Journal Publications

1. Mukherjee, S.*, and Chopra, R., "Performance Analysis of Cell-free massive MIMO Systems in LoS/ NLoS Channels", IEEE Transactions on Vehicular Technology , vol.71, issue 6 , (DOI - 10.1109/TVT.2022.3161702) ,pp.6410-6423, [2022].

2. Van Chien T., Papazafeiropoulos A.K., Tu L.T., Chopra R., Chatzinotas S., Ottersten B., "Outage probability analysis of IRS-assisted systems under spatially correlated channels", IEEE Wireless Communications Letters , vol.10, issue 8 , (DOI - 10.1109/LWC.2021.3082409) ,pp.1815-1819, [2021].

3. Dave A., Kuhar S., Chopra R., "Deep Learning Based Semi-Blind Tracking for Aging Wireless Communication Channels", Wireless Personal Communications , vol.119, issue 3 , (DOI - 10.1007/s11277-021-08354-x) ,pp.2695-2706, [2021].

4. Chopra R., Murthy C.R., Papazafeiropoulos A.K., "Uplink Performance Analysis of Cell-Free mMIMO Systems under Channel Aging", IEEE Communications Letters , vol.25, issue 7 , (DOI - 10.1109/LCOMM.2021.3073778) ,pp.2206-2210, [2021].

5. Baby I.M., Appaiah K., Chopra R., "Optimal Channel Tracking and Power Allocation for Time Varying FDD Massive MIMO Systems", IEEE Transactions on Communications , (DOI - 10.1109/TCOMM.2021.3127281) [2021].

6. Chopra R., Murthy C.R., "Data aided MSE-optimal time varying channel tracking in massive MIMO systems", IEEE Transactions on Signal Processing , vol.69 , (DOI - 10.1109/TSP.2021.3093762) ,pp.4219-4233, [2021].

7. Vishwamittar Batra P., Chopra R., "Stochastic resonance in two coupled fractional oscillators with potential and coupling parameters subjected to quadratic asymmetric dichotomous noise", Physica A: Statistical Mechanics and its Applications , vol.561 , (DOI - 10.1016/j.physa.2020.125148) [2021].

8. Ghosh S., Chopra R., "Downlink Pilots for Hybrid Massive MIMO under Reciprocity Imperfections", IEEE Communications Letters , vol.24, issue 10 , (DOI - 10.1109/LCOMM.2020.3004001) ,pp.2334-2338, [2020].

9. Chowdhury A., Chopra R., "Frame Structures for Massive MIMO Communications Under Channel Aging", Wireless Personal Communications , vol.111, issue 4 , (DOI - 10.1007/s11277-019-07008-3) ,pp.2659-2669, [2020].

10. Chopra R., Murthy C.R., Suraweera H.A., Larsson E.G., "Blind Channel Estimation for Downlink Massive MIMO Systems with Imperfect Channel Reciprocity", IEEE Transactions on Signal Processing , vol.68 , (DOI - 10.1109/TSP.2020.2988570) ,pp.3132-3145, [2020].

11. Chopra R., Murthy C.R., Annavajjala R., "Physical Layer Security in Wireless Sensor Networks Using Distributed Co-Phasing", IEEE Transactions on Information Forensics and Security , vol.14, issue 10 , (DOI - 10.1109/TIFS.2019.2905759) ,pp.2662-2675, [2019].

12. Ghosh S., Chopra R., "Training for massive MIMO systems with non-identically aging user channels", Physical Communication , vol.35 , (DOI - 10.1016/j.phycom.2019.100710) [2019].

13. Chopra R., Murthy C.R., Suraweera H.A., Larsson E.G., "Analysis of Nonorthogonal Training in Massive MIMO under Channel Aging with SIC Receivers", IEEE Signal Processing Letters , vol.26, issue 2 , (DOI - 10.1109/LSP.2018.2889955) ,pp.282-286, [2019].

14. Chopra R., Murthy C.R., Rangarajan G., "Statistical Tests for Detecting Granger Causality", IEEE Transactions on Signal Processing , vol.66, issue 22 , (DOI - 10.1109/TSP.2018.2872004) ,pp.5803-5816, [2018].

15. Chopra R., Murthy C.R., Suraweera H.A., Larsson E.G., "Performance Analysis of FDD Massive MIMO Systems under Channel Aging", IEEE Transactions on Wireless Communications , vol.17, issue 2 , (DOI - 10.1109/TWC.2017.2775629) ,pp.1094-1108, [2018].

16. Chopra R., Annavajjala R., Murthy C.R., "Distributed Cophasing with Autonomous Constellation Selection", IEEE Transactions on Signal Processing , vol.65, issue 21 , (DOI - 10.1109/TSP.2017.2739106) ,pp.5798-5811, [2017].

17. Chopra R., Ghosh D., Mehra D.K., "Spectrum sensing for OFDM signals using pilot??induced??cyclostationarity in the presence of cyclic??frequency??offset", Physical Communication , vol.24 , (DOI - 10.1016/j.phycom.2017.07.008) ,pp.182-194, [2017].

18. Chopra R., Murthy C.R., Suraweera H.A., "On the Throughput of Large MIMO Beamforming Systems with Channel Aging", IEEE Signal Processing Letters , vol.23, issue 11 , (DOI - 10.1109/LSP.2016.2604347) ,pp.1523-1527, [2016].

19. Chopra R., Ghosh D., Mehra D.K., "Performance evaluation of FRESH filter based spectrum sensing for cyclostationary signals", Physical Communication , vol.20 , (DOI - 10.1016/j.phycom.2016.04.004) ,pp.17-32, [2016].

20. Chopra R., Ghosh D., Mehra D.K., "FRESH Filter-Based Spectrum Sensing in the Presence of Cyclic Frequency Offset", IEEE Wireless Communications Letters , vol.5, issue 2 , (DOI - 10.1109/LWC.2015.2506908) ,pp.124-127, [2016].

21. Chopra R., Ghosh D., Mehra D.K., "Spectrum sensing for cognitive radios based on space-time fresh filtering", IEEE Transactions on Wireless Communications , vol.13, issue 7 , (DOI - 10.1109/TWC.2014.2314125) ,pp.3903-3913, [2014].

Conference Publications

1. Chowdhury A., Chopra R., Murthy C.R., Suraweera H.A., "On the Achievable Rates of Full-Duplex Massive MIMO Systems under Channel Aging", IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC , vol.2019-July , (DOI - 10.1109/SPAWC.2019.8815448) [2019].

2. Chopra R., "Uplink training for massive MIMO systems under channel aging", SPCOM 2018 - 12th International Conference on Signal Processing and Communications , (DOI - 10.1109/SPCOM.2018.8724413) ,pp.352-356, [2018].

3. Chopra R., Murthy C.R., Annavajjala R., "Multistream Distributed Cophasing", IEEE Transactions on Signal Processing , vol.65, issue 4 , (DOI - 10.1109/TSP.2016.2625263) ,pp.1042-1057, [2017].

4. Chopra R., Murthy C.R., Annavajjala R., "Multi-stream distributed co-phasing: Design and analysis", IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC , vol.2016-August , (DOI - 10.1109/SPAWC.2016.7536849) [2016].