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| Adaptive Modulation in FDD Communications over a Fading Channel |
| Fang Xin;Xu Xiao-dong;Gao Xi-ji;You Xiao-hu |
| National Mobile Communications Research Laboratory,Southeast University, Nanjing 210096, China |
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Abstract In this paper adaptive modulation in Frequency Division Duplexing(FDD)communications over a fading channel is studied and packet structure and structure of adaptive modulation are proposed. Further, influence of multiplication of Doppler frequency and packet length is analyzed. Iterative modulation scheme is proposed which adjusts modulation scheme according to different multiplication. Simulation results show that in different multiplication region, different mode can get maximum spectrum efficiency and spectrum efficiency decreases with the increase of multiplication.
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Received: 11 March 2004
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2005, Vol. 27 
