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Blind adaptive code-constrained constant modulus algorithms for CDMA interference suppression in multipath channels

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2 Author(s)
de Lamare, R.C. ; PUC-RIO, Rio de Janeiro, Brazil ; Sampaio-Neto, R.

A code-constrained constant modulus (CCM) design criterion for linear receivers is investigated for direct sequence code division multiple access (DS-CDMA) in multipath channels based on constrained optimization techniques. A computationally efficient recursive least squares (RLS) type algorithm for jointly estimating the parameters of the channel and the receiver is developed in order to suppress multiaccess (MAI) and inter-symbol interference (ISI). An analysis of the method examines its convergence properties and simulations under nonstationary environments show that the novel algorithms outperform existent techniques.

Published in:

Communications Letters, IEEE  (Volume:9 ,  Issue: 4 )

Date of Publication:

April 2005

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