In this communication, necessary and sufficient conditions are presented for the unique blind identification of possibly nonminimum phase channels driven by cyclostationary processes. Using a frequencydomain formulation, it is first shown that a channel can be identified by the second-order statistics of the observation if and only if the channel transfer function does not have special uniformly spaced zeros. This condition leads to several necessary and sufficient conditions on the observation spectra and the channel impulse response. Based on the frequency-domain formulation, a new identification algorithm is proposed

Blind channel identification based on second-order statistics: a frequency-domain approach

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Conformal Array Antenna Theory And Design

This paper presents a dual band circular microstrip patch antenna with an elliptical slot for future 5G mobile communication networks. The antenna has resonating frequencies of 28 GHz and 45 GHz, with bandwidths of 1.3 GHz and 1 GHz, respectively. Efficiency of the antenna is 85.6% at 28 GHz and 95.3% at 45 GHz. The return loss at 28 GHz is −40 dB, with maximum gain of 7.6 dB while at 45 GHz return loss is −14 dB with maximum gain of 7.21 dB. The antenna is designed on a Rogers RT5880 (lossy) substrate with dielectric constant of 2.2 and loss tangent (tan δ) of 0.0013. The antenna has a compact size of 6× 6× 0.578 mm3. Array configuration is used to achieve 12 dB gain, required for mobile communication. The proposed array has resonance frequencies of 28 GHz, 34 GHz and 45 GHz with maximum gain of 13.5 dB and radiation efficiency of 98.75%. Centre series fed technique is used for the excitation of array. SAR value of array antenna obtained at 28 GHz is 1.19 W/kg, at 34 GHz is 1.16 W/kg, and at 45 GHz is 1.2 W/kg. CST Microwave Studio, a 3D simulating tool, is used for the antenna design and calculation of the antenna parameters along with the SAR analysis.

https://www.jpier.org/download/18101401.pdf

Elliptical slot circular patch antenna array with dual band behaviour for future 5G mobile communication networks

https://cyberleninka.org/article/n/192835.pdf

Symmetric encryption algorithms using chaotic and non-chaotic generators: A review.

A depth camera-based novel method is proposed here for efficient facial expression recognition. For each pixel in a depth image, eight local directional strengths are obtained and ranked. Once the rank of all pixels is obtained, eight histograms are developed for the eight surrounding directions. The histograms are then concatenated to represent features for a depth image of a face. This approach is named local directional rank histogram pattern (LDRHP). To combine with LDRHP features, one more robust feature extraction technique named local directional strength pattern (LDSP) is proposed. Typical local directional pattern (LDP) considers only absolute values of edge strengths for a pixel. This generalization in LDP may generate the same patterns for two different kinds of edge pixels. LDSP can overcome this problem. It considers the binary values of the position with the directions representing the highest and lowest original strengths. The highest strength indicates the strongest direction on the bright side of a pixel and the lowest one indicates the strongest direction in the dark side of that pixel. Hence, combining binary positions of these two directions can generate more robust patterns than LDP. Besides, LDSP pattern of a pixel is of six bits, whereas traditional LDP-based patterns are of eight bits (e.g., local directional deviation-based pattern and local directional position pattern). Thus, LDSP reduces the dimension of features with the same time adding robustness. For a depth image in a depth video, LDSP features are augmented with LDRHP features followed by Kernel principal component analysis and generalized discriminant analysis to generate more robust features. At last, the features are trained with a deep learning approach and convolutional neural network for successful facial expression recognition. The proposed approach is compared and shown to outperform the traditional expression recognition methods.

Facial Expression Recognition Using Salient Features and Convolutional Neural Network

Wireless AdHoc and sensor networks are very broadly used in many remote applications. AdHoc networks still have problems in conveying data from one node to other node. This problem further increases with the mobile nodes. Now a days different routing algorithms are being developed for mobile wireless AdHoc networks. In this paper, some of them are discussed. Mobile Ad hoc networks and Mobile Wireless Sensor Networks are similar to each other as both depend on hop-to-hop routing. So, protocols developed for Mobile ad-hoc networks are also used in many Mobile sensor applications. In this paper Angle based DSR is discussed, which is developed for Mobile AdHoc networks or mobile Wireless Sensor Networks and derived from changes done in DSR, which was developed for MANETs. Moto of this paper is to give an idea that other protocols which were developed for MANETs can be completely used in Mobile WSNs, by having angle-based mechanism, as described in ADSR.

Concept of ADSR for Mobile AdHoc Networks/Wireless Sensor Networks

The paper presents the design of a microstrip patch antenna having π and T-shaped slot connected to each other. The proposed antenna is printed on FR4 substrate having dielectric constant of 4.3 and thickness of 1.6 mm that can operate on band 8.357 GHz, 10.97 GHz and 13.154 GHz. The structure was simulated through CST microwave studio. All the simulated parameters like return loss, directivity, gain and radiation pattern in 2D/3D for port one and port two are presented.

A Microstrip Patch Antenna [Pi] and T-Shaped Slot for X-Band Application

In this paper we have presented an overview of Massive MIMO systems in wireless communication which are the breakthrough in wireless communication technology nowadays. MIMO systems are used to improve the noise and interference performances of a channel. In the paper, MIMO systems are used to expand channel capacity and BER are also highlighted. The discussion then proceeds further towards the limitations and advancements in this technology. In modern scenario massive MIMO includes merger of OFDM with MIMO. By the use of MIMO-OFDM, very high data rates are achieved.

Massive MIMO Systems In Wireless Communication

This chapter reviews the secure characteristics of mobile devices that can use wireless networks (adhoc) almost any where and any time, by using one or more wireless network technologies. Currently, most computers communicate with each other by using wired networks. This approach is well suited for stationary computers, but it is not appropriate for mobile devices. These technologies enable the use of infrastructured networks (3GPP) and ad-hoc networks. Furthermore, the authors describe the gateway specification, requirement for implementation for ad-hoc networks. The minimum, essential, and additional functional requirements for effective functionality of gateway are presented in tabular form. At the end, the future functional requirement and the features of multiple ad-hoc networks are also described.

A Secure Characteristics of Wireless Ad-Hoc Networks

I t is a challenge area in the field of ad hoc networks to support prioritized routing for time sensitive applications, such as multimedia communications, IP telephony and interactive games. However the existing protocols did not consider the special battery discharging behavior of wireless devices. The limited power supply on wireless devices becomes the bottleneck for prioritized routing in ad hoc networks. Wireless devices powered by battery generally waste a huge amount of energy if we do not carefully schedule and budget their discharging. In this paper we compare DYMO and Bellman protocols for battery models DURACELL AA (MX 1500), PANASONIC AA, PANASONIC AAA, duracell MN 2400, DURACELL MX2400 standard using Qualnet as a Simulation tool. Hence performance of the protocols with various battery models counts and helps to make a right selection.

Sandip Vijay

Papers

Concept of ADSR for Mobile AdHoc Networks/Wireless Sensor Networks

A Microstrip Patch Antenna [Pi] and T-Shaped Slot for X-Band Application

Massive MIMO Systems In Wireless Communication

A Secure Characteristics of Wireless Ad-Hoc Networks

Comparative Study of DYMO and Bellman Ad hoc Routing Protocol for various Battery models in MANET using Qualnet