Adaptive modulation and network coding with optimized precoding in two-way relaying

Authors:
Toshiaki Koike-Akino;Petar Popovski;Vahid Tarokh
Affiliations:
School of Engineering and Applied Sciences, Harvard University, Cambridge, MA;Department of Electronic Systems, Aalborg University, Aalborg, Denmark;School of Engineering and Applied Sciences, Harvard University, Cambridge, MA
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

We propose a precoding strategy which controls amplitude and phase of receiving signals to improve throughput for two-stage bidirectional relaying. We consider the case when the nodes know channel state information (CSI) and can adopt adaptive modulation techniques. We introduce a novel scheme termed adaptive modulation and network coding (AMNC), which jointly optimizes modulations and network coding based on the CSI. For dynamic bit loading and power allocation, we propose a practical time-sharing method called the segmented precoding, in which a packet is split into several sub-packets, and a set of modulation and network coding is optimized in conjunction with amplitude and phase controls for each sub-packet. It is demonstrated that our proposed scheme can offer a significant improvement of achievable throughput for two-way relaying.