A novel selected mapping technique for PAPR reduction in OFDM systems

Goff, S.Y. Le; Khoo, Boon Kien; Tsimenidis, Charalampos C.; Sharif, B.S.

doi:10.1109/tcomm.2008.070021

Cited by 70 publications

(24 citation statements)

References 12 publications

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“…Side information is transmitted to the receiver having information about these data vectors. This extra information is an overhead to the channel which reduces the overall data rate [18]. Figure 9 shows the block diagram of selective mapping (SLM) technique.…”

Section: Selective Mapping Methodsmentioning

confidence: 99%

PAPR Reduction for Improved Efficiency of OFDM Modulation for Next Generation Communication Systems

Yadav¹,

Bera²

2016

IJECE

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Highly linear power amplifiers are required for transferring large amount of data for future communication. Orthogonal frequency division multiplexing (OFDM) provides high data rate transmission capability with robustness to radio channel impairments. It has been widely accepted for future communication for different services. But, it suffers from high value of peakto-average power ratio (PAPR). High value of PAPR drives high power amplifiers in saturation and causes it to operate in the nonlinear region. In this paper, comparative study of four different PAPR reduction techniques: clipping and filtering (CF), selective mapping method (SLM), partial transmit sequence (PTS) and DFT-spread technique have been done. All rights reserved. Corresponding Author:Shatrughna Prasad Yadav, Electrical and Electronics Engineering Department, Indus University, Ahmedabad, Gujarat, India. Email: spyadav68@gmail.com INTRODUCTIONThe future generation communication requires high data rate. But dealing with the high data rate in an unpredictable wireless channel is a difficult task. In order to exchange larger amount of information highly linear power amplifiers are required. With the application of orthogonal frequency division multiplexing (OFDM) power amplifier nonlinearities becomes more vulnerable owing to their high peak to average power ratio (PAPR) caused due to large fluctuations in their signal envelope. OFDM is desirable because of several advantages associated with it, such as, tolerance to inter-symbol interference, good spectral efficiency, best performance of frequency selective fading in multipath environment, robustness to channel impairments etc. OFDM is efficiently used to combat the unpredictability of wireless channel and provide high data rate communications [1]. When compared with traditional communication systems, it has several advantages over it. It turns the frequency-selective fading channel into a flat fading channel and hence uses simple receiver. It is spectrally efficient and is ideal for multimedia communication systems. On the other hand, it is sensitive to timing and frequency synchronization errors and has high value of PAPR [2].OFDM systems has many applications and are widely used in high-bit-rate digital subscriber lines (HDSL), digital audio broadcasting (DAB), digital video broadcasting (DVB) along with high-definition television (HDTV), terrestrial broadcasting, etc. It is considered as a better candidate for the future generation communication systems [3]. In the OFDM transmitter the digitally mapped 4-QAM signal is

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Section: Selective Mapping Methodsmentioning

confidence: 99%

PAPR Reduction for Improved Efficiency of OFDM Modulation for Next Generation Communication Systems

Yadav¹,

Bera²

2016

IJECE

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“…A block representation of an OFDM system [3] is shown in Fig 1. An OFDM system starts with the input of data stream from the communication device. The input data stream is in binary format "0" and "1".…”

Section: System Modelmentioning

confidence: 99%

“…Several techniques are available for reducing PAPR among them which are commonly used for the practical is given in [3]- [6]. Inter carrier interference (ICI) is overcome by orthogonal signals, placing the modulated carriers closely increases the spectral efficiency of the OFDM system [6].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Clipping for PAPR Reduction in OFDM

Nagalikar¹,

Khot²

2017

IJERA

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A new Technique "Adaptive Clipping" is introduced to reduce the Peak to Average Power Ratio (PAPR) of OFDM system efficiently for wireless applications. In this technique, the threshold for clipping the signal is decided according to the peak size and number of peaks in the OFDM burst signal. A comparison is done between selective clipping and adaptive clipping and the results are shown in terms of Bit error rate (BER) and PAPR. Adaptive clipping offers nearly half a dB reduction in PAPR compared to selective clipping. With proposed adaptive clipping, PAPR of 3 dB is obtained with BER of 10 -4 . For a particular set of signals where there are large number of peak variations, adaptive clipping is more efficient in terms of BER compared to selective clipping. The simulation of adaptive clipping is done with the MATLAB software and the BER is plotted. An IEEE 806.11 standard is used for OFDM signal Transmission.

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“…The major drawback of SLM method is that it is more computational complex and less bandwidth efficient (side information is required). Therefore, a lot of work has been suggested as a modified SLM to reduce the computational complexity [94][95] and to reduce or to remove the side information transmitted [96][97].…”

Section: Probabilistic (Scrambling) Techniquesmentioning

confidence: 99%