2015/01/11 by Hossein Shokri‐Ghadikolaei, Shokri-Ghadikolaei, Hossein, Lazaros Gkatzikis +3 · 2 citations
Engineering · #Advanced MIMO Systems Optimization #FOS: Computer and information sciences #Information Theory (cs.IT) #Microwave Engineering and Waveguides #Millimeter-Wave Propagation and Modeling #Performance (cs.PF)
paper · pdf · doi:10.48550/arxiv.1501.02516
openalex publication_date 2015/01/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Millimeter wave (mmW) wireless networks are capable to support multi-gigabit\ndata rates, by using directional communications with narrow beams. However,\nexisting mmW communications standards are hindered by two problems: deafness\nand single link scheduling. The deafness problem, that is, a misalignment\nbetween transmitter and receiver beams, demands a time consuming beam-searching\noperation, which leads to an alignment-throughput tradeoff. Moreover, the\nexisting mmW standards schedule a single link in each time slot and hence do\nnot fully exploit the potential of mmW communications, where directional\ncommunications allow multiple concurrent transmissions. These two problems are\naddressed in this paper, where a joint beamwidth selection and power allocation\nproblem is formulated by an optimization problem for short range mmW networks\nwith the objective of maximizing effective network throughput. This\noptimization problem allows establishing the fundamental alignment-throughput\ntradeoff, however it is computationally complex and requires exact knowledge of\nnetwork topology, which may not be available in practice. Therefore, two\nstandard-compliant approximation solution algorithms are developed, which rely\non underestimation and overestimation of interference. The first one exploits\ndirectionality to maximize the reuse of available spectrum and thereby\nincreases the network throughput, while imposing almost no computational\ncomplexity. The second one is a more conservative approach that protects all\nactive links from harmful interference, yet enhances the network throughput by\n100% compared to the existing standards. Extensive performance analysis\nprovides useful insights on the directionality level and the number of\nconcurrent transmissions that should be pursued. Interestingly, extremely\nnarrow beams are in general not optimal.\n