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This paper characterizes the spatially-normalized degrees of freedom (DoF) of a 2-cell, 3-user per cell multiple input multiple output (MIMO) cellular networks with M antennas at each user and N antennas at each base station. We show that the spatially-normalized DoF is a piecewise linear function, with either M or N being the bottleneck. Given γ = M / N, we shown that for there is redundancy in...
Large antenna arrays are usually used in 60GHz for beamforming to compensate the high path loss in this band. IEEE 802.15.3c adopted a beamforming codebook design to reduce the cost and power consumption of the large array, but which is not enough to deal with interference in a dense network. This paper proposed a mixed analog and digital receiver beamforming structure with subarray partition, which...
To improve the network capacity and reduce interference, directional antenna has been used in ad hoc networks for a long time. Due to the drawbacks of random access MAC protocols with directional antennas such as inevitable collisions, a distributed TDMA-based directional MAC protocol for ad hoc networks is proposed in this paper. It takes the advantage of real-time capability of TDMA and spatial...
In this paper, we investigate the two unique features of 60GHz mmWave links: inherent directivity and susceptible to blockage of human body. Due to the narrowed transmission beam of directional antenna, a moving human may cause link breakage and degradation. A fast relay selection and STDMA scheduling scheme is proposed to maintain the stability of the mmWave links and maximize the overall throughput...
In this paper, a cluster-based virtual multiple-input multiple-output (MIMO) transmission architecture is proposed for energy-constrained wireless sensor networks. In the proposed architecture, instead of using cluster members as cooperative nodes, multiple cluster heads cooperate to form virtual antenna array so that MIMO transmission can be implemented. According to the MIMO techniques used in this...
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