Results 111 to 120 of about 145,584 (294)

Performance of multiple amplitudes differential space-time block coding scheme concatenated with channel coding

Tongxin xuebao, 2007
By introducing multiple levels quadrature amplitude modulation and matrix transform method,a multiple am-plitudes differential space-time coding（DSTC） scheme was developed.The scheme can avoid the performance loss of conventional DSTC schemes based on ...
YU Xiang-bin1, ZHANG Sheng-nan1, BI Guang-guo2   +2 more
doaj   +2 more sources

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

Minimum Symbol Error Rate Turbo Multiuser Beamforming Aided QAM Receiver

, 2008
This paper studies a novel iterative soft interference cancellation (SIC) aided beamforming receiver designed for highthroughput quadrature amplitude modulation systems communicating over additive white Gaussian noise channels.
Chen, Sheng, Hanzo, L, Tan, S
core   +1 more source

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  

Noisy Index Coding with Quadrature Amplitude Modulation (QAM) [PDF]

, 2015
Anjana A. Mahesh, B. Sundar Rajan
openalex   +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

Experimental characterization of frequency dependent squeezed light

, 2005
We report on the demonstration of broadband squeezed laser beams that show a frequency dependent orientation of the squeezing ellipse. Carrier frequency as well as quadrature angle were stably locked to a reference laser beam at 1064nm.
Alexander Franzen, Boris Hage, D. F. Walls, G. Breitenbach, Henning Vahlbruch, K. S. Thorne, K. Schneider, Karsten Danzmann, Nico Lastzka, R. W. P. Drever, Roman Schnabel, Simon Chelkowski, U. Leonhardt, V. B. Braginsky, W. G. Unruh   +14 more
core   +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  

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