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Low Complexity Iterative Precoder for Downlink MU-MIMO Systems
Naotaka Yoshida,Yuji Yokota,Yuhei Nagao,Hiroshi Ochi 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Block diagonalization (BD) precoder is used for Multi-User Multiple Input Multiple Output (MU-MIMO) IEEE 802.11ac Wireless LAN. To improve the latency of the MU-MIMO systems, the BD precoder using iterative calculation has been proposed. We call this method Iterative BD (IBD). IBD can start the MU-Precoder weight matrix calculation even before all user’s channel state information (CSI) are received. However IBD has a higher complexity compared to non-iterative BD because of the overhead of iterative calculation. In this paper, we reduce the complexity due to the iteration process by computing the null space needed in the IBD method together with the channel matrix decompression which is applied by CSI feedback process based on IEEE802.11ac. We show that our method can significantly reduce the complexity of IBD.
Study for grain-filling of rice using 13C labeling flow-metabolome analysis
Okamura Masaki,Hirai Masami Yokota,Sawada Yuji,Okamoto Mami,Arai-Sanoh Yumiko,Yoshida Hiroe,Mukouyama Takehiro,Adachi Shunsuke,Fushimi Erina,Yabe Shiori,Nakagawa Hiroshi,Kobayashi Nobuya,Kondo Motohik 한국작물학회 2017 한국작물학회 학술발표대회 논문집 Vol.2017 No.-