Results 31 to 40 of about 10,809 (212)
Near Optimal Common Detection Techniques for Shaped Offset QPSK and Feher's QPSK
IEEE Transactions on Communications, 2008 A detector architecture capable of detecting both shaped offset quadrature phase shift keying (SOQPSK-TG) and Feher's quadrature phase shift keying (FQPSK-JR) is developed and analyzed. Both modulations are embodied as fully interoperable modulations in the Interrange Instrumentation Group (IRIG) standard IRIG-106.
Tom Nelson, Erik Perrins, Michael Rice
openaire +2 more sources
A proof-of-concept superregenerative QPSK transceiver [PDF]
2014 21st IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2014 In this paper we present a description and experimental verification of an HF-band proof-of-concept superregenerative transceiver for QPSK signals. We describe a simple implementation of an all-digital, FPGA-based, QPSK transmitter section. On the receiver side, the quench signal is generated in the same FPGA with a minimum of analog circuitry.
López Riera, Alexis +5 more
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Estimating OSNR of equalised QPSK signals
Optics Express, 2011 We propose and demonstrate a technique to estimate the OSNR of an equalised QPSK signal based on the radial moments of the complex signal constellation. The technique is compared through simulation with maximum likelihood estimation and the effect of the block size used in the estimation is also assessed.
David J, Ives +3 more
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Технічна інженеріяThe article discusses current issues related to ensuring the reliability of data transmission channels in modern information networks. The main destabilising factors affecting the quality of wireless channels are identified, in particular multipath ...
O.I. Lastivka, O.P. Nechyporuk
doaj +1 more source
IEEE Photonics Journal, 2016 A novel dual-tone quadrature phase-shift keying (QPSK) optical millimeter (mm)-wave signal generation by frequency nonupling the radio-frequency QPSK signal via an optical phase modulator (PM) without phase precoding is proposed.
Jianxin Ma
doaj +1 more source
Pulse shaping for differential offset-QPSK [PDF]
IEEE Transactions on Communications, 2006 Pulse shaping is examined as a means to improve the performance of a differential offset quadrature phase-shift keying system in a bandwidth-constrained environment. Through optimization with respect to a composite Nyquist criterion, the derived pulse shapes have comparable performance to a pi/4-differential quadrature phase-shift keying in an additive
A. C. C. Lam +3 more
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ML‐Assisted Adaptive Fade Mitigation for Satellite Connectivity
International Journal of Satellite Communications and Networking, EarlyView.ABSTRACT The demand for reliable and high‐quality wireless networks driven by resource‐intensive applications and services is growing rapidly and invoked the emergence of beyond 5G (B5G) and 6G paradigm and technologies which include satellite systems as part of the nonterrestrial networks (NTN).
Jinwara Surattanagul +4 more
wiley +1 more source
, 2014 We compare QPSK with a rate 0.75 LDPC-code and PS-QPSK, which have the same spectral efficiency, in long-haul WDM transmission. We show that LDPC-coded PM-QPSK can achieve up to 98% increased transmission distance over uncoded PS-QPSK at BER = 10 ...
Karlsson, Magnus +14 more
core +1 more source
Vierdimensionale kodierte Modulationsverfahren: 6PolSK-QPSK
, 2022 S.125-130In this contribution we compare the performance of polarization-division multiplexed quadrature phase-shift keying (PDM-QPSK) signals and 6-ary polarization-shift keying (6PolSK)-QPSK signals in wavelength-division multiplexing (WDM) experiments
Meuer, C. +8 more
core +1 more source
IEEE Access, 2020 In this paper, a new type of quadrature phase shift keying (QPSK) modulation, named as special QPSK (SQPSK), is proposed and optimized. For SQPSK, the quadrant of the symbol is determined by the bits in information sequence according to QPSK ...
Rugui Yao +6 more
doaj +1 more source