Low-complexity variable forgetting factor mechanism for blind adaptive constrained constant modulus algorithms

In this work, we propose a low-complexity variable forgetting factor (VFF) mechanism for blind adaptive constrained constant modulus (CCM) recursive least square (RLS) algorithms applied to linear interference suppression in direct-sequence code division multiple access (DS-CDMA) systems. The propos...

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Vydané v:2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) s. 3293 - 3296
Hlavní autori: Yunlong Cai, de Lamare, R. C., Minjian Zhao, Jie Zhong
Médium: Konferenčný príspevok..
Jazyk:English
Vydavateľské údaje: IEEE 01.03.2012
Predmet:
adaptive filtering
Algorithm design and analysis
Blind multiuser detection
Convergence
Interference
Multiaccess communication
Receivers
Steady-state
variable forgetting factor mechanisms
Vectors
ISBN:1467300454, 9781467300452
ISSN:1520-6149
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Shrnutí:In this work, we propose a low-complexity variable forgetting factor (VFF) mechanism for blind adaptive constrained constant modulus (CCM) recursive least square (RLS) algorithms applied to linear interference suppression in direct-sequence code division multiple access (DS-CDMA) systems. The proposed VFF mechanism employs an updated component relating to the time average of the constant modulus (CM) cost function to automatically adjust the forgetting factor in order to ensure good tracking of the interference and the channel. Analytical expressions for predicting the mean-squared error of the proposed adaptation technique are obtained. Simulation results show that the proposed VFF mechanism achieves superior performance to existing methods at a reduced complexity.
ISBN:1467300454
9781467300452
ISSN:1520-6149
DOI:10.1109/ICASSP.2012.6288619