Performance Analysis and Comparison of Full Chip and Half Chip Rate DC and NC Code Acquisition in MIMO DSCDMA over Uncorrelated Rayleigh Wireless Channel

N Sathish Kumar,K R Shankar Kumar

doi:10.5402/2011/976759

Abstract

This paper presents the performance analysis and comparison of full chip and half chip rate of noncoherent (NC) and differentially coherent (DC) code acquisition scheme in (multiple input-multiple output) MIMO assisted by direct sequence spread spectrum (DS-CDMA) wireless system when communicated over uncorrelated Rayleigh channel. Four schemes are investigated, namely, SISO with full chip rate, SISO with Half chip rate, MIMO with full chip rate, and MIMO with half chip rate by varying the code acquisition technique. The simulation is done in RF signal processing Lab using matlab tool box, and the performance metrics are considered, namely, Bit Error Rate (BER) and mean acquisition time (MAT). The simulation results indicate that DC performance is superior than NC in both full chip and half chip rate and also shown that half chip performance is better than full chip in both DC and NC code acquisition methods.

Highlights

MIMO technique is employed with spread spectrum to increase capacity and improve the overall performance in the MIMO scheme
It is evident that differentially coherent (DC) code acquisition system performs better in terms of Bit Error Rate (BER) characteristics when compared to NC systems
It is evident that MIMO technique is employed with spread spectrum to increase capacity and improves performance in the MIMO scheme

Summary

Introduction

MIMO technique is employed with spread spectrum to increase capacity and improve the overall performance in the MIMO scheme In these systems, multiple antennas are used at both ends of the wireless link. It has the ability to combat the fading phenomena in wireless links Recent research in this method has shown an increase in system diversity and bandwidth efficiency [1]. This technique offers higher capacity to wireless systems, and the capacity increases linearly with the number of antennas. V is assumed as a complex Gaussian random vector with elements vi ∼ CN (0, N0), and H and V are independent of each other and of the data vector a

DS-CDMA Modulation

System Model

Simulation Results and Discussions

Conclusion