A HYBRID PRECODING TECHNIQUE FOR REDUCING BOTH PAPR AND SIDELOBE POWER IN COGNITIVE RADIO NETWORKS

Orthogonal Frequency Division Multiplexing (OFDM) is a recognized transmission technique for Cognitive Radio (CR) networks, which is called non-contiguous OFDM (NC-OFDM). While this technique has two major drawbacks, Out OF Band (OOB) leakage due to high spectral sidelobe and high Peak to Average Power Ratio (PAPR), which cause interference with Primary Users (PU). Many solutions were proposed for solving either of these problems individually or together. In this paper, a hybrid precoding technique for reducing both PAPR and sidelobe power is proposed. This technique is based on using Zadoff-Chu sequences with Singular Value Decomposition (SVD) optimization method to minimize the power interference with PU. Simulation results cover the PAPR, sidelobe reduction, and Bit Error Rate (BER) for the proposed technique.

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