Results 101 to 110 of about 47,365 (251)

Power Domain Hybrid Modulation-Based Coherent Optical Transmission with Successive Interference Cancelation

Photonics
The 6G era necessitates advanced multiplexing techniques that fully utilize various physical dimensions, including time, frequency, polarization, and space to enhance the achievable bitrate per wavelength and satisfy growing demands for capacity and ...
Xiaoling Zhang, Yong Geng
doaj   +1 more source

M-ary Coded Mouldation Assisted Genetic Algorithm Based Multiuser Detection for CDMA Systems

, 2003
In this contribution we propose a novel M-ary Coded Modulation assisted Genetic Algorithm based Multiuser Detection (CM-GA-MUD) scheme for synchronous CDMA systems.
Hanzo, L., Ng, S.X., Yen, K.
core  

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   +1 more source

IQ-Modulation Using Phase and Amplitude Modulators and Multimode Interference

Photonics
Optical amplitude and phase modulators are an integral part of modern optical communications systems. As optical data formats transitioned from encoding amplitude exclusively to both amplitude and phase, several different methods for creating the ...
Frank H. Peters
doaj   +1 more source

Antimultipath communication by injecting tone into null in signal spectrum [PDF]

, 1987
A transmitter for digital radio communication creates a null by balanced encoding of data modulated on an RF carrier, and inserts a calibration tone within the null. This is accomplished by having the calibration tone coincide in phase and frequency with
Davarian, Faramaz
core   +1 more source

Integrating dual antennas with hybrid dual circular 32‐quadrature amplitude modulation to increase the coverage area for wireless sensor networks [PDF]

, 2016
Mason Adam, Martin Hope, Haifa Takruri‐Rizk   +2 more
openalex   +1 more source

A Space-Time Spreading Assisted Multicarrier DS-CDMA System using OVSF Codes Employing Adaptive Mode Switching Thresholds and Adaptive Modulation

, 2005
The Concept of Space-Time Spreading (STS) assisted, Adaptive Quadrature Amplitude Modulation (AQAM) aidedMC DS-CDMAis introduced. The AQAMmode-switching thresholds are determined using an on-line real-time Bit-Error-Ratio (BER) based learning procedure ...
Hanzo, L., Wei, H, Yang, L-L.
core  

Analytical evaluation of equivalent energy loss in causal frequency selection filters in the processing of quadrature amplitude modulation signals

, 2020
V. G. Andronov, I. Е. Mukhin, I. G. Babanin, A. E. Sevryukov, D. S. Koptev, A. A. Chuev   +5 more
openalex   +1 more source

Synchronization techniques for all digital 16-ary QAM receivers operating over land mobile satellite links [PDF]

The performance of a low bit rate (64 Kb/s) all digital 16-ary Differentially Encoded Quadrature Amplitude Modulation (16-DEQAM) demodulator operating over a mobile satellite channel, is considered.
Aghvami, A. H., Fines, P.
core   +1 more source

The effects of the cross-entropy stopping criterion and quadrature amplitude modulation on iterative turbo decoding performance

, 2021
Roslina Mohamad, Mohamad Yusuf Mat Nasir, Nuzli Mohamad Anas   +2 more
openalex   +2 more sources