正交頻分復用技術（Orthogonal Frequency Division Multiplexing， OFDM）非常適合高速通信系統，但存在高峰均功率比（PAPR）的問題。對OFDM系統中如何降低PARR的問題進行了研究，討論了降低PAPR的主要方法，重點分析了選擇性映射法（SLM），并在此基礎上提出了一種基于預編碼矩陣的改進算法，最后通過matlab進行了算法仿真，仿真結果表明，改進算法在使得OFDM系統在降低峰均功率比的性能上得到了進一步的改善。
Abstract: While many questions still surround the creation and deployment of the smart grid, the need for a reliablecommunications infrastructure is indisputable. Developers of the IEEE 1901.2 standard identified difficult channel conditionscharacteristic of low-frequency powerline communications and implemented an orthogonal frequency division multiplexing (OFDM)architecture using advanced modulation and channel-coding techniques. This strategy helped to ensure a robust communicationsnetwork for the smart grid.
