Results 241 to 250 of about 249,640 (270)

Calculation of peak-to-average power ratio in DVB-T

47th International Symposium ELMAR, 2005., 2005
Extremely high peak power values are the major problem in digital terrestrial television (DVB-T). They are caused by multi-carrier modulation COFDM (Coded Orthogonal Frequency Division Multiplex). This paper contains analysis of this problem from the aspect of theoretical peak power maximum and statistical analysis of the problem where DVB-T parameters
Perčin, Domagoj, Kezan, Zoran, Zovko-Cihlar, Branka   +2 more
openaire   +2 more sources

A Gradient Based Peak-to-Average Power Ratio Reduction Method

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007
One promising approach to peak to average power ratio (PAPR) reduction for orthogonal frequency division multiple access (OFDMA) is the use of reserved tones, which are modulated so as to reduce the PAPR. One problem with this approach is the computationally efficient determination of reserved tone signals that best reduce the PAPR.
Jayant Baliga, Alex Grant, Graeme Woodward, Adriel Kind   +3 more
openaire   +2 more sources

DMT signals with low peak-to-average power ratio

Proceedings IEEE International Symposium on Computers and Communications (Cat. No.PR00250), 2003
This contribution proposes a new family of methods to reduce the peak-to-average power ratio (PAR) in discrete multi-tone (DMT) and orthogonal frequency division multiplexing (OFDM) systems. This method avoids the use of extra inverse fast Fourier transformations (IFFT) as were used in some previously published techniques, but instead is based on ...
Zekri, Mohamed, Boets, Patrick, Van Biesen, Leo   +2 more
openaire   +2 more sources

On minimum peak-to-average power ratio spectral factorization

2011 8th International Workshop on Multi-Carrier Systems & Solutions, 2011
The design of a filter with a given autocorrelation function — or in other words, the factorization of an autocorrelation sequence — is a standard task in digital communications. This paper demonstrates that different spectral factors have a different impact on finite-support random sequences in terms of peak-to-average power ratio.
Thomas Magesacher, John M. Cioffi
openaire   +1 more source

Peak to average power ratio reduction of OFDM system

International Conference on Information Communication and Embedded Systems (ICICES2014), 2014
Orthogonal frequency division multiplexing (OFDM) is a modulation technique that is suitable for high data rate communication. But the main drawback of OFDM is its high peak to average power ratio (PAPR), which can lead to nonlinear distortions in the power amplifiers at the transmitter side.
T. Gayathri, K. Bavithra
openaire   +1 more source

Statistical Peak to Average Power Ratio Bound

International Journal on Communications Antenna and Propagation (IRECAP), 2015
Central limit theorem, modern extreme value theory and the theory that the discrete orthogonal frequency division multiplexing signals converge weakly to a Gaussian random process are generally employed to derive the best approximation of peak-to-average power ratio distributions of discrete-time and continuous-time signals. In this paper, we arrive at
openaire   +1 more source

Peak-to-average power ratio analysis of LDM signals

2015 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, 2015
Layered Division Multiplexing (LDM) is as a new technical solution for multiplexing different services over the same RF channel. it has already been accepted as a baseline technology for the new generation ATSC 3.0 digital terrestrial television (DTT) standard.
J. Montalban, J. Barrueco, I. Angulo, L. Zhang, Y. Wu, W. Li, H-M. Kim, S-I. Park, J-Y. Lee   +8 more
openaire   +1 more source

Peak-to-Average Power Ratio in WFMT Systems

2006 International Conference on Wireless Communications, Networking and Mobile Computing, 2006
This paper discuses the peak to average power ratio (PAR) for the signal of a novel wavelet based filtered multi-tone (WFMT) modulation. The wavelet based filtered multi-tone (WFMT) modulation was developed as an alternative line code for xDSL system and represents future extension of OFDM/DMT technologies.
openaire   +1 more source

Band-shaped analog peak-to-average power ratio reduction

2015 IEEE Radio and Wireless Symposium (RWS), 2015
This paper demonstrates a band-shaped all-analog peak-to-average power ratio (PAR) reduction. It uses fast and accurate analog components modeled after circuits implemented in IBM 5PAe 0.35-µm SiGe BiCMOS process. The architecture is designed to precisely clip the RF signal at a certain level, but also employs a clipping function shaping technique to ...
Mikyung Cho, J. Stevenson Kenney
openaire   +1 more source

Assessing peak-to-average power ratios for communications applications

IEEE MILCOM 2004. Military Communications Conference, 2004., 2005
High peak-to-average ratio (PAR) is a significant drawback for orthogonal frequency division multiplexing (OFDM). Accordingly, many authors have proposed different PAR reduction methods that rely on different trade-offs. It is important to quantify the effectiveness of an individual PAR reduction method.
R.J. Baxley, G.T. Zhou
openaire   +1 more source