Non-Coherent Detection and Denoise-and-Forward Two-Way Relay Networks

作者：Masjedi Maryam; Hoseini Ali Mohamad Doost; Gazor Saeed

来源：IEEE Transactions on Communications, 2016, 64(11): 4497-4505.

DOI：10.1109/TCOMM.2016.2602829

• Denoise-and-forward
• digital network coding
• non-coherent detection
• two-way relay networks

We investigate non-coherent detection of M-ary orthogonal signaling in a denoise-and-forward two-way relay scheme in fast fading, as well as block fading channels. We first design the maximum likelihood, as well as maximum a-posteriori detectors, and then propose a simple suboptimal version for this digital network coding system in Rayleigh fast fading environment. We find exact expression of bit error rate for this suboptimal detector. Interestingly, this suboptimal detector performs only less than 0.25 dB away from optimum, i.e., this expression is a tight upper bound for the performance of the optimal one. Moreover, we derive the optimal detector for the case where the channel amplitudes are known at the relay. To make this detector practical, we propose efficient estimators for the channel amplitudes at the relay for block fading environments. Finally, our simulations reveal the effectiveness of the proposed methods compared with the state-of-the-art method.

• 出版日期2016-11