Results 31 to 40 of about 145,584 (294)
Hitless Rate Switching for Dynamically Reconfigurable Optical Systems
IEEE Photonics Journal, 2015 We propose a set of techniques to enable hitless rate switching for reconfigurable optical systems and validate, by computer simulations, their applicability to NRZ, RZ, and Nyquist pulse shapes. The polarization-multiplexed quadrature phase-shift keying
Valery N. Rozental, Darli A. A. Mello
doaj +1 more source
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
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KNN BASED CLASSIFICATION OF DIGITAL MODULATED SIGNALS
International Islamic University Malaysia Engineering Journal, 2016 Demodulation process without the knowledge of modulation scheme requires Automatic Modulation Classification (AMC). When receiver has limited information about received signal then AMC become essential process. AMC finds important place in the field many
Sajjad Ahmed Ghauri
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Российский технологический журнал, 2021 Quadrature amplitude modulation (QAM) is used for high-speed information transmission in many radio systems and, in particular, in DVB-S and DVB-S2/S2X digital satellite television systems.
G. V. Kulikov, A. A. Lelyukh
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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
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Short-range ultrasonic communications in air using quadrature modulation [PDF]
, 2009 A study has been undertaken of ultrasonic communications methods in air, using a quadrature modulation method. Simulations were first performed to establish the likely performance of quadrature phase shift keying over the limited bandwidth available in ...
Green, Roger, Hutchins, David A., Li, C.
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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
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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
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Upper-Bound Performance of a Wide-Band Adaptive Modem
, 1999 Adaptive modulation is applied in conjunction with a decision-feedback equalizer (DFE) in order to mitigate the effects of the slowly varying wide-band multipath Rayleigh fading channel in a noise-limited environment.
Hanzo, L., Wong, C.H.
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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
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