IEEE802.16e is one of the Wireless Metropolitan Area Networks (WMAN) standards, and its key physical layer technique is Orthogonal Fequency Division Multiple Access (OFDMA), which is a multi-user version of the popular Orthogonal Frequency Division Multiplexing (OFDM) modulation scheme for multi-user access. OFDMA inherits from OFDM the high spectrum efficiency and good immunity for the
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The wireless communication technique now becomes the emphasis of communication research,and more and more people focus on it.The multicarrier transmission known as OFDM is going to become the most important technique of 4th generation system for its robustness to multipath selective fading and high bandwidth efficiency.Its basic idea is to divide a given channel into
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With the development of mobile communication systems, the demanding for high-speed service is higher and higher, which cause the OFDM technology is widely used. LTE, UWB,Wimax and 4G systems and are all taking OFDM technology as their key technology.Compared with traditional single-user OFDM systems, synchronization technology for OFDMA system are more difficult. First, the received
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