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We present a new physical layer network coding (PLNC) scheme, called superimposed XOR, for two-way relay channels. The new scheme specifically takes into account the channel as well as information asymmetry in the broadcast phase of two-way relaying. It is based upon both bitwise XOR and symbol-level superposition coding. We first derive its achievable rate regions when integrated with two known time...
We consider the problem of cooperative communication for a network composed of two half-duplex parallel relays with additive white Gaussian noise. Two protocols, i.e., Simultaneous and Successive relaying, associated with two possible relay orderings are proposed. The simultaneous relaying protocol is based on dynamic decode and forward (DDF) scheme. For the successive relaying protocol, a Non-Cooperative...
We consider the problem of transmission over an unknown time-varying Gaussian channel, whose signal-to-noise ratio (SNR) is constant within a block but varies arbitrarily between blocks. For this scenario, we develop efficient automatic repeat request (ARQ) protocols in the form of low-complexity rateless codes, which encode a message into a sequence of incremental redundancy blocks. Following the...
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