ANALYSIS OF ROBUST MILTIUSER DETECTION TECHNIQUE FOR COMMUNICATION SYSTEM

Signal Processing and communication

Today, in this information-hungry society, Internet traffic such as multimedia streaming applications is driving the demand for high speed data packet wireless services. Multiple access interference (MAI) limits the capacity of Direct Sequence Code Division Multiple Access (DS-CDMA) systems. Multiuser detection is an approach which uses filters for the optimization. However, the main drawback of the optimal multiuser detection is one of complexity so that suboptimal approaches are being sought. Much of the present research is aimed at finding an appropriate trade off between complexity and performance. These suboptimal techniques have linear and non-linear algorithms. The use of multiple transmit and receive antennas has been proposed for the fourth generation code-division multiple access (CDMA) wireless cellular networks in order to meet these demands. Receivers proposed for such systems thus far have been based on the assumption that perfect knowledge of the channel state information is available. Multiuser detection is an approach which uses filters for the optimization. In this work, the non-linear approach for multi user detection is applied. The grouping based on signal strength is applied on successive interference cancellation scheme. The BER is improved compared to SIC scheme.

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