In cellular mobile radio systems, multiple access is causing interference that limits capacity of the networks. The GSM system with multiple users can be interpreted as MIMO system with a desired user and (cochannel and adjacent channel) interferers. Using a multiple– input multiple–output (MIMO) multiuser joint detection approach for desired signal and one or more (strongest) interferers, netw...

This paper presents the results related to the interference reduction technique in multistage multiuser detector for asynchronous DS-CDMA system. To meet the real-time requirements for asynchronous multiuser detection, a bit streaming, cascade architecture is used. An asynchronous multiuser detection involves block-based computations and matrix inversions. The paper covers iterative-based subop...

The jointly optimum multiuser noncoherent detector for DPSK modulation over the generalized diversity Rayleigh fading (GDRF) channel is derived and analyzed. The GDRF channel includes time/frequency/receiver antenna diversity and allows fading correlations between the various diversity branches of each user. Noncoherent detection here refers to the case where the receiver has neither knowledge ...

The two major factors which contribute to erroneous detection in a DS-CDMA system are the MAI and noise. The former appears due to non-orthogonal spreading codes while the latter is the induced by the channel. Since the traditional detectors give a soft output, the presence of MAI and channel noise make these soft decisions non-linearly separable. This chapter describes the use of Radial Basis ...

In this paper, we investigate the use of layered space-time, also known as Vertical-Bell Laboratories Layered Space-Time (V-BLAST) scheme, for multiuser detection in fading channels. The multiple transmit antennas in V-BLAST are treated as individual mobile station transmitters, while the base station consists of multiple receive antennas. In the proposed system, users are organized in groups a...