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正交频分多址(OFDMA)是以正交频分复用(OFDM)调制为基础的新一代多址技术,具有很高的带宽利用率。首先结合OFDMA在有线电视网络中的应用介绍了它的基本原理,然后简单介绍了它在宽带无线接入IEEE802.16a中的应用,主要是关于子信道划分的问题。
Orthogonal Frequency Division Multiple Access (OFDMA) is a new generation of multiple access technology based on Orthogonal Frequency Division Multiplexing (OFDM) modulation with high bandwidth utilization. First of all, the basic principle of OFDMA in CATV network is introduced. Then its application in broadband wireless access IEEE802.16a is introduced briefly. The problem about sub-channel division is mainly discussed.