中文说明：应用背景最新的和最有前途的球员的PHY层，OFDM已经自研究开始受到重视和采纳。这的确是一个强大的和可靠的物理实现。利用正交频信道提高信道效率。关键技术采用正交频信道，该层可以携带更多的子载波，提高效率。由于相邻信道的正交性，因此干扰是有限的。
English Description：
Application background As the latest and most promising players for PHY layers, OFDM has received much attention and adoption since the research first began. It is indeed a powerful and reliable PHY realisation. It improves the channel efficiency by using orthogonal frequency channels. Key TechnologyBy the adoption of orthogonal frequency channels, the layer can carry more sub-carriers and the efficiency is boosted. And because of the orthogonality of the neighbouring channels, the interference is therefore limited.