Results 101 to 110 of about 22,805 (227)

A short survey on nonlinear models of the classic Costas loop: rigorous derivation and limitations of the classic analysis

, 2015
Rigorous nonlinear analysis of the physical model of Costas loop --- a classic phase-locked loop (PLL) based circuit for carrier recovery, is a challenging task.
Best, R. E., Kuznetsov, N. V., Kuznetsova, O. A., Leonov, G. A., Yuldashev, M. V., Yuldashev, R. V.   +5 more
core   +1 more source

Performance Improvement of QPSK Signal Predetection EGC Diversity Receiver [PDF]

, 2012
This paper proposes a modification of quadrature phase-shift-keying (QPSK) signal diversity reception with predetection equal gain combiner (EGC). The EGC combining is realized by using the constant modulus algorithm (CMA).
Dimitrijevic, B., Djordjevic, G. T., Milosevic, N., Nikolic, B.   +3 more
core   +1 more source

Nonlinear optimized Fast Locking PLLs Using Genetic Algorithm

Iranian Journal of Electrical and Electronic Engineering, 2009
— This paper presents a novel approach to obtain fast locking PLL by embedding a nonlinear element in the loop of PLL. The nonlinear element has a general parametric Taylor expansion.
H. Miar- Naimi, M. Zabihi
doaj  

Phase error statistics of a phase-locked loop synchronized direct detection optical PPM communication system [PDF]

Receiver timing synchronization of an optical Pulse-Position Modulation (PPM) communication system can be achieved using a phased-locked loop (PLL), provided the photodetector output is suitably processed.
Gardner, C. S., Natarajan, Suresh
core   +1 more source

Phase locked loop synchronization for direct detection optical PPM communication systems [PDF]

Receiver timing synchronization of an optical pulse position modulation (PPM) communication system can be achieved using a phase locked loop (PLL) if the photodetector output is properly processed. The synchronization performance is shown to improve with
Chen, C. C., Gardner, C. S.
core   +1 more source

Testing of PLL-based True Random Number Generator in Changing Working Conditions [PDF]

, 2011
Security of cryptographic systems depends significantly on security of secret keys. Unpredictability of the keys is achieved by their generation by True Random Number Generators (TRNGs).
Drutarovsky, M., Fischer, V., Simka, M.
core   +2 more sources

Steady-state phase error for a phase-locked loop subjected to periodic Doppler inputs [PDF]

The performance of a carrier phase locked loop (PLL) driven by a periodic Doppler input is studied. By expanding the Doppler input into a Fourier series and applying the linearized PLL approximations, it is easy to show that, for periodic frequency ...
Chen, C.-C., Win, M. Z.
core   +1 more source

Expandable and reconfigurable instrument node arrays [PDF]

, 2012
An expandable and reconfigurable instrument node includes a feature detection means and a data processing portion in communication with the feature detection means, the data processing portion configured and disposed to process feature information.
Deshpande, Manohar, Hilliard, Lawrence M.   +1 more
core   +1 more source

Compensation characterization of the UPQC system under an improved nonlinear controller based on the MSTOGI-PLL device

Frontiers in Energy Research
To solve the delay problem of a unified power quality conditioner (UPQC) system during the separation of the fundamental positive-order components and to better filter out the DC and harmonic components to realize accurate phase locking, a mixed second ...
Yuting Yu, Yuting Yu, Dan Li, Yanting Chu, Yanting Chu   +4 more
doaj   +1 more source

Optimum filters and smoothers design for carrier phase and frequency tracking [PDF]

The report presents the application of fixed lag smoothing algorithms to the problem of estimation of the phase and frequency of a sinusoidal carrier received in the presence of process noise and additive observation noise.
Kumar, Rajendra
core   +1 more source