數(shù)字電視廣播－數(shù)字衛(wèi)星新聞采集標(biāo)準(zhǔn)(DVB-DSNG)把實用網(wǎng)格編碼調(diào)制(P-TCM)作為可選的內(nèi)編碼和調(diào)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(tǒng)，提出了一種P-TCM 解碼器的設(shè)計方案，根據(jù)計算機(jī)仿真結(jié)果對算法的參數(shù)進(jìn)行了優(yōu)化，并在FPGA 上進(jìn)行了設(shè)計的驗證。
關(guān)鍵字：數(shù)字視頻廣播；網(wǎng)格編碼調(diào)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