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Multiple access interference is the major limiting factor for the channel capacity especially when it is desired to have an overloaded code division multiple access system, in which the number of users is larger than the dimension of signal space. To resolve the problem of overloading we exploit the multicarrier communication and a proposed scheme, which uses pseudo-user along with parallel interference...
In this paper the computational complexity associated with optimum maximum likelihood detector in wideband code division multiple access systems is addressed. In the proposed scheme, large number of users is divided in groups, each group having a unique orthogonal code and small number of users. Multiuser detection in a particular group is accomplished through particle swarm optimization algorithm,...
Multiple access interference (MAI) is the major limiting factor for the channel capacity especially when it is desired to have large number of users (overloaded) in DS-CDMA system. We propose a scheme which removes MAI with very little computations. The scheme is based on two requirements, firstly, presence of a user called `Pseudo-user' whose data is already known to the receiver and secondly, cross-correlation...
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