This paper is concerned with the problem of channel estimation for asynchronous DS-CDMA systems in the presence of local scattering of the multipaths. Based on a first order Taylor series expansion, the manifold vector associated with a locally scattered multipath is formulated and a new channel estimation algorithm is proposed. The proposed algorithm hinges on the patioemporal ray (STAR) manif...

An Environmental Adaption Method (EAM) has been recently proposed in which, each solution updates its structure on the basis of current environmental fitness and its own fitness. EAM uses a new operator known as adaption operator. In this paper, an improved EAM, henceforth called as IEAM has been proposed and proper tuning of parameters of algorithm has been done to find the optimal solution in...

It is essential to estimate the Channel and detect symbol in multiple-input and multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) systems. Symbol detection by applying the maximum likelihood (ML) detector gives excellent performance but in systems with higher number of antennas and greater constellation size, the computational complexity of this algorithm becomes quite hi...