Results 91 to 100 of about 51,738 (210)
A new low-cost discrete bit loading using greedy power allocation [PDF]
, 2009 In this paper we consider a low cost bit loading based on the greedy power allocation (GPA). Compared to the standard GPA, which is optimal in terms of maximising the data throughput, three suboptimal schemes are suggested, which perform GPA on subsets ...
Alhanafy, W.E.A.E., Weiss, S.
core
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
Оптимізація демодулятора QAM сигналів
Вісник Національного технічного університету України Київський політехнічний інститут. Серія: Радіотехніка. Радіоапаратобудування, 2014 The processes of signal processing in the quadrature demodulator and the problem of clock synchronization and reference oscillations of quadrature basis providing are considered for a relatively high speed modulation conditions. Main part. The analysis is performed and the basic concepts of the implementation of PLL clock oscillation for optimum ...
Pavlov, O. I., Zaharchenko, O. S.
openaire +3 more sources
Low-Complexity Detection of High-Order QAM Faster-Than-Nyquist Signaling
IEEE Access, 2017 Faster-than-Nyquist (FTN) signaling is a promising non-orthogonal transmission technique to considerably improve the spectral efficiency. This paper presents the first attempt in the literature to estimate the transmit data symbols of any high-order ...
Ebrahim Bedeer +2 more
doaj +1 more source
IEEE Access, 2019 By using a multi-color laser diode carrier with orthogonal polarization and single-carrier modulation, the long-reach single-mode fiber (SMF) passive optical network and millimeter-wave wireless access network (WAN) with carrying narrow-band and ...
Huai-Yung Wang +4 more
doaj +1 more source
Capacity of 60 GHz Wireless Communications Based on QAM
Journal of Applied Mathematics, 2014 With apparent advantages of the several GHz license-free spectrums, 10 W maximum transmit power, and so forth, 60 GHz wireless communication technology has become the first choice for Gbps level short-range wireless communications.
Jingjing Wang +5 more
doaj +1 more source
New QAM Complementary Sequences for Control of Peak Envelope Power of OFDM Signals
IEEE Access, 2019 By developing new mathematical descriptions of 4q (integer q 2) quadrature amplitude modulation (QAM) constellation, a novel construction producing 4q-QAM complementary sequences (CSs) of length 2m (integer m 2) is presented.
Yue Zeng +5 more
doaj +1 more source
IEEE Photonics Journal, 2019 Modulation format identification (MFI) is necessary for future elastic optical networks. We propose an MFI scheme based on the amplitude deviation analysis of the received optical communication signal.
Zhao Zhao +3 more
doaj +1 more source
, 2008 This paper (Part of the content of this manuscript has been accepted for presentation in IEEE Globecom 2008, to be held in New Orleans) deals with low maximum likelihood (ML) decoding complexity, full-rate and full-diversity space-time block codes (STBCs)
Rajan, B. Sundar, Srinath, K. Pavan
core
Engineering Science and Technology, an International JournalA new mmWave transmitter architecture with multibeam-based segmented beamforming arrays (SBAs) for high-efficiency and secure communication is proposed.
Seung-Won Oh, Woo-Hee Lim, Han Lim Lee
doaj +1 more source