標題: Adaptive variable step-size Griffiths' algorithm for blind demodulation of DS/CDMA signals
作者: Hwang, HC
Wei, CH
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: direct-sequence code-division multiple access communications;multiple access interference;blind Griffiths' algorithm;variable step-size
公開日期: 1-十月-1999
摘要: The minimum mean-squared error (MMSE) linear detector [1], [2] has been proposed to successfully suppress the multiple access interference and mitigate the near-far problem in direct-sequence code-division multiple access communication systems. In the presence of unknown or time-varying channel parameters, the MMSE linear detector can be implemented by the blind Griffiths' algorithm [3], which uses the desired signal vector instead of a training sequence of symbols for initial adaptation. In this paper, a variable step-size (VSS) Griffiths' algorithm is proposed for accelerating the convergence speed, especially in the presence of strong interference. Numerical results show that the convergence properties of the VSS Griffiths' algorithm are robust against the wide eigenvalue-spread problem of the correlation matrix associated with the received signal vector compared to the Griffiths' algorithm using a fixed step-size.
URI: http://hdl.handle.net/11536/31039
ISSN: 0916-8516
期刊: IEICE TRANSACTIONS ON COMMUNICATIONS
Volume: E82B
Issue: 10
起始頁: 1643
結束頁: 1650
顯示於類別:期刊論文