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Soft Bayesian recursive interference cancellation and turbo decoding for TDD-CDMA receivers

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2 Author(s)
Cusani, R. ; Dept. of INFO-COM, Rome Univ., Italy ; Crea, D.

A novel receiver is proposed for CDMA links with recursive turbo coding, based on a soft-input soft-output multistage interference canceler (IC) and an iterative turbo decoder (TD). After performing IC and TD a first time, the coder state estimates available from the two soft-output Viterbi algorithms in the last TD iteration are exploited to calculate the data bits and the redundancy bits. These are employed for preliminary hard cancellation in the first iteration of a supplementary IC run, and then the TD is run again. An alternative solution with soft feedback is obtained by approximating the reliabilities of the redundancy bits with those of the coder state estimates, and using them for preliminary soft cancellation. Simulation results show the effectiveness of the proposed solutions

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:19 ,  Issue: 9 )

Date of Publication:

Sep 2001

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