Multicarrier modulations have become broadened and Orthogonal Frequency Division Multiplexing (OFDM) has been widely implemented in high speed digital modulations. OFDM is a multicarrier transmission technique which divides the available spectrum into many carriers, each one being modulated by a low rate data stream. One major disadvantages of OFDM is that the time domain OFDM signal which is a...

The mitigation of nonlinear distortion caused by power amplifiers (PA) in Orthogonal Frequency Division Multiplexing (OFDM) systems is an essential issue to enable energy efficient operation. In this work we proposed a new algorithm for receiver-based clipping estimation in OFDM systems that combines the Iterative Hard Thresholding method introduced in [5] with the weighting corresponding to th...

The high peak to average power ratio (PAPR) of the transmit signal is a major drawback in orthogonal frequency division multiplexing (OFDM) systems. A high PAPR can lead to saturation in the power amplifier and consequently distorts the signal. In this paper, we propose a method based on compressed sensing (CS) to recover nonlinearly distorted OFDM signals. The method exploits pilot tones inser...

An OFDM system is combined with multiple-input multiple-output (MIMO) in order to increase the diversity gain and system capacity over the time variant frequency-selective channels. However, a major drawback of MIMO-OFDM system is that the transmitted signals on different antennas might exhibit high peak-to-average power ratio (PAPR).In this paper, we present a PAPR analysis reduction of space-...

In order to determine aqueous extract effects of cool-season turfgrass mixture clipping on germination and seedling growth of four weed species, laboratory and outdoor pot experiments were done at the experimental laboratory and greenhouse of the Doroud Parks and Landscape Organization, located in Doroud, Lorestan, Iran. The first factor was the concentration of sport turfgrass clipping extract...

background and purpose: tinea capitis and tinea unguium are regarded as global public health concerns. the purpose of the present study was to identify the etiological agents of tinea capitis and tinea unguium in patients, referring to the central laboratory of yazd university of medical sciences, yazd, iran. materials and methods: this study was conducted during 2014-2015. skin scraping, scalp...

We propose clipping methods that are capable of using complex geometries for volume clipping. The clipping tests exploit per-fragment operations on the graphics hardware to achieve high frame rates. In combination with texture-based volume rendering, these techniques enable the user to interactively select and explore regions of the data set. We present depth-based clipping techniques that anal...

In this research paper, a variation of clipping ,RCF and tone reservation/injection techniques are examined with proper analysis of clipping ratio (CR) and depth factor(Alpha) in fine tuning of a PAPR reducing system. By exploiting the sparsity of clipping events in the time domain relative to predefined clipping threshold and generate the OFDM bins of the incoming broadband channel into narrow...

in this experiment 144 hy-line (w36) laying hens, 65 to 77 weeks of age were separated into 4 treatments with 3 replicates (12 birds per replicate) in a completely randomized design experiment. the grass clipping wastes incorporated into a complete formulated layer diet, consisting on a corn and soybean based diet, were 0, 1.5, 3.0 and 4.5% in 1 to 4 experimental groups. the results showed that...