基于OFDM的數(shù)字廣播系統(tǒng)模型研究及子載波數(shù)目確定
Research about the ofdm-based digital broadcasting system model and decision about the number of the total subcarriers
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摘要: 作為時變的多徑信道,中短波信道的時變性導致基于OFDM數(shù)字調(diào)幅廣播系統(tǒng)各個子信道間產(chǎn)生干擾,簡稱ICI。該文首先分析OFDM系統(tǒng)在一般時變多徑信道的模型,在此基礎上推導了中短波信道時變特性在OFDM系統(tǒng)中所產(chǎn)生的ICI公式,最后利用該公式通過計算機數(shù)值計算確定在ICI可忽略不計的情況下,OFDM系統(tǒng)的總的子載波數(shù)目N的最大值,而該值的確定對于基于OFDM的數(shù)字調(diào)幅廣播系統(tǒng)是非常重要的。Abstract: As time-variant multipath channels, the time-variant property of MW and SW channels causes the interchannel interfere (ICI) between different subchannels of OFDM-based digital amplitude modulation broadcasting (DAMB) system. In this paper, the OFDM system model is analyzed in MW and SW channels, and ICI due to time-variant channel is formulated. Finally, by computer simulation, the maximum number of the total subcarrier in OFDM system is estimated under the condition that ICI is much smaller compared to signal. This value is very important for the DAMB system.
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DRM proposal for a digital radio system for application in the broadcasting bands below 30MHz,2000.4 ［2］Y.S. Choi, P. J. Voltz, P. A. Cassara, On channel estimation and detection for multicarrier signalsin fast and selective Rayleigh fading channels [J], IEEE Trans. on Communications, 2001, 49(8),1375-1487.[2]J.G. Proakis, Digital Communications, 3rd ed. New York, McGraw-Hill, 1995, 878-965.[3]束鋒,OFDM技術及其在數(shù)字調(diào)幅廣播信道中的應用研究[博士論文],第三章,東南大學,2002,26-35. -
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