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Your search keyword '"Awadhesh Gupta"' showing total 7 results
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7 results on '"Awadhesh Gupta"'

1. An Affine Precoded Superimposed Pilot-Based mmWave MIMO-OFDM ISAC System

Author

Awadhesh Gupta, Meesam Jafri, Suraj Srivastava, Aditya K. Jagannatham, and Lajos Hanzo

Subjects
sensing and communication (ISAC), dual-function radar-communication (DFRC), millimeter wave (mmWave), affine-precoded superimposed-pilot (AP-SIP), Bayesian Learning (BL), Telecommunication, TK5101-6720, Transportation and communications, HE1-9990
Abstract

A new affine-precoded superimposed pilot (AP-SIP) scheme is conceived for both wireless channel and radar target parameter estimation in a millimeter wave (mmWave) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM)-based integrated sensing and communication (ISAC) systems. The AP-SIP scheme leads to enhanced estimation accuracy and improved utilization of spectral resources. Initially, the pilot-assisted radar (PAR) and data-assisted radar (DAR) parameter estimation models are separately developed for the estimation of the radar target parameters. Subsequently, these are combined into a joint pilot-data radar (JPDR) model for simultaneously harnessing both the signals to further boost the estimation accuracy. The sparse Bayesian learning (BL)-based joint-BL (J-BL) technique is developed for this system that efficiently exploits the sparsity of the radar scattering environment. Next, a group sparse BL (G-BL) technique is also derived that exploits the group sparsity across subcarriers for the estimation of the wireless beamspace channel vector, which outperforms the competing techniques, including conventional sparse BL. The optimal pilot, transmit precoder (TPC) and receive combiner (RC) are determined at the dual-function radar-communication (DFRC) base station (BS) and also at the user equipment (UE) for maximizing the performance attained. The Bayesian Cramer-Rao bounds (BCRB) are explicitly derived to benchmark the performance of the wireless channel and radar target parameter estimation. Simulation results are provided to demonstrate the improved performance of the proposed schemes considering multiple metrics, such as the normalized mean squared error (NMSE), bit error rate (BER) and achievable spectral efficiency (ASE).

Published
2024
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6. Role of E-cadherin in Progression of Oral Squamous Cell Carcinoma: A Retrospective Immunohistochemical Study

Author

Mohammed Abidullah, Swathi Bhuvinder, Monisha Batra, Awadhesh Gupta, Seema Sharma, and Padmavathi Katragadda

Subjects
0301 basic medicine, Pathology, medicine.medical_specialty, Epithelial dysplasia, Tumor suppressor gene, Carcinogenesis, Gene Expression, medicine.disease_cause, 03 medical and health sciences, 0302 clinical medicine, Carcinoma, medicine, Biomarkers, Tumor, Humans, General Dentistry, Retrospective Studies, business.industry, Mouth Mucosa, Cancer, medicine.disease, Cadherins, Prognosis, Immunohistochemistry, stomatognathic diseases, 030104 developmental biology, Dysplasia, 030220 oncology & carcinogenesis, Carcinoma, Squamous Cell, Disease Progression, Biomarker (medicine), Mouth Neoplasms, business
Abstract

Aim The aim of present study was to assess the role of E-cadherin in oral carcinogenesis by comparing their expressions in normal oral mucosa, oral epithelial dysplasia (OED), and oral squamous cell carcinoma (OSCC). Materials and methods To elucidate the pattern of E-cadherin expression in oral carcinogenesis, 21 archival cases of formalin-fixed paraffin-embedded sections of OSCC, 21 OED, and 7 normal oral mucosa samples as control were used for the study. Results We observed reduction/loss of E-cadherin in membranous expression pattern and staining intensity with progression from dysplasia to oral cancer. Conclusion A decrease in staining intensity and loss of E-cadherin membranous expression were noted from dysplasia to carcinoma, suggesting its role as a tumor suppressor gene. Clinical significance E-cadherin can be used as a biomarker to assess and evaluate the progression and prognosis of oral dysplastic lesions and OSCC.

Published
2018

7. A closed-form outage probability of opportunistic AF OFDMA relaying over Rician fading channel

Author

Sudhan Majhi, Awadhesh Gupta, Piyush Kumar, and Youssef Nasser

Subjects
Independent and identically distributed random variables, Computer science, Orthogonal frequency-division multiplexing, Orthogonal frequency-division multiple access, 050801 communication & media studies, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, Subcarrier, law.invention, 0508 media and communications, Signal-to-noise ratio, Relay, law, Rician fading, Computer Science::Networking and Internet Architecture, 0202 electrical engineering, electronic engineering, information engineering, Fading, Computer Science::Operating Systems, Computer Science::Information Theory, business.industry, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 05 social sciences, 020206 networking & telecommunications, Computer Science::Performance, ComputingMethodologies_GENERAL, business, Computer network
Abstract

This paper analyzes a closed-form outage probability of opportunistic amplify-and-forward (AF) orthogonal frequency division multiple access (OFDMA) relaying in the presence of independent and identically distributed (i.i.d) and independent but non-identically distributed (i.n.d) fading environments. In practice, opportunistic relaying often experiences Rician fading channel, however, there is a very limited contribution on opportunistic AF OFDMA system over this fading channel. In this paper, we adopt Rician fading environment for closed-form outage probability analysis of opportunistic AF OFDMA relaying. The opportunistic AF OFDMA relaying is a relay selection process where the best relay nodes are selected based on maximum SNR per subcarrier per relay node. The opportunistic AF OFDMA relaying obtains diversity over both subcarriers and relay nodes where opportunistic AF over orthogonal frequency division multiplexing (OFDM) relaying gets diversity only over relay nodes. Thus opportunistic AF OFDMA provides better outage performance over opportunistic AF OFDM and opportunistic AF single carrier relaying. The analytical outage probability is validated through Monte-Carlo simulations at high SNR regime and compared with existing relaying techniques.

Published
2016
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