Performance analysis and comparison of trellis coded STTD and TSTD schemes for CDMA system

The aim of this paper is to analyze and compare the performance of trellis coded Space Time Transmit Diversity (STTD) scheme and trellis coded Time Switched Transmit Diversity (TSTD) scheme for CDMA system. In the first part of the paper we will derive an upper bound for the Frame Error Rate (FER) of both the schemes. We then use the expressions for the upper bound to present the design of trellis codes that are optimum in terms of FER. In the second part of the paper we provide numerical results that validate the design. We conclude with a comparison of both schemes under different channel conditions and multi-user interference.