Khaled Mahbub Morshed

Macquarie University · Department of Engineering

Beam-switching is one of the paramount focuses of 28 GHz millimeter-wave 5G devices. In this paper, a one-dimensional (1D) pattern reconfigurable leaky-wave antenna (LWA) was investigated and developed for wireless terminals. In order to provide a cost-effective solution, a uniform half-width LWA was used. The 1D beam-switching LWA was designed usi...

Two novel antennas are presented for mobile devices to enable them to access both licensed shared access (LSA) bands (1452–1492 and 2300–2400 MHz) and all the long-term evolution (LTE) mid (1427–2690 MHz) and high (3400–3800 MHz) bands, together with the GSM1800, GSM1900, UMTS, and 3.3 GHz WiMAX bands. These antennas do not require any passive or a...

A compact and low-profile wearable antenna for wireless body area network devices operating at 5.8 GHz ISM band is presented. The dimensions of the antenna are 9.5 mm × 16 mm with a wide impedance bandwidth of 650 MHz (5.42–6.07 GHz). Dimensions of the antenna are optimized using CST Microwave Studio. The antenna has a high directive gain of 6.9 dB...

A simple planar antenna of high gain for long term evolution (LTE), global system for mobile communications (GSM), Bluetooth, worldwide interoperability for microwave access (WiMAX), digital cellular services (DCS), personal communication services (PCS), wireless local area network (WLAN), and global positioning system (GPS) mobile terminals is pre...

A new type of antenna is presented in this paper. The main structure is a slot-loaded microstrip patch antenna fed by a half-width microstrip line. Two different types of antenna structure are combined together to make a single element antenna, and the radiation properties of both antennas are utilized in the proposed highly efficient antenna. Radi...

This paper studies code design for lossless compression with coded side-information for uniform binary sources with symmetric correlation. We propose LDPC codes for binning and convolutional codes for coding the side-information, and we present two strategies to design the codes. We further investigate the rate gaps due to the imperfections of the...

In this paper a compact dual L-slit slotted microstrip antenna for entire unlicensed national information infrastructure (UNII) band (UNII low 5.15-5.25 GHz, UNII mid 5.25-5.35 GHz, UNII worldwide 5.47-5.725 GHz and UNII upper 5.725-5.825 GHz) is proposed. This compact (15 × 9 mm size) antenna has good characteristics to cover UNII band for 5.2 GHz...

A simple structured planar wire antenna for WiMAX, Wi-Fi, WLAN, Bluetooth and satellite communication applications is presented. The antenna has four significant frequency bands with bandwidth of 194 MHz (2.956 - 3.15 GHz), 454 MHz (5.196 - 5.65 GHz), 79 MHz (6.538 - 6.617 GHz), and 424 MHz (12.812 - 13.236 GHz). The antenna is assumed to be feed b...

This paper presents a reconfigurable system that can encrypt digital data. The system provides the option of choosing one of familiar encryption methods DES, 3 DES and AES to the user. All these methods are symmetric type block cipher cryptography. DES takes 64 bit key to encrypt each 64 bits block of the entire message. AES on the contrary takes 1...

An inverted U shaped free space antenna is developed in YZ plane to achieve a bandwidth of 83MHz from 873MHz to 956MHz at 914 MHz resonance frequency with 1.82dB forward gain and -36dB reflection coefficient for ISM band and GSM-900 application. This proposed antenna also operates at 2.6 GHz for S-DMB application. The key configuration of the propo...

This paper presents a novel low profile inverted-FL antenna (IFLA) for worldwide interoperability for microwave access (WiMAX) applications by means of numerical simulation. The antenna has compact size of 9×20 mm2 and provides a wide bandwidth of 750 MHz (5150~5900 MHz) which covers the 5.5 GHz WiMAX applications. Moreover it has very high peak ga...

A high gain two elements inverted-L antenna (ILA) capable of generating two bands for 2.3 GHz mobile worldwide interoperability for microwave access (mobile WiMAX) and 5.5 GHz wireless-fidelity (Wi-Fi) operation is presented in this research. Geometry parameters of the antenna are optimized for 50 Ω antenna input impedance using method of moments (...

This paper presents compact ultra-wideband (UWB) LLI-slit slotted antenna for 5.2 GHz WLAN, 5.5 GHz Wi-Fi, and 5.8 GHz WLAN and Bluetooth operations. The proposed antenna provide a wide operating bandwidth of 1.9 GHz (4.85 - 6.75 GHz), thus allowing it to easily cover the required bandwidths for WLAN, Wi-Fi and Bluetooth operation in the 5.15-5.35/...

This paper presents efficient motion detection of mobile node (MN) based on weighted momentum of received signal strength (WMRSS) in support of better handoff management in wireless network. In this method, for making momentum of received signal strength (MRSS) more accurate in detecting motion of MN, weight is applied to the received signal streng...

This paper presents impedance matched high gain inverted-L antenna (ILA) and stair ILA for 5 GHz wireless local area network (WLAN) by means of numerical and experimental analysis. Numerical simulation is carried out using method of moments in Numerical Electromagnetic Code (NEC-2) and agilent vector network analyzer, watts antenna trainer, and mic...

Multiband loaded inverted-F antennas (LIFA’s) suitable to be applied in aportable device as an internal antenna having high gain property for mobileWiMAX, Wi-Fi, Bluetooth and WLAN operation are presented. The proposedantennas are directly feed by 50 Ω coaxial connector. The antenna armseffectively control the excited resonant modes for the require...

A millimeter band microstrip patch antenna was developed to achieve a bandwidth of 2GHz from 58.995 GHz to 60.995 GHz with linear polarization capability. In this paper the key configuration of the antenna consists of two loops having an opening at opposite side. The bandwidth of the antenna is enhanced by taking the advantage of this double loop a...

This paper presents the numerical simulations of inverted-L and stair inverted-L antennas capable of generating high gain with less than 1.5 dBi gain variation within the -10 dB return loss bandwidth for 5.5 GHz wireless-fidelity (Wi-Fi) operation with and without resistor-inductor-capacitor (RLC) impedance matching network. Moreover, the proposed...

This paper describes a direct detection optical receiver for demodulating optical signals. A theoretical analysis is provided for an optical communication system that connects two nodes. The analysis is carried out for a single mode fiber having fiber loss of 0.2 dB/km. preferably theoretical results are presented at a data rate of 5 Gbit/s, bit er...

A theoretical analysis is provided for an optical communication system that connects two nodes as well as a set of nodes with cascaded EDFA's. Preferably theoretical results are presented at a data rate of 5Gbps, bit error rate 10-9, by considering direct detection and coherent detection techniques for p-i-n and APD detectors. In this paper, noise...

This paper is about the performance analysis of a speech coder and how speech quality is dependent on excitation codebook and minimizing the bit-rate while preserving a certain quality of speech signal, or to improve speech quality at a certain moderately bit rate. A Code Excited Linear Prediction (CELP) procedure is developed to allow its implemen...

This paper analyze the Gaussian approximation for spread spectrum contains detailed mathematical analysis which provides expressions for determining the average bit error rate for users in a single channel, CDMA mobile radio network system. Using the expressions it is possible to analyze CDMA network systems for a wide range of interference conditi...

This paper addresses the numerical simulations of Inverted-F and loaded inverted-F antennas for improving the performance of 2.4 GHz industrial, scientific and medical (ISM) band applications. The proposed antennas are directly feed by coaxial connector and the antenna arms effectively control the excited resonant modes for the required operation....