UWB Data rate and Channel Capacity in Modulation Schemes

2006 ◽  
Author(s):  
Omid Abedi ◽  
John Nielsen
Keyword(s):  
Channel Capacity ◽  
Data Rate ◽  
Modulation Schemes

Theoretical investigation of multiple input–multiple output (MIMO) technique for line of sight (LoS) underwater wireless optical communications system

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mustafa B. AL-Deen ◽  
Mazin Ali A. Ali ◽  
Zeyad A. Saleh
Keyword(s):  
Theoretical Investigation ◽  
Coastal Water ◽  
Multiple Input Multiple Output ◽  
Data Rate ◽  
The Other ◽  
Maximum Distance ◽  
Water Types ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Modulation Schemes

Abstract In this paper, a theoretical investigation was suggested to study underwater wireless optical communication (UWOC) system based on multiple input–multiple output (MIMO) technique. The modulation schemes such as RZ-OOK, NRZ-OOK, 32-PPM and 4-QAM applied under different coastal water types. MIMO technique enabled the system to transmit data rate with longer distance link. The performance of the proposed system examined by BER and data rate as a metrics. Several impairments such as the types of water by the attenuation of coastal water and the distance link were taken into account for the transmission of the optical signal to appreciate the reliability of the MIMO technique. The theoretical analysis shows the proposed of MIMO (4Tx/4Rx) technique get the better performance compared with the other techniques in terms of BER. When 32-PPM is applied as a modulation scheme. For the system with MIMO technique the maximum distance link arrive to 14.9 and 2.9 m for coastal water types JIC and J9C, respectively. While SISO (1Tx/1Rx) technique achieved the maximum distance link are 10 and 2.3 m for coastal water types JIC and J9C, respectively. Therefore, 32-PPM can outperform the other modulation schemes and consider the suitable option for obtaining a low BER with the best maximum distance link for LoS of MIMO technique.

scholarly journals Performance Research on Variable Data Rate Reconfigurable Architecture for SDR Receiver

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1008-1011
Keyword(s):  
Software Defined Radio ◽  
Data Rate ◽  
Reconfigurable Architecture ◽  
Bandwidth Efficiency ◽  
High Data ◽  
Modulation And Demodulation ◽  
Data Rates ◽  
Modulation Schemes ◽  
Variable Data ◽  
Amplitude And Frequency Modulation

In Early days, communications systems used amplitude and frequency modulation schemes in which bandwidth constraint is one of the major challenge to accommodate more data rates. As the data rate requirement increased drastically till date, The applications demands more data rates for communication using less bandwidth is considered as an efficient communication system. For achieving communication with high data rates using less bandwidth, technology migrated to digital modulation schemes. In this phase new modulation techniques like ASK, FSK, PSK were realised. ASK and FSK modulation schemes bandwidth efficiency is less as compared to PSK schemes. For best utilisation of bandwidth efficiency and less inherent noise levels, PSK schemes are used, which is suitable for high data rate applications. In this paper QPSK modulation and demodulation technique is selected for realising the variable data rate in the range of 1.2MBPS as the best bandwidth with efficient reconfigurable architecture designed for software defined radio receiver.

Seven-channel 1 Gbps TWDM coexistence architecture supporting 65 Gbps optical link for next-generation passive optical network 2-based FTTX access networks

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajendraprasad A. Pagare ◽  
Santosh Kumar ◽  
Abhilasha Mishra
Keyword(s):  
Channel Capacity ◽  
Wavelength Division Multiplexing ◽  
Optical Network ◽  
Access Network ◽  
Single Mode ◽  
Data Rate ◽  
Passive Optical Network ◽  
Q Factor ◽  
Next Generation ◽  
Wdm Pon

AbstractIn this paper, we have presented the design and simulation of a 7-channel next-generation passive optical network (NG-PON2) network for the deployment of Fiber-to-the-X (FTTX) access network. Coexistence architecture is proposed, designed and simulated for the implementation of NG-PON2 access network. In a coexistence architecture approach, legacy PON networks like Gigabit passive optical network (GPON) PON, 10GPON, etc. and wavelength division multiplexing (WDM)-PON supporting point-to-point connectivity are designed and simulated together. A 4 W 4 WDM-PON in which each channel carrying data at 2.5 Gbps data rate is capable of supporting a throughput channel capacity of 65.5 Gbps. NG-PON2 network is designed and simulated at 187.1, 187.2, 187.3 and 187.5 to 187.8 THz wavelengths in downstream direction for different link distances from 40 to 80 km looking into the requirement of reach of access network for future cities. The network performance parameters such as bit error rate (BER), quality factor (Q-factor), signal-to-noise ratio using the Optisystem-16 simulator at above data rates and link distances. Further, channel capacity estimation is done for single-mode fiber channel coexistence NG-PON2 configuration up to 80 km supporting BER e-13 and Q-factor 7 for WDM link and BER e-12 and Q-factor 7 for a legacy network supporting almost-1 Gbps data rate to 65 users and 100 Mbps to 512 user.

scholarly journals Improvement of bit error rate performance of MC-CDMA system by using adaptive digital modulation schemes

2018 ◽  
Vol 7 (3.3) ◽  
pp. 663
Author(s):  
Jaya T ◽  
M Monisha ◽  
M Meena ◽  
C Sharanya
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Adaptive Modulation ◽  
Data Rate ◽  
High Data Rate ◽  
Cdma System ◽  
Digital Modulation ◽  
High Data ◽  
Cdma Systems ◽  
Modulation Schemes

In Wireless Communication, the transmission channel suffers due to multipath propagation and channel dispersion due to Inter Symbol Interference (ISI), thereby degrades the system performance greatly. Future communication requires high data rate and effective utilization of bandwidth. Hence, there is a need to improve the Bit Error Rate (BER). The proposed work is Adaptive Modulation (AM), combined with Multi Carrier Code Division Multiple Access (MC-CDMA) based transmission system. It is a promising way to increase the data rate and it uses bandwidth in a efficient manner. The Adaptive Modulation based MC-CDMA systems applied to a wide-area environment, can achieve high data rate up to 100Mbps. In this paper M-ary PSK, M-ary QAM and M-ary CPM modulation techniques are used. The Adap-tive modulation based MC-CDMA systems perform well for around 10 number of users. As a whole, the adaptive MC-CDMA system is found to give the optimum BER performance of given digital modulation schemes for fourth generation environment.  

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