| Manuscript Title: | Beam-forming and Beam-shaping in Smart Antenna-A Comparative Study between Least Mean Square and Recursive Least Square Algorithms |
| Manuscript Id: | IJMOT-2015-6-753 |
| Abstract: | This paper presents a comparative study of beam-forming techniques using least mean square (LMS) algorithm and recursive least square (RLS) algorithm. The accuracy of beam generation toward the direction of arrival (DOA) and null generation toward the interferer, depends on the value of step size parameter and forgetting factor, used in the algorithms. Beamwidth and side lobe levels (SLL) are also compared for these two algorithms for a uniform linear antenna array. |
| Authors: | Anupama Senapati, Jibendu Sekhar Roy |
| Submitted On: | 18/06/2015 |
| Pages: | 232-239 |
| Action: | [Full Paper]
No. of Downloads: 128 |
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| Manuscript Title: | Analysis and Design of Longitudinal Power Dividers/Combiners for Higher Frequencies |
| Manuscript Id: | IJMOT-2015-2-682 |
| Abstract: | A method of moment based analysis of longitudinal H-plane rectangular waveguide power dividers and combiners for high frequency application has been presented using Multi Cavity Modeling Technique (MCMT). The proposed power dividers/combiners can be used as H-plane tee. These longitudinal power dividers/combiners have good agreement with the MCMT and CST microwave studio simulated data. All these structures are well matched without any additional matching. For the Ku, K and Ka band operation these structures provide wide band responses. |
| Authors: | Debendra Kumar Panda, Ajay Chakraborty |
| Submitted On: | 09/02/2015 |
| Pages: | 240-244 |
| Action: | [Full Paper]
No. of Downloads: 55 |
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| Manuscript Title: | Implementation of a Miniaturized Single Element Co-axial Continuous Transverse Stub Antenna for Microwave Application |
| Manuscript Id: | IJMOT-2015-2-688 |
| Abstract: | This paper focuses on the simplified coaxial radial single stub antenna design. The proposed antenna structure was optimized using CST Microwave Studio Suite Software and verify the results using XFdtd software and finally fabricated the structure and measured the results using Network analyzer. The optimization of antenna design can be carried out over different thickness and dielectric materials using CST Microwave Studio Suite simulation software. The CST, XFdtd and measured results show that the return loss obtained is optimum. FDTD is a powerful method to solve complex structures and produce good results. The comparison should be made between these three results. Practical implementation shows that this proposed antenna structure could radiate at a resonant frequency of 2.9 GHz S-band applications. The reduction in thestub thickness can perform to achieve better results compared to large stub thickness. The fabricated antenna structure is well suitable for an S-band frequency band of 2.9 GHz, which can be very much useful for spacecraft satellite and missile consumer applications. |
| Authors: | P.Jothilakshmi, Dr.(Mrs).S. Raju |
| Submitted On: | 16/02/2015 |
| Pages: | 245-253 |
| Action: | [Full Paper]
No. of Downloads: 52 |
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| Manuscript Title: | ICI and PAPR Reduction of OFDM Systems Using IPMS Pulse |
| Manuscript Id: | IJMOT-2015-3-698 |
| Abstract: | In this paper, a novel transmitter side pulse shape has been proposed to reduce the average intercarrier interference (ICI) power and peak to average power (PAPR) ratio of Orthogonal Frequency Division Multiplexing (OFDM) systems. The results obtained show that the proposed pulse shape outperforms all recently proposed transmitter side pulse shapes in terms of ICI power reduction, signal to interference noise ratio (SINR) performance, and PAPR reduction. |
| Authors: | Pankaj K. Yadav, Vivek K. Dwivedi, Vikram Karwal, Jai P. Gupta |
| Submitted On: | 07/03/2015 |
| Pages: | 254-259 |
| Action: | [Full Paper]
No. of Downloads: 37 |
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| Manuscript Title: | Realization of Fractional Order Microwave Low Pass Filter |
| Manuscript Id: | IJMOT-2015-3-705 |
| Abstract: | A new technique is presented to improve the performance of any microwave filter in the fractional sense. In this technique, a relation is derived to obtain the values of conventional inductor and capacitor by equalizing the impedance in integer and in fractional sense, which behave as fractance device. Further, a maximally flat microwave low pass filter is considered to improve the performance of it. Then, the fractance devices for each element are simulated for improved performance by using the linear optimization method. Finally, the values of all conventional inductors and capacitors are obtained by using the derived relation, which behave as fractance devices. Results of this improved design are compared with the existing design to see the effectiveness of proposed technique. In last, the improved design of maximally flat microwave low pass filter is also realized by using microstrip lines. |
| Authors: | Dharmendra K. Upadhyay, Shalabh Kumar Mishra |
| Submitted On: | 25/03/2015 |
| Pages: | 260-265 |
| Action: | [Full Paper]
No. of Downloads: 77 |
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| Manuscript Title: | A Compact Tri-Band ACS-Fed Monopole Antenna With Mirror L-Shape Strips for WLAN/WiMAX Applications |
| Manuscript Id: | IJMOT-2015-5-728 |
