MIMO M-ary code-selected DS-BPSK communication system

In this paper, based on the Alamouti space time block coding scheme, we propose two transmit diversity scheme of an M-ary code selected direct sequence binary phase shift keying modulation (MCSDS-BPSK) system. The performance of the MIMO M-ary DS-BPSK system is evaluated over flat Rayleigh fading channel. Different with the traditional one branch M-ary modulation scheme such as M-ary PSK, M-ary PAM, and M-ary PPM etc, the proposed system realizes the M-ary modulation through two-branch scheme. It can achieve high bit rate with acceptable system complexity while requires no increase in bandwidth. The system performance is obtained through Monte-Carlo simulation and the processing algorithm is given.