公衆移動通信システムの発展では，無線周波数帯域を有効に利用するたやの伝送技術が追求されて来た．また，利便性の高い携帯機と経済的なシステムの実現には半導体集積回路技術が不可欠であった．本報告ではこれらのトレンドと今後の課題について概観する．まず，移動無線システムの発展経緯から，高速化・大容量化のトレンドをみる．また，ビットレートと無線周波数の関係を明らかにする．次に，Si-CMOSの高周波化のトレンドから，RF-CMOSと高速信号処理の可能性を探る．次に，無線通倍における干渉の分類，等化，干渉キャンセルおよびMIMO伝送に関する信号処理方法の分類を行い，その動向について概括する．さらに，チャネル推定のための適応アルゴリズムの劣化要因，MAPによる高性能化について簡単に述べる．ファクターグラフを用いたモデルの表示，推定法におけるメッセージ・パッシングの規則について述べる．%In public mobile communication systems the signal transmission technology of spectral efficient utilization has been developed, and the technology of semiconductor circuit integration also has played an important role in order to implement smart portable telephone sets and economical systems. The first part of this report reviews trends and technical subjects of those technologies. The trend of the mobile radio systems development shows an increase of bit-rate and channel capacity. The relationship between the bit-rates and the radio frequencies of previously developed systems is shown. From the trends of the Si-CMOS process, future of RF-CMOS and high speed signal processing is discussed. Next, recent signal processing advancement in mobile communication systems is discussed. Interferences are classified, and a classification of signal processing in equalization, interference cancellation, and MIMO transmission is tabulated. Topics of those processing techniques are briefly reviewed. In the adaptive channel estimation, several degradation factors and performance enhancement by MAP recently investigated are reviewed. Applications of factor graph to the transmission model, and the message-passing algorithm are reviewed.
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