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Research and development on the next generation wireless systems, namely 5G, has experienced explosive growth in recent years. In the physical layer, the massive multiple-input-multiple-output (MIMO) technique and the use of high GHz frequency bands are two promising trends for adoption. Millimeter-wave (mmWave) bands, such as 28, 38, 64, and 71 GHz, which were previously considered not suitable for...
High cost of millimeter wave (mmWave) hardware precludes the possibility to support each antenna element with a dedicated radio frequency (RF) chain in large-scale mmWave systems. It thus makes conventional baseband precoding, such as zero-forcing (ZF) which is deemed virtually optimal in the large array regime, impractical. In this paper, we consider the RF chain limitations present in large mmWave...
This paper studies the multi-antenna relay downlink channel with quantized channel information feedback from both two-hop links. By characterizing the system capacity loss due to channel quantization, we propose a strategy of controlling feedback sizes to help the system approach the channel capacity with respect to full channel information case within an arbitrary predetermined capacity loss. It...
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