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Lattice codes used under the Compute-and-Forward paradigm suggest an alternative strategy for the standard Gaussian multiple-access channel (MAC). It has been proven that decoding an integer linear combination of the transmitted codewords enables higher data rates compared to decoding the messages individually. Recent work of Gasptar et al. proposed a new multiple access channel technique that they...
Interference is usually viewed as an obstacle to communication in wireless networks, so we develop a new methodology to quantize the channel coefficients in order to realize interference alignment onto a lattice and our channel model is the same as the compute-and-forward strategy. In this new methodology, we describe a way to find a doubly infinite nested lattice partition chain for any dimension...
In a recent work, Nazer and Gastpar proposed the compute-and-forward strategy as a physical-layer network coding scheme. They described a code structure based on nested lattices whose algebraic structure makes the scheme reliable and efficient. In a more recent paper, Feng et al. introduced an algebraic approach to the lattice implementation. In this work, we consider some problems not addressed in...
In this work we propose a new amplify-and-forward (AF) protocol and a new decode-and-forward (DF) protocol based on the Alamouti space-time (ST) code, chosen because of its decoding simplicity. We also apply a new selection criterion for AF and DF protocols that improves their performance and solves the problem of bad performance at low SNR. Finally, we apply the Alamouti AF and DF protocols to a...
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