Physical-Layer and Digital Network Coding Switching Scheme Over Two-Way Relaying
نویسندگان
چکیده
In this work, we consider a typical three-node, two-way relaying network (TWRN) over fading channels. The aim is to minimize the entire system energy usage for a TWRN in the long run, while satisfying the required average symmetric exchange rate between the two source nodes. To this end, the energy usage of the physical-layer network coding (PNC) or the superposition coding based digital network coding (SPC-DNC) is analyzed. The rule on selection of both strategies is then derived by comparison. Based on the observed rule, we then design a scheme by switching between PNC and SPCDNC for each channel realization. The associated optimization problem, through PNC/DNC switching, as well as power allocation on the uplink and the downlink for each channel realization is formulated and solved via an iterative algorithm. It is demonstrated that this switching scheme outperforms the schemes solely employing PNC or SPC-DNC through both theoretical analysis and simulations. Index Terms network coding, two-way, resource allocation, switching.
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ورودعنوان ژورنال:
- CoRR
دوره abs/1512.03982 شماره
صفحات -
تاریخ انتشار 2015