Results 101 to 110 of about 10,809 (212)

Application of microwave six-port in software radio

Tongxin xuebao, 2005
Common formulas of six-port demodulation orthogonal modulation signals was educed. The results of simulation in demodulation QPSK, 16QAM, π/4QPSK modulation signals are well agreement with the theory analysis.
ZHANG Lan1, WANG Bing2, FENG Ke-jin1
doaj   +2 more sources

Evaluating MIMO-VLC System Performance: Modulation Techniques and Ambient Light Interference Effects

Photonics
Visible light communication (VLC) is an emerging optical wireless technology capable of delivering high data rates for both indoor and outdoor environments.
Emad S. Hassan, Abdoh Jabbari, Ayman A. Alharbi   +2 more
doaj   +1 more source

Achievable Rates Comparison for Phase-Conjugated Twin-Waves and PM-QPSK [Elektronisk resurs]

, 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 ...
Lorences Riesgo, Abel,, Eriksson, Tobias,, Johannisson, Pontus,, Fehenberger, Tobias,, Karlsson, Magnus,, Andrekson, Peter,   +5 more
core  

Adaptive Modulation (QPSK, QAM)

CoRR, 2013
In this paper, introduced below are the concepts of digital modulation used in many communication systems today. Techniques described include quadrature phase shift keying (QPSK) and quadrature amplitude modulation (QAM) and how these techniques can be used to increase the capacity and speed of a wireless network.
openaire   +3 more sources

Ultra-long-haul transmission of 7×42.9 Gbit/s PS-QPSK and PDM-BPSK

, 2011
We investigated ultra-long-haul transmission of polarization-switched QPSK (PS-QPSK) and polarization-division-multiplexed BPSK (PDM-BPSK) at 42.9 Gbit/s experimentally as well as by means of computer simulations.
Killey, RI, Makovejs, S, Millar, DS, Thomsen, BC, Savory, SJ, Lavery, D, Bayvel, P, ,, Behrens, C   +8 more
core  

Design of differential QPSK modulator

Electronics Letters, 1991
A differential QPSK modulator operating at a centre frequency of 847.5 MHz and an input data rate of 25 Mbit/s is described. The modulator incorporates a simple differential encoder design that interfaces directly to the RF section without the need for special driver circuitry. The RF section uses modular ‘building block’ components that can be changed
openaire   +1 more source

Design of QPSK modulator / Maziana Mohamad [PDF]

, 1995
The objective of this project is to study, design and construct the Quadrature Phase Shift Keying (QPSK) modulator to operate at a frequency of 10 MHz with an input data rate of 2.4 kbits/s. QPSK is an efficient digital modulation scheme. This modulation
Mohamad, Maziana
core  

Comparison of PS-QPSK and PM-QPSK at Different Data Rates in a 25 GHz-spaced WDM System

, 2012
We compare polarization-switched QPSK and polarization-multiplexed QPSK in a WDM system with 25 GHz channel spacing. We investigate experimentally the transmission distance as a function of the data rate for both modulation ...
M. Karlsson, Shinada, Satoshi, B. J. Puttnam, Karlsson, Magnus, S. Shinada, P. A. Andrekson, Puttnam, Benjamin, Wada, Naoya, Wada, N., P. Johannisson, Andrekson, Peter, Johannisson, Pontus, M. Sjödin, N. Wada, Sj\uf6din, Martin E, Sjödin, Martin   +15 more
core   +1 more source

Performance analysis of atomic magnetometer and bandwidth-extended loop antenna in resonant phase-modulated magnetic field communication system

ETRI Journal
Telecommunications through an electrically conductive medium require the use of carrier bands with very-low and ultralow frequencies to establish radiofrequency links in harsh environments.
Hyun Joon Lee, Jung Hoon Oh, Jang-Yeol Kim, In-Kui Cho   +3 more
doaj   +1 more source