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Channel estimation and channel tracking for correlated block-fading channels in massive MIMO systems

Digital Communications and Networks 2018年第2期4卷 138-147页

作者： suresh dahiya Arun Kumar Singh Department of Electrical Engineering Indian Institute of Technology Jodhpur Rajasthan 342011 India

This paper presents a channel estimation and tracking method for correlated block-fading channels in massive MIMO wireless cellular systems. In order to conserve resources, the proposed algorithm requires the uplink pilot signal only once, at the start of communication. By utilizing the temporal correlation between consecutive Resource Blocks （RBs） and the error correction capability of turbo codes, the channel matrix in subsequent RBs is estimated at the Base Station （BS） itself using the uplink data of current the RB and the estimated channel matrix of previous the RB. Compared to existing blind estimation methods, the proposed method places fewer limitations on the system settings such as the number of BS antennas, the number of users, and the number of coherent channel usage compared to existing blind estimation methods. Simulation results show that the proposed algorithm provides better performance for a moderate RB size, a high-order of QAM scheme, and a smaller ratio of the number of BS antennas and mobile terminals （N/K）. For a reasonably small N/K （order of 10）, the proposed scheme achieves a lower symbol error probability than the conventional pilot-based estimation approach.

关键词： Massive MIMO Channel estimation Resource block Turbo coding Mobile terminal

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Medication adherence and quality of life among type-2 diabetes mellitus patients in India

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World Journal of Diabetes 2021年第10期12卷 1740-1749页

作者： Rakhi Mishra suresh K Sharma Rajni Verma Priyanka Kangra Preeti dahiya Preeti Kumari Priya Sahu Priyanka Bhakar Reena Kumawat Ravinder Kaur Ravinder Kaur Ravi Kant College of Nursing All India Institute of Medical SciencesUttarakhand 249203RishikeshIndia Department of Medicine All India Institute of Medical SciencesUttarakhand 249203RishikeshIndia

BACKGROUND Diabetes mellitus(DM)is a progressively increasing metabolic disorder and a significant public health burden that demands immediate global ***,there is a paucity of data about adherence to antidiabetic drugs among patients with type-2(T2)DM in Uttarakhand,*** research reported that more than 50%of patients do not adhere to the correct administration and appropriate medicine *** has been reported that patients with chronic diseases who adhere to treatment may experience improvement in quality of life(QoL)and vice *** To assess the adherence to antidiabetic medication and QoL among patients with *** This cross-sectional descriptive study was conducted at a tertiary care hospital in Uttarakhand,*** Medication Adherence Rating Scale and World Health Organization QoL-BREF scale were used to assess medication adherence and *** Two hundred seventy-seven patients suffering from T2DM participated in the *** mean age was 50.80(±10.6)years,155(56%)had a poor adherence level and 122(44%)had a good adherence level to antidiabetic *** adjusting for sociodemographic factors,multiple linear regression analysis found patients who were adherent to antidiabetic medications had significantly higher mean overall perception of QoL and overall perception of health,with beta scores of 0.36 and 0.34,respectively(both P=0.000)points compared with nonadherent *** There was an association between medication adherence and QoL in patients with ***,there is a need to plan awareness and counseling programs followed by regular follow-up to motivate patient adherence to recommended treatment and lifestyle regimens.

关键词： Medication adherence Quality of life Diabetes mellitus Tertiary care hospital India

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