Abstract
In this paper, narrow-band interference (NBI) mitigation is addressed for two-way (TW) relaying amplify and forward (AF) orthogonal frequency division multiplexing (OFDM) systems. Based on the channel gains between the interferer, relay and the terminal nodes two copies of the NBI signal are received at each terminal node in addition to the desired signal. Hence, NBI can degrade the performance of TW-AF-OFDM relaying systems which motivates the need for mitigation techniques to reduce its effect. NBI is a sparse signal in the frequency domain, hence, the compressive sensing (CS) framework can be used to recover NBI and cancel it before detecting the transmitted signal. However, frequency-grid-mismatch destroys the sparsity of the received NBI signal at the terminal nodes. Hence, we propose a block-structured-dictionary-mismatch formulation to estimate the frequency-grid-mismatch and recover the sparsity of the NBI. The block orthogonal matching pursuit (B-OMP) algorithm is proposed to solve the formulated optimization problem because of its reduced computational complexity. Simulation results demonstrate the merits of the proposed approach.
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