Performances enhancement of underwater wireless optical communications (UWOC) using pulse position modulation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chahinaz Kandouci
Keyword(s):  
Optical Communications ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Pulse Position Modulation ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Modulation Type ◽  
Transmission Link ◽  
Wireless Optical Communications ◽  
Code Division Multiple

Abstract In this work, we study the performance analysis of underwater optical wireless communication (UOWC) transmission link by incorporating optical code division multiple access (OCDMA) using pulse position modulation (PPM) to enhance the channel range and cardinality. Bit error rate (BER) variations are examined versus the range, modulation type (on–off keying (OOK), quadrature amplitude modulation (QAM), etc.), number of users as well as the channel attenuation caused by different water types. The power and transmitter inclination angle limitation, of the enhanced system, are also presented in order to determine the threshold for which the minimum BER 10−9 is achievable.

SAC-OCDMA over Indoor Optical Wireless Communication (OWC) System Based on Zero Cross Correlation (ZCC) Code

2016 ◽  
Vol 857 ◽  
pp. 603-607 ◽  
Author(s):  
Emad Ahmed Alyan ◽  
S.A. Aljunid ◽  
M.S. Anuar ◽  
C.B.M. Rashidi
Keyword(s):  
Wireless Communication ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
High Speed ◽  
Cross Correlation ◽  
Spectral Amplitude ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Code Division Multiple ◽  
Indoor Optical Wireless Communication

This article investigates the spectral amplitude coding, optical code division multiple access (SAC-OCDMA) over indoor optical wireless communication (WO) system for various data rates and different receiver’s positions under the effect of ambient light noise. OW technology offers high speed communication with high level of security during data transmission. But it suffers from the multiple access interference (MAI) and phase induced intensity noise (PIIN) when the system associated with simultaneous multiple users. Therefore, the optical code division multiple access (OCDMA) technology is used based on zero cross correlation (ZCC) code in order to reduce those impairments that existed in OWC systems. The major advantage of ZCC code is its ability to eliminate the PIIN, thus minimize the MAI. The results show that at a bit error rate (BER) of 10-9, the system has the ability to perform at a transmission rate up to 1.2 Gbps. It also offers an excellent degree of mobility at all positions within the room at a data rate of 622 Mbps.

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