The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
MIMO-Constant Envelop Modulation (CEM) is a very power and complexity efficient system, which is introduced as alternative candidate to the currently used MIMO-Orthogonal Frequency Division Multiplexing (OFDM). CEM system enables to use high efficient nonlinear power amplifier on the transmitter side and 1 bit (low resolution) analog to digital converter (ADC) on the receiver side. Due to adopting...
The mechanisms of allocating the resources in Long Term Evolution (LTE) cellular networks are very critical issues, because scheduling algorithms have the main responsibility for determining how to allocate radio resources for different users. In this work a dynamically adopted Proportional Fair (PF) scheduling strategy for capacity enhancement of LTE system is proposed. Performance comparison with...
In this paper we introduce and asses the performance of a new scheduling algorithm based on Earliest Due Date (EDD) mechanism. Our proposed scheduling algorithm enhances the performance of Real-Time (RT) flows such as video and Voice Over Internet Protocol (VOIP) in Long Term Evolution (LTE) cellular networks especially in downlink. The proposed scheduling scheme provides the lowest Packet Loss Ratio...
Space-time adaptive processing and genetic algorithms are computationally intensive. So, processing schemes combining both of them may not be considered suitable for real time applications. This study presents a new fast multiple-beams direct data domain genetic algorithm beam-forming approach to space-time adaptive processing which enormously reduces the necessary number of computations compared...
Although OFDM has efficient spectrum usage, it still has about 25% of symbol time lost in the insertion of cyclic prefixes (CP) overhead between consecutive symbols for regarding Inter Symbol Interference (ISI). The proposed DFDM introduces spectral efficient multicarrier modulation scheme through getting rid of CP which represents loss in power and bandwidth, while accounting for ISI resulting from...
Nowadays ADC becomes more essential in emerging applications. ADC is starting to become hindrance to the system in the performance and the power consumption. For high-speed applications, pipelined and flash ADC has dominantly been used over the past decade. Technology scaling and the focus on digital systems with high-performance offer better time resolution by decreasing the gate delay. If the input...
Time-based-Analog-to-Digital-Converter (TADC) is an important block in various applications that require higher resolution and lower power consumption compared to the conventional ADCs at scaled CMOS technologies. In time-based ADCs, the input voltage is first converted into a pulse in time by using a Voltage-to-Time Converter (VTC) circuit, and then the pulse is converted to a digital output by using...
In this paper, the new testability analysis method of analogue circuits is presented. The observability of parametric faults is evaluated by determining a proper test signal that maximizes the error between the good and the faulty circuit at a target fault. The efficient method to optimize the multi-frequency test set by determining the basis of the decision matrix is presented. The decision matrix...
One of the most important problems of biomedical engineering is how to obtain realistic data of patients with different clinical situations because of the difficulty of finding unhealthy volunteers and getting ethical approval for any experimental test on patients. This paper presents a practical generator of heart sounds and murmurs for educational and research purposes. The developed generator produces...
Several literatures focused on self-testing of digital and analog integrated circuits. They proposed different test scenarios for the circuit board based on the signature analysis. The single-shot (SS) circuit is important element on the circuit board level in the industrial applications. In this paper, a new testing design is presented to functionally test the SS circuit on the circuit board. It...
This paper proposes a robust image watermarking approach using homomorphic based SVD in the DWT domain. The DWT is utilized to divide the host image into non-overlapping bands. The reflectance component of sub-band LL is extracted using homomorphic transform for each color (red, green and blue). The embedding watermark is done by applying SVD on the reflectance component of the sub-band LL. The results...
This paper introduces a fully automated approach for defect detection in patterned fabrics. First, the fabric pattern period is determined by calculating the image mean vectors in both horizontal and vertical directions. Second, Gray Level Co-occurrence matrices are calculated to both the reference defect-free image and defected image after dividing them to blocks that have the same dimension as the...
Digital watermarking technology is interested in solving the problem of copyright protection, data authentication, content identification, distribution, and duplication of the digital media due to the great developments in computers and Internet technology. Recently, protection of digital audio signals has taken a great attention from the researchers. This paper proposed a new audio watermarking scheme...
Speaker identification identifies the speaker among a set of users by matching against a set of voiceprints. In speaker identification, the identification time depends on the number of feature vectors, their dimensionality and the number of speakers. In this paper, text independent speaker identification model is developed by taking in MFCCs with VQ to obtain pressed feature vectors without losing...
In this paper, a new compact tunable microstrip-line fed slot antenna is proposed for interweave cognitive radio (CR) front end systems. The proposed antenna utilized four varactor diodes to control the antenna resonant frequency. The resonant frequency of the antenna can be electronically tuned by changing the effective electrical length of the resonant slot, which is accomplished by employing the...
A novel single element Eagle shape, and two element array (Ultra Wide Band) Eagle shape slotted microstrip antennas are presented. The antennas were designed and fabricated on a substrate with dielectric constant of 4.4, thickness of 1.6 mm, and tan δ = 0.02. A novel Eagle shape uni-planar compact electromagnetic band gap (UCEBG) cells are applied to reduce the mutual coupling between array elements...
In this paper a complete airborne system was proposed, which consists of two subsystems, the first one is airborne radar that can detect high speed air targets in all environments, and the second one is deception jammer source for countering the ground radars as a supported immunity system for the airborne radar. The novel airborne radar system can overcome the problems of range migration, Doppler...
In this paper, we present a simple, yet efficient, Multi-Band RF energy Harvesting (MB-RFH) circuit. The circuit overall dimension is (115 × 52 × 1.6) mm3 including the storage capacitor and operates over quad-band RF frequencies. Unlike the related works which use a separate antenna and a separate matching circuit per frequency band, we propose to use a single antenna and a single matching circuit...
Fairness measure is used in designing Operating System (OS) schedulers to determine whether users or applications are receiving a fair share of system resources. PS (proportional share) schedulers are the dominant schedulers in Virtual Machine (VM) environment. A PS scheduler assigns a weight to every VM to allocate CPU cycles, allocating these cycles to VM is proportional to that weight. Current...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.