【摘要】 提出了一种新的用于正交频分复用(OFDM)系统的自适应调制算法,它在保持恒吞吐量的前提下对OFDM系统进行自适应比特分配和自适应功率分配.与使用固定调制方法的OFDM系统相比,使用该算法系统的误码率性能和吞吐量有了很大的提高.该算法计算量较小,是一种实用的自适应调制算法.模拟结果表明引入子载波分组后系统性能依然保持良好,并且信道估计偏差对本算法的影响较小.更多还原

【Abstract】 A new adaptive modulation algorithm for OFDM system id proposed. The algorithm adopts adaptive bit loading and power allocation while maintaining constant throughput.Compared with fixed modulation scheme,this algorithm can greatly improve the Bit Error Rate performance and system throughput. This is a realizable algorithm because of its small computational complexity. Simulation results show that subcarrier grouping just has a little influence on system performance. Meanwhile the imperfect channel estimation has little effects on the present algorithm.更多还原