A rectangular dielectric resonator based connected ground quad-elements MIMO antenna fed using substrate integrated waveguide (SIW) is proposed for millimeter-wave 5G application. SIW in TM10 mode was used to excite multiple modes in the dielectric resonator to achieve multiple resonance. An individual element of the proposed MIMO antenna is arranged in a cross shaped structure to achieve polarization and spatial diversity. The proposed MIMO system operates at dual operating frequency bands having impedance bandwidth of 24% (24.50–27.50 GHz) and 12% (33–37 GHz). The isolation better than 22 dB and 17 dB is achieved throughout the proposed bands without using any additional isolation techniques. The proposed MIMO antenna has a peak gain of 9.9 dB and minimum radiation efficiency of 96%. It radiates in a broadside direction with acceptable MIMO diversity results where envelope correlation coefficient is below 0.15, channel capacity loss is below 0.6 bits/sec/Hz, diversity gain of 9.98 dB, and total active reflection coefficient below −10 dB over the desired band of operation. The prototype of the quad-elements SIW fed DRA MIMO was manufactured after which the antenna and diversity performance parameters were measured and satisfactory correlation is observed.

Substrate integrated waveguide fed dual band quad-elements rectangular dielectric resonator MIMO antenna for millimeter wave 5G wireless communication systems

two listed  are 1) the reference  model is a  nonlinear, time-varying system, and 2) the adjustable  system also contains  nonlinearities. These situations may lead to violations of the basic hypothesis in the parameter identification and adaptive observer problems, but not in the adaptive control problem.  Another  consequence is that here seems to be a serious omission of one assumption required in the control problem but not in the other two. That is that Ahe sign of the leading coefficient in the plant’s numerator polynomial b , in equation (6.4-35), must be known. Solutions which do not require this assumption have been discussed by various people, but are not very satisfactory because the algorithms invariably involve pogntial division by zero. The requirement for knowledge of the sign of bm in the control case. is obscured in the general discussion of Section 4.2 of Chapter Iv. Chapters 7 and 8 give a good development of the model reference adaptive  approach to the parameter  identification  problem and the simultaneous adaptive state observation and parameter identification problem, respectively. Chapter 7 contains the development for both continuous time and discrete time identification algorithms, and considers the importance of variable (time decreasing) adaption g a i n s in the presence of measurement noise. The advantages and disadvantages of parallel identifiers (output error method) and series-parallel identifiers (equation error method) are discussed. Two case studies are included, one using the continuous time algorithm and one the discrete time algorithm. Chapter 8 deals only with discrete time algorithms in a deterministic context. The last statement in Chapter 7 is, “ M U S identifiers can be used for implementing adaptive control schemes.” Some discussion concerning the potential  stability  problems associated with this approach would have been helpful. The author should be commended for even attempting a book in this extremely active area of research where many concepts have not yet completely solidified. He has achieved to a considerable degree his stated goals of making the book interesting to practicing engineers, useful as a textbook for graduate students, and a starting point for further investigation by researchers.

Principles of digital communication and coding

Dataset for the Paper titled "Flexible 2.4 GHz Node for Body Area Networks with a Compact High-Gain Planar Antenna", in the IEEE Antennas and Wireless Propagation Letters.
Also related to: Wagih, M., Wei, Y., Yong, S., & Beeby, S. (2018). Connecting and powering flexible IoT, an insole case study. Poster session presented at Arm Research Summit 2018, Cambridge, United Kingdom.

Dataset for Flexible 2.4 GHz Node for Body Area Networks with a Compact High-Gain Planar Antenna

This paper presents a secrecy performance analysis of a parallel free-space optical/millimeter-wave (mm-wave) communication system with a selection-combining receiver over a unified Fisher-Snedecor $\mathcal{F}$-distribution channel. The $\mathcal{F}$-distribution model, with the proper parameters, may be used to describe both the mm-wave and optical channels. The security performance is specifically evaluated by deriving closed-form expressions for the average secrecy capacity, secrecy outage probability, and strictly positive secrecy capacity. We examine the three following distinct security scenarios: 1) An FSO-link eavesdropping attack, 2) mm-wave-link eavesdropping attacks, and 3) eavesdropping attacks on FSO and mm-wave links at the same time. Furthermore, to better understand the influence of various system and channel parameters, asymptotic analysis is performed at high signal-to-noise ratio values. Our developed analytical expressions provide an efficient tool for examining the influence of various system and channel parameters on the secrecy performance, including the atmospheric turbulence severity, pointing errors of the FSO link, fading severity, the shadowing parameters, as well as the number of diversity branches of the mm-wave links. Monte-Carlo simulations are used to verify the correctness of the numerical findings.

