Results 261 to 270 of about 261,383 (301)

On minimizing the peak-to-average power ratio for the sum of N sinusoids

IEEE Transactions on Communications, 1993
A new derivation is presented of a previously known relationship for phasing N equal-amplitude, equally spaced (in frequency) sinusoids so that the peak-to-average power ratio of their sum is 2.6 dB. The method of derivation provides intuitive insight into why this result is possible, and shows that the 2.6 dB figure is obtained independently of N as ...
Darrell R. Gimlin, Charles R. Patisaul
openaire   +2 more sources

On the links between peak to average power ratio for conventional RF power amplifiers and peak to average duration ratio for switching mode power amplifiers

2011 XXXth URSI General Assembly and Scientific Symposium, 2011
For conventional RF power amplifier (PA), the power efficiency depends on the peak to average power ratio (PAPR) of the input signal, or more precisely on the statistical distribution of the input signal amplitude. In this paper we show that, in a similar way, the power efficiency of switching mode PA driven by ΣΔ or PWM signals depends on the ...
Baudoin, Geneviève, Diet, Antoine, Villegas, Martine   +2 more
openaire   +2 more sources

On the peak-to-average power ratio of M-sequences

The 22nd Convention on Electrical and Electronics Engineers in Israel, 2002., 2003
The paper derives an expression for the peak-to-average power ratio (more exactly the peak-to-mean envelope power ratio) of an M-sequence. The derived parameter is of crucial importance if M-sequences are used in multi-carrier communication systems (e.g. OFDM).
I. Alrod, S. Litsyn
openaire   +1 more source

Reducing the peak-to-average power ratio of OFDM

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 2002
The distribution of the peak-to-average power (PAP) ratio of an OFDM signal is derived, showing that large PAP ratios only occur very infrequently. Because of this, PAP reducing techniques which distort the signal can be quite effective, since only a small fraction of the OFDM signal has to be distorted.
R. van Nee, A. de Wild
openaire   +1 more source

Peak-To-Average Power Ratio Reduction by Zero Forcing Peaks

2006 IEEE International Multitopic Conference, 2006
One of main drawback of orthogonal frequency division multiplexing (OFDM) is high peak to average power ratio (PAPR) which causes non-linearity at power amplifier stage. In this paper a new technique for reducing PAPR of the OFDM signal is implemented. This method does not spread the OFDM signal bandwidth and no additional IFFT has to be performed thus
Seema Khalid, Syed Ismail Shah
openaire   +1 more source

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 J. Grant, Graeme Woodward, Adriel Kind   +3 more
openaire   +1 more source

Signal Classification Using a Peak-to-Average Power Ratio Statistic

2009 IEEE International Conference on Communications, 2009
This paper addresses signal classification based on an average power statistic for peak-to-average-power ratio (PAR) reduced signals. Specifically, it is assumed that either a QAM or a Complex Gaussian finite-length symbol is transmitted in a noisy, peak-limited channel with known peak power. The goal is determine the whether an uninformed receiver can
Robert J. Baxley, Brett T. Walkenhorst, G. Tong Zhou   +2 more
openaire   +1 more source

Peak-to-Average Power Ratio Analysis of PCC-OFDM Signals

2009 IEEE 70th Vehicular Technology Conference Fall, 2009
In this paper, a statistical analysis of the peak-to- average power ratio (PAPR) of Polynomial cancellation coded OFDM (PCC-OFDM) signals is presented. PCC-OFDM has the good performance of compressing intercarrier interference (ICI) at the cost of high PAPR.
Qi Liu, Zheng Zhou 0001, Weixia Zou, Shaohua Kan, Yabin Ye   +4 more
openaire   +1 more source

Peak-to-Average Power Ratio Analysis for NC-OFDM Transmissions

2007 IEEE 66th Vehicular Technology Conference, 2007
In this paper, we present a statistical analysis of the peak-to-average power ratio (PAPR) for non-contiguous orthogonal frequency division multiplexing (NC-OFDM) signals. When studying contiguous OFDM signals, most PAPR analysis techniques assume the symbols to be identically and independently distributed (i.i.d.). However, in an NC-OFDM transmission,
Rakesh Rajbanshi, Alexander M. Wyglinski, Gary J. Minden   +2 more
openaire   +1 more source

On the computation and reduction of the peak-to-average power ratio in multicarrier communications

IEEE Transactions on Communications, 2000
For any code C defined over an equal energy constellation, it is first shown that at any time instance, the problem of determining codewords of C with high peak-to-average power ratios (PAPR) in a multicarrier communication system is intimately related to the problem of minimum-distance decoding of C.
Vahid Tarokh, Hamid Jafarkhani
openaire   +1 more source