A Simplified Suboptimal Algorithm for Tone Reservation OFDM

A gradient algorithm has been used in the tone reservation technique for peak to average power ratio (PAPR) reduction. This provides a good approximation to the optimal solution with lower complexity. This technique requires that a kernel signal be computed and iteratively shifted in the time-domain to the peak locations to reduce the PAPR. The kernel signal should be updated dynamically for the best performance in time varying channels, which increases the computational complexity. In this paper, we propose a low complexity gradient algorithm for computing the peak reduction kernels. This approach is more efficient than the previous algorithm, and provides better PAPR performance.