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Multi-user Signal Processing Techniques for DS-CDMA Communication
Systems

Mohit Garg (00D07015)
Guide: Prof. U. B. Desai

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Introduction
Multi-user signal processing techniques can be classified into two broad
categories:
• Multi-user Detection
 Receiver based schemes
 Can be used on the uplink channel
 Maximum Likelihood Multi-user Detector formulated by Verd´u (1986)
• Multi-user Transmission
 Transmitter based schemes so as to reduce complexity at the receiver
 Can be used on the downlink channel
 – Need channel knowledge at the transmitter
• The focus of this work has been towards reducing the computational burden
at the receiver. We have proposed
 + A modification to two existing multi-user detection algorithms
 + Two new multi-user transmission algorithms