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In this paper, we design a signal alignment scheme that exploits orthogonality of spatial signalling dimensions in the multiple-input multiple-output (MIMO) Y channel, where three users send messages to each other through a relay. The antenna configuration in the original MIMO Y channel system imposes limitations on controlling the minimum distance between signaling points representing network coded...
This paper presents an inter-relay interference (IRI) cancellation scheme in amplify-and-forward (AF) cellular-type networks with successive downlink forwarding. In these half-duplex alternate relaying systems with two hops, the wireless medium in both hops is always utilized through the simultaneous transmissions of the base station (BS) and one of the relays which in turn causes IRI. In this work,...
This paper presents space-time block codes (STBC) constructed by the orthogonalization of Walsh-Hadamard transform domain coefficients. The novel Walsh-Hadamard STBC (WHSTBC) provides full rate and full diversity order when the number of receive antennas is at least equal to the number of transmit antennas, with appropriate pre-coding of the PSK or QAM modulated symbols. Hadamard matrices exist for...
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