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The main disadvantage of orthogonal frequency division multiplexing (OFDM) systems is the high time-domain peak-to-average power ratio (PAPR) that limits transmitter power efficiency. Partial transmit sequence (PTS) technique can improve the PAPR statistics of an OFDM signal significantly. However the PTS technique requires an exhaustive search over all combinations of allowed phase factors, and the...
Partial transmit sequence (PTS) is an effective technique to reduce the peak-to-average power ratio (PAPR) for orthogonal frequency division multiplexing (OFDM) transmitter. However, selecting the optimal parameters for the PTS is very complex since it requires an exhaustive search of all possible weighting factors whose number grows exponentially with the number of subblocks. An improved particle...
PTS is highly efficient in peak-to-average power ratio (PAPR) reduction of OFDM systems, but the considerable computational complexity for the required search through a high-dimensional vector space is potential problem for a practical implementation. In this paper, we formulate the search problem of PTS as a combinatorial optimization (CO) problem, then propose an algorithm based on improved discrete...
This paper is concerned with the problem of computing a discrete-coefficient approximation to a digital filter. In contrast to earlier works that have approached this problem using standard combinatorial optimization tools, we take a geometric approach. We define a Riemannian manifold, arising from the difference in frequency response between the two systems of interest, on which we design efficient...
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