編碼16DAPSK 信號解調(diào)譯碼新方法
A Novel Demodulation Decoding Method for Coded 16DAPSK Signals
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摘要: 基于子載波采用16階差分幅度相移鍵控(16DAPSK)的正交頻分復(fù)用(OFDM)系統(tǒng)，提出并分析了編碼16DAPSK信號的一種新的簡單易行的比特軟輸出解調(diào)譯碼方法。仿真結(jié)果表明，在高斯信道、平坦Rayleigh衰落信道和多徑Rayleigh衰落信道下，采用編碼速率為3/4的punctured卷積碼與16DAPSK信號的硬輸出解調(diào)譯碼方法相比，系統(tǒng)的誤碼性能可改善約1.2dB。新方法應(yīng)用在日本CRL開發(fā)的100Mbps毫米波16DAPSK-OFDM寬帶移動接入實驗系統(tǒng)，將進一步提高系統(tǒng)誤碼性能。
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關(guān)鍵詞:
- 差分幅度相移鍵控; 軟輸出解調(diào); 正交頻分復(fù)用
Abstract: An OFDM system with 16DAPSK modulation for each subcarrier is considered. In this paper, a novel bit soft-output demodulation decoding scheme which is simpler to implement for coded 16DAPSK signal is proposed and investigated. The simulation results show that about 1.2dB performance gain can be achieved in AWGN, flat Rayleigh fading, and multipath Rayleigh fading channels with forward error correct coding (rate 3/4, punctured convolutional coding) compared with hard-decision decoding. The Bit-Error-Rate (BER) will be reduced if this method is applied in 100Mbps 16DAPSK-OFDM millimeter-wave broadband mobile access experimental system developed by CRL in Japan. -
濱口 清，辻 宏之，小川博世.ミリ波広帯域移動アクセスシステム用100Mbps-OFDMモデムの開発[J] . 信學(xué)技報， Technical Report of IEICE, 2001, CS2001-44, RCS2001-51:1-7.[2]Moriyama S, Tsuchida K, Sasaki M. Digital transmission of high bit rate signals using 16DAPSK-OFDM modulation scheme [J].IEEE Trans. on Broadcasting.1998, 44(1):115-122[3]Engels V, Rohling H. Digital modulation in techniques for a 34Mbit/s radio channel using orthogonal frequency division multiplexing[J]. Wireless Personal Communications-(Special Issue on Multi-carrier Communications), 1995, 2 (12): 29-44.[4]Rohling H, May T, Brninghaus K, Grnheid R. Broad-band OFDM radio transmission for multimedia applications [J].Proc IEEE.1999, 87(10):1778-1789[5]May T, Rohling H, Volker E. Performance analysis of Viterbidecoding for 64-DAPSK and 64-QAM modulation OFDM signals[J].IEEE Trans. on Communications.1998, 46(2):182-190[6]Bahai A R S.[J].Saltzberg B R. Multi-carrier Digital CommunicationsTheory and Application of OFDM, New York: Mc-Graw-Hill.1999,:- -
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