关键词: 增强-多媒体广播/组播业务, 空时编码, 循环延迟分集, 正交频分复用

Abstract:

A transmit diversity strategy in enhanced multimedia broadcast/multicast service (E-MBMS) networks was proposed, in which the space-time-frequency coding technique was adopted, i.e., the frequency diversity and the cyclic delay diversity were jointly designed to enhance the traditional space-time coding scheme. The broadcast/multicast cells in the proposal were divided into multiple cell groups. And the orthogonal frequency division multiplexing (OFDM) symbols in the same cell between different frames were executed with space-time coding schemes, Meanwhile, the proper cyclic delay was obtained to the frequency diversity gain in the different cell groups. Simulation results show that the proposal can improve the bit error rate performances efficiently and get increasing of coverage and throughput, especially for those users who are at the cell edges.

Key words: enhanced multimedia broadcast/multicast service, space-time coding, cyclic delay diversity, orthogonal frequency division multiplexing