Performance evaluation of two transmit diversity techniques for cdma2000

This paper compares the performance of two transmit diversity schemes, orthogonal transmit diversity (OTD) and phase sweeping transmit diversity (PSTD), when utilized by the cdma2000 forward link. Each scheme is simulated for one- and two-path Rayleigh fading channels, and for a one-path Rician fading channel with different k-factors. For configurations employing a coding rate of ½, it is shown that PSTD can significantly outperform OTD when the fading is Rayleigh distributed. For configurations using a coding rate of 1/3, the two methods provide similar performance under Rayleigh fading conditions. Under Rician fading conditions, OTD provides gain over PSTD for both code rates. The gain increases for higher k-factors