Results 21 to 30 of about 14,247 (230)
Correlation scheme of frame synchronization in communication systems with QPSK-modulation
Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2017 The information efficiency of communication systems using quadrature amplitude modulation is reduced because of the costs for data transmission necessary to provide frame synchronization and the required time to search for the sync signal and to go into ...
A. V. Sadchenko +4 more
doaj +1 more source
Alexandria Engineering Journal, 2021 The reliability and efficiency of free space optics (FSO) systems is significantly degraded by attenuation caused by different climate conditions and atmospheric turbulence. In this work, an FSO transmission system with high-speed transmission capability
Mehtab Singh +4 more
doaj +1 more source
QAM Based Physical Layer Authentication Technology for Cooperative Communication Systems [PDF]
Zhengzhou Daxue xuebao. Gongxue banA quadrature amplitude modulation (QAM) based cooperative physical layer authentication mechanism was proposed for the identity authentication in two-user cooperative communication systems. In the proposed mechanism, two single-antenna users transmitted
HAN Gangtao +4 more
doaj +1 more source
Turbo Coded and Cooperative Network Coded Non-Coherent Soft-Decision Star-QAM Dispensing with Channel Estimation [PDF]
, 2011 Star Quadrature Amplitude Modulation (Star-QAM) is a non-coherent detection aided scheme ideal for low-complexity wireless transceivers. In this contribution, we first derive soft-decision aided StQAM symbol-to-bit demapping combined with iterative ...
Liang, Dandan +7 more
core +1 more source
IEEE Access, 2022 We report a multi–dimensional quadrature amplitude modulation with M-ary differential phase shift keying (QAM-MDPSK) modulation for optical access network transmission systems employing a Mach–Zehnder modulator (MZM) and a phase modulator ...
Joungmoon Lee +3 more
doaj +1 more source
Efficient implementation of pilot-aided 32 QAM for fixed wireless and mobile ISDN applications [PDF]
, 2000 This paper presents the design and performance of a pilot tone-aided 32 QAM modem developed for wireless ISDN applications. The modem is capable of transmitting a gross data rate of 70 kbit/s in a 20 kHz channel spacing.
Nix, AR, Tariq,, Fahim, Love, D
core +1 more source
Unified bit-based probabilistic data association aided MIMO detection for high-order QAM [PDF]
, 2011 A unified Bit-based Probabilistic Data Association (B-PDA) detection approach is proposed for Multiple-Input Multiple-Output (MIMO) systems employing high-order Quadrature Amplitude Modulation (QAM).
Yang, Shaoshi +5 more
core +1 more source
IEEE Open Journal of the Communications Society, 2021 Communication system’s performance is sensitive to bandwidth, power, cost etc. There have been various solutions to improve the performance, out of them, one of the fundamental solutions over the years is design of optimum modulation schemes.
Praveen Kumar Singya +4 more
doaj +1 more source
Symbol error rate analysis for M-QAM modulated physical-layer network coding with phase errors [PDF]
, 2012 Author version, OK to pubRecent theoretical studies of physical-layer network coding (PNC) show much interest on high-level modulation, such as M-ary quadrature amplitude modulation (M-QAM), and most related works are based on the assumption of phase ...
Song, Q +7 more
core +1 more source
Implementation of Reed-Solomon RS(255,239) Code
Proceedings of the International Conference on Applied Innovations in IT, 2014 In this paper the construction of Reed-Solomon RS(255,239) codeword is described and the process of coding and decoding a message is simulated and verified.
Maja Malenko
doaj +1 more source