DWT-MCM based OQAM modulation scheme in the downlink transmission of wireless systems

2022 ◽  
Author(s):  
Yahya Jasim Harbi ◽  
Hayder Rafea Kareem Almosa ◽  
Ahmed Obaid Aftan
Keyword(s):  
Wireless Systems ◽  
Modulation Scheme ◽  
Downlink Transmission

scholarly journals Establishment Network by Using FSO Link Based on MD Code for Hybrid SCM-SAC-OCDMA Wireless System

2018 ◽  
Vol 8 (6) ◽  
pp. 5107
Author(s):  
Rashid Ali Fayadh ◽  
Mousa K. Wali ◽  
Mehdi F. Bonneya
Keyword(s):  
Mesh Networks ◽  
Wireless Systems ◽  
Wireless Channel ◽  
Mesh Network ◽  
Spectral Amplitude ◽  
Modulation Scheme ◽  
Atmospheric Effects ◽  
Free Space Optic ◽  
Spectral Amplitude Coding ◽  
Code Division Multiple

<p>Since the wireless systems are working under nature environments and influenced by turbulence, weather in Iraq that leads to extended amount of fading signal, dissipation or attenuation. Basic “hybrid Subcarrier Multiplying Spectral Amplitude Coding (SCM-SAC) of Optical Code Division Multiple Access (OCDMA)" indoor or outdoor optical system depends on generally “Multi-Diagonal (MD)" security code by using optical space known as “Free Space Optic (FSO)" that was proposed in this work. It is found that the mention hybrid wireless systems can be used in operating mesh networks. The main proposed idea of hybrid optical technique was analyzed and simulated by normally taking into simulation account that the directly effecting by rain and haze attenuations. In addition, there are mention and description for atmospheric effects, FSO mesh network, modulation scheme, simulation, and the data security. From simulation results, the hybrid system using MD code produces reduced “bit-error rate (BER)" at heavy storm rain to distance or range of 500 m and at drizzle rain up to 2500 m range. And also investigates the performance of using the proposed system with radio over fiber (RoF) for UWB signals through indoor propagation in building applications of wireless channel.</p>

Performance Evaluation of OFDM Wireless Systems using CAZAC Equalization

2018 ◽  
Vol 138 (3) ◽  
pp. 204-209
Author(s):  
Yushi Shirato ◽  
Ryota Ishioka ◽  
Masahiro Muraguchi
Keyword(s):  
Performance Evaluation ◽  
Wireless Systems

Improving Performance by Countering Human Body Shadowing in 60GHz Band Wireless Systems by Using Two Transmit and Two Receive Antennas

2016 ◽  
Vol E99.B (2) ◽  
pp. 422-429
Author(s):  
Tomoaki NAGAYAMA ◽  
Shigeki TAKEDA ◽  
Masahiro UMEHIRA ◽  
Kenichi KAGOSHIMA ◽  
Teruyuki MIYAJIMA
Keyword(s):  
Human Body ◽  
Wireless Systems

A Novel Turbo Coded Modulation Scheme for Deep Space Optical Communications

2010 ◽  
Vol E93.B (5) ◽  
pp. 1260-1263 ◽  
Author(s):  
Sangmok OH ◽  
Inho HWANG ◽  
Adrish BANERJEE ◽  
Jeong Woo LEE
Keyword(s):  
Optical Communications ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Deep Space ◽  
Turbo Coded Modulation
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