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Simplified algorithm of double layer weighted parallel interference cancellation algorithm

A technology that simplifies algorithms and algorithms. It is applied in the field of multi-user detection and can solve problems such as large amount of calculation and unrealizable calculation.

Inactive Publication Date: 2003-04-16
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0034] 1 P in formula (6) (k)  i (k) It is a chip-level multiplication with a large amount of calculation;
[0035] 2 Formula (3) involves hyperbolic tangent operation, which cannot be realized

Method used

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  • Simplified algorithm of double layer weighted parallel interference cancellation algorithm
  • Simplified algorithm of double layer weighted parallel interference cancellation algorithm
  • Simplified algorithm of double layer weighted parallel interference cancellation algorithm

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Embodiment Construction

[0082] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0083] Simplify the multilevel structure of the algorithm as figure 1 As shown, the PIC structure of the simplified algorithm is as Figure 4 As shown, the last stage PIC structure of the simplified algorithm is as image 3 shown.

[0084] An embodiment of the invention is:

[0085] Such as figure 1 As shown, the baseband signal r(t) of the received signal enters in parallel figure 1 The first level of PIC structure in 1. Such as Figure 4 As shown, the input signal r(t) entering the PIC structure in parallel enters the RAKE receiver 3 of each user respectively. The RAKE receiver 3 despreads the input signal first, then performs channel estimation, and finally performs multipath combination. The RAKE receiver 3 sends the multipath combination result to the soft decision unit 8 , and sends the channel estimation result to the s...

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Abstract

This invention puts forward a simplified algorithm of two-layer weighted parallel interference cancellation algorithm which greatly reduces operation volume which keeping its performance. Since it relates to hyperbolic tangent operation in the two layer weighted parallel interference cancellation algorithm it nearly can't by realized. This invented simplified algorithm is to use sectional linear judgement method or looking-up table method to replace the hyperbolic tangent judgement. The substance is to use sectional linear judgement function L(x) or judgement function T(x) of looking-up tableto approach the hyperbolic tangent function tanb(x).

Description

technical field [0001] The invention relates to a multi-user detection technology of a base station in a CDMA mobile communication system, in particular to a parallel interference cancellation algorithm in the CDMA system. Background technique [0002] The CDMA system has become the development direction of the third generation mobile communication because of its advantages of high capacity, high service quality and good security. Multiple access interference (Multiple Access Interference) limits the improvement of CDMA system capacity and performance. The single-user receiver cannot eliminate the impact of multiple access interference on user signal detection, and the detection performance of the receiver decreases when the number of users increases and the near-far effect occurs. Designing a receiver against multiple access interference is the key to give full play to the advantages of high capacity and high quality of service of CDMA system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
CPCH04B2001/71077H04B1/71075
Inventor 魏立梅
Owner HUAWEI TECH CO LTD
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