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Wireless sensor actor network (WSAN) adverts to the combination of mainly one coordinator node with two types of network nodes: sensors and actor nodes that communicate wirelessly to perform allotted sensing, monitoring and actuation chores. To provide effective and reliable WSAN performance, the coordinator node of a WSAN must be able to administrate the network, sensing nodes and synchronize the...
In this paper we present a novel code family for SAC-OCDMA system. The new code technique is called Dynamic Cyclic Shift (DCS) code. Which more flexible in selection the code length with variable cross correlation. Furthermore, incase of increasing the number of users there is no need to increase the weight value. In addition the code construction is very simple and easy in compare with the former...
Camera-based surveillance is an important technology to monitor people, assets and places, for the applications of increasing physical security. Access to information services whilst on the move is becoming increasingly prevalent within transport systems. This paper examines motorway vehicles equipped with wireless communication nodes to obtain images from the cameras distributed along a motorway...
This paper demonstrates the transmission performance of a subcarrier multiplexing over optical CDMA for a simple point-to-point network design. This integrated system is expected to improve the spectral efficiency and the channel data rate of the OCDMA network. The simulation is done using Optisys version 7.0. Spectral amplitude coding (SAC)-OCDMA is employed in this study because of its ability to...
In this paper, we will focus on the modulation format used to create the optical pulses, which are return-to-zero (RZ), and non-return-to-zero (NRZ). Bit error rate (BER) performance is evaluated based on double weight (DW) code. Optical code division multiple access (OCDMA) system is considered a promising technique for fiber-to-the-home (FTTH) access networks. The performance of RZ against NRZ is...
The study is reported the transmission of a spectral-sliced WDM channel at 1 Gbp/s over LAN with different channel spacing. A sliced channel designed as 1:8 slicing element is integrated, multiplexed, through SMF, and finally demultiplexed into 8 channels namely “spectral slicing” having same spacing bandwidth. The demultiplexer technique is used in WDM and the network applications can apply for Fiber-To-The-Home...
In this paper we propose a Zero Cross-correlation (ZCC) code in Optical Code Division Multiple Access (OCDMA) CDMA system based on amplitude spectral encoding of low-cost broadband sources such as Light Emitting Diode (LED). We also study how the sliced spectrum of LED can be used as a cost-effective light source in ZCC code. Our system requires only standard optical elements and simple direct-detection...
This paper described the design of multiple element of microstrip patch antenna array operating at 2.45 GHz for WLAN and 5.85 GHz for WiMAX applications. The design and development also focus on different type antenna such as rectangular and circular patch antennas. Microstrip antennas have the attractive features of low profile and light weight. However the antennas may be too large for practical...
In this paper the improved versions of modified demultiplexer operating for 16 channel multi users with and without EDFA are proposed for slicing WDM systems. The spectrum-sliced WDM channel operating at high data rate such as 155Mbps, 622Mbps, 1Gbps, and 1.25Gbps. By using the commercial optical system simulator “optisim”,we evaluate the one loop amplification into two Paris of fiber optics length...
A new class code structure for Spectral Amplitude Coding Optical Code Division Multiple Access (OCDMA) with zero cross-correlation is been proposed in this paper. The proposed code called Modified Zero Cross Correlation Code (MZCC) which evaluation from the existing Zero Cross Correlation Code. MZCC code provides much easier code construction, minimum code length with K number of users given any weight...
Free space optical communication system (FSO) is a potential solution for increasing bandwidth demands. The FSO has a capability to provide high speed data communication, economic and quick deployable. Although FSO has several advantages, but at the same time FSO faces a major challenge from scintillation introduced by atmospheric turbulence. In this paper, the simulation performance for the binary...
This paper investigates the performance of direct detection technique for zero cross correlation code in Optical Code Division Multiple Access (OCDMA) which is a better technique to reduce Multi Access Interference (MAI). MAI is the main reason for performance degradation in optical CDMA especially when large numbers of users are involved. The implementation of direct detection whereby only a pair...
This paper describes the performance evaluation of the Optical Code Division Multiple Access (OCDMA) technique using Double Weight (DW) Code. This technique was implemented in local area environment which is applied in ring network and the performance analysis was carried out using optical communication simulation software. Details of the simulation result on OCDMA in terms of bit error rate (BER),...
In this paper, we study the use of a new code called random diagonal (RD) code for spectral amplitude coding (SAC) optical code division multiple access (OCDMA) networks, using fiber Bragg-grating (FBG). FBG consists of a fiber segment whose index of reflection varies periodically along its length. RD code is constructed using a code level and data level, one of the important properties of this code...
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