【摘要】 本文针对多用户OFDM系统,将其信道分配和比特分配相结合,提出了更优的OFDM多用户组合调制自适应分配算法(M CABA)。该算法在系统总的传输速率一定和满足传输质量的基础上,与现有的OFDM自适应算法相比,可以获得更优的功率、信噪比性能和频率效应。并对该算法进行了理论分析和M atlab6.5.1系统仿真。更多还原

【Abstract】 Contraposition multi-user of OFDM system,combining the wireless channel and bit allocations,this paper proposes a novel multi-user combined-modulation algorithm of adaptive OFDM,which can remarkably reduce the total power needed by the system and improve the adaptive efficiency of fequency resource with the assurance of transmission Qos.Simulated in the adaptive OFDM system with Matlab6.5.1,the performance of the algorithm is compared with present and traditional algorithms,and the results verify the distinct improvements of perfomances both in power and SNR as well.更多还原