改进的动态子带划分的LPLC-OFDM自适应调制算法

An improved dynamic subband division adaptive modulation algorithm of LPLC-OFDM

针对低压电力线载波通信信道的频率选择性衰弱,提出一种改进的子带动态划分OFDM自适应调制算法。算法根据信道状态信息误差准则实现动态的子带划分,采用随机选取方案和非连续子带划分方式能自适应地为各子带中的所有子载波选择相同的调制方式。仿真结果表明,在保证传输质量的前提下,该算法复杂度低,能有效减少信令信息的传递,提高系统的频谱利用率。

To adapt to frequency selective fading of Low-voltage power line,an improved adaptive OFDM algorithm based on dynamic partitioning sub-bands is proposed. The algorithm realizes the dynamic sub division quickly according to channel state information error criterion,random selection scheme and discontinuous subband division ways and selects the same modulation for all subcarriers in each sub-band adaptively. Simulation results show that,under the premise of ensuring the transmission quality,low complexity of the algorithm can effectively reduce the transmission of signaling information to improve spectrum utilization of the system.