The Experts below are selected from a list of 316950 Experts worldwide ranked by ideXlab platform
A E Jones - One of the best experts on this subject based on the ideXlab platform.
-
minimisation of the peak to mean envelope Power Ratio of multicarrier transmission schemes by block coding
Vehicular Technology Conference, 1995Co-Authors: T A Wilkinson, A E JonesAbstract:A block coding scheme for the reduction of the peak to mean envelope Power Ratio of multicarrier transmission schemes is described. The principle of the scheme is illustrated with the specific example of a four carrier signal. The potential of the technique is investigated and it is shown that the application of a 1/2 rate code could typically result in a peak to mean envelope Power Ratio of around 3 dB. The development of the technique in terms of the selection of suitable sets of code words based on Shapiro-Rudin sequences, Golay complementary sequences and other larger sets of code words is investigated. However, it is shown that none of these code sets are ideal.
-
block coding scheme for reduction of peak to mean envelope Power Ratio of multicarrier transmission schemes
Electronics Letters, 1994Co-Authors: A E Jones, T A Wilkinson, S K BartonAbstract:A block coding scheme for the reduction of the peak to mean envelope Power Ratio of multicarrier transmission schemes such as OFDM is proposed. The principle of the scheme is illustrated with the specific example of a four-carrier signal. It is shown that the peak to mean envelope Power Ratio of this signal can be reduced from 6.02 dB to 2.48 dB with a 3/4 rate block code. The application of the block coding principle with flexibility such that the coding rate can be traded against peak to mean envelope Power Ratio is illustrated with the example of an eight-carrier signal.
Dov Wulich - One of the best experts on this subject based on the ideXlab platform.
-
peak to average Power Ratio reduction for filter bank multicarrier modulation using iterative clipping and filtering
IEEE International Conference on Science of Electrical Engineering, 2018Co-Authors: David Levy, Arie Reichman, Dov WulichAbstract:Filter Bank Multi Carrier (FBMC) is considered as promising candidate solution to the air interference problem in the fifth-geneRation communication (5G). Since the performance of multicarrier transmission is affected by peak to average Power Ratio (PAPR) therefore, research on PAPR reduction methods is essential. The paper presents the effect of the simplest method for reduction the PAPR for FBMC modulation by using the iterative clipping and filtering (ICF) method. A significant improvement in PAPR reduction can be obtained with a modest complexity and low degradation in Bit Error Ratio (BER).
-
peak to average Power Ratio in high order ofdm
IEEE Transactions on Communications, 2001Co-Authors: Nati Dinur, Dov WulichAbstract: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. Numerical computations are used to show that this bound is tight for low-pass OFDM systems. The central limit theorem is used to find an asymptotic expression for the bound when the number of carriers N grows to infinity. The central limit theorem is also used to find an asymptotic expression for another bound that is based on the envelope of the OFDM signal, and is tighter for bandpass systems. It is shown that, effectively, the PAPR grows as 2lnN and not linearly with N, and by developing a lower bound on the probability that the PAPR of an OFDM signal will exceed a given value, it is shown that asymptotically most OFDM symbols have a PAPR close to 2lnN. Some approaches to coping with the PAPR problem are discussed in light of the obtained results.
-
peak to average Power Ratio in amplitude clipped high order ofdm
Military Communications Conference, 1998Co-Authors: Nati Dinur, Dov WulichAbstract:One of the main problems of orthogonal frequency division multiplexing (OFDM) is the large peak-to-average Power Ratio (PAPR) of the output signal which demands linear behavior of the system over a large dynamic range. In this paper the performance of amplitude clipped high order OFDM is considered. Using a central limit theorem, the distribution of the OFDM signal is found to be asymptotically Gaussian when the order of the OFDM signal approaches infinity. An expression for the probability that the PAPR of the signal will exceed a given level is found, and using it an upper bound on the BER is derived. It is shown that when the clipping level approaches infinity faster than /spl radic/(ln N), then a zero BER penalty and arbitrarily large peak-to-average Power Ratio gain are asymptotically obtained. It is also shown that use of the asymptotic results for N/spl ges/32 causes a negligible error in practice.
T A Wilkinson - One of the best experts on this subject based on the ideXlab platform.
-
minimisation of the peak to mean envelope Power Ratio of multicarrier transmission schemes by block coding
Vehicular Technology Conference, 1995Co-Authors: T A Wilkinson, A E JonesAbstract:A block coding scheme for the reduction of the peak to mean envelope Power Ratio of multicarrier transmission schemes is described. The principle of the scheme is illustrated with the specific example of a four carrier signal. The potential of the technique is investigated and it is shown that the application of a 1/2 rate code could typically result in a peak to mean envelope Power Ratio of around 3 dB. The development of the technique in terms of the selection of suitable sets of code words based on Shapiro-Rudin sequences, Golay complementary sequences and other larger sets of code words is investigated. However, it is shown that none of these code sets are ideal.
