A variable step-size EASI algorithm based on PI for DS-CDMA system blind estimation

To solve the problem of the direct sequence code division multiple access (DS-CDMA) system multiuser detection, this paper proposes a variable step-size based on performance index (PI) EASI algorithm for information code and chip sequence blind estimation. Contrasting blind source separation (BSS) a...

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Bibliographic Details
Main Authors: Li Gao, Tianqi Zhang, Danna He, Sheng Zhou
Format: Conference Proceeding
Language:English
Subjects:
Algorithm design and analysis
Bit error rate
Blind source separation
chip sequence estimation
direct sequence code division multiple access (DSCDMA)
EASI algorithm
Estimation
Multiaccess communication
Multiuser detection
PI variable step-size
Signal processing algorithms
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Summary:To solve the problem of the direct sequence code division multiple access (DS-CDMA) system multiuser detection, this paper proposes a variable step-size based on performance index (PI) EASI algorithm for information code and chip sequence blind estimation. Contrasting blind source separation (BSS) and DS-CDMA system model, the algorithm uses adaptive method to estimate the mixing matrix for estimating the chip sequence, and uses the demixing matrix to separate the observation signal for estimating the information code. In addition, the algorithm uses evaluation performance index (PI) to adjust the step-size, this makes the convergence speed and stability of the algorithm reach an ideal balance. The experimental results show that the algorithm has good resistance to multi-access interference (MAI). The bit error rate (BER) of information code is below 10 -2 in 0 dB.
DOI:10.1109/CISP.2012.6469693