Physical-layer communications using direct antenna modulation

摘要: Conventional wireless communications could be threatened by an eavesdropper with a sufficiently sensitive receiver and unlimited computational resources, or may reach the channel capacity in near future. Recent research into new digital modulation technique termed Direct Antenna Modulation (DAM) shows that DAM is potential solution to aforementioned problems. Direction-dependency, which describes manner of signal transmission, most important attribute system. Direction-dependent transmission can provide extra protection from physical-layer source against security attack. Various schemes are discussed this work, it shown accurate demodulation prevented eavesdropping following two scenarios: first, when angular separation between intended recipient very small; second, one directions pre-known. In addition, system configured have resources introducing space as additional domain for multiplexing. With multiplexing, transmitter send independent data streams towards multiple receivers located at various simultaneously. An algorithmic method also presented multiplexing relatively low cost.