-
block coding scheme for reduction of peak to mean envelope Power Ratio of multicarrier transmission schemes
Electronics Letters, 1994Co-Authors: A E Jones, T A Wilkinson, S K BartonAbstract:A block coding scheme for the reduction of the peak to mean envelope Power Ratio of multicarrier transmission schemes such as OFDM is proposed. The principle of the scheme is illustrated with the specific example of a four-carrier signal. It is shown that the peak to mean envelope Power Ratio of this signal can be reduced from 6.02 dB to 2.48 dB with a 3/4 rate block code. The application of the block coding principle with flexibility such that the coding rate can be traded against peak to mean envelope Power Ratio is illustrated with the example of an eight-carrier signal.
Jae Hong Lee - One of the best experts on this subject based on the ideXlab platform.
-
an overview of peak to average Power Ratio reduction techniques for multicarrier transmission
IEEE Wireless Communications, 2005Co-Authors: Seung Hee Han, Jae Hong LeeAbstract:High peak-to-average Power Ratio of the transmit signal is a major drawback of multicarrier transmission such as OFDM or DMT. This article describes some of the important PAPR reduction techniques for multicarrier transmission including amplitude clipping and filtering, coding, partial transmit sequence, selected mapping, interleaving, tone reservation, tone injection, and active constellation extension. Also, we make some remarks on the criteria for PAPR reduction technique selection and briefly address the problem of PAPR reduction in OFDMA and MIMO-OFDM.
-
peak to average Power Ratio reduction of an ofdm signal by signal set expansion
International Conference on Communications, 2004Co-Authors: Seung Hee Han, Jae Hong LeeAbstract:A major drawback of orthogonal frequency division multiplexing (OFDM) is the high peak-to-average Power Ratio (PAPR) of the transmitted signal. In this paper, we propose a novel technique to reduce PAPR in an OFDM signal. Proposed technique is based on signal set expansion. Each point in the original signal set is associated with two or more points in the expanded signal set. Each symbol in an OFDM data block is mapped into a point among associated points in the expanded signal set so as to achieve PAPR reduction. The proposed technique is very simple and does not require any side information to be transmitted from the transmitter to the receiver.
Tao Jiang - One of the best experts on this subject based on the ideXlab platform.
-
using fountain codes to control the peak to average Power Ratio of ofdm signals
IEEE Transactions on Vehicular Technology, 2010Co-Authors: Tao JiangAbstract:In this paper, we apply fountain codes to control the peak-to-average Power Ratio (PAPR) of orthogonal frequency-division multiplexing (OFDM) signals. The main key idea of the proposed scheme is based on the fact that the best fountain-coded OFDM packets can be generated with a low PAPR. Both theoretical analysis and simulation results prove that the proposed scheme can effectively obtain the desirable PAPR and good throughput with rateless codes. Moreover, the flexibility of controlling PAPR makes the proposed scheme more suitable for implementing random frame sizes and providing effective error detection.
-
reducing the peak to average Power Ratio using unitary matrix transformation
Iet Communications, 2009Co-Authors: Xiaodong Zhu, Guangxi Zhu, Tao JiangAbstract:A theoretical analysis is presented to show that in orthogonal frequency division multiplexing systems, the peak-to-average Power Ratio (PAPR) can be reduced by performing a unitary matrix transformation on the input vector of N symbols. The authors also prove that this transformation does not degrade the bit error rate (BER) or Power spectral density (PSD) performance. Based on this, the inverse discrete Fourier transform matrix is proposed as the unitary matrix to reduce the PAPR. The simulation results show that the proposed scheme can obtain significant PAPR reduction while maintaining good performance in the BER and the PSD. To further evaluate the performance of the proposed scheme, the authors compare it with some well known PAPR reduction techniques by simulations. It is demonstrated that the proposed scheme can offer better system performance and achieve a better compromise with regard to the PAPR reduction, BER, spectral efficiency and computational complexity.
-
an overview peak to average Power Ratio reduction techniques for ofdm signals
IEEE Transactions on Broadcasting, 2008Co-Authors: Tao JiangAbstract:One of the challenging issues for Orthogonal Frequency Division Multiplexing (OFDM) system is its high Peak-to-Average Power Ratio (PAPR). In this paper, we review and analysis different OFDM PAPR reduction techniques, based on computational complexity, bandwidth expansion, spectral spillage and performance. We also discuss some methods of PAPR reduction for multiuser OFDM broadband communication systems.
