Ofdm Technology In Mobile Communications

This paper concentrates on the orthogonal frequency division multiplexing(OFDM) technique and some techniques to resist multipath fading. It also simulates by computer. Based on detailed theoretical analysis and research of the mobile channel, Firstly it introduces the basis principle of OFDM and concisely present some measures to overcome multipath fading, and then discusses several key techniques of OFDM concretely: 1. OFDM combined with channel coding(COFDM) can enhance the ability to lower the effect of multipath fading. 2. A joint frequency and space diversity scheme is presented which can reduce computational cost. 3. An adaptive bit, power and subcarrier allocation is presented. When the channel changes rapidly, this proposed dynamic algorithm is efficient. Other than above, this paper also studies the character of OFDM under multipath fading and gives the baseband computer simulation by Systemview. At last, it performs OFDM DSP hardware plug-in simulation.