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In the fifth generation (5G), it is anticipated that device-to-device (D2D) operation will be locally incorporated as a part without any bounds. In D2D network, multiple devices coexisting is a challenging subject of device discovery. The device discovery is performed under a visually impaired situation such as channel information, location, and the number of devices. In this paper, centralized device...
A single patch microstrip grid array antenna is presented. The proposed antenna is designed in rectangular diamond shape with dimension of 34 mm × 35 mm in width and length respectively. Rogers 5880 with a low relative permittivity of 2.2 is used as substrate with the thickness of 0.508 mm. The proposed microstrip grid array antenna successfully enhanced the antenna gain up to 11.32 dBi compared to...
A few years after the early investigation on ultra-wideband (UWB) wireless system, considerable research efforts have been put into the design of UWB antennas and systems for communications. These UWB antennas are essential for providing wireless wideband communications over very short distances at very low power densities. This chapter presents numerical analysis of a small slotted UWB antenna by...
A 4 × 2 array antenna is developed using a new nanocomposite polymeric magneto-dielectric substrate. The permittivity and permeability factors have been accounted in designing the proposed array antenna at the frequency of 2.6 GHz. A pure polydimethylsiloxane (P-PDMS) (εr = 2.7) solution is mixed with ferrite III oxide (μr = 1...
In this paper, time dispersion analysis for ultrawideband (UWB) channel is presented. The time dispersion analysis can be exploited for designing a better adaptive communication system and to define the channel behavior. we conducted channel measurements in an outdoor environment for line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios. Based on these measurements, the root-mean-squared (RMS)...
An experimental characterization of the ultrawide-band (UWB) channel in an outdoor environment over the frequency range from 3.1 GHz to 5.3 GHz is presented in this paper. The measurements are taken in time domain and line-of-sight (LOS). The statistical model for the delay spread is characterized and there is no correlation between delay spread and transmitter receiver distance. Different statistical...
In wireless communication system, the design and performance evaluation of any transceiver can be achieved with the aid of an approximate channel model. Since, there are different communication channels with dedicated transceiver structure and signaling, the availability of a generic channel model for the entire channels is very useful. This paper presents the development of wireless channel simulator...
In this paper, an approach in predicting surface roughness of Titanium Aluminum Nitrite (TiN) coatings using Adaptive Network Based Fuzzy Inference System (ANFIS) is implemented. The TiN coatings were coated on tungsten carbide (WC) using Physical Vapor Deposition (PVD) magnetron sputtering process. The N2 pressure, argon pressure and turntable speed were selected as the input parameters and the surface...
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...
In this study, we propose applying non-uniform biasing current technique to improve the gain uniformity of the semiconductor optical amplifier (SOA) for high-speed optical routers. The output pulses will have high-gain deviation because of the high-speed input pulses and the slow SOA gain recovery, thus resulting in a high system power penalty. The theoretical SOA operation principle is demonstrated...
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.
In this paper, we propose using an input packet with multiple wavelengths to achieve semiconductor optical amplifier (SOA) gain uniformity for high speed optical applications. Rapid SOA gain recovery is a key factor to minimise the output gain standard deviation which results in reducing the system penalties. The SOA is modelled using a segmentation scheme and its theoretical analysis is presented...
The design and deployment of efficient vehicle-to-vehicle (V2V) communications systems require the knowledge of the propagation channel in which it will operate. Due to the mobility of the transmitter/receiver terminals as well as the existence of dynamic scatterers, the V2V channel is nonstationary. To account for the nonstationarity, channel characterization methods that employs the non wide-sense...
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...
In this paper, the research work is focused on investigation of current distribution behaviour for various T slotted antennas. The geometry of the antenna implies the current courses and makes it possible to identify active and neutral zones in the antenna, thus it will be possible to fix which elements will act on each characteristic. Acting on matching and radiating areas allows controlling 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...
This paper investigates the impact of a train of input Gaussian pulses wavelength on semiconductor optical amplifier (SOA) gain uniformity for high speed applications. In high speed applications, the linear output gain of the input pulses is necessary in order to minimize the gain standard deviation and power penalties. A segmentation model of the SOA is demonstrated to utilize the complete rate equations...
In this paper, we propose a non-uniform biasing technique to improve the uniformity of the semiconductor optical amplifier (SOA) gain for ultra-high speed applications. In ultra-high speed applications, rapid gain recovery of the SOA is necessary to minimize the gain standard deviation and thus reducing system power penalties. A triangular shape biasing current is used in order to accelerate the SOA...
In digital transmission, the incoming data sequence is modulated onto a carrier with fixed frequency limits that are imposed by a bandpass channel. This modulation process involves switching the amplitude, frequency or phase of the Fourier basis, the sinusoidal carrier in accordance with the incoming data stream. Presented is a new technique which uses wavelet function as the signaling waveform where...
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