Near-far resistant detection of CDMA signals in dispersive channels
Signal Processing
Blind channel estimation and detection for space--time coded CDMA in ISI channels
Digital Signal Processing
Space-time coded MC-CDMA: blind channel estimation, identifiability, and receiver design
EURASIP Journal on Applied Signal Processing
Multiuser channel estimation from higher-order statistical matrix pencil
EURASIP Journal on Applied Signal Processing
IEEE Transactions on Signal Processing
Blind receiver for space-time differentially-encoded CDMA systems on multipath fading channels
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
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Blind channel estimation for periodic sequence DS-CDMA systems can be cast into the framework of “structured” blind estimation of multi-input/multi-output (MIMO) FIR systems, where the structure is imposed by the user's signatures. A possible approach to tackle this problem consists in looking for a structured solution to one of the blind MIMO-FIR systems, proposed previously. This is the approach undertaken by several authors. However, most of them did not address identifiability issues. In this paper, we first recall and reformulate some general MIMO FIR identification results of Meraim, Loubaton and Moulines (see IEEE Trans. Inform. Theory, vol.43, p.499-511, 1997), and point out some difficulties posed by the subspace approach. Next, we use the above material in order to analyze the behavior of the subspace forward link channel estimate of CDMA systems. We derive new results showing that the subspace method is not robust to an over-determination of the channel order greater than the spreading factor. If however the over-determination error is less than the spreading factor, we show that the subspace estimate is consistent if the codes of the users are properly designed