Title :
New approximate QR-LS algorithms for minimum output energy (MOE) receivers in DS-CDMA communication systems
Author :
Cheng, H. ; Zhou, Y. ; Chan, S.C.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
Abstract :
This paper proposes a new family of approximate QR-based least-squares (LS) adaptive algorithms called p-A-QR-LS for blind minimum output energy (MOE) detection in CDMA communications systems. It extends the A-QR-LS algorithm by retaining different numbers of diagonal plus p - 1 off-diagonals of the triangular factor of the augmented data matrix. For p = 1 and N (N is the length of the weighting vector), it reduces to the A-QR-LS and the QR-RLS algorithms, respectively. It not only provides a link between the QR-LMS-type and the QR-RLS algorithms through a well-structured family of algorithms, but also offers more freedom in the complexity-performance tradeoffs for practical receiver design in communication systems. The performance of the proposed algorithm is verified by computer simulations.
Keywords :
adaptive signal processing; code division multiple access; least squares approximations; spread spectrum communication; DS-CDMA communication systems; MOE receivers; approximate QR-LS algorithms; augmented data matrix; blind minimum output energy; complexity-performance tradeoffs; least-squares adaptive algorithms; p-A-QR-LS; Adaptive algorithm; Adaptive filters; Detectors; Filtering algorithms; Least squares approximation; Matrix decomposition; Multiaccess communication; Multiple access interference; Power engineering and energy; Resonance light scattering;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465166
