English

Linear Physical-layer Network Coding in Galois Field for Rayleigh fading 2-Way Relay Channels

Information Theory 2012-11-05 v2 math.IT

Abstract

In this paper, we propose a novel linear physicallayer network coding (LPNC) for Rayleigh fading 2-way relay channels (2-WRC). Rather than the simple modulo-2 (bit-XOR) operation, the relay directly maps the superimposed signal of the two users into the linear network coded combination in GF(2^2) by multiplying the user data by properly selected generator matrix. We derive the constellation constrained capacities for LPNC and 5QAM denoise-and forward (5QAM-DNF) [2] and further explicitly characterize the capacity difference between LPNC and 5QAM-DNF. Based on our analysis and simulation, we highlight that without employing the irregular 5QAM mapping and sacrificing the spectral efficiency, our LPNC in GF(2^2) is superior to 5QAM-DNF scheme in low SNR regime while they achieve equal performance in the the moderate-to-high SNR regime.

Keywords

Cite

@article{arxiv.1210.5660,
  title  = {Linear Physical-layer Network Coding in Galois Field for Rayleigh fading 2-Way Relay Channels},
  author = {Dong Fang and Alister Burr},
  journal= {arXiv preprint arXiv:1210.5660},
  year   = {2012}
}

Comments

There is a a crucial error for the conditons of generating linear combination. The corresponding simulations are thus incorrect. The draft should be withdrawn