Connected Autonomy

This page provides key resources on the research results developed by our group with respect to Connected Autonomy.

Journal Publications:

• 1. T. Zeng, O. Semiari, M. Chen, W. Saad, and M. Bennis, "Federated Learning on the Road: Autonomous Controller Design for Connected and Autonomous Vehicles", IEEE Transactions on Wireless Communications, to appear, 2022.

  2. D. Gupta, A. Karati, W. Saad, and D. da Costa Benevides, "Quantum-Defended Blockchain-Assisted Data Authentication Protocol for Internet of Vehicles", IEEE Transactions on Vehicular Technology, vol. 71, no. 3, pp. 3255 - 3266, March 2022.

  3. Q. Zhang, A. Ferdowsi, W. Saad, and M. Bennis, "