since the channel estimation value can also be represented by a complex number, that is, a+bj, where a is the real part of the channel estimation, b is the imaginary part of the channel estimation, then φ i , j = arctg - 1 ( b a ...

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Abstract

In the CDMA communication system of the multiple user detection using the category of elimianting interference, the performance of the CDMA receiver is restricted by the accuracy of regenerating the multiple access interference. The accuracy of regenerating the multiple access interference is affected by the reliability of Rake receiving the adjudication and the accuracy of the channel estimation. Under the condition of the certain reliability and the accuracy, using the functional relations between the amplitude, the phase of the channel estimation and the weight value of the partial interference elimiantion obtains the method to get the said weight value. Thus, the invention improves the performance of the multiple-user detector.

Description

Technical field: [0001] The invention belongs to the field of electronic technology, and especially designs wireless communication technology. Background technique: [0002] Code Division Multiple Access (CDMA) communication system is an interference-limited system, and Multi-Access Interference (MAI) is one of the main interferences in the system. In order to improve system performance and increase system capacity, it is necessary to eliminate MAI Very important. One of the multiple access interference elimination methods: multi-user detection (Multi-User Detection) technology, there are many implementation methods, which can be roughly divided into two types: linear and nonlinear. The performance of interference cancellation (Interference Cancellation) type multi-user detection methods in nonlinear multi-user detector basically depends on the accuracy of reconstructed multiple access interference (MAI). However, it is very difficult to reproduce accurate multiple access ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04B1/7107H04B1/7115
Inventor 唐友喜李少谦胡成华陈继明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA