High-power operation of a K-band second harmonic gyroklystron [PDF]
, 1993 Amplification studies of a two-cavity second-harmonic gyroklystron are reported. A magnetron injection gun produces a 440 kV, 200–245 A, 1 μs beam with an average perpendicular-to-parallel velocity ratio slightly less than 1.
Calame, J +8 more
core +1 more source
Square Complex Orthogonal Designs with Low PAPR and Signaling Complexity
, 2008 Space-Time Block Codes from square complex orthogonal designs (SCOD) have been extensively studied and most of the existing SCODs contain large number of zero.
Das, Smarajit, Rajan, B. Sundar
core +1 more source
New peak-to-average power-ratio reduction algorithms for multicarrier communications [PDF]
2003 IEEE Pacific Rim Conference on Communications Computers and Signal Processing (PACRIM 2003) (Cat No 03CH37490) PACRIM-03, 2003 Two new peak-to-average power-ratio (PAPR) reduction algorithms for passband multicarrier systems are deduced by applying optimization to modulation constellations. The associated optimization problem can be solved by two different methods, namely, the second-order cone programming method and the least-pth unconstrained optimization method.
Y.J. Kou, W.-S. Lu, A. Antoniou
openaire +1 more source
Controlling Peak-to-Average Power Ratio in Orthogonal Frequency Division Multiplexing System
Journal of Engineering and Sustainable Development, 2013 A major drawback of Orthogonal Frequency Division Multiplexing at the transmitter side is the high peak-to-average power ratio (PAPR) of the signal. Conventional solutions for this problem are to use a linear amplifier ( or to back-off the operating ...
Ismail Sh. Baqir
doaj
Partial Transmit Sequences for Peak-to-Average Power Ratio Reduction in Multiantenna OFDM
EURASIP Journal on Wireless Communications and Networking, 2008 The major drawback of orthogonal frequency-division multiplexing (OFDM) is its high peak-to-average power ratio (PAR), which gets even more substantial if a transmitter with multiple antennas is considered.
Siegl Christian, Fischer RobertFH
doaj
PEAK-TO-AVERAGE POWER RATIO REDUCTION USING CODING AND HYBRID TECHNIQUES FOR OFDM SYSTEM [PDF]
ICTACT Journal on Communication Technology, 2016 In this article, the research work investigated is based on an error correction coding techniques are used to reduce the undesirable Peak-to-Average Power Ratio (PAPR) quantity.
Bahubali K. Shiragapur, Uday Wali
doaj
IEEE Access, 2018 Multicarrier faster-than-Nyquist (MFTN) is a spectral efficient transmission scheme for future communication systems. However, as one of the most important drawbacks of multicarrier transmission systems, the peak-to-average power ratio (PAPR) of MFTN ...
Aijun Liu +5 more
doaj +1 more source
Constrained RS coding for Low Peak to Average Power Ratio in FBMC - OQAM Systems [PDF]
Journal of Electrical and Electronics Engineering, 2019 Multi-carrier modulation techniques have now become a standard in many communication protocols. Filter bank based multi-carrier (FBMC) generation techniques have been discussed in the literature as a means for overcoming the shortcomings of IFFT/FFT ...
Job CHUNKATH +2 more
doaj
Distributions of Upper PAPR and Lower PAPR of OFDM Signals in Visible Light Communications
, 2014 Orthogonal frequency-division multiplexing (OFDM) in visible light communications (VLC) inherits the disadvantage of high peak-to-average power ratio (PAPR) from OFDM in radio frequency (RF) communications.
Baxley, Robert J. +2 more
core +1 more source
Distributed Precoding for BER Minimization With PAPR Constraint in Uplink Massive MIMO Systems
IEEE Access, 2018 Precoding can effectively reduce the peak-to-average power ratio (PAPR) of the transmitted waveform but will usually degrade the bit error rate (BER) performance.
Wei Peng +4 more
doaj +1 more source