多用户OFDM自适应组合调制及比特分配算法的实现  

Algorithm Implementation of Self-Adaptive Combined Modulation and Bit Allocation in Multi-user OFDM System

作　　者：李精华[1] 侯春萍[1] 孙山林[1] 

机构地区：[1]天津大学电子信息工程学院

出　　处：《桂林电子工业学院学报》2006年第1期20-23,共4页Journal of Guilin Institute of Electronic Technology

基　　金：国家自然科学基金项目(60172068)

摘　　要：将自适应技术应用于多用户正交频分复用系统,能够提高频谱利用率,降低系统发射功率,从而使系统的整体性能达到最优;针对多用户OFDM系统,将其信道分配和比特分配相结合,提出了更优的多用户OFDM自适应组合调制比特分配算法(M CABA)。根据信道特性的瞬时估计值,自适应地为各用户分配子信道和比特,在给定误码率的条件下使总的发送功率最小,仿真结果表明,该算法计算简单,优化效率高,可以达到接近理论上的最优水平。The application of adaptive technology to the multi-user OFDM system can increase the spectrum usage, reduce the transmission power of the system and optimize the system performance. In this paper we propose a novel multi-user combined-modulation algorithm of adaptive OFDM, which combines the wireless channel and bit allocations. According to the estimation of instantaneous channel characteristics, the adaptive allocation algorithm can assign the sub-channels and bits for each user in the system to minimize the total transmission power with a given bit error rate. Simulated results show that the proposed algorithm is as simple in calculation, high in efficiency and optimal in theory as the optimal scheme.

关 键 词：多用户 正交频分复用 自适应组合调制 比特分配 

分 类 号：TN929[电子电信—通信与信息系统]