衰落信道下Turbo網(wǎng)格編碼調(diào)制在圖像傳輸中的性能研究
Research on the Performance of Turbo Trellis Coded Modulation in Image Transmission over Flat Rayleigh Fading Channels
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摘要: 基于Turbo碼和網(wǎng)格編碼調(diào)制的特點,該文分析了TTCM的具體編譯碼方法,并分析比較了TTCM在8PSK調(diào)制下結(jié)合兩種典型映射方案UP(Ungerboeck Partitioning),BP(BlockPartitioning)在Rayleigh信道中用于靜態(tài)圖像傳輸時的性能,給出了計算機仿真結(jié)果和評價圖像傳輸質(zhì)量的峰值信噪比(PSNR).Abstract: In this paper, based on the characteristics of Turbo codes and Trellis Coded Modulation (TCM), an improved method Turbo Trellis Coded Modulation (TTCM) is pre-sented and analyzed over flat Rayleigh fading channels in image transmission with two typical mapping strategies. The selection of different mapping strategies of TTCM in Rayleigh fad-ing channels for image transmission is analyzed and investigated. Furthermore, taking 8PSK modulation of TTCM as the example, two different mapping strategies are compared. Com-puter simulation results and PSNR that can evaluate the quality of the transmitted image are given.
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Berrou C,Glavieux A,Thitimajshima P.Near Shannon limit error-correcting coding and decoding:Turbo-codes (1).Proceedings IEEE ICC93,Geneva,1993:1064-1070.[2]Berrou C,Glavieux A.Near optimum error correcting coding and decoding:Turbo-codes.IEEE Trans.on Comm.,1996,COM-44(10):1261-1271.[3]Ungerboeck G.Channel coding with multilevel/phase signals.IEEE Trans.on Info.Theory,1982,IT-28(1):55-67.[4]Patrick Robertson,Thomas Worz.A novel bandwidth efficient scheme employing Turbo codes.URSIITG Conference,Kleinheubacher Tagung,Oct.1995:96-967.[5]Patrick Robertson,Thomas Woorz.Bandwidth-efficient Turbo trellis-coded modulation using punctured component codes.IEEE J.on SAC.,1998,16(2):206-218.[6]Dongfeng Yuan,Zhiquan Bai,Jiming Ning.Comparison of Turbo trellis coded modulation with different mapping strategies over AWGN channels.Accepted by WWC2003(3Gwirless2003),San Francisco,USA,May 27-30,2003:211-215. -
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