基于盲源分离的Multi-Rate DS/CDMA信号 扩频序列盲估计

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2012, Vol. 33 ›› Issue (8): 1455-1465.

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Blind Source Separation Based Blind Estimation of the Spreading Sequences for Multi-Rate DS/CDMA Signals

REN Xiaotian, XU Hui, HUANG Zhitao, WANG Fenghua, LU Fengbo

College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073,China

Received:2011-10-14 Revised:2011-11-25 Online:2012-08-25 Published:2012-08-23
Supported by:
National Natural Science Foundation of China (61072120)

Abstract

Abstract: The characteristics of the Multi-Rate DS/CDMA signals are analyzed in this paper, and two dimension-deflation methods with different loop durations are presented in accordance with the signal characteristics in synchronous and asynchronous systems. For the asynchronous system, the received signals are divided into two-spreading-period-length temporal vectors; the Fast-ICA algorithm is used to estimate the spreading sequences blindly with the same spreading period. The estimated spreading sequences are obtained according to the desychronous time, which is calculated based on the 2-norm of vector. The normalization weight function of the estimated waveform similarity ratio is exploited to separate the spreading sequences with different spreading periods. For the synchronous system, the process is the same with the algorithm described above, except that the received signals are divided into one-spreading-period-length temporal vectors. Finally, theory analysis and simulation results demonstrate the validity of the new method.

Key words: variable spreading gain, Multi-Rate DS/CDMA signal, blind estimation of the spreading sequence, blind source separation, non-cooperative communication

CLC Number:

REN Xiaotian, XU Hui, HUANG Zhitao, WANG Fenghua, LU Fengbo. Blind Source Separation Based Blind Estimation of the Spreading Sequences for Multi-Rate DS/CDMA Signals[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, 33(8): 1455-1465.

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Blind Source Separation Based Blind Estimation of the Spreading Sequences for Multi-Rate DS/CDMA Signals

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