In this paper, we propose the superposed multi-carrier transmission which superposes spectra of a satellite communication system and a land mobile communication system. It is evaluated that its applicability when interference suppression schemes for transmitters and receivers are adopted only for the land mobile communication system, with no change for the satellite communication system. We have proposed FEC metric masking processing as an interference suppression scheme, in which FEC encoded packets are decoded after the metrics of interfered subcarriers are replaced to the most ambiguous values in the receiver. We also have proposed a cyclical decoding scheme, which updates the metric of subcarriers on superposed bandwidth by newly calculated metric from replica bits to offer higher reception performance, hi this paper, we introduce a simple subcarrier puncturing scheme for transmit spectrum filtering. By computer simulation we show that the proposed scheme is able to improve the D/U vs BLER performance and that the area limitation of the land mobile communication system does not depend to received C/N for the satellite communication system.%本稿では衛星通信システムと陸上無線通信システムのスペクトラムを重ね合わせて周波数利用効率を向上させるマルチキャリア重畳伝送を提案する．提案方式では，衛星通信システム側に改変を加えずに，陸上無線通信システム側のみに与干渉抑圧機構および被干渉抑圧機構を備えることで周波数の共用を可能とする．筆者らがこれまでに提案した受信側被干渉抑圧法である，重畳帯域の尤度情報を最も曖昧な値に置換してから復号を行うFEC 尤度マスク法と，重畳帯域の尤度情報を順次更新しながら復号を行う巡回型FEC 復号に加えて，サブキャリアバンクチャリングによる送信スペクトルフィルタリングを導入した．計算機シミュレーションにより，陸上無線通信システムへ干渉抑圧機構を導入することで陸上無線通信システムのD/U-BLER 特性を大幅に改善し，またその通信エリア限界は衛星通信システム側の受信C/N 値に依存しないことを示す．
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