提出了一种自适应比特和功率分配的宽带MISO/OFDM传输系统，建立了宽带MISO/OFDM传输系统的模型，并对该系统的最大子载波信噪比性能进行了分析。仿真结果表明：在多径衰落信道下，与没有采用自适应比特和功率分配的传统发射分集OFDM传输系统相比，该系统的误比特性能得到了明显的提高。关 键 词 多输入单输出/正交频分复用; 传输系统; 自适应比特分配; 自适应功率分配Abstract In this paper, we propose a broadband MISO/OFDM transmission system with adaptive bit and power allocation. The model of proposed system is established. The performance of maximal SNR on each sub-carrier of proposed system is analyzed. The simulation results show that the proposed system can achieve better performance compared to that of the conventional adaptive transmit diversity based OFDM systems without adaptive bit and power allocation over multipath fading channels.Key words multiplex input single output/orthogonal frequency division multiplexing; transmission system; adaptive bit allocation; adaptive power allocation