Partial Transmit Sequences (PTS) seems to be attractive for Peak to Average Power Ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) system, since it obtains better PAPR property by modifying OFDM signals without distortion. Meanwhile it also shows the potential to be utilized in STBC MIMO-OFDM system. The PTS method can reduce the PAPR by controlling the multiplied wei...

This paper presents an orthogonal frequency division multiplexing (OFDM) system, which through the use of sub-optimal PTS combined with a preset threshold, achieves low computational complexity to find optimum weighting factors. A specific bit in weighting factor that leads to a smaller peak-to-average power ratio ( ) is identified from the sub-optimum method. And a specific threshold, which fo...

The Power allocation in Orthogonal Frequency Division Multiplexing (OFDM)-based cognitive radio networks is designed by gradient based method. The gradient based method in which the power allocated between subcarriers by considering the interference constraint, capacity of CR users and channel gain. Utilize the gradient based descent approach to allocate power to subcarriers in Cognitive Radio ...

Ringing and noise amplification are the most dominant artifacts in image deconvolution. These artifacts can be reduced by introducing image prior into the deconvolution process. A regularization weighting factor can control strength of the regularization. Ringing and noise can be reduced significantly with the strong weighting factor, but details can be lost. We propose a nonblind image deconvo...

In [I], a method was given for optimal Hankel-norm approximation with frequency weighting. In a broad sense, this method stands in the same relation to frequency-weighted balanced approximation [2] as unweighted optimal Hankel-norm approximation stands in relation to unweighted balanced approximation, see, e.g. [3]. No bounds were given in [I] on the frequency-domain error associated with frequ...

antenna structures with low side lobe levels are normally the main goal during antenna design. in this paper, a new method for reduction of radiation pattern side lobe level in phased array antenna with uniform and non-uniform weighting is presented. in this method, by changing the array elements weight or adding several elements, such as slc technique, the pattern with low side lobe level can ...

today, in the rangeland management science and determination of rangecapacity, accurate and true information about range production is crucial. in fact, rangeproduction is considered as a basis for range management. the aim of this study was tocompare different methods for the estimation of forage production with four samplingmethods in the rangelands of kurdistan province, iran. the sampling m...