Papers by Rasim Azeez Kadhim
Congestion Control in VANETs based on Message Rate Adaptation by the Exponential Function
2022 5th International Seminar on Research of Information Technology and Intelligent Systems (ISRITI)
A Survey of Congestion Control in Vehicular Ad-Hoc Networks(VANET)
2022 Iraqi International Conference on Communication and Information Technologies (IICCIT)
Variable length adjacent partitioning for PTS based PAPR reduction of OFDM signal
Peak-to-Average power ratio (PAPR) is a major drawback in OFDM communication. It leads the power ... more Peak-to-Average power ratio (PAPR) is a major drawback in OFDM communication. It leads the power amplifier into nonlinear region operation resulting into loss of data integrity. As such, there is a strong motivation to find techniques to reduce PAPR. Partial Transmit Sequence (PTS) is an attractive scheme for this purpose. Judicious partitioning the OFDM data frame into disjoint subsets is a pivotal component of any PTS scheme. Out of the existing partitioning techniques, adjacent partitioning is characterized by an attractive trade-off between cost and performance. With an aim of determining effects of length variability of adjacent partitions, we performed an investigation into the performances of a variable length adjacent partitioning (VL-AP) and fixed length adjacent partitioning in comparison with other partitioning schemes such as pseudorandom partitioning. Simulation results with different modulation and partitioning scenarios showed that fixed length adjacent partition had better performance compared to variable length adjacent partitioning. As expected, simulation results showed a slightly better performance of pseudorandom partitioning technique compared to fixed and variable adjacent partitioning schemes. However, as the pseudorandom technique incurs high computational complexities, adjacent partitioning schemes were still seen as favorable candidates for PAPR reduction.
Iraqi Journal for Electrical And Electronic Engineering, 2011
In this research we study the elevations of cities and the water resources specially at the dams ... more In this research we study the elevations of cities and the water resources specially at the dams reservoirs and the distance between them(dams & cities), we use the Google Earth program to determine these elevations and calculate the difference between the average level (elevation) of water at the dam and the average level of cities, which we want to supply it by water, in order to save electrical power by using the energy of supplied water through pipe line from dams to the cities, the pressure of supplied water must be calculated from the difference in elevations(head). The saving of energy can be achieved by two ways. The first is the energy saving by reduce the consumed power in the pumping water from river, which is used for different purposes. The second is the hydroelectric power generated by establishing a micro hydroelectric generator on the pipe line of the water supplied.
In this paper, we propose a three dimensional (3-D) codes namely 3-D perfect difference/ multi di... more In this paper, we propose a three dimensional (3-D) codes namely 3-D perfect difference/ multi diagonal (3-D PD/MD) code for spectral/time/spatial optical code division multiple access (OCDMA) system based on the perfect difference and multi diagonal codes. The multi-access interference (MAI) is fully eliminated in the receiver based on this code. The system performance is analyzed mathematically based on the proposed code under the consideration of the receiver noises, and compared with the systems of , 2-D perfect difference (2-D PD), 2-D diluted perfect difference (2-D DPD) and 3-D perfect difference (3-D PD) code. The proposed code reduces the receiver noises by reducing the receiver complexity to 50% of the 3-D PD code. In addition to that, the mathematical results shows that the 3-D PD/MD code system can accommodate more active users at a bit error rate (BER) of (10 -9 ) and data rates of 0.622Gbps and 1.25Gbps. Hence, the proposed system can be more applicable than the former...
Modeling and performance evaluation of antennas coated using monolayer graphene in the millimeter and sub‐millimeter wave bands
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 2021
Investigation the Receiver Complexity of a Three-Dimensional OCDMA System Based on Different Codes
Steganography is the science of hiding information that involves all the techniques used to excha... more Steganography is the science of hiding information that involves all the techniques used to exchange the secret message with low distortion of the cover medium. Many different cover medium formats such as (image, audio, video, and text) can be used to hide the secret message. Image files are mostly used because of their frequency on the Internet. Some of the old techniques used schemes to hide information are: invisible ink, null ciphers, micro-codes, and pink-pricks. Modern Steganography has gained a lot of attention for the last two decades because of the rapid growth of communication technologies such as Internet and the need of a secure channel to transmit the important information. In this paper, a concept of image steganography is explained and a review of recent image steganography methods and its applications is presented.
