Results 181 to 190 of about 9,490 (213)

Peak to Average Power Ratio (PAPR) reduction in OFDM for a WLAN network using SLM technique

2011 3rd International Conference on Electronics Computer Technology, 2011
Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. OFDM modulation schemes offer many advantages for multicarrier transmission at high data rates over time dispersive channels, particularly in mobile applications.
Reena Chackochan, Himanshu Soni
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Non-linear companding scheme for peak-to-average power ratio (PAPR) reduction in generalized frequency division multiplexing

Journal of Optical Communications, 2020
Abstract Due to the evolution of mobile phone technology which enables the use of Internet, the demand for data rates has increased tremendously. Therefore, current 4G-LTE (long-term evolution) technology needs to be replaced in near future. Hence, currently possible solutions for 5G technology are heavily investigated.
Shiv Om Tiwari, Rajeev Paulus
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Reducing peak-to-average power ratio (PAPR) using partial transmit sequence in OFDM systems

7th International Multi Topic Conference, 2003. INMIC 2003., 2005
OFDM is a multicarrier system supporting high data rate transmission and generally requires no equalization at the receiver, making it simple and efficient. However, a drawback of this system is the large peak-to-average-power ratio (PAPR) of the transmit signal, which makes its straightforward implementation quite costly.
A. Latif, N.D. Gohar
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A Hybrid Method Based on SLM and Exponential Companding Technique to Reduce the Peak to Average Power Ratio (PAPR) in an OFDM System

2021 International Conference on Automation, Control and Mechatronics for Industry 4.0 (ACMI), 2021
Despite being the most auspicious technique for existing as well as next-generation wireless communication system having wide application and huge advantages, the overall system performance of orthogonal frequency division multiplexing (OFDM) deteriorates due to high peak to average power ratio (PAPR).
Tasnova Nasrin Munni, Md Hossam-E-Haider
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Highly Efficient Transmitter for High Peak to Average Power Ratio (PAPR) Waveforms

2011
Abstract : Aethercomm has shown that a high efficiency power amplifier can be developed to enhance efficiency over specific bands over frequencies ranging between 400MHz through 4000MHz with up to 67% efficiencies. These frequencies can be extended down to 30MHz and offer consistent performances by adding additional band functionality allowing support ...
Conni King, Alex Besprozvanny
openaire   +1 more source

C2. Progressive Image Transmission over OFDM System with Minimum Peak-to-Average Power Ratio (PAPR)

2013 30th National Radio Science Conference (NRSC), 2013
A modified Orthogonal Frequency Division MuItiplexing (OFDM) system for robust progressive image transmission is proposed in this paper. A joint sOUfce-channel coder (JSC C ) is employed in the modified OFDM system. The set partitioning hierarchical trees (SPTHT) used as SOUfce code, and The Low-Density Parity-C heck (LDPC ) used as a channel coder ...
Usama S. Mohammed, Osama A. Omer, Ahmed S. A. Mubarak   +2 more
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Performance Analysis of Peak to Average Power Ratio (PAPR) Reduction Techniques in OFDM System for Different Modulation Schemes

2018 4th International Conference on Electrical Engineering and Information & Communication Technology (iCEEiCT), 2018
With the increasing demand for high power efficiency, robustness to multipath delay spread and high transmission speed, OFDM has become one of the most promising techniques for next generation wireless communication systems. However, high peak to average power ratio is a major limitation of OFDM system which makes the overall system less effective ...
Tasnova Nasrin Munni, Md Hossam-E-Haider
openaire   +1 more source

Peak-to-Average Power Ratio (PAPR) Reduction Using Combination of Precoding and Companding Techniques for VLC OFDM Systems

2019 TEQIP III Sponsored International Conference on Microwave Integrated Circuits, Photonics and Wireless Networks (IMICPW), 2019
In VLC system, increase in data rate leads to inter symbol interference (ISI). It is desired to reduce the high ISI using suitable modulation technique for high rate data traffic. Orthogonal frequency division multiplexing (OFDM) is an efficient modulation format to alleviate ISI effect.
Nishant Sharan, S.K Ghorai, Ajit Kumar
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Peak to average power ratio (PAPR) reduction in orthogonal frequency division multiplexing using pilot assisted technique

2016 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET), 2016
This paper investigates a novel technique called as pilot assisted techniques for PAPR reduction in orthogonal frequency division multiplexing (OFDM). A pilot assisted technique has been implemented in MATLAB for AWGN and Rayleigh channel. PAPR has been found out for AWGN and Rayleigh channel. Also the Bit error rate (BER) vs frame for each channel has
Bhalchandra Madhao Hardas, Sanjay B. Pokle   +1 more
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Reduction of the peak to average power ratio (PAPR) for DVB systems using Gaussian based tone reservation and unused tones

China-Ireland International Conference on Information and Communications Technologies (CIICT 2007), 2007
One of the major drawbacks of OFDM is its high peak-to-average power ratio (PAPR) which can result in poor power efficiency and serious distortion in the transmitter amplifier. Tone reservation (TR) is a technique designed to combat this problem by reserving a number of sub-carriers (tones) in the frequency domain to generate a cancellation signal in ...
C. Devlin, null Anding Zhu, T.J. Brazil
openaire   +1 more source