Wireless technologies are an essential communication\nmeans that transform a branched localized fixed\nmeshwork into a ubiquitous disconnected network. A clear\ntrend shows that cells are becoming smaller, homogeneously\ndistributed, operating at higher carrier frequencies, and\nmore energy conscious. This points toward wireless picocell\nsystems that implement millimeter-wave (mm-wave) modulation.\nIn this work various techniques are proposed, which\nare oriented to specific traits of the 60-GHz mm-wave band.\nTwo techniques oriented to solve physical and data-link layer\nissues are proposed. Single carrier frequency division multiple\naccess (SC-FDMA) is proposed as the technology to be\nimplemented at the physical layer, and a variable slot time\nmultiplexing access technique, called variable slot time-time\ndivision multiple access (VST-TDMA), with a conscious\nenergy-conservation protocol, is proposed for the data-link\n(MAC) layer. SC-FDMA with pulse shaping is implemented\nto minimize the peak-to-average power ratio of the system,\nwhich reduces energy consumption. The multiplexing\naccess technique takes advantage of the reduced cell size\nby multiplexing data in the time domain, this allows the\nreduced number of users to utilize the entire available bandwidth.\nIncorporated into the access protocol is the option of\nenergy pacing or even self-sustainability if an energy harvesting\ndevice is present. Self-sustainability can be achieved\nat the cost off throughput, some techniques are discussed to\nrelieve this trade-off condition. Also, a thorough discussion\nis included on battery energy depletion, even with an energy\nharvesting device present, to further increase the through- put performance. Since using SC-FDMA reduces the energy\nconsumption, it enables VST-TDMA to operate at higher\nspeeds under self-sustainability mode. Overall the proposed\nset of solutions showed independently significant improvements\nto the system. It is also discussed howthese techniques\ncoalesce conveniently by working in unison, improving the\nenergy efficiency and throughput capabilities of 60-GHz systems.
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