Results 151 to 160 of about 256,030 (190)
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Band-shaped analog peak-to-average power ratio reduction
2015 IEEE Radio and Wireless Symposium (RWS), 2015This 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
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Assessing peak-to-average power ratios for communications applications
IEEE MILCOM 2004. Military Communications Conference, 2004., 2005High 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
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Peak-to-Average Power Ratio Reduction in MIMO OFDM
2007 IEEE International Conference on Communications, 2007Peak-to-average power ratio (PAR) reduction in OFDM using antenna arrays (MIMO OFDM) is considered. In particular, generalizations of selected mapping (SLM) recently proposed in literature, are studied, and a new version, we call it directed SLM (dSLM), is introduced.
R. F. H. Fischer, M. Hoch
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Peak to average power ratio in WLAN-OFDM system
4th National Conference of Telecommunication Technology, 2003. NCTT 2003 Proceedings., 2003Orthogonal frequency division multiplexing (OFDM) is one of the multicarrier modulation techniques that can reduce the ISI and delay spread of signal. This technique also allows subchannel to overlap. The orthogonality of the subchannels reduce the bandwidth (BW) and increase the spectral efficiency of system.
N. Ngajikin, N. Fisal, S.K. Yusof
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Reducing the peak-to-average power ratio of OFDM
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 2002The 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
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Peak-to-average power ratio in high-order OFDM
IEEE Transactions on Communications, 2001Summary: The problem of Peak-to-Average Power Ratio (PAPR) of high-order Orthogonal Frequency-Division Modulation (OFDM) is considered. Using results on level crossing of random processes, an upper bound on the probability that the PAPR of an OFDM signal will exceed a given value is derived.
Dinur, Nati, Wulich, Dov
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Peak to Average Power Ratio Reduction of OFDM Signal
2005 Annual IEEE India Conference - Indicon, 2006High Peak to Average Power Ratio (PAPR) of the transmitted signal is a major drawback of Orthogonal Frequency Division Multiplexing (OFDM). In Selective Mapping (SLM) technique, input data is multiplied with different number of phase sequences prior to OFDM modulation. The OFDM sequence with lowest PAPR is selected and transmitted.
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Analysis of the Peak-To-Average Power Ratio for OFDM/OQAM
2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications, 2006OFDM/OQAM is now a recognized alternative to conventional OFDM for the transmission of signals over multipath fading channels. Indeed with OFDM/OQAM an appropriate pulse-shaping can be introduced to fight against time and frequency dispersion. This paper focuses on a theoretical and experimental analysis of the peak-to-average power ratio (PAPR) for ...
Skrzypczack, Alexandre +2 more
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Peak to Average Power Ratio (PAPR) Reduction in OFDM System
2006 International RF and Microwave Conference, 2006Orthogonal Frequency Division Multiplexing (OFDM) is a special form of multi-carrier modulation which is robust against the multipath effect, Intersymbol Interference (ISI) and high spectral efficiency. However, Peak to Average Power Ratio (PAPR) is a major drawback in the system since this leads to the distortion problem in the linear devices such as ...
N. N. Nik Abd Malik +3 more
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On signals with very high peak-to-average power ratio
International Symposium onInformation Theory, 2004. ISIT 2004. Proceedings., 2004This paper address the problem of classification of BPSK-modulated multicarrier signals with the peak-to-average power ratio (PAPR) exceeding 3/4 of the maximal possible value. By providing a simple characterization of such signals, an upper bound on their number are derived and propose a simple sufficient condition for the signals to have low PAPR ...
G. Freiman, S. Litsyn, A. Yudin
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