超高速衛星通信のための多レベル符号化変調を用いたCODECの研究

概要

論文の詳細を見る
One of the key technologies for realizing high data rate (HDR) satellite is to design efficient HDR codec. Future HDR satellite systems operating at SONET compatible rates will require the development of bandwidth efficient modulation formats which are capable of operating through restricted channel bandwidths which include nonlinear elements such as travelling wave tube amplifiers (TWTA's). Achieving such high rates with acceptable bit error rate (BER) performance may be difficult in systems in which both power and bandwidth are limited. Additionally, such considerations as size, weight, and feasibility must also be taken under consideration for the modem design. Multidimensional trellis coded modulation is one possible solution. Howevrer, the drawback is the enermous complexity. Multilevel code construction is an attractive solution to achicve multidimensional feature. In this paper, we propose a concatenated codec, where outer RS code is concatenated with multidimensional modulatlion code derived from the multilevel code structure for HDR application. Very fast and efficient decoding algorithm is employed.
社団法人電子情報通信学会の論文
1997-03-06