Real-time sidelobe suppression for OFDM systems using advanced subcarrier weighting

The concept of subcarrier weighting (SW) has been proposed in the literature for sidelobe suppression for OFDM systems. Each OFDM subcarrier is multiplied with a real-valued weight that is determined in order not to interfere with adjacent users. The problem with the SW technique is involving a very complex optimization that has to be performed for each OFDM symbol which limits the suitability for real-time applications. In this paper, we propose a heuristic approach called advanced subcarrier weighting (ASW). It can achieve considerable sidelobe suppression while requiring significantly less computational resources than the optimal solution. Simulation results show that the performance of the proposed algorithm can be close to the optimal performance. Moreover, the proposed ASW algorithm is implemented in a software defined radio. Implementation results prove that it can be introduced for real-time transmissions.