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Double-weighing parallel interference-counteracting algorithm

A technology of interference cancellation and interference pairing, applied in the field of multi-user detection

Inactive Publication Date: 2003-03-19
HUAWEI TECH CO LTD
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Problems solved by technology

At present, there are only qualitative conclusions about the selection of weights: with the increase of the PIC algorithm series, the weight p (k) increase

Method used

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0067] The multi-level structure of the double-layer weighted PIC algorithm is the same as the traditional PIC algorithm, such as figure 1 shown. The PIC structure of the algorithm is the same as the weighted PIC algorithm based on Bayesian criterion, such as Figure 4 shown. The last level PIC structure of the algorithm is the same as the traditional PIC algorithm, such as image 3 shown.

[0068] like figure 1 As shown, the baseband signal r(t) of the received signal enters the first-stage PIC structure 1 in the figure in parallel. like Figure 4 As shown, the input signals entering the PIC structure in parallel enter the RAKE receiver 3 of each user respectively. The RAKE receiver 3 first despreads the input signal, then performs channel estimation based on the despreading result, and finally performs multipath combination, and sends...

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Abstract

The present invention provides a cancellation algorithm of bilayer weighted parallel interference based on the studing of cancellation algorithm of partial parallel interference and based on the weighted parallel interference cancellation algorithm of the Bayes theorem. The algorithm not only has the advantage of weighted algorithm based on the Bayes, theorem which can achieve the minimum cost in bit grade judgement, but also can make up the deviation to the client signal estimation on the statistic means at the advantage possessing in partial weighted algorithm. At the same time, comparing with the cancellation algorithm of weighted parallel interference based on the Bayes theorem, the algorithm has increased the gain a lot at the low signal to noise ratio without mush increasing amount of calculations.

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. technical background [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 multiple access interference caused by one user to other users is usually very small. But when the number of users increases, for a certain user, the sum of the multiple access interference generated by other users is very large. When the near-far effect exists, the signal amplitude of a certain user is relatively large, and the multiple access interference generated by this user to the weak ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/66H04B1/707
Inventor 魏立梅王国林
Owner HUAWEI TECH CO LTD
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