Method for testing DS-CDMA system multi-user developed based on weighting

A DS-CDMA, multi-user detection technology, applied in the field of code division multiple access system multi-user detection, can solve the problems of high implementation complexity, poor algorithm convergence performance, low time complexity, etc.

Inactive Publication Date: 2006-04-19
TSINGHUA UNIV
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Problems solved by technology

According to our research, Lei's method has the following major disadvantages in multi-path large-capacity systems: due to the slow convergence speed of Taylor expansion, the algorithm convergence performance is poor, especially when the system capacity is large and the number of users is large. The algorithm requires a large number of iterations to achieve better performance, resulting in problems such as high implementation complexity and poor real-time performance
[0004] In order to solve the major difficulties in the application of existing methods in broadband and large-capacity wireless communication systems, the present invention proposes a new multi-user detector based on weighted multinomial expansion, which can maintain relatively Under the premise of low time complexity and space complexity, it is very efficient to approximate the linear multi-user detector, so as to effectively overcome many shortcomings of existing related methods

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  • Method for testing DS-CDMA system multi-user developed based on weighting
  • Method for testing DS-CDMA system multi-user developed based on weighting
  • Method for testing DS-CDMA system multi-user developed based on weighting

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Embodiment Construction

[0056] For the meanings of the letters involved in the following formulas, please refer to the introduction to the principle of the invention above. The specific implementation manner of the present invention can be divided into the following steps:

[0057] 1. Determine the number of expansion items N according to the detection accuracy required by the actual system, and perform channel estimation and estimation of the system additive white noise energy. At the same time, the baseband equivalent signal y of different users is generated through down-conversion, filtering, sampling and other circuits.

[0058] 2. Using the method mentioned above, use formula (3) (4) to construct matrix A, B, y MF . Furthermore, the expanded polynomial base matrix G and the intermediate variable α, which are specially designed to speed up the convergence required by the present invention, are calculated according to formula (8).

[0059] 3. Calculate the weighting coefficient after each iterat...

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Abstract

This invention relates to multi-user test method for CDMA system under radio communication multiple channels characterizing in taking the minimum spectral radius as the target to get multinomial expanded basic matrix by optimization design, designing weight series eo, e1...eN to weigh and sum the intermediate signal vectors generated by the multi-stage iteration so as to get the excellent final result output by the multi-user joint detection.

Description

technical field [0001] The invention relates to a code division multiple access system (CDMA) multi-user detection method under a wireless communication multi-path channel. In particular, the present invention relates to reducing the interference caused by multiple access and multipath time delay in a multipath channel code division multiple access system and improving the system performance under the premise of maintaining low implementation complexity in a broadband large-capacity wireless communication system. approach to capacity and performance. Background technique [0002] The performance of CDMA system is mainly limited by interference, which is caused by the signals of other users in the system. The reason is that the spreading codes of users in CDMA system are not orthogonal or the user The signal waveforms are not orthogonal to each other. An example of the non-orthogonality of the spreading code is the spreading method of the Walsh transform scrambling code use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/02
Inventor 赵明张劲帆周世东张秀军周春晖王京
Owner TSINGHUA UNIV
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