Multiuser Detection
Hot topic: physical-layer network coding
Proceedings of the 12th annual international conference on Mobile computing and networking
Embracing wireless interference: analog network coding
Proceedings of the 2007 conference on Applications, technologies, architectures, and protocols for computer communications
Optimizing training lengths and training intervals in time-varying fading channels
IEEE Transactions on Signal Processing
Spectral efficient protocols for half-duplex fading relay channels
IEEE Journal on Selected Areas in Communications
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The wireless network scenario here is based on N users that communicate one with the others through a central relay node by adopting the Analog Network Coding (ANC) paradigm. In this paper, we propose a communication scheme for ANC able to guaratee the simultaneous transmissions of N ≥ 2 interfering terminals using the concept of multiuser processing (i.e., channel estimation and detection). Under the assumption of slow-varying channels, multi-link channel estimation is achieved through the coherent summation at the physical layer of the invariant training sequences over the different frames, thus enabling multiuser detection. Benefits of the proposed ANC protocol are stressed through comparisons with the traditional TDMA-based routing scheme where the relay is time-shared among the different users. Impacts of the hindrances to our scheme (namely, hardware impairments at the nodes and finite coherence-time of the channels) are also investigated by numerical analysis. The proposed algorithm enables the employment of simple sense-before-talk policies at each user interested in accessing the network, thus avoiding complex forms of centralized coordination by the relay.