Hot topic: physical-layer network coding
Proceedings of the 12th annual international conference on Mobile computing and networking
Digital Signal Processing (4th Edition)
Digital Signal Processing (4th Edition)
Embracing wireless interference: analog network coding
Proceedings of the 2007 conference on Applications, technologies, architectures, and protocols for computer communications
XORs in the air: practical wireless network coding
IEEE/ACM Transactions on Networking (TON)
IEEE Transactions on Information Theory
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Recently, there has been a growing interest in physical-layer network-coding techniques that facilitate information transfer in wireless relay networks. Physical-layer network-coding techniques take advantage of the additive nature of wireless signals by allowing two terminals to transmit simultaneously to the relay node. This technique has several performance benefits, such as improving utilization and throughput of wireless channels and reducing delay. In this paper, we present an algorithm for joint decoding of two unsynchronized transmitters to the modulo-2 sum of their transmitted messages. We address the problems that arise when the boundaries of the signals do not align with each other and when their phases are not identical. Our approach uses a state-based Viterbi decoding scheme that takes into account the timing offsets between the interfering signals. Our simulation studies show that this decoder outperforms previous approaches in the presence of noise and timing offset.