High Data Rate OFDM System with Simplified DAPSK Demodulation  

作　　者：LIU Kai-ming WANG Wen-bo LIU Yuan-an 

机构地区：[1]Center for Wireless Communications, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2005年第2期30-34,共5页中国邮电高校学报（英文版）

基　　金：This workis supported by National"863"High Technology Projects of China (G1999035804) .

摘　　要：In this paper, a simplified differential amplitude demodulation scheme for high-level Differential Amplitude and Phase Shift Keying （DAPSK） techniqus is proposed, which requires fewer thresholds for demodulation and thus has lower complexity. The performance of the Orthogonal Frequency Division Multiplexing （OFDM） system combined with the simplified DAPSK scheme is investigated over frequency-selective fading channels, then. Compared with coherent QAM-OFDM system, DAPSK-OFDM system has much lower complexity since channel estimation and equalization are unnecessary. Further more, under the condition of the same data rate, DAPSK-OFDM can achieve the performance close to or even better than that of QAM-OFDM system which adopts pilot symbols for channel estimation, by employing the concatenated code and utilizing the additional redundancy for outer coding at high Signal-to-Noise Ratios （SNRs）.In this paper, a simplified differential amplitude demodulation scheme for high-level Differential Amplitude and Phase Shift Keying （DAPSK） techniqus is proposed, which requires fewer thresholds for demodulation and thus has lower complexity. The performance of the Orthogonal Frequency Division Multiplexing （OFDM） system combined with the simplified DAPSK scheme is investigated over frequency-selective fading channels, then. Compared with coherent QAM-OFDM system, DAPSK-OFDM system has much lower complexity since channel estimation and equalization are unnecessary. Further more, under the condition of the same data rate, DAPSK-OFDM can achieve the performance close to or even better than that of QAM-OFDM system which adopts pilot symbols for channel estimation, by employing the concatenated code and utilizing the additional redundancy for outer coding at high Signal-to-Noise Ratios （SNRs）.

关 键 词：DAPSK OFDM flat fading frequency-selective fading 

分 类 号：TN911.3[电子电信—通信与信息系统]