Orthogonal Frequency Division Multiplexing with Offset Quadrature Amplitude Modulation (OFDM/OQAM) signal has high peak-to-average power ratio (PAPR) problem. It not only affects the distortion in High Power Amplifier (HPA) but also results bit error (BER) degradation. In this paper an improved algorithm based on Clipping and Compressed Sensing (CS) is proposed. The transmitter uses clipping to...

Orthogonal Frequency Division Multiplexing (OFDM) has been used in many advanced wireless communication systems due to its high spectral efficiency and robustness to frequency selective fading channels. However, the major concern with OFDM system is the high peak-to-average power ratio (PAPR) of the transmitted signal. Some of the popular techniques used for PAPR reduction in OFDM system are co...

Multi-layer interleave-division multiple access (IDM/IDMA) inherently exhibits a large peak-to-average power ratio (PAPR). Correspondingly, the power amplifier has to operate with a large back-off, which reduces the power efficiency. Clipping at the transmitter side is an efficient and simple method to reduce the PAPR, but causes nonlinear in-band distortions and sometimes out-of-band radiation...

one of the problems associated with adaptive fir filters in the identification of systems with long impulse responses, is their excessive computational complexity. recently a new kind of adaptive filters, based on three-level clipping of the input signal has been presented for reduction of their computational complexity. in this paper, a theoretical analysis of the steady-state misalignment of ...

In an Orthogonal Frequency Division Multiplexing (OFDM) systems, the Peak to Average power Ratio (PAR) is high. The clipping signal scheme is a useful and simple method to reduce the PAR. However, it introduces additional noise that degrades the systems performance. We propose an oversampling scheme to deal with the received signal in order to reduce the clipping noise by using finite impulse r...

In this paper, we propose an efficient and stable algorithm for finding the ray-surface intersections. Newton’s method and Bézier clipping are adapted to form the core of our algorithm. Ray coherence is used to find starting points for Newton iteration. We introduce an obstruction detection technique to verify whether an intersection point found by using Newton’s method is the closest one. When...

Background: It is well known that the majority of good grade (WFNS I and II) patients who undergo microsurgical clipping achieve a favorable outcome, but still a number of patients who are independent before surgery face unfavorable outcomes signifying the impact of microsurgical clipping. The aim of this study was to quantify the risk of dependency in patients who had no previous neurological ...