Performance analysis of the linearly constrained constant modulus algorithm-based multiuser detector

Authors:
J.B. Whitehead;F. Takawira
Affiliations:
Sch. of Electr., Univ. of KwaZulu-Natal, Durban, South Africa;-
Venue:
IEEE Transactions on Signal Processing
Year:
2005

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Abstract

This paper quantifies the adaptive performance of a blind adaptive multiuser detector (MUD) based on the linearly constrained constant modulus algorithm (LCCMA) in both a stationary and nonstationary channel. A framework is developed to apply the feedback analysis method to analyzing adaptive MUD schemes. A closed-form expression for the excess mean square error (EMSE) of LCCMA blind adaptive MUD in a CDMA communications system is derived for both of the steady-state and tracking cases. The effects of additive noise and multiple access interference are considered. A transient analysis is performed that predicts the learning curve of the adaptive filter. Computer simulation is used to verify the accuracy of the analysis.