Space–Time Physical-Layer Network Coding


A house–time physical-layer network coding (ST-PNC) technique is presented for information exchange among multiple users over absolutely connected multiway relay networks. The method involves two steps: 1) aspect-information learning and 2) house–time relay transmission. In the first step, completely different sets of users are scheduled to send signals over networks, and therefore the remaining users and relays overhear the transmitted signals, thereby learning the interference patterns. In the second step, multiple relays cooperatively send out linear mixtures of signals received within the previous part using house–time precoding therefore that every one users efficiently exploit their aspect data in the shape of one) what they sent and a pair of) what they overheard in decoding. This coding concept is illustrated through two simple network examples. It's shown that ST-PNC improves the add of degrees of freedom (sum-DoF) of the network compared to existing interference management strategies. With ST-PNC, the sum-DoF of a general multiway relay network without channel data at the users is characterised in terms of relevant system parameters, chiefly the quantity of users, the quantity of relays, and the quantity of antennas at relays. A serious implication of the derived results is that efficiently harnessing each transmitted and overheard signals as facet info brings significant performance improvements to fully connected multiway relay networks.

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