scholarly journals Coherent demodulation of the two-level APSK signals with the symbol amplitude estimation

2021 ◽  
Vol 2094 (2) ◽  
pp. 022050
Author(s):  
O V Chernoyarov ◽  
A N Glushkov ◽  
V P Litvinenko ◽  
V A Mironov ◽  
A V Salnikova
Keyword(s):  
Phase Shift ◽  
Phase Detector ◽  
Threshold Values ◽  
Coherent Demodulation ◽  
Amplitude Estimation ◽  
Multi Level ◽  
Digital Demodulation ◽  
Phase Demodulation

Abstract The study focuses on the algorithms for the coherent demodulation of the two-level amplitude phase-shift keyed signals with an estimate of the received symbol amplitude carried out by its relative comparison with the preceding symbol amplitude. Determining calibrated values of the symbol amplitudes in order to compare them with the preset threshold values is considered unnecessary in this case. Phase demodulation is implemented based on the phase detector of the multi-level phase-shift keyed signals. Symbol amplitudes are determined by the quadrature channels responses. Both analog and digital demodulation algorithms are considered. Simulation of the demodulation algorithm is carried out.

scholarly journals Analytical Models for the Computation of Error Probability of Multi-Level Phase Shift Keying Modulation Scheme

2021 ◽  
Vol 4 (1) ◽  
pp. 13-20
Author(s):  
Isaac A. E. ◽  
Dike H.U.
Keyword(s):  
Phase Shift ◽  
Error Probability ◽  
Error Function ◽  
Density Ratio ◽  
Analytical Models ◽  
Modulation Scheme ◽  
Noise Power ◽  
Phase Shift Keying ◽  
Shift Keying ◽  
Multi Level

In this paper, analytical models for the computation of error probability (BER) of the Multi-level Phase Shift Keying (MPSK) modulation scheme is presented. Analytical models for computing MPSK bit error probability based on Q function, error function (erf) and complementary error function (erfc) are presented. Also, an analytical model for computing the symbol error rate for MPSK is presented. Furthermore, a generalized analytical expression for BER as a function of modulation order (M) and energy per bit to noise power density ratio (Eb/No) is presented. The BER was computed for various values of M (2 ≤ M ≤ 256) and Eb/No (0 dB ≤ Eb/No ≤ 14 Db). The results showed that at Eb/No =12 dB, a BER of 9.006E-09 is realized for M =2 and M =4 whereas BER of 1.056E-01 is realized for M = 256. Also, for the same M = 2 , the value of BER decreased from 1.2501E-02 at Eb/No = 4 dB to 9.0060E-09at Eb/No =12 dB. Generally, the results showed that for the MPSK modulation scheme, for a given value of Eb/No, the lower modulation order (M) has a lower BER and for a given modulation order, (M) the BER decreases as Eb/No increases.

Rapid extraction of the phase shift of the cold-atom interferometer via phase demodulation

2015 ◽  
Vol 24 (11) ◽  
pp. 113704 ◽  
Author(s):  
Bing Cheng ◽  
Zhao-Ying Wang ◽  
Ao-Peng Xu ◽  
Qi-Yu Wang ◽  
Qiang Lin
Keyword(s):  
Phase Shift ◽  
Cold Atom ◽  
Atom Interferometer ◽  
Rapid Extraction ◽  
Phase Demodulation

Digital demodulation of the signals phase-shift keyed in toto and coded by walsh sequences

2017 ◽  
Author(s):  
Vladimir P. Litvinenko ◽  
Alexey N. Glushkov ◽  
Boris V. Matveev ◽  
Alexandra V. Salnikova ◽  
Oleg V. Chernoyarov
Keyword(s):  
Phase Shift ◽  
Digital Demodulation

Multi-Level Phase Shift (MLPS) Control Enabled Variable Displacement Gerotor/Geroler

2007 ◽  
Author(s):  
QingHui Yuan ◽  
Brian Armstrong
Keyword(s):  
Phase Shift ◽  
Tracking Control ◽  
Control Algorithm ◽  
Control Law ◽  
Family Selection ◽  
Control Scheme ◽  
Variable Displacement ◽  
Multi Level ◽  
Velocity Tracking ◽  
Peak Value

The research focuses on enabling gerotor/geroler, a traditional fixed displacement device, with the variable displacement capability by integrating electronically controlled digital valves and the corresponding control algorithm. Each digital valve controls polarity of each corresponding chamber of the fixed displacement device. A novel Multi-Level Phase Shift (MLPS) control scheme is developed such that the instantaneous displacement of such a system can be controlled. This control law is characteristic of classifying all the possible valve configuration into several displacement families where the peak value within each family would be identical. Given a desired displacement, both displacement family selection and phase shift technology are utilized to achieve better performance. In the experimental study, MLPS control has been verified, and successfully achieves a closed loop velocity tracking control of a hydraulic geroler motor.

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