Soumyasree Bera

Capacity Analysis of ZF Receiver in Correlated MIMO Nakagami-m Channel

We investigate the ergodic capacity of multiple-input multiple-output (MIMO) system in Nakagami-m fading channels with linear receivers. Particularly in this paper, zero-forcing (ZF) receiver is considered. In this paper, we were able to demonstrate the impact of the channel impairment on the channel eigenvalues of the MIMO system and also represent the useful insights into the impact of the correlated Nakagami-m channel parameters (e.g., correlation coefficient and Nakagami fading parameter m).

Embedded Digital MIMO Radar Using SDR for Target Detection and RCS Measurement

ABSTRACT Multiple input multiple output (MIMO) radar has superior performance to conventional one. It has been introduced in almost every field of conventional radar now days. The MIMO techniques have been well studied where they offer benefits in multipath fading environments. Inspired by these, MIMO are applied to radar and offer advantages such as improved resolution and sensitivity. But these systems consist of large antenna, a lot of electronic equipment and powerful computational unit. In these applications, small size embedded software define radio (SDR) can be used. Then real time processing of a radar signal can also be much simpler. For above-mentioned applications, it is possible and reasonable to have small devices with low power consumption that perform real time correlation-based processing. Moreover, dimensions of the processor boards are very compact and they can be easily integrated into small cases. That is why it is good to transfer radar signal processing algorithms to the embedded system. The recent development of digital MIMO radar is now module in these SDR systems. Our motivation is to design a spread spectrum-based digital MIMO SDR radar which is small in size and may be a low-cost solution where we can bypass all the huge instrumentation complexity.

Design and Analysis of Optimum APSK Modulation Technique

This paper investigates the design of power and spectrally efficient coded modulations based on amplitude phase shift keying (APSK) modulation with application to satellite broadband communications. This paper presents the error rate analysis of circular APSK modulation with additive white Gaussian noise (AWGN) channel, and an approach to design optimum APSK configuration is being discussed. A circular APSK constellation can have a large number of configurations based on the number of points present in each ring and a total number of rings, which have variable bit error rate based on the configuration. The approach tries to find the optimum APSK configuration and analyzes their performance in Rician and AWGN channels.

Review on Vehicular Radar for Road Safety

The paper is a survey of vehicular radar for road safety. Vehicular radar is also called automotive radar. It is introduced for avoiding collision and for reducing human and economic losses in road accidents. Automotive radar functions to detect objects and obstacles in its surrounding area and to prevent collision. Its other applications include speed sensing, predictive crash sensing, collision mitigation, and automatic braking which are addressed in this survey. This paper presents recent approaches done in automotive radar and trend and requirements of autonomous driving.

A Review on Spread Spectrum Radar

Radar is used for diverse applications, and there is an enormous progression in the development of different new technologies based on its uses. It is ever growing and evolving. An overview of some of the technologies used in Radar such as spread spectrum, digital beamforming and phased array technology, and also Pulse Doppler Radar and Single Channel Spread Spectrum Digital Beamforming Radar are discussed in this paper.

5G Technology Enabling the Wireless Internet of Things

New technology trend has been initiated worldwide for the exploration of IoT using 4G and 5G mobile communications, cloud RAN, and extended coverage beyond the coverage area of mobile network. Motivated by the above trends, ECE Department, SMIT has started to build one test bed for IoT using 5G. At first, some recent papers are reviewed toward practical perspective on IoT in 5G network issues related to (i) latency critical IoT applications in 5G, (ii) efficient IoT gateway over 5G wireless, and (iii) efficient 5G small cell planning with eMBMS for optimal demand response in smart grids. This paper will discuss the detailed development efforts to achieve the IoT test bed. Efforts are rendered to make the test bed as a high-end research facility, industrial consultancy, and support toward 5G-enabled wireless IoT.

Assessment of Pulse-Doppler Radar and Digital Beamforming Radar

In radar domain, digital beamforming radar is evolving as a promising radar technology as compared to conventional pulse-Doppler radar. The design of PD radar and DBF radar is done by keeping all the design parameters same, and its performance is compared in this work. Needless to say that PD radar uses only analog systems but DBF radar uses digital systems. DBF radar’s performance is high, as compared to PD radar because of the use of digital techniques and MIMO antennas. The difference in signal to clutter ratio is 5.23 dB, i.e., SNR of DBF radar is three times greater than PD radar. The only limitation of DBF radar is being the hardware complexity, due to the use of multiple transceivers at each element of an antenna array, resulting in increased cost, size, weight, and power of the overall system.

Implementation of Doppler Radar at 24 GHz

Doppler radar has applications in many fields. It can be used in weather forecasting. It can also be used to check speeding violations of vehicles and in air traffic control radar to detect incoming and outcoming aircrafts. Astronomers use it to discover new planets and stars. This effect is analyzed using transforms like Fast Fourier Transform (FFT), Short-Time Fourier Transform (STFT), and Wigner–Ville Distribution (WVD). WVD has been preferred more for its high resolution. In software, low Doppler will be detected while in hardware due to limitations, low Doppler will not be detected. In this report, the methods of extraction and mitigation of Doppler are explained with viable algorithms and results.

Design of Spectrum Sensing System

Current spectrum management is licensed in a definite frequency band, and since a large part of radio spectrum allocation is already done, vacant bands are not available to either effectively use new services or develop existing ones. As a solution to this, it is required to find means for improved spectrum utilization creating situations for access of dynamic spectrum. In these days, spectrum scarcity is a prime hurdle faced by all users. This problem gives rise to the idea of cognitive radio, where available channels for communication are detected and instantly moved into vacant channels. In this paper, matched filtering and energy detection methods are covered, where our motive is the all-time presence of spectrum to all users.

DVBS2 System Using SDR in Hardware-in-Loop Mode

Digital Video BroadcastingSatellite 2 nd generation (DVBS2) is one of the popular source of entertainment in today’s world. It has made TV viewing superb experience due to its ability of sharing high quality picture (i.e. High Definition). But the satellite channel basically follows AWGN type of response as there is lesser chances of multipath generation. The following paper deals with the implementation of the DVBS2 system in Software Defined Radio (SDR) platform and further analysis of its performance both in terms of bit error rate (BER) and actual multimedia transfer capability over different channel conditions like AWGN, and also under multipath condition i.e. Rician channel. All the analysis in the paper is done in hardware-in-loop mode.