| Abstract: | A simple, compact tri-band asymmetric coplanar strip (ACS)-fed antenna suitable for LTE 2300 MHz /WiBro, WLAN (IEEE 802.11b/g/a), WiMAX (IEEE 802.16) and ITU applications is proposed. By introducing two mirror L-shaped radiating branches (one meandered and one simple mirror L-shape) to a normal ACS-fed monopole structure, three resonant modes with wider impedance bandwidth characteristics can be excited independently. The antenna is designed and printed on a single-layer low-cost FR4 substrate having dimensions of 22 x 20 mm2 including the ground plane. The measured -10 dB impedance bandwidth of the proposed antenna are about 200 MHz (2.3-2.5 GHz), 2450 MHz (3.4-5.85 GHz), and 700 MHz (7.7-8.4 GHz) , which can cover 2.3 GHz LTE/WiBro, 2.4/5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX and 8 GHz ITU bands. Moreover good omnidirectional radiation patterns and stable peak gains are obtained across the operating bands. |
| Authors: | \r\n Praveen V. Naidu, Akshay Malhotra |
| Submitted On: | 04/05/2015 |
| Pages: | 266-273 |
| Action: | [Full Paper]
No. of Downloads: 126 |
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| Manuscript Title: | Broadband Planar Circular Loop Antenna |
| Manuscript Id: | IJMOT-2015-5-739 |
| Abstract: | In this paper, a broadband planar circular loop antenna for LTE femtocell base station is proposed. The proposed broadband planar loop antenna consists of two circular loops and a monopole strip. The antenna is fed by SMA coaxial connector. By combining the resonance of loop antenna and monopole strip, a broadband characteristic is achieved. The simulated and measured impedance bandwidth of the proposed antenna is 16.67 % (687-812 MHz) and 38.4 % (606-894 MHz) respectively for |S11|<-10 dB. The antenna achieves a broad bandwidth of 125 MHz which is nearly 13 times more compared to such antenna referred in the literature. Also, the antenna has stable radiation pattern across the entire frequency band. The gain of the antenna ranges from 3.90 to 5.81 dBi |
| Authors: | Idayachandran Govindanarayanan, Nakkeeran Rangaswamy |
| Submitted On: | 26/05/2015 |
| Pages: | 274-279 |
| Action: | [Full Paper]
No. of Downloads: 58 |
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| Manuscript Title: | Design of Undulate Cladding PCF for Dispersion Compensation over E+S+C+L Bands and Sensing Application |
| Manuscript Id: | IJMOT-2015-1-679 |
| Abstract: | This paper introduces a different cladding design of air-holes in a sequence of undulate lattice structure of photonic crystal fibre (PCF) with defected core structure using only circular air-holes. The proposed fiber has shown result of broadband dispersion compensation from 1350 nm to 1640 nm i.e. 290 nm wavelength where negative dispersion coefficient is - 260 ps/(nm.km) with an absolute dispersion variation of 4 ps/(nm.km) over E+S+C+L communication bands as well as a matched residual dispersion slope (RDS) which is equal to approximately 0.0036 nm-1 that of a single-mode fibre (SMF) at the operating wavelength of 1550 nm. This PCF also has a birefringence of 1.72×10-2 at the operating wavelength of 1550 nm. According to the simulated results this undulate cladding PCF can be considered as a good candidate for both dispersion compensating application in WDM system as well as in sensing applications. |
| Authors: | Md. Sharafat Ali, N. Ahmed, S. A. Aljunid,R. B. Ahmad, Matiur Rahman |
| Submitted On: | 31/01/2015 |
| Pages: | 280-287 |
| Action: | [Full Paper]
No. of Downloads: 38 |
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| Manuscript Title: | Performance Analysis of Multiple Input Multiple Output Free Space Optical Systems. |
| Manuscript Id: | IJMOT-2015-2-692 |
| Abstract: | The analysis of the multiple input multiple output (MIMO) Free Space Optical (FSO) communication system involving Webb distribution for APD-based optical receiver has been presented. The probabilistic analysis of the FSO channel, APDs and noise in the FSO systems has been carried out. The pulse position modulation (PPM) signaling detection and the transmitted symbol matrix for MIMO FSO equal gain combining systems are also analyzed. The average BEP decreases at a slower rate upto SNR = 15 dB where BEP is approximately 10?3 for PPM symbol length L= 4 and decreases for higher values of L. For APD gain M ? 70 the BEP is almost constant for any value of turbulence factor and has minimum temperature effect in this range. |
| Authors: | Xiaoyan Wang, Banmali S. Rawat, M. Sami Fadali, Moncef Tayahi |
| Submitted On: | 17/02/2015 |
| Pages: | 288-295 |
| Action: | [Full Paper]
No. of Downloads: 50 |
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| Manuscript Title: | Firefly algorithm for Optimal relay placement in wireless optical communication system |
| Manuscript Id: | IJMOT-2015-3-701 |
| Abstract: | Wireless optical communication[WOC] is a terrestrial line-of-sight (LOS) transmission through the atmosphere which transmits a modulated beam of visible or infrared light through the atmosphere for ground to satellite, satellite to satellite, satellite to ground and between high-rise buildings. WOC can transmit 10 Gbps of data, voice and video communications simultaneously through space at the speed of light. The atmospheric light wave propagation is considerably influenced by the random variations in the refractive index of air pockets .Spatial & temporal variations of air with respect to fluctuations in temperature & pressure of atmospheric termed as Atmospheric Turbulence cause random variation of refractive index results change in direction of propagation and degrades the performance of Wireless optical communication system. Multi-hop or Cooperative wireless optical communication Relay assisted transmission system can be the most suitable mitigation technique for this issue. |
| Authors: | Jabeena. A , Jayabarathi.T |
| Submitted On: | 10/03/2015 |
| Pages: | 296-300 |
| Action: | [Full Paper]
No. of Downloads: 43 |
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