Iterative CDMA receiver with EM channel estimation and turbo decoding
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Principles of Spread-Spectrum Communication Systems
Principles of Spread-Spectrum Communication Systems
IEEE Transactions on Signal Processing - Part II
Blind adaptive multiuser detection in multipath CDMA channels basedon subspace tracking
IEEE Transactions on Signal Processing
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IEEE Transactions on Wireless Communications
Totally blind channel estimation for OFDM on fast varying mobile radio channels
IEEE Transactions on Wireless Communications
Simplified eIRA code design and performance analysis for correlated Rayleigh fading channels
IEEE Transactions on Wireless Communications
Robust Iterative Noncoherent Reception of Coded FSK over Block Fading Channels
IEEE Transactions on Wireless Communications
An EM-Based Iterative Receiver for MIMO-OFDM Under Interference-Limited Environments
IEEE Transactions on Wireless Communications
Design of capacity-approaching irregular low-density parity-check codes
IEEE Transactions on Information Theory
Successive interference cancellation with SISO decoding and EM channel estimation
IEEE Journal on Selected Areas in Communications
Iterative demodulation and decoding of turbo-coded M-ary noncoherent orthogonal modulation
IEEE Journal on Selected Areas in Communications
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In this paper, we describe direct-sequence codedivision multiple-access (DS-CDMA) systems with quadriphaseshift keying in which channel estimation, coherent demodulation, and decoding are iteratively performed without the use of any training or pilot symbols. An expectation-maximization channelestimation algorithm for the fading amplitude, phase, and the interference power spectral density (PSD) due to the combined interference and thermal noise is proposed for DS-CDMA systems with irregular repeat-accumulate codes. After initial estimates of the fading amplitude, phase, and interference PSD are obtained from the received symbols, subsequent values of these parameters are iteratively updated by using the soft feedback from the channel decoder. The updated estimates are combined with the received symbols and iteratively passed to the decoder. The elimination of pilot symbols simplifies the system design and allows either an enhanced information throughput, an improved bit error rate, or greater spectral efficiency. The interference-PSD estimation enables DS-CDMA systems to significantly suppress interference.