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KAKEN_25420382seika.pdf
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誤り訂正符号を用いた過負荷MIMOシステムの低演算量信号分離法の研究
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アヤマリ テイセイ フゴウ オ モチイタ カフカ MIMO システム ノ テイエンザンリョウ シンゴウ ブンリホウ ノ ケンキュウ
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Ayamari teisei fugo o mochiita kafuka MIMO shisutemu no teienzanryo shingo bunriho no kenkyu
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Research on low computational complexity signal de-multiplexing schemes for overloaded MIMO systems
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眞田, 幸俊
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サナダ, ユキトシ
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Sanada, Yukitoshi
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慶應義塾大学・理工学部・教授
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Research team head
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科研費研究者番号 : 90293042
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2016
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科学研究費補助金研究成果報告書
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2015
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本研究では, 誤り訂正符号を用いた過負荷MIMO-OFDM伝送方式を検討した。 検討の結果, 提案方式は誤り訂正符号にブロック符号を用いた場合, 誤り率特性を維持しながら統合最尤復号の復号演算量を1/40に低減した。さらに誤り訂正符号にTrellis符号を用い, スループットを維持したまま特性を改善するシステムも提案し, 受信信号電力が高い領域で特性を維持しつつ計算量を約 1/16に低減した。また非直交多元接続システムにおいて統合最尤復調により信号分離処理を行うシステムを検討した。基地局近傍端末および基地局から遠方の端末両方において統合最尤復調を適用することによって全体のスループットが改善した。
This research focuses on an overloaded multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. One of the problems in the overloaded MIMO-OFDM system is the performance degradation due to spatial signal multiplexing. In the conventional MIMO system, antenna diversity in a receiver suppresses the performance degradation. Instead, a proposed overloaded MIMO system applies forward error correction coding. With the use of coding, frequency diversity can be realized and it suppresses the performance degradation owing to spatial signal multiplexing. The problem of the use of coding is that the complexity of joint maximum likelihood decoding (MLD) increases exponentially with the number of signal streams. Thus, this research proposes the complexity reduction schemes in the overloaded MIMO-OFDM systems. Furthermore, the joint MLD is applied to user terminals in a non-orthogonal multiple access system for improving the throughput of a NOMA downlink.
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研究種目 : 基盤研究(C)(一般)
研究期間 : 2013~2015
課題番号 : 25420382
研究分野 : 無線通信
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