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This paper deals with narrowband interference suppression in direct-sequence code-division multiple-access (CDMA) systems. In order to take advantage of the cyclostationary nature of the interfering signal, we propose here to adopt a linear conjugate-linear (LCL) polyperiodically time-varying (PTV) filter in the suppression stage, whose adaptive implementation is based on the RLS algorithm. Unlike...
In this paper we derive and propose constrained blind DS-CDMA UWB multiuser detection algorithm to suppress the multi access interference (MAI) in multipath channels, and studied its bit error probability performance in the presence of narrowband interference. Variance of the receiver output is minimized subject to appropriate constraints. Receiver does not require spreading code knowledge of all...
Narrowband cellular systems require no bandwidth expansion for spectrum sharing. This attractive property is offset by the need to separate cochannel cells in order to reduce mutual interference. The net effect is a larger cluster size and a smaller system capacity than can be obtained by wideband cellular systems that operate with a cluster size of one. We propose to use a joint maximum-likelihood...
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