子载波间隔自适应OFDM系统研究

doi:10.3969/j.issn.1000-0801.2009.08.012

Abstract

Abstract:

The development of wireless communications technology OFDM demands higher and higher spectrum efficiency. The spacing of sub-carrier bandwidth is key factors that infect the spectrum efficiency.This paper deducted the OFDM capacity in the time-varying spectrum selective channe1，analyzed the influence of sub-carrier spacing to spectrum efficiency，and proposed the method of adaptive sub-carrier spacing to maximum spectrum efficiency. Simulation proved that adaptive technology can prompt spectrum efficiency greatly.

Key words: OFDM, spectrum efficiency, sub-carrier spacing, adaptive

Guoqing Jia,Yong Xiong,Xiumei Yang. Research on Spectrum Efficiency Maximizing of OFDM System[J]. Telecommunications Science, 2009, 25(8): 46-50.

参数	取值
采样频率（MHz）	4.096
FFT点数	256	512	1 024
子载波间隔（kHz）	16	8	74
每帧采样点数	2 072	3 864	7 448
TTI（ms）	0.4734	0.91089	1.8
可用子载波／全部子载波	100%
信道类型（最大延迟）	TU（5 μs）
CP长度（保护间隔）	21（5 μs）
信道估计方法	LS（1east square）
信道编码	无
调制方式	QPSK
信噪比（dB）	0、5、10、15、20
多普勒频移概率分布	均值0，方差1 000的正态分布

信噪比	0	5	10	15	20
4～8 kHz	325	305	290	275	250
8～16 kHz	785	735	705	690	675

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3	Heidi S ， Marc M . Analysis and optimization of the performance of OFDM on frequency selective time selective fading channels. IEEE Transactions on Communications， 1999，47（12）：1811～1819
4	Suvra S D ， Carvalho E D ， Ramjee P . Variable sub-carrier bandwidths in OFDM systems.In： IEEE Vehicular Technology Conference， Dublin，Ireland， 2007
5	Zhou Kainan ， Huat C Y . Maximum bandwidth of orthogonal frequency division multiplex （OFDM）over multipath fading channe1.In： 2004 International Conference on Communications，Circuits and Systems， Chengdu，China， 2004

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Research on Spectrum Efficiency Maximizing of OFDM System

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