Results 11 to 20 of about 51,738 (210)
Design, comparative study and analysis of CDMA for different modulation techni
Egyptian Informatics Journal, 2015 In this work, we have design a MIMO–CDMA using 4 ∗ 8 antennas with the combination of MMSE (Minimum Mean square Error Equalizer) for BPSK (Binary Phase shift Keying), QPSK (Quadrature Phase Shift Keying), 16-QAM, 64-QAM and 256-QAM (Quadrature Amplitude ...
Arun Kumar, Manisha Gupta
doaj +3 more sources
A Novel QAM Technique for High Order QAM Signaling
Radioengineering, 2011 The paper proposes a novel spread quadrature amplitude modulation (S-QAM) technique with high SNR improvement for high-order QAM channels. Simulated and experimental bit error rate (BER) performance analyses of the proposed technique in blind and non ...
A. Ozen
doaj +2 more sources
Pengaruh Link Relay Terhadap Kinerja Komunikasi Kooperatif Vehicle-to-Vehicle (V2V)
Jurnal Elkomika, 2022 ABSTRAK Kebutuhan komunikasi bergerak saat ini sangat tinggi, Vehicular Ad-hoc Network (VANET) merupakan metode teknologi telekomunikasi untuk komunikasi bergerak pada kendaraan.
ISNAN MUHARRAM +2 more
doaj +1 more source
Transmission of OCDM Based on Asymmetric Pair Mapping Over a Seven Core Fiber
IEEE Photonics Journal, 2022 In this paper, transmission of orthogonal chirp division multiplexing (OCDM) based on asymmetric pair mapping over a seven core fiber is proposed. High-order 32 quadrature amplitude modulation (QAM) is reduced to quadrature phase-shift keying (QPSK) and ...
Shuaidong Chen +12 more
doaj +1 more source
Comparison of 128-SP-QAM with PM-16-QAM
Optics Express, 2012 In this paper we investigate an interesting modulation format for fiber optic communications, set-partitioning 128 polarization-multiplexed 16-QAM (128-SP-QAM), which consists of the symbols with even parity from the symbol alphabet of polarization-multiplexed 16-QAM (PM-16-QAM).
Martin, Sjödin +5 more
openaire +2 more sources
Journal of Information and Telecommunication, 2020 In this work, we analyse pointing error effects on the performance of amplify-and-forward (AF) relaying multiple-input multiple-output (MIMO) free-space optical (FSO) communication system employing sub-carrier quadrature amplitude modulation (SC-QAM ...
Duong Huu Ai +2 more
doaj +1 more source
Journal of ICT Research and Applications, 2020 Higher-order modulation schemes in optical communication systems that suffer from several impairments can use artificial intelligence (AI) algorithms, among other possible techniques, to mitigate these issues.
Mustafa A. Jalil +2 more
doaj +1 more source
Theoretical and experimental design of an alternative system to 2 x 2 MIMO for LTE over 60 km directly modulated RoF link [PDF]
, 2012 Relay nodes (RN) are used as an important structure to extend the coverage of the Third Generation Partnership Program’s Long Term Evolution (3GPP-LTE). The promising technology as the interface between eNodeB (eNB) and RN is radio-over-fibre (RoF), due ...
Ghassemlooy, Zabih +3 more
core +1 more source
Noise Shaping Enhanced DMT Signal Transmission Utilizing Low-Resolution DAC
IEEE Photonics Journal, 2021 In order to reduce the quantization noise of low-resolution DAC, we study a noise shaping technique that can reshape the white quantization noise to an irregular spectrum, in which the noise in the data subcarrier band is almost transformed into the null
Fan Li +9 more
doaj +1 more source
Enhancing MB-OFDM throughput with dual circular 32-QAM [PDF]
, 2008 Quadrature Phase Shift Keying (QPSK) and Dual Carrier Modulation (DCM) are currently used as the modulation schemes for Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) in the ECMA-368 defined Ultra-Wideband (UWB) radio platform.
Sherratt, R.S., Yang, R.
core +1 more source