一种新的自适应OFDM算法的探讨

Discussion on A New Algorithm of Adaptive OFDM

在具有多径干扰的无线信道中仅应用传统OFDM既影响通信速率,也浪费资源。由于信道的频率选择性衰落,OFDM系统的每个子信道具有不同的传输能力。文中提出一种计算量较小、简单实用的自适应OFDM算法,在保证通信质量所需BER的前提下,按照各个子信道衰落程度动态的分配比特和功率,使所需要的发射总功率最小。仿真结果表明,采用该自适应OFDM算法可以提高OFDM系统的性能。

If traditional OFDM is applied in multipath interference channel, it would reduce the communication rate and waste frequency resources. The frequency-selective fading makes each channel of OFDM system have different transmission ability. In ensuring the BER for communication quality, a kind of new adaptive OFDM algorithm is designed, which can change the assignment of bit and power dynamically according to the channel, and is small in calculating amount and more practical. Simulation results show that the adaptive OFDM algorithm could improve the performance of OFDM system.