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—Partial transmit sequences (PTS) is one of the attractive techniques to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) system. As conventional PTS technique requires an exhaustive searching over all the combinations of the given phase factors, which results in the computational complexity increases(More)
For the sake of anywhere and anytime connectivity in the next generation networks, different wireless access networks are integrated to form a heterogeneous network and the mobile stations are multi-mode multi-interface. It is a very significant research to find out how to serve more mobile stations as many as possible and to increase the overall(More)
In this paper, subcarrier and power allocation problems for multiuser multi-antenna OFDM systems are investigated. With the goal of minimizing the total transmit power required and guaranteeing each user's QoS requirements, a low complexity dynamic resource allocation scheme is proposed. It involves adaptive subcarrier assignment, adaptive power control and(More)
— In this paper, we provide the design criteria of the nonlinear companding transforms for reduction in peak-to-average power ratio (PAPR) of multi-carrier modulation (MCM) signals, which can enable the original MCM signals to be transformed into the desirable distribution. As examples, some novel nonlinear companding transforms have been proposed to(More)
In digital images, impulse noise (such as salt and pepper noise) detection and removal is an important process as the images are corrupted by those noise because of transmission and acquisition. The main aim of the noise removal is to suppress the noise when preserving the edge information. The median filter and its derivatives are usually used for this(More)