Mitigation of multipath fading effects and suppression of multiuser interference (MUI) constitute major challenges in the design of wide-band third-generation wireless mobile systems. Space–time (ST) coding offers an effective transmit-antenna diversity technique to combat fading, but most existing ST coding schemes assume flat fading channels that may not be valid for wide-band communications....

Based on the minimum mean squared error (MMSE) between the data stream and the linear combiner output, a new multiuser detection (MUD) algorithm that combines space–time (ST) processing and antenna array on directsequence CDMA signals is proposed. The proposed ST-MUD algorithm is proved to be equivalent to two existing MMSE-based ST-MUD algorithms, and the theoretical BER performances for all t...

In this paper we analysis about MIMO relay systems in the presence of co-channel interference and feedback delay. Now a days, fading is a serious problem to transmit the information from transmitter to the receiver. Due to this Fading, we can’t get the full diversity order. so, that for achieving a Multiuser diversity, we have to analyze the performance of Average SER and outage probability of ...

For practical wireless DS-CDMA systems, channel estimation is imperfect due to noise and interference. In this paper, the impact of channel estimation errors on multiuser detection (MUD) is analyzed under the framework of the replica method. System performance is obtained in the large system limit for optimal MUD, linear MUD and turbo MUD, and is validated by numerical results for finite systems.

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...

One of the major challenges in wireless communication system is increasing complexity and reducing performance in detecting the received digital information in indoor and outdoor Environments. Consequently to overcome this problem we analyze the delay performance of a multiuser with perfect channel state information transmitting data on deep fading environment. In this proposed system, the Wire...

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 ...

A new geometry-based stochastic channel model called multiuser double-directional channel model (MDDCM) for macro cellular environments is introduced in this paper. It combines several ideas of directional channel modeling and includes propagation effects like over rooftop propagation, street canyon effect, Line-of-Sight (LOS) and far clusters. The details of the propagation effects and the cor...