數字電視廣播－數字衛星新聞采集標準(DVB-DSNG)把實用網格編碼調制(P-TCM)作為可選的內編碼和調制方式，在保持信息速率且不增加帶寬的情況下提高功率利用率。本文針對DVB-DSNG 系統，提出了一種P-TCM 解碼器的設計方案，根據計算機仿真結果對算法的參數進行了優化，并在FPGA 上進行了設計的驗證。
關鍵字：數字視頻廣播；網格編碼調制；維特比解碼器；分支度量
Design of Decoder for P-TCM in DVB-DSNG System
YU Xi
(Design Center of Communication Software and ASIC, Tongji University, Shanghai, 200092)
Abstract: DVB-DSNG Standard employs P-TCM as an optional inner coding and modulation scheme to attainenergy efficiency under the condition of maintaining the information rate and with no need to extend the bandwidth.Focusing on the DVB-DSNG system, this paper presents a design scheme for P-TCM decoder with optimal parameters determined through computer simulation and verified on FPGA.
Key Words: DVB; Trellis Coded Modulation; Viterbi Decoder; Branch Metric