Masayuki Nakada

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Abstract— A throughput performance significantly degrades near the cell edge due to the path loss, shadowing loss, and multipath-fading. A cooperative relay is a well-known technique to increase the cell-edge throughput. In the cooperative relay, it is expected that assigning different levels of data modulation for mobile terminal (MT) and relay station(More)
In this paper, we propose a spectrum division & adaptive subcarrier allocation for cooperative amplify-and-forward (AF) relay using single carrier-frequency division multiple access (SC-FDMA). To obtain increased frequency diversity gain, the transmit SC signal spectrum is divided into sub-blocks, to each of which a different set of subcarriers(More)
Abstract— In this paper, we propose a direct/cooperative amplify-and-forward relay (D/AR) switching using a spectrum division/adaptive subcarrier allocation (SDASA) for increasing the uplink capacity of single carrier-frequency division multiple access (SC-FDMA). In the D/AR switching, switching between direct communication and cooperative AF relay is done(More)
OBJECTIVES To examine the association between cardiopulmonary bypass-related systemic inflammation and resting energy expenditure in pediatric subjects following cardiac surgery. DESIGN Single-center, prospective cohort study. SETTING Pediatric cardiac critical care unit in Toronto, Canada. PATIENTS Children with congenital heart disease undergoing(More)
あらまし 本稿では,マルチアンテナ送受信(MIMO)とアナログネットワーク符号化(ANC)を用いるシング ルキャリア(SC)双方向中継通信を対象とした送受信協調周波数領域等化(FDE)を提案する.提案送受信協調 FDE では,複数送受信アンテナを搭載した中継局で送信 FDE を用いたアンテナダイバーシチ送信を行い,単一アンテナ を搭載した端末および基地局で受信 FDE を行う.ANC 双方向中継通信では,中継局で加わった雑音が上下リンク で異なるチャネルを伝搬して受信されるため,上下リンクの平均二乗誤差(MSE)を同時に最小化する中継局送信 FDE は存在しない.そこで,送受信協調 FDE では上下リンクのどちらか一方のリンクの MSE を最小化するよう, 中継局送信 FDE(More)
Abstract— In this paper, we propose a power allocation method for the direct/cooperative amplify-and-forward (AF) relay switched SC-FDMA using spectrum division/adaptive subcarrier allocation (SDASA). The cooperative relaying is used only when it can achieve higher channel capacity than the direct communication. In the proposed power allocation method,(More)
Modulation Assignment for Uplink Single Carrier Cooperative DF Relay Kazuhiro KIMURA Masayuki NAKADA Tatsunori OBARA and Fumiyuki ADACHI Dept. of Information and Intelligent Systems, School of Engineering, Tohoku University Dept. of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University 6-6-05 Aza-Aoba, Aramaki, Aoba-ku,(More)
Relay using analog network coding (ANC) can achieve the same maximum throughput as the direct transmission while reducing the required transmit power. In this paper, we propose an adaptive power allocation scheme for bidirectional single-carrier (SC) ANC. The proposed scheme adaptively allocates the transmit power so as to make the instantaneous(More)