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This paper presents a central base station (CBS) for radio over fiber (RoF) downlink system at 2.4 GHz. CBS is designed to replace the function of switching room in complex signal processing, which offers conversion and distribution at low cost, simple, and efficient system. The received optical signal at CBS from internet service provider (ISP) propagates through fiber cable to radio frequency (RF)...
This paper presents the design of a fiber drop point (FDP) for optical — wireless access. The FDP uses Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) to increase the transmission speed more than 54Mbps. FDP will provide high-speed broadband services to indoor users. The FDP is simulated using OptiSystem software. The analysis of constellation diagram is carried...
This paper proposes a backup system for optical backhaul using Wireless Local Area Network (WLAN) 802.11n with Multiple-Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) techniques. This backup system is needed in order to make sure the communication networks can still work when the optical network breakdown occured. The system is simulated and analysed using OptiSystem...
A microstrip-fed broadband printed monopole antenna covering 1.7 – 6.0 GHz is miniaturized using half-cut technique, and arranged in pair for uplink/downlink microwave-photonic access point. This paper discusses the effect of the miniaturization to S11 and radiation pattern of individual antenna, and also the best choice of antenna pair, ground-plane type, and total width of the access point.
This paper presents a wideband photonic antenna consisting the laser diode, matching circuit, RF amplifier and microstrip patch antenna are fabricated and connected together to perform in uplink system. Laser driver is used to supply the dc biasing for the laser. Lastly, the LD-matching circuit, RF amplifier and antenna were arrange together and connected to perform the wireless uplink system. The...
This paper presents an active photonic antenna concept whereby an interface circuit is introduced in order to integrate the antenna with the photodiode. The operating frequencies ranges are 1.8 to 3.5 GHz which support the GSM 1800, WLAN and WiMAX applications. The simulated and measured results of interface circuit and antenna are presented. Thus, the photonic antenna is developed by integrating...
Active photonic antenna (APhA) designed for 2.4 GHz communication in downlink side is proposed. The APhA consists of photodiode, RF amplifier and band pass filter (BPF) in small package, integrated with RF antenna. The APhA design is simulated using optical communication simulation software at varied fiber length and free space loss (FSL). Performance improvement over passive photonic antenna (PPhA)...
Due to its low propagation loss, large bandwidth, and competitive cost, optical fiber become one of the best solution for the backhaul. However, new fiber network deployment is still very expensive in outdoor and rural environment. This paper proposes and evaluates design of 5.8 GHz photonic antenna in a radio over fiber system for point-to-point applications. Simulation result shows that the proposed...
Antenna return loss and gain as function of frequency are not readily accommodated in many communication system software. This paper proposes solution to the problem by representing the antenna in two-port network s-parameter. The representation exploits the analogy between antenna and two port network. Simulation using communication system software shows that the proposed method is validated.
Ultra high-speed optical network is developing rapidly as growing capacity demand in telecommunication system is increasing. In these networks, it is desired to carry out switching, routing and processing in optical domain to avoid bottlenecks of optoelectronic conversions. Optical time-division multiplexing (OTDM) technique is one option to implement all optical networks. It provides a single data...
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