Communication systems engineering
Communication systems engineering
SAGE algorithms for multipath detection and parameter estimation inasynchronous CDMA systems
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Blind multiuser channel estimation in asynchronous CDMA systems
IEEE Transactions on Signal Processing
Channel estimation for the uplink of a DS-CDMA system
IEEE Transactions on Wireless Communications
A maximum likelihood approach for estimating DS-CDMA multipath fading channels
IEEE Journal on Selected Areas in Communications
Channel acquisition for wideband CDMA signals
IEEE Journal on Selected Areas in Communications
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The problem of estimating the multipath channel parameters of a new user entering the uplink of an asynchronous direct sequence-code division multiple access (DS-CDMA) system is addressed. The problem is described via a least squares (LS) cost function with a rich structure. This cost function, which is nonlinear with respect to the time delays and linear with respect to the gains of the multipath channel, is proved to be approximately decoupled in terms of the path delays. Due to this structure, an iterative procedure of 1D searches is adequate for time delays estimation. The resulting method is computationally efficient, does not require any specific pilot signal, and performs well for a small number of training symbols. Simulation results show that the proposed technique offers a better estimation accuracy compared to existing related methods, and is robust to multiple access interference.