ORCID Profile
0000-0003-0808-2840
Current Organisation
International Islamic University Malaysia
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Publisher: IEEE
Date: 05-2010
Publisher: Wiley
Date: 17-01-2015
DOI: 10.1002/SAT.1071
Publisher: IEEE
Date: 10-2015
Publisher: IEEE
Date: 11-2018
Publisher: IOP Publishing
Date: 11-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2020
Publisher: IEEE
Date: 25-11-2020
Publisher: IEEE
Date: 05-2011
Publisher: IEEE
Date: 07-2016
Publisher: IEEE
Date: 05-2010
Publisher: IEEE
Date: 11-2013
Publisher: IEEE
Date: 09-2015
Publisher: IEEE
Date: 09-2015
Publisher: Blue Eyes Intelligence Engineering and Sciences Engineering and Sciences Publication - BEIESP
Date: 26-07-2019
DOI: 10.35940/IJITEE.F1238.0486S419
Abstract: In a communications system, a ersity technique is used to enhance the reliability of a message signal by using at least two channels with different characteristics. In this paper, all four possible scenarios are considered: Single-input and singleoutput (SISO), single input and multi-output (SIMO), multipleinput and single-output (MISO), Multiple-input and multiple output (MIMO) systems. Antenna arrays will be used to reduce BER and improve the performance of the system using array gain in the line of sight channel for 60 GHz frequency in an indoor scenario. Single input and single output are investigated before analysis of multiple inputs and multiple output channel in the line of sight (LOS) and multipath propagation. MATLAB simulation has been performed using BPSK modulation. The comparative studies show that the performance of the MIMO ersity technique is more reliable in terms of BER to improve the performance and efficiency of the communication system.
Publisher: IEEE
Date: 11-2015
Publisher: Blue Eyes Intelligence Engineering and Sciences Engineering and Sciences Publication - BEIESP
Date: 02-11-2019
DOI: 10.35940/IJRTE.B1588.0982S1119
Abstract: For future 5G wireless communication networks, millimeter-wave (mmWave) cellular systems is considered to be the key enabling technology because of its high data rates, low latency, high system capacity, and huge available bandwidths. However, multiuser networks in mmWave frequency bands encounter high path loss and interference, thus degrading the performance. Applying large antenna arrays at the base stations (BS) in order to achieve high beamforming gains with the help of precoding techniques is an efficient way of improving the performance of the system. Although multi-user beamforming can improve spectral efficiencies, full digital beamforming strategies used in the conventional microwave systems increase the hardware cost and consumes high power for large number of antennas in mmW systems. In this paper, a low-complexity multi-user hybrid precoding structure is proposed for mmWave multiple input multiple output (MIMO) channels utilizing Minimum Mean Square Error (MMSE) precoders at the BS with perfect channel knowledge. Simulations show that the achievable rate obtained by the proposed hybrid precoding scheme is very close to the single-user rate and also performs better compared to other hybrid precoding approaches.
Publisher: Elsevier BV
Date: 12-2013
Publisher: Institute of Advanced Engineering and Science
Date: 08-05-1970
Abstract: In this paper, a multiband stack series array antenna is designed in order to attain solutions for the future 28 GHz Ka-band application. Double layer substrate Technology is utilized to accomplish multiple resonant frequencies with higher data transfer capacities due to high bandwidth. The designed antenna is dependent on twofold layer consisting patches and resonators in different layers stacked together. The designed multiband antennas can resonate at single band of (28 GHz), dual band of (28 and 30 GHz) and triple band of (24.18, 26 and 28.453). The results achieved in the simulation are later fabricated and tested. The test result illustrates that the antennas have wide bandwidth, high gain and even higher efficiencies. All the proposed antenna configurations have demonstrated a decent possibility for 5G millimeter wave (mmwave) application.
Publisher: IEEE
Date: 09-2014
Publisher: IEEE
Date: 11-2015
Publisher: IEEE
Date: 11-2016
Publisher: IEEE
Date: 07-2012
Publisher: IEEE
Date: 08-2012
Publisher: Institute of Advanced Engineering and Science
Date: 09-2019
Abstract: Antenna array of large scale have been examined for different applications including 5G technology. To get better data rate or a reliable link substantial number of antenna arrays have been utilized to provide high multiplexing gains as well as array gains with high directivity. In this paper a simple but efficient implementation technique of using sub-arrays for the improvement of large-sized uniform arrays. By repeating a small sub-array multiple times large arrays can be designed. This implication of utilizing small array simplifies the design of a larger array which allows the designer to concentrate on the smaller sub-array before assembling larger arrays. So, by investigating the sub arrays the performance and radiation characteristics of large arrays can be anticipated. The array-factor for a planar sub-array of 2x2 (4 elements) is analyzed using Mat-lab software and then a large array is formed by placing the 2x2 sub-array indifferent configurations in a rectangular arrangements up to 8x8 planar array. And then the results are validated with CST (Computer simulation technology) simulation results.In this way the array-factors, directivities, HPBWs, and side lobes of the constructed large arrays are analyzed and associated with the small sub-array.
Location: No location found
No related grants have been discovered for Md Rafiqul Islam.