衰落信道中OFDM系统子载波自适应MPSK调制  

Adaptive MPSK Sub-Carriers Modulation for OFDM System over Fading Channel

作　　者：何波[1] 李军[2] 林家儒[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876 [2]山东轻工业学院电子信息与控制工程学院,济南250100

出　　处：《北京邮电大学学报》2006年第2期106-109,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60372099);国家"863计划"项目(2001AA123016);教育部博士点基金项目(11111104042)

摘　　要：利用信道瞬时预测及其估计信息,提出一种OFDM(正交频分复用)系统自适应的MPSK(多进制相位调制)子载波调制算法,保持功率和传输速率一定,使误码率最小.仿真表明,此算法与最优比特装载算法相比,性能差别很小,但复杂度比后者低得多;与静态信道分配方案相比,误码率在10-1时自适应分配算法可节省功率约5 dB.An adaptive modulation algorithm, minimizing the average BER（bit error rate）while maintaining constant power and throughput in OFDM（orthogonal frequency division multiplexing）system, exploiting the instant prediction estimation channel states information was proposed. According to the simulated results the proposed algorithm could work successfully as well as the optimal bits loading algorithm, while complexity is much lower than the latter, and it is about 5 dB superior to the fixed bits loading algorithm at 10 1 BER under fading channel.

关 键 词：衰落信道 子载波装载 正交频分复用系统 多载波调制 

分 类 号：TN919.3[电子电信—通信与信息系统]