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This paper explores the simulation design and transmission of a 60GHz mm-wave and Wi-Fi (IEEE 802.11n) transmission over a coupled long-haul Single Mode Fiber (SMF) and Multi-mode Fiber (MMF) to a residential station by utilizing optical carrier suppression (OCS) modulation at the central office. This topology includes the use of a dual drive Mach-Zehnder modulator (DD-MZM) to realize Remote Heterodyne...
The performance of energy detection (ED) technique is highly affected by the noise fluctuation which leads to degrade the cognitive radio (CR) system accuracy. Therefore, many methods have been proposed and designed to enhance the CR system performance. In this paper, an improvement for ED performance is achieved by using digital signal processing (DSP) for the primary user (PU) signal before taking...
This paper introduces the transmission of Wi-Fi (IEEE 802.1111) and LTE wireless channels over a coupled Single Mode Fiber (SMF) and Multi-mode Fiber (MMF) to the residential gateway using Optical Frequency Multiplication (OFM) at the central office. At the coupled SMF and MMF junction, an offset launch technique is applied to improve the signal bandwidth. The transportation of mm-wave frequencies...
This paper investigates the design of a low power consumption mm-wave radio-over-fiber transmission over 25km SMF and 30m MMF for in-door applications using a dual drive Mach-Zehnder modulator (DD-MZM) and WDM multiplexers. This architecture includes the generation of both a 60GHz mm-wave signal and a remote local oscillator (LO) for uplink transmission at the residential gateway by utilizing the...
The construction of light-trees is one of the principal sub-problems for all-optical multicast technology in wavelength division multiplexing (WDM) networks. In this paper a new algorithm proposed to maximize quality of service by minimizing dispersion on the converted wavelength. Network cost is significantly reduced by decreasing number of wavelengths and Number of wavelength converters utilized...
The low data rate ad hoc wireless sensor network over IEEE 802.15.4 protocol has been implemented as an alternative to overcome network bottleneck problem. Unlike IEEE 802.11 protocol that allows RTS/CTS method, the former protocol does not include mechanism to avoid hidden nodes problem. This paper elaborates an evaluation study of hidden nodes effect on the proposed network. Comparison study is...
The accuracy for any spectrum sensing technique in cognitive radio (CR) is affected by the transmission channel parameters such as the signal to noise ratio (SNR). In this paper, a special approach is used to estimate the SNR in the received primary user (PU) signal. This approach is based on using filter bank transform which is called hybrid slantlet transform (HST). This transform decomposes the...
In recent years, Wireless Mesh Networks (WMNs) considered as a practical solution for last-mile broadband wireless internet access. In this mode of wireless ad hoc networks, nodes may play the role of APs or Mesh Routers (MRs) to offer a short way to packets to find their destinations. However, as each node in WMNs has to transmit extra relayed traffic as well as its own; the capacity of such networks...
As Cognitive Radio (CR) technology is recently emerged as a potential solution to overcome the problem of spectrum scarcity, Cognitive Wireless Mesh Networks (CogMesh) have great potential for enhancing the performance of wireless networks and meeting the demands of future generation wireless applications. By utilizing the available frequency bands that are unutilized by primary (licensed) users,...
In order to have the benefits offered by Proactive Routing and Reactive Routing while reducing the undesirable effects of both respectively, Hybrid Routing is suggested to be used in ad-hoc and Mobile Ad-hoc Networks (MANETs). One such hybrid routing protocol is the Zone Routing Protocol (ZRP). ZRP attempts to reduce the initial route discovery delay in case of reactive routing, and the control traffic...
The idea of mass deployment of an Advanced Metering Infrastructure (AMI) for Smart Grids has been explored and evaluated in this paper. Since smart meters with a wireless interface that can connect to the utility provider's server via a backhaul network forms the basic building block of an AMI, it is a good paradigm for an M2M application in Smart Grids. The relevant standardization efforts by 3GPP...
High Data Rate (HDR) Meshed Wireless Personal Area Networks (MWPANs) primarily use TDMA as the medium access mechanism. The Mesh Piconet Coordinators (MPNCs) need to reserve channel time slots for inter cluster and intra cluster communication in a superframe shared by MPNCs in the transmission vicinity of each other. In case of distributed channel reservation schemes for single flows, the issues of...
Radio over Fiber (RoF) technology uses optical fiber links to distribute RF signals from a central station to multiple remote access units due to its ability to provide simple antenna front ends, increased capacity, and multi radio wireless access coverage. In this paper, an All-photonic Digital Radio over Fiber (DRoF) architecture is proposed and its performance is individually investigated in a...
A distance based power control scheme is proposed and developed for application-controlled handover (ACH) in wireless personal area network (WPAN). In this paper, a power efficient communications in the wired wireless synergy network environment that consists of 3G (UMTS) + WiMAX + WLAN + WPAN (UWB) and optical network has been developed. This paper presents an enhanced power controlled transmission...
This paper derives a simulation based comparison for UWBOFDM with different multipath channel models. Several multipath channel models such as (AWGN, Rayleigh and Rician) has been simulated and compared with a proposed hybrid combination of Rayleigh, Rician and AWGN to observe a realistic multipath faded environment. These cases are based on no fading and flat Rayleigh- fading, multiple-diversity...
Wimax (Worldwide Interoperability for Microwave Access) is a promising technology which can offer high speed data, voice and video service to the customer end, which is presently, dominated by the cable and digital subscriber line (DSL) technologies. The performance assessment of Wimax systems is dealt with. The biggest advantage of Broadband wireless application (BWA) over its wired competitors is...
Data conversion is the bottleneck of today's communications to get the maximum efficiency with the least possible costs. Since most of the signals are naturally continuous in both time and amplitude, the Analogue to Digital (A/D) interface should be considered to be a challenging section of the processing system. Furthermore, Photonic Analogue to Digital Converter (PADC) is a critical component to...
Photonic analogue-to-digital converters (ADCs) by using a Mode-Locked Laser Diode (MLLD) scale the sampling timing jitter to femtosecond. Pipeline ADC's architecture has good performance in terms of speed and conversion latency. In this paper, an eight-bit pipeline time-interleaved all-photonic sampling and quantization ADC with a MLLD's sampling pulse period duration conversion latency is proposed...
The optical and wireless communication systems convergence will activate the potential capacity of photonic technology for providing the expected growth in interactive video, voice communication and data traffic services that are cost effective and a green communication service. The last decade growth of the broadband internet projects the number of active users will grow to over 2 billion globally...
The IEEE 802.11 standard conformant wireless communication stations have multi-rate transmission capability. To achieve greater communication efficiency, multi-rate capable stations use rate-adaptation to select appropriate transmission rate according to variations in the channel quality. This paper proposes a novel rate-adaptation scheme where the decision of rate selection relies on the mutual feedback...
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