Circular
IEEE Access, 2019 This paper proposes M-ary circular θ-quadrature amplitude modulation (CTQAM) for M = 2l, l ≥ 4, which is constructed by rearrangement of the signal points based on θ-QAM.
Seongjin Ahn, Dongweon Yoon
doaj +1 more source
Study of an electro-optic modulator capable of generating simultaneous amplitude and phase modulations [PDF]
, 2003 We report on the analysis and prototype-characterization of a dual-electrode electro-optic modulator that can generate both amplitude and phase modulations with a selectable relative phase, termed a universally tunable modulator (UTM).
Bowen +12 more
core +2 more sources
Feedback reliability calculation for an iterative block decision feedback equalier [PDF]
, 2009 A new class of iterative block decision feedback equalizer (IB-DFE) was pioneered by Chan and Benvenuto. Unlike the conventional DFE, the IB-DFE is optimized according to the reliability of the feedback (FB) symbols.
Armour, SMD, Huang, G, Nix, AR
core +2 more sources
Frequency and quadrature amplitude modulation for 5G networks [PDF]
2016 European Conference on Networks and Communications (EuCNC), 2016 The emerging fifth generation (5G) wireless access network, aiming at providing ubiquitous and high data rate connectivity, is envisaged to deploy large number of base stations with higher density and smaller sizes, where inter-cell interference (ICI) becomes a critical problem.
Wu, Shangbin +3 more
openaire +2 more sources
IEEE Photonics JournalAn all-optical format conversion (AOFC) scheme for the input 30 Gbit/s rectangular 8-ary quadrature amplitude modulation (8QAM) signal is proposed and numerically investigated based on phase-sensitive amplification (PSA) and nonlinear Mach-Zehnder ...
Qiankun Li +7 more
doaj +1 more source
Iterative Multiuser Minimum Symbol Error Rate Beamforming Aided QAM Receiver
, 2008 A novel iterative soft interference cancellation (SIC) aided beamforming receiver is developed for high-throughput quadrature amplitude modulation systems.
Chen, Sheng, Hanzo, L., Tan, S.
core +1 more source
DAC-Less amplifier-less generation and transmission of QAM signals using sub-volt silicon-organic hybrid modulators [PDF]
, 2015 We demonstrate generation and transmission of optical signals by directly interfacing highly efficient silicon-organic hybrid (SOH) modulators to binary output ports of a field-programmable gate array. Using an SOH Mach-Zehnder modulator (MZM) and an SOH
Bogaerts, Wim +10 more
core +3 more sources
Quadrature amplitude modulation in modulating retroreflector system
Electronics Letters, 2003 It has been shown that the data throughput of an optical modulating retroreflector (MRR) system can be enhanced by use of spectrally efficient M-ary quadrature amplitude modulation (M-ary QAM). It has been demonstrated that this MRR system has sufficient dynamic range to support up to 64-QAM at 30 Mbit/s in a 6.75 MHz channel bandwidth.
P.G. Goetz +4 more
openaire +1 more source
Reproducing single-carrier digital modulation schemes for VLC by controlling the first switching harmonic of the dc-dc power converter output voltage ripple [PDF]
, 2018 A DC-DC power converter based on a two-phase synchronous buck converter that reproduces single-carrier digital modulation schemes by controlling the first switching harmonic of the output voltage ripple is presented in this work.
Fernández Miaja, Pablo +3 more
core +2 more sources
Construction of Circular Quadrature Amplitude Modulations (CQAM) [PDF]
2018 IEEE International Conference on the Science of Electrical Engineering in Israel (ICSEE), 2018 Circular quadrature amplitude modulations (CQAM) are introduced as an alternative to mono-dimensional ASK constellations (and their QAM Cartesian product) for probabilistic shaping with non-binary error-correcting codes. We propose an exact construction method via recursive equations for bi-dimensional CQAM constellations.
Van Wonterghem, Johannes +2 more
openaire +2 more sources