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Optical biosensor basically referred to the development of sensor with the main principle of appropriate light source using the bio-recognition element. Development of optical bio-molecular device is a new move towards revolution of nano-bioelectronics. Optical biosensor is one of such nano-biomolecular devices that have a potential to pave a new dimension of research and device fabrication in the...
Nowadays, more and more wireless power transfer system are developed and being in used in many electronic devices especially in Smart Home applications. In this paper, we developed a basic and simple wireless electricity system to investigate and analysis the system performance. This system was developed using electrodynamic induction technique to demonstrate the wireless power transfer system. Moreover,...
For high data rate propagation and indoor obstacles in wireless ultra-wideband (UWB) communication systems, the signal fading and noises are influencing the performance of the wireless systems. In this paper, the rake-receiver was presented with the spread signal by time-hopping spread spectrum (TH-SS) technique. The adaptive filter used in rake-receiver structure was shown with adjusting the receiver...
Recently, many literatures were presented to mitigate the noises or to suppress inter-symbol interference (ISI) and inter-frame interference (IFI) with systems operate in time hopping spread spectrum. The structure of the conventional rake-receiver is more complex that based on large number of multiple paths in wireless ultra wideband (UWB) communication systems. In this paper we proposed low complexity...
The intent of this paper is to study the performance of spectral-amplitude coding optical code-division multiple-access (OCDMA) systems using Single Photodiode Detection (SPD) under various optical parameters. In our work, we utilized Modified Double weight (MDW) code as one of the OCDMA applications which called “triple-play” services (audio, video, and data) with different quality-of-service (QoS)...
In order to meet the ultra-high speed and ultra-long haul transmission distance in spectral amplitude coding optical code division multiple access (SAC-OCDMA) system, the dispersion impairment affecting the overall system performance should be minimized. In this paper, the transmission performance of SAC-OCDMA system is investigated based on single photodiode detection technique when a conventional...
The scattering and reflections that occur-during indoor propagation create serious problems for multi-path channel transmissions due to seriously suffering from plenty of resolvable multipath components (MPCs) through line of sight (LOS) and non-line of sight (NLOS) environments. This high-gain antenna can be used to evaluate indoor, single-in single-out (SISO) and multiple-in multiple-out (MIMO)...
the UWB is 7.5 GHz (from 3.1 GHz to 10.6 GHz) was defined by Federal Communications Commission (FCC) for high data rate wireless communication systems. This band needs special and active antenna for transmission and reception of wideband signals. So that, the design of UWB antenna plays very important role in indoor and outdoor wireless systems. Because of more challenges toward the wireless communication,...
In this paper, we present an effective encoder-decoder design utilizing Flexible Cross Correlation (FCC) code for Spectral Amplitude Coding-Optical Code Division Multiple Access (SAC-OCDMA) systems. The FCC code has advantages, such as flexibility cross-correlation property for any given number of users and weights, as well as effectively reduces the impacts of Multiple-Access Interference (MAI)....
A single photodiode detection (SPD) technique for interference suppression in spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems is investigated in this paper. Its benefits to eliminate multiple-access interference (MAI) and phase-induced intensity noise (PIIN) which are the major noises in incoherent SAC-OCDMA systems. We show the feasibility of SPD technique; however,...
A six-channel 2.4GHz subcarrier multiplexing - optical code division multiple access (SCM-OCDMA) system in conjunction with the selective excitation of LP01 and LP02 modes is presented for a multimode fiber Local Area Network. Simulation results demonstrate that mode selectivity increases the bandwidth-distance product and improves the BER performance of the channel.
Non-return-to-zero (NRZ) and return-to-zero (RZ) are two basic data formats in optical communication systems. In this paper, we compare the performance of NRZ against RZ with both AND as well as modified-AND subtraction detection techniques in spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems. Modified double-weight (MDW) codes are used as the signature codes for...
This paper examines the avalanche photodiode (APD) gain impact on spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems based single photodiode detection (SPD) technique. Numerical results are used for inspecting the APD gain influence upon the probability density function (PDF) and signal-to-noise ratio (SNR) performance. The usage of APD over positive-intrinsic-negative...
Optical Code Division Multiple Access (OCDMA) system are limited by the interference between users as well code length due to the code developments. A detailed of code construction for a OCDMA system with flexible cross correlation is presented to reduce the effect of interference thus optimizing the code length. In this paper, the proposed code called Flexible Cross Correlation (FCC) code. The FCC...
Progress in fiber optic technology have made long-haul communications systems reach distance that were once unheard of. This distance is made possible by using modulation techniques that do not require a complex link design which best applied in spectral-amplitude coding optical code-division multiple access (SAC-OCDMA) system. In this paper, we investigate the use of different detection schemes namely...
Free space optic (FSO) is considered as an attractive option to fiber optic. FSO has the capability to go beyond the limits of fiber optics. However, atmospheric turbulence causes fluctuations in the intensity of the received light signal, impairing link performance. In this paper, we describe a new technique to mitigate turbulence-induced intensity fluctuations, i.e., signal fading (under the effects...
The development of many high bit-rate multimedia applications has emphasized the demand for service differentiation or prioritization techniques to ensure end-user quality-of-service (QoS) necessities. This paper focuses on utilizing different detection schemes in spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems to support ‘triple-play’ services (voice, video, and...
This paper presented a code with non-zero in-phase cross- correlation Spectral Amplitude Coding Optical Code Division Multiple Access (OCDMA) system. The proposed code called Modified Non Zero Cross Correlation (MNZCC) code. The MNZCC code can be constructed easily for any given number of users, weights and cross correlation (λmax) using tridiagonal matrix properties. MNZCC code will be demonstrated...
This paper presented a new class of code called Modified Non-Zero Cross Correlation (MNZCC) Code for Spectral-Amplitude Coding Optical Code Division Multiple Access. The MNZCC code can be constructed easily for any given number of users, weights and cross correlation (λmax) with tridiagonal matrix properties. We find that the performance of MNZCC code is better than OCDMA codes such as MDW and MFH...
The rapid progress in video-based Internet applications is increasing the demand for efficient optical communication systems. In this paper, developed detection technique for incoherent spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems is presented. In order to tighten the correspondence between practical and theoretical results, the most dominant noises that might...
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