Performance Evaluation of ½ Rate Convolution Coding with Different Modulation Techniques for DS-CDMA System over Rician Channel

Abstract

In this paper we evaluate the performance of ½ rate convolution coding with different modulation techniques such as Binary phase shift keying (BPSK), Quadrature phase shift keying (QPSK) and Quadrature amplitude modulation (QAM-16) for direct sequence code division multiple access(DS-CDMA) system using maximal ratio combining (MRC) and equal gain combining (EGC) diversity techniques over Rician fading channel. The performance of ½ rate convolution coding with different modulation techniques are analyzed in terms of Bit error rate (BER) and Signal to noise ratio (SNR). Based on simulation results we have concluded that we obtain better gain in SNR performance when ½ rate convolution coding is used with different modulation techniques.

Performance Evaluation of Channel Codes for High Data Rate Mobile Wireless System

“…By relaxing these amplitude constraints when both amplitude as well as phase is empowered to vary, a new modulation scheme called Quadrature Amplitude Modulation (QAM) originates. [12] Various QAM classifications are there. Sixteen-state Quadrature Amplitude Modulation (16QAM), integrating four I values and four Q values.…”