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Particle filtering method for asynchronous DS-CDMA blind multi-user detection

A DS-CDMA, blind multi-user technology, applied in radio transmission systems, electrical components, transmission systems, etc., can solve the problem that the computational complexity depends on the number of users

Inactive Publication Date: 2008-07-16
SHANGHAI NORMAL UNIVERSITY
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Problems solved by technology

These two types of methods only consider the channel gain estimation and symbol detection of synchronous DS-CDMA, and there is a big gap with the actual application of different user spread spectrum signals randomly arriving at the base station. Separate from symbol detection, its computational complexity depends on the number of users

Method used

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  • Particle filtering method for asynchronous DS-CDMA blind multi-user detection
  • Particle filtering method for asynchronous DS-CDMA blind multi-user detection
  • Particle filtering method for asynchronous DS-CDMA blind multi-user detection

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Embodiment 1

[0036] This embodiment is based on a wireless cellular system with code division multiple access. Assuming that the maximum number of mobile users in a cell is 31, the spreading code used is m-sequence pseudo-random code, the number of series is 5, and the feedback coefficient is M 0 m 1 m 2 m 3 m 4 m 5 =(100101) B , the generated m-sequence is 0000100101100111110001101110 101, and the spreading code used by each user is the sequence obtained by offsetting the sequence by 0 to 30 codewords. For example, the spreading code of user 1 is the sequence, and the spreading code of user 2 is The frequency code is offset by 1 bit, which is 0001001011001111100011011101010, and so on. The spreading code of user 31 is offset by 30 bits, which is 1000010010110011111000110111010. The period of the user baseband symbol adopted is 31 times of the period of the spreading code. The radio frequency modulation method of each user adopts BPSK modulation method. It is also assumed that the ...

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Abstract

The invention relates to a particle filtering method used for asynchronous DS-CDMA system blind multiuser detection in the mobile communication technical field to inhibit multiple access interference and near-far effect and reduce system error rate. The method adopts the following main steps: firstly, a plurality of channel gains, time delays and random particles of a user symbol are generated, and the importance weighing of the random particles is initialized; secondly, a Markov Model, which is set up according to the characteristics of the physical channel of each user, combines with user symbol particle to complete Kalman filtering estimation of each channel gain and time-delayed particle, thereby reducing the deviation of particle distribution; thirdly, the joint posterior probabilityof the particle is obtained and the weighted mean of the particle in the estimated value of the user symbol, channel time delay and gain is completed; fourthly, during the process, update and normalization of particle weighting are completed, and importance resampling of the particle is carried out according to effective sampling size. The invention has the characteristics of stable performance and easy implementation.

Description

technical field [0001] The invention relates to a signal detection and interference suppression method in the field of mobile communication, in particular to a particle filter method for asynchronous DS-CDMA blind multi-user detection, which is used in the mobile communication technology of code division multiple access. Background technique [0002] Direct Sequence Spread Spectrum Code Division Multiple Access (DS-CDMA) wireless communication system uses spread spectrum technology to improve the anti-interference performance of the system. It is modulated with a spread spectrum code at the sending end, so that the frequency bandwidth occupied by the signal is much larger than the necessary bandwidth of the transmitted information, and the same spread spectrum code is used at the receiving end to perform correlation despreading to recover the transmitted information data. Since the pseudo-random spreading codes of each user are not strictly orthogonal, when the base station ...

Claims

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Application Information

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IPC IPC(8): H04B1/69H04B7/216H04B1/7103
Inventor 张静
Owner SHANGHAI NORMAL UNIVERSITY
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