Results 41 to 50 of about 76,661 (236)
Generalized Frequency Division Multiplexing-Based Low-Power Underwater Acoustic Image Transceiver
Sensors, 2021 In this paper, a low-power underwater acoustic (UWA) image transceiver based on generalized frequency division multiplexing (GFDM) modulation for underwater communication is proposed.
Chin-Feng Lin +5 more
doaj +1 more source
Quantized Constant Envelope Precoding With PSK and QAM Signaling [PDF]
IEEE Transactions on Wireless Communications, 2018 Coarsely quantized massive multiple-input multiple-output (MIMO) systems are gaining more interest due to their power efficiency. We present a new precoding technique to mitigate the multi-user interference and the quantization distortions in a downlink ...
H. Jedda +3 more
semanticscholar +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.
Love, D, Nix, AR, Tariq,, Fahim
core +2 more sources
Simulasi Skema Modulasi 1024-QAM dan 4096-QAM pada Sistem Komunikasi Digital
Jurnal Indonesia : Manajemen Informatika dan Komunikasi, 2023 Abstract Quadrature amplitude modulation (QAM) is a modulation scheme used by digital communication systems to obtain high data rates in bandwidth-limited channels. M-ary QAM schemes with M values greater than 256 are currently used by wireless network standards, such as WiFi 6 and WiFi 7 (final standard will be released in 2024), which use the 1024 ...
Danang Maulana Ikhsan, Theophilus Wellem
openaire +3 more sources
QAM to circular isomorphic constellations [PDF]
2016 8th Advanced Satellite Multimedia Systems Conference and the 14th Signal Processing for Space Communications Workshop (ASMS/SPSC), 2016 Employing high order constellations is inevitable in order to achieve higher spectral efficiency in satellite communi- cation systems. In DVB-S2X standard, constellations with up to 256 points have been included. However, optimizing such high order constellations is a difficult task.
openaire +2 more sources
Constellation Mapping for Physical-Layer Network Coding with M-QAM Modulation [PDF]
, 2012 The denoise-and-forward (DNF) method of physical-layer network coding (PNC) is a promising approach for wireless relaying networks. In this paper, we consider DNF-based PNC with M-ary quadrature amplitude modulation (M-QAM) and propose a mapping scheme ...
Guo, Lei +3 more
core +2 more sources
An unequal error protection scheme for non-binary LDPC using statistical QAM and prioritized mapping [PDF]
Serbian Journal of Electrical Engineering, 2018 Low Density Parity Check (LDPC) codes are among the most popular channel codes used nowadays because of their ability to achieve near channel capacity performances.
Indoonundon Madhavsingh +1 more
doaj +1 more source
Symbol error rate analysis for M-QAM modulated physical-layer network coding with phase errors
, 2012 Recent 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 synchrony.
Huang, Y +3 more
core +1 more source
Channel Hardening-Exploiting Message Passing (CHEMP) Receiver in Large-Scale MIMO Systems [PDF]
, 2014 In this paper, we propose a MIMO receiver algorithm that exploits {\em channel hardening} that occurs in large MIMO channels. Channel hardening refers to the phenomenon where the off-diagonal terms of the ${\bf H}^H{\bf H}$ matrix become increasingly ...
Chockalingam, A., Narasimhan, T. Lakshmi
core +1 more source
, 2011 This paper is a thorough study of a digital broadcasting system adapted to the small mountainous island of Mauritius. A digital LAN was designed with MPEG-2 signals. The compressed signals were transmitted using DVB-T and QAM modulators.
Armoogum, Sheeba +2 more
core +1 more source