動的MIMO検出法を用いたMIMO-OFDM受信機回路の低消費電力化

摘要

本報告では動的MIMO検出法を用いたMIMO-OFDM受信機回路の低消費電力化手法を提案する．MI-MO-OFDM方式では，受信機側で多重送信された信号を分離するためのMIMO検出が必要となるが，演算量が多く，MIMO検出処理の消費電力が大きくなる．これを解決するため，本研究では複数パケットに渡ってMMSE基準のウェイト行列計算を行う動的MIMO検出法を導入し，MIMO検出回路の動作周波数と動作電圧を動的に与えるDVFS技術により低消費電力化を行う手法を提案する．また，以前の研究で開発したパイプライン型MMSE検出回路に提案手法を実装した場合の通信性能と消費電力評価結果を合わせて報告する．%This presents power reduction for MIMO-OFDM receiver circuits using dynamic MIMO detection techniques. MIMO-OFDM imposes MIMO detection to separate received signals multiplexed in the transmitter, however MIMO detection has huge amount of computations, which increases power consumption. To solve this, we propose a technique to reduce power consumption by introducting dynamic MIMO detection and dynamic voltage and frequency scaling ( DVFS ). Dynamic MIMO detection computes the weight matrix across multiple packets. A DVFS technique gives a dynamic operating voltage and frequnency to the MIMO detector circuit. This circuit has been implemented in to pipelined MMSE detector curciuts developed in our previous studies. We report the evaluation results in communication performance and power consumption.