Results 81 to 90 of about 10,809 (212)
Achievable Rates Comparison for Phase-Conjugated Twin-Waves and PM-QPSK [PDF]
, 2016 Phase-conjugated twin-waves (PCTW)-QPSK is experimentally compared to PM-QPSK in terms of achievable information rate for bit-wise decoders. For typical long-haul transmission distances, PM-QPSK with soft-decision FEC achieves significantly higher ...
Eriksson, Tobias +5 more
core
Repeated-and-Offset QPSK for Low-PAPR DFT-s-OFDM in Satellite Communications
IEEE Open Journal of the Communications SocietyMotivated by the convergence of terrestrial cellular networks and satellite communications, this article considers an adaptation of offset quadrature phase shift keying (OQPSK), traditionally used with single-carrier waveforms in satellite systems, to ...
Renaud-Alexandre Pitaval
doaj +1 more source
Variable-length balanced codes for quadrature phase shift keyed systems
The Journal of Engineering, 2015 The authors outline an approach to construct capacity-approaching balanced quadrature phase shift keyed (QPSK) codes. These codes ensure an equal number of different symbol values and many symbol transitions in the encoded sequence in order to assist ...
Xin Tu, Ivan J. Fair
doaj +1 more source
Iterative demapping for QPSK modulation
Electronics Letters, 1998 The authors present an iterative decoding scheme which is particularly suited for quadrature phase shift keying (QPSK) modulation with anti-Gray mapping. At the receiver, a soft demapper accepting a priori information and a convolutional decoder are applied in a serial concatenation.
S. ten Brink, J. Speidel, R.-H. Yan
openaire +1 more source
Performance evaluation of coherent WDM PS-QPSK (HEXA) accounting for non-linear fiber propagation effects [PDF]
, 2010 Coherent-detection (CoD) permits to fully exploit the fourdimensional (4D) signal space consisting of the in-phase and quadrature components of the two fiber polarizations.
CARENA, Andrea +4 more
core +1 more source
Direct-detection receiver for QPSK-modulated signals
, 2023 We demonstrate a novel optical receiver for direct-detection of QPSK signals using microring-based photonic integrated circuit. The QPSK signal is converted into a PAM7 electrical signal, and demodulated without the need for a local ...
Bekele, Dagmawi +6 more
core +1 more source
IEEE Photonics Journal, 2017 A novel frequency-tunable binary phase-coded microwave signal generator with a tunable frequency multiplication factor is proposed. The key component of the proposed system is a dual-polarization quadrature phase-shift-keying (DP-QPSK) modulator, which ...
Yang Chen, Shilong Pan
doaj +1 more source
Design of QPSK demodulator / Hasbullah Hussein [PDF]
, 1995 This paper describes the design, construction and testing of a quadrature phase shift keying (QPSK) demodulator. QPSK is an efficient modulation scheme.This scheme is used extensively in communication systems e.g digital satellite, digital microwave and ...
Hussein, Hasbullah
core
PhotonicsTo effectively mitigate the effects of atmospheric turbulence in free space optical (FSO) communication, we propose a parallel carrier frequency offset estimation (FOE) scheme based on time-tagged QPSK partitioning (TTQP).
Siqi Zhang +3 more
doaj +1 more source
Unequal Error Protection QPSK Modulation Codes [PDF]
, 1992 The authors use binary linear UEP (LUEP) codes, in combination with a QPSK signal set and Gray mapping, to obtain new efficient block QPSK modulation codes with unequal minimum squared Euclidean distances.
R.H. Morelos-Zaragoza +3 more
core +1 more source