/pdf/secrecy-performance-analysis-of-parallel-fso-mm-wave-system-2mkrlifx.pdf

Secrecy Performance Analysis of Parallel FSO/mm-wave System Over Unified Fisher-Snedecor Channels

A planar CPW fed UWB antenna with dual rectangular notch band characteristics incorporating U-slot, SRRs, and EBGs

A compact multiple input multiple output (MIMO) antenna operating at 2.45 GHz industrial scientific and medical band is presented for wearable devices. Open-end slotting is used to miniaturize the antenna dimensions. Inverted U-shaped ground stub is incorporated to reduce mutual coupling. On-body performance is analyzed on a three-layered equivalent tissue phantom model. The wide bandwidth of 300 MHz and port isolation of 30 dB are obtained from measured results. The antenna shows the efficiency of 40% and directivity of 4.56 dBi when placed at a gap of “s” = 4 mm from the body. Broadside radiation pattern and low specific absorption rate make the antenna suitable for on-body communication. Further, diversity performance is measured in terms of envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss (CCL). The value of ECC is 0.025, DG is 9.98 dB, and CCL is 0.12 bits/s/Hz at 2.45 GHz. Antenna robustness is examined by bending the structure at different radii along the x-axis and y-axis. Performance of the proposed structure is reliable with structural deformation.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/B970B6DD288EB9A9E5D2BF7DAB4AB4A6/S1759078720000471a.pdf/div-class-title-design-of-a-wearable-mimo-antenna-deployed-with-an-inverted-u-shaped-ground-stub-for-diversity-performance-enhancement-div.pdf

Design of a wearable MIMO antenna deployed with an inverted U-shaped ground stub for diversity performance enhancement

Bio-telemetry is an advanced area of research that enables the transmission of biomedical parameters from human body to external monitoring device. Wearable antennas showing robust performa...

Design of a patch antenna with square ring-shaped-coupled ground for on-/off body communication

Median filtering has received considerable attention and popularity for image enhancement and anti-forensics. It can be utilized as an image denoising and smoothing tool to disguise the footprints of image processing operations such as image resampling and JPEG compression. A two-step median filtering anti-forensic framework is proposed in this paper to fool the existing median filtering forensic detectors by hiding the median filtering artifacts. In the proposed framework, a variational deconvolution approach is initially employed to generate a median filtered forgery. Now, this forgery is further processed in the second step by considering Total Variation (TV) based minimization optimization problem to eradicate the median filtering artifacts left during deconvolution operation. Moreover, the proposed TV-based minimization algorithms significantly reduce the unnatural (grainy) noise left during the variational deconvolution. Two types of TV-based minimization problems are suggested, first relies on the TV of energy by considering the image gradient and second on the structure of a given image. The performance of the proposed scheme is evaluated by considering the worst-case and optimal scenarios. The experimental results based on UCID and BOSSBase dataset images demonstrate that the proposed anti-forensic methods provide superior results in terms of image visual quality and forensic undetectability as compared to the existing approaches, with slight increase in computational time.

An improved median filtering anti-forensics with better image quality and forensic undetectability

In present era antenna is playing a prominent role in biomedical engineering for improving health and quality of life. Pacemakers, deep neural implants, endoscopy, magnetic resonance imaging, microwave imaging and clinical instruments for thermal ablation are some examples of health care instruments which are taking the benefits of antenna and wireless body area network. Antennas can be implanted, placed on body and swallowed to transfer diagnosis information from the human body to the external monitor and further to the doctor or concern person through internet. In addition, variation in the electrical parameter of antenna like near field electromagnetic radiations, impedance, reflection coefficient can be analyzed to detect diseases non-invasively. Breast and brain tumour detection, cancer detection and motion detection are some of the important applications of antennas. Moreover, heating effect of electromagnetic field is also valuable to treat the malignant cell tissues. In this survey paper, authors have covered all the possible application of antenna and the challenges faced by antenna designers to make them suitable for specific application.

A survey and classification on applications of antenna in health care domain: data transmission, diagnosis and treatment

cognitive radio is the solution for effectively utilizing the underutilized radio spectrum. There are many techniques to sense spectrum using cognitive radios like matched filter detection, energy detection, waveform based detection, cyclostationary feature detection and so on. In this paper comparative analysis of two popular techniques i.e. energy detection (ED) and cyclostationary feature detection (CFD) is discussed. Analysis is carried out by discussing the theoretical aspect of both the techniques supported by simulation graphs and plots. This analysis shows that among the two techniques discussed CFD shows better results.

/pdf/comparative-analysis-of-the-spectrum-sensing-techniques-1heg2thgt5.pdf

Ankush Kansal

Papers

Design of a wearable MIMO antenna deployed with an inverted U-shaped ground stub for diversity performance enhancement

Design of a patch antenna with square ring-shaped-coupled ground for on-/off body communication

An improved median filtering anti-forensics with better image quality and forensic undetectability

A survey and classification on applications of antenna in health care domain: data transmission, diagnosis and treatment

Comparative Analysis of the Spectrum Sensing Techniques Energy Detection and Cyclostationary Feature Detection