[依頼講演]衛星通信における多偏波空間多重伝送技術の提案

摘要

Satellite communications are expected to cope flexibly with the increased traffic load from mobile communications such as by ship and also to reduce costs. Several methods to improve the frequency efficiency by combining the orthogonal horizontal/ vertical polarizations have been studied. In this paper, to improve frequency efficiency, we propose both a non-orthogonal polarization multiplexing method which combines not necessarily orthogonal multi-polarized signals, and a multi-polarization space modulation method in which the constellation is constructed by the addition of a new polarization angle in addition to the conventional orthogonal modulation. From the bit-error-rate(BER) results of a computational simulation, we show that each proposed method can achieve greater BER performance than that of the conventional method.%衛星通信では，船舶や列車などの移動体通信におけるトラフイツク増加への対応や低コスト化が期待されており，直交する水平/垂直2偏波に信号を多重して周波数利用効率を向上させる方式が研究されている.ここでは，さらなる周波数利用効率の向上を目指し，必ずしも直交しない複数偏波に信号を多重することで伝送情報量を増大させる非直交偏波多重方式と，従来の直交変調方式に新たな偏波角制御を加えて信号点を表現することで変調多値数を増大させる多偏波空間変調方式を提案する.計算機シミュレーションによる誤り率特性の評価を行い，各提案方式では従来方式よりも優れた誤り率特性が得られることを示す.