Water pollution is big problem in the world. The objective of this study was to modify Modified H... more Water pollution is big problem in the world. The objective of this study was to modify Modified Hopfield Neural Network Algorithm (MHNNA) with remote sensing image for water quality mapping. The using of remote sensing technologies for environmental monitoring gives a low-cost, reducing time, low efforts. Without using the traditional ship sampling method for environmental monitoring that requires a high survey cost, long time consuming, and exerting great efforts. In this study we classify one of the water pollutants which is chlorophyll of polluted water in Penang strait, Malaysia by applying (MHNNA) on THEOS (Thailand Earth Observation System) image. This done after modifying Hopfield neural network to be appropriate with color images such as satellite images. The collected samples from study area were simultaneously with the image acquisition by the airborne. The samples locations were determined by usage of a handheld global positioning system (GPS), and the measurement of chlo...
A new two dimensional spectral/spatial multi-diagonal code for noncoherent optical code division multiple access (OCDMA) systems
A new two dimensional codes family, namely two dimensional multi-diagonal (2D-MD) codes, is propo... more A new two dimensional codes family, namely two dimensional multi-diagonal (2D-MD) codes, is proposed for spectral/spatial non-coherent OCDMA systems based on the one dimensional MD code. Since the MD code has the property of zero cross correlation, the proposed 2D-MD code also has this property. So that, the multi-access interference (MAI) is fully eliminated and the phase induced intensity noise (PIIN) is suppressed with the proposed code. Code performance is analyzed in terms of bit error rate (BER) while considering the effect of shot noise, PIIN, and thermal noise. The performance of the proposed code is compared with the related MD, modified quadratic congruence (MQC), two dimensional perfect difference (2D-PD) and two dimensional diluted perfect difference (2D-DPD) codes. The analytical and the simulation results reveal that the proposed 2D-MD code outperforms the other codes. Moreover, a large number of simultaneous users can be accommodated at low BER and high data rate.
Modeling and Performance Assessment of a Millimeter-Wave CVD Film-Graphene Based Antenna
The transfer of graphene onto dielectric substrates to form an antenna needs to be performed with... more The transfer of graphene onto dielectric substrates to form an antenna needs to be performed with care, as tears and cracks may appear on the samples transferred improperly. This paper studies a detailed method in estimating the performance of a millimeter-wave (MMW) antenna built using commercially-available graphene layers. In contrast to the widely studied monolayer graphene, the proposed antenna is produced based on the chemical vapor deposition (CVD) technique, which is to be secured onto the antenna substrate via adhesive material without removal of the transition metal substrate from the graphene layer sample. The antenna performance modeled using this technique indicated quite similar results to a model using ideal monolayer graphene in terms of gain, radiated power and radiation efficiency. Its performance benchmarked against a copper antenna operating at the same MMW frequency also indicated similar performance improvements as with another antenna designed using monolayer ...
Hydro Power
Energy Conservation, 2012
Effect of partition length variability on the performance of adjacent partitioing PTS in papr reduction of OFDM systems
2014 IEEE Symposium on Computer Applications and Industrial Electronics (ISCAIE), 2014
Review on two dimensional code of noncoherent OCDMA systems
2014 IEEE International Conference on Control System, Computing and Engineering (ICCSCE 2014), 2014
Performance of PTS techniques with varied partition size in PAPR reduction of OFDM system
2014 International Conference on Computer, Communications, and Control Technology (I4CT), 2014
A new two dimensional spectral/spatial multi-diagonal code for noncoherent optical code division multiple access (OCDMA) systems
Optics Communications, 2014
A new two dimensional spectral/spatial multi-diagonal code for noncoherent optical code division multiple access (OCDMA) systems
Optics Communications, 2014
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Papers by Rasim Azeez Kadhim