نتایج جستجو برای: papr reduction methods
تعداد نتایج: 2263048 فیلتر نتایج به سال:
In this paper, an efficient method for minimizing the high Peak to Average Power Ratio (PAPR), based on Clipping and Differential Scaling, in Orthogonal Frequency Division Multiplexing (OFDM) systems is proposed. In this technique, the amplitude of complex OFDM signal is clipped and then scaled in such a way so that the PAPR is reduced without causing much degradation in Bit Error Rate (BER). C...
One of the challenging issues in today’s OFDM system which is MCM is to handle high PAPR of the transmitted OFDM signals. The OFDM receiver detection efficiency is very much sensitive to nonlinear devices used in signal processing such as HPA and DAC. The criterion of PAPR reduction is to find methodology which can reduce PAPR drastically and at the same time it can keep reasonably good perform...
OFDM (Orthogonal Frequency Division Multiplexing) technique has been widely adopted in many wireless communication systems due to its high data-rate transmission ability and robustness to the multipath fading channel. One major drawback of the OFDM signal is the high peak-toaverage power ratio (PAPR) problem. The high PAPR results in the in-band distortion and out-of-band radiation when the OFD...
PAPR is a generic problem in OFDM system. Loss of data at transmitter and receiver end is an inherit part of communication system. Different techniques have been proposed to solve this PAPR problem based on artificial intelligence. A PAPR reduction way for OFDM system is proposed, inspired by constant modulus property known as weight pattern hybrid continuous modulus algorithm. This coupled wit...
Abstract—Orthogonal frequency division multiplexing (OFDM) is a promising broadband transmission technique. However, OFDM has a drawback of large peak-to-average power ratio (PAPR), which is proportional to the number of subcarriers. A PAPR reduction scheme called tone injection (TI) was proposed that exploits the property of a nonlinear modulo function. The TI is equivalent to the one that sup...
This paper proposes a novel way to compact the constellation points in QAM modulation schemes and exploits this compaction to reduce the peak to average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. The compaction is accomplished using one dimensional product code (PC). Significant PAPR reduction is achieved by carefully mapping the points in the compact versi...
This work considers the problem of Peak to Average Power Ratio (PAPR) reduction in an Orthogonal Frequency Division Multiplexing system. We design a cubic constellation, called Hadamard constellation, whose boundary is along the bases defined by the Hadamard matrix in the transform domain and then we further reduce the PAPR by applying the Selective Mapping technique. The encoding algorithm is ...
This paper contains the Hadamard Transform in the SLM for the reduction of high peak to average power ratio (PAPR) in MIMOOFDM systems. In this technique, the input sequence is multiplied by a set of phase rotation vectors respectively and then applies the Hadamard Transform to the each resulting sequence based on SFBC. After that perform the Inverse Fast Fourier Transform in order to get the t...
One of the main disadvantages of Orthogonal Frequency Division Multiplexing (OFDM) is its high peak-toaverage power ratio (PAPR). As the simplest approach to reducing the PAPR, Clipping based Active Contellation Extension (CB-ACE) exhibits good practicability, and the repeated clipping-and-filtering (RCF) algorithm proposed by Jean Armstrong provides a good performance in PAPR reduction and out...
The 3rd generation partnership project (3GPP) long term evolution (LTE) standard uses single carrier frequency division multiple access (SCFDMA), scheme for the uplink transmissions and orthogonal frequency division multiplexing access (OFDMA) in downlink. SCFDMA makes use of single carrier modulation and frequency domain equalization, it is a technique that has similar performance and essentia...
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