Performance analysis of secure DSSS multiuser detection under near-far environment

A cost effective approach for better communication to overcome the near-far problem in CDMA system in case of Direct Sequence Spread Spectrum (DSSS) multiuser system instead of single user is depicted in the paper. The need for improvement of the hearability problem in modern telecommunication system has huge applications in security section. A comparative study of Bit Error Rate (BER) vs Signal to Noise Ratio under near-far environment by Multi User Detection Decorelator (MUD-Decorrelator) & MUD-Decision Feedback method are proposed in this paper. BER of the modulated signal is modified using MUD-Decision Feedback system instead of single user & MUD-Decorelator. The transmitted & received Power Spectral Density (PSD) in both methods declares that qualities of signals remain unchanged. Also the intermediate PSD are plotted here to clarify the security of the signals as well as the systems. Performance analysis of MUD-decision feedback method and MUD-Decorelator method is illustrated in this paper.