Wireless Communication

Falguni Raval ¹, Y. P. Kosta ², Amit V. Patel ¹, Dhara Patel ¹

Affiliations
1 Department of Electronics and Communication Engineering, Charotar University of Science and Technology, Changa, Pin: 388 421, Gujarat, IN
2 Mawadi Education Foundation’s Group of Institutions, Rajkot Morbi Road, At & PO Gauridad 360003, IN

Abstract

This paper proposes Microstrip Rectangular Patch Antenna in which metamaterial properties applied at ground Plane. The paper also analyzed the performance of Microstrip Patch Antenna with and1 without using the metamaterial structure at 10 GHz. The works mainly include Metamaterial as Defected ground plane. The Open Slot Split Ring resonator is used as metamaterial. The effective permeability parameters are retrieved from s parameters for unit cell Split Ring Resonator, revealing the presence of magnetic resonances around resonance frequency 10 GHz. All antenna parameters such as Return Loss, Gain, and Band width were checked. The main focus of this paper was to check the effect of metamaterial so that Patch antenna used for multi band operation.

Keywords

Defected Ground Plane (DGP), Open Slot Split Ring Resonator (OSSRR), Rectangular Patch Antenna, Microstrip, Metamaterial, Split Ring Resonator (SRR).

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Shobhit K. Patel ¹, Y. P. Kosta ²

Affiliations
1 Charotar University of Science and Technology, Changa-388221, Gujarat, IN
2 Marwadi Education Foundation’s Group of Institutions, Rajkot, Gujarat, IN

Abstract

The area of micro strip antennas has seen some inventive work in recent years and is currently one of the most dynamic fields of antenna theory. Mobile personal communication systems and wireless computer networks are commonly used nowadays and they need antennas in different frequency bands. The design adopts patch structure and introducing the novel truncated patch offering multiband applications. The proposed patch has a compact dimension. The antenna works on four bands having center frequencies, 5.6, 7.1, 8,1, and 9.5 GHz. The design is suitable for applications in C-band and X-band Communications. Design results are obtained by a HFSS (High Frequency Structure Simulator) which is used for simulating microwave passive components.

Keywords

Microstrip Patch Antenna, Multiband, C-Band, X-Band.

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Jaymin Bhalani ¹, Dharmendra Chauhan ¹, Y. P. Kosta ², A. I. Trivedi ³

Affiliations
1 Electronics and Communication Engineering Department, Charotar University of Science and Technology, Changa, IN
2 Marvadi Institute of Technology, Rajkot, IN
3 Electrical Engineering Department, M.S. University, Baroda, IN

Abstract

In this paper, we propose two novel semi-blind channel estimation techniques based on QR decomposition for Rayleigh flat fading Multiple Input Multiple output (MIMO) channel using different receiver antenna combinations and various pilot symbols. In the first technique, the flat-fading MIMO channel matrix H can be decomposed as a upper triangular matrix R and a unitary rotation matrix Q as H=RQ. The matrix R is estimated blindly from only received data by using orthogonal matrix triangularization based house holder QR decomposition, while the optimum rotation matrix Q is estimated exclusively from pilot based Orthogonal Pilot Maximum Likelihood Estimator (OPML) algorithm. In the second technique, joint semi-blind channel and data estimation is performed using QR decomposition based Least Square (LS) algorithm. Simulations have taken under 4-PSK data modulation scheme for two transmitters and different combinations of receiver antennas as well as various training symbols. Finally, these two new techniques compare with Whitening Rotation (WR) based semi-blind channel estimation technique and results shows that those new techniques achieve very nearby performance with low complexity compare to Whitening rotation based technique. Also first technique with perfect R outperforms Whitening Rotation based technique.

Keywords

Multiple Input Multiple Output, Orthogonal Pilot ML Estimator, QR Decomposition, Semi Blind Channel Estimation.

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