On the Practical Physical-Layer Network Coding with Partially Overlapped Packets

ABSTRACT In this paper, we investigate the physical layer network coding (PNC) technique in a two-way relay channel (TWRC) where two source nodes send and receive data with each other via a relay node. In particular, we consider the communication scenario where packet length from the two sources is different from each other. We analyze the bit error rate (BER) of the received packet at the relay node according to degree of overlapping between two packets. The BER of the short packet remains unchanged regardless of the degree of overlapping since the entire packet is overlapped with the longer packet, while the BER of the longer packet becomes improved as the degree of overlapping decreases. Thus, we need a novel transmission scheme to enhance BER performance of the PNC technique in TWRC environments since the overall BER performance of the PNC technique at the relay node depends on the worse BER between two ovelapping packets’ BERs. 키워드 : 양방향 중계 기술, 물리계층 네트워크 코딩, 채널 코딩, 패킷 겹침 Key word :

[1]  Joohwan Chun,et al.  Zero-forcing-based two-phase relaying with multiple mobile stations , 2008, 2008 42nd Asilomar Conference on Signals, Systems and Computers.

[2]  Zhixin Liu,et al.  Physical-layer network coding in optical networks , 2013, 2013 12th International Conference on Optical Communications and Networks (ICOCN).

[3]  Philip Levis,et al.  Applications of self-interference cancellation in 5G and beyond , 2014, IEEE Communications Magazine.

[4]  Bang Chul Jung,et al.  A Practical Physical-Layer Network Coding for Fading Channels , 2010, J. Inform. and Commun. Convergence Engineering.

[5]  Seong Hwan Kim,et al.  Transmit Power Optimization for Two-Way Relay Channels With Physical-Layer Network Coding , 2015, IEEE Communications Letters.

[6]  Armin Wittneben,et al.  Spectral efficient protocols for half-duplex fading relay channels , 2007, IEEE Journal on Selected Areas in Communications.

[7]  Pei Liu,et al.  Full duplex cellular systems: will doubling interference prevent doubling capacity? , 2015, IEEE Communications Magazine.