Results 71 to 80 of about 2,223,777 (199)

Genetically Enhanced Performance of a UTRA-like Time-Division Duplex CDMA Network

open access: yes, 2005
In this contribution a Dynamic Channel Allocation (DCA) algorithm is developed, which minimizes the amount of Multi-User Interference (MUI) experienced at the Base Stations (BSs) by employing Genetic Algorithms (GAs).
Ni, S., Hanzo, L.
core   +1 more source

DESIGN AND IMPLEMENTATION OF IMPROVED SUPERIMPOSED CYCLIC OPTICAL ORTHOGONAL CODES (SCOOC) BASED OPTICAL ENCODER/DECODER STRUCTURE FOR 1GBPS OPTICAL CDMA SYSTEM [PDF]

open access: yesJournal of Engineering Science and Technology, 2010
In this paper, an improved form of two dimensional optical orthogonal codes is introduced for optical CDMA system by using just six lasers. This new technique not only reduces the length of the code but also improves the bit error rate (BER) performance ...
GURJIT KAUR, NEENA GUPTA
doaj  

Demonstration of Multiple Access FSO Communication System Based on Silicon Optical Phased Array

open access: yesPhotonics
The silicon photonic optical phased array (OPA) has attracted enormous interest in free-space optical communication (FSO) owing to its high integration and agile beam steering.
Siwen Fan, Anpeng Song
doaj   +1 more source

Performance Comparison of FH/MC DS-CDMA with Single- and Multi-Carrier DS-CDMA

open access: yes, 2000
In this contribution we review the slow frequency hopping multicarrier direct-sequence code-division multiple-access (SFH/MC DS-CDMA). Then, the system's performance is ecalated and compared to that of the conventional single-carrier (SC) DS-CDMA and MC ...
Yang, L-L., Hanzo, L.
core   +1 more source

A Flexible Transmit Diversity Assisted Broadband Multicarrier DS-CDMA Scheme

open access: yes, 2002
In this contribution we identify some of the key problems that may be encountered when designing a broadband multiple-access -systems having bandwidth on the order of tens or even hundreds MHz We commence with a comparative discussion in terms of the ...
Yang, L-L., Hanzo, L.
core   +1 more source

Broadband Backhaul Communication for Stratospheric Platforms: The Stratospheric Optical Payload Experiment (STROPEX) [PDF]

open access: yes, 2006
A high bitrate optical downlink was performed by the stratospheric optical payload experiment (STROPEX), a part of the EU CAPANINA project. The STROPEX objectives were to design and build the necessary hardware to demonstrate an optical backhaul downlink
Knapek, Markus   +9 more
core   +1 more source

Performance of Generalized Multicarrier DS-CDMA over Nakagami-$m$ Fading Channels

open access: yes, 2002
A class of generalized multicarrier direct sequence code-division multiple-access (MC DS-CDMA) schemes is defined and its performance is considered over multipath Nakagamifading channels. The spacing between two adjacent subcarriers of the generalized MC
Yang, L-L., Hanzo, L.
core   +1 more source

Applications of Hadamard matrices

open access: yesJournal of Telecommunications and Information Technology, 2003
We present a number of applications of Hadamard matrices to signal processing, optical multiplexing, error correction coding, and design and analysis of statistics.
Haralambos Evangelaras   +2 more
doaj   +1 more source

Solving the Near-Far Problem in Dynamic Frequency Hopping-Optical Code Division Multiple Access using Power Control [PDF]

open access: yesIraqi Journal for Electrical and Electronic Engineering, 2011
In this study, a distributed power control algorithm is proposed for Dynamic Frequency Hopping Optical-CDMA (DFH-OCDMA) system. In general, the DFH-OCDMA can support higher number of simultaneous users compared to other OCDMA techniques.
Wamidh J. M. ALgalbi
doaj  

Two dimension MDW OCDMA code cross-correlation for reduction of phase induced intensity noise

open access: yesEPJ Web of Conferences, 2017
In this paper, we first review 2-D MDW code cross correlation equations and table to be improved significantly by using code correlation properties.
Sh. Ahmed Israa   +4 more
doaj   +1 more source

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