Physical Layer Network Coding Using Gaussian Waveforms: A Link Level Performance Analysis

Abstract:
Using general waveforms has recently gained omnipresent attention for robustness in systems under practical constraints. In this paper, two way relaying networks using physical layer network coding utilizing a multicarrier scheme with Gaussian waveforms are analyzed. This combination is introduced to be more robust against the impact of carrier frequency offsets and timing offsets. In two way relaying a multiple access phase is applied, where both users transmit their messages simultaneously on the same resources to an assisting relay. Here, a superposition of both signals containing the influence of the individual channels is received. The additional interference introduced by the non-orthogonal Gaussian filter is treated by a linear equalizer. To reduce complexity the equalizer is simplified to treat adjacent symbols in the time-frequency grid, only. To evaluate the overall performance of the introduced equalizer, different decoding strategies are analyzed by means of a link level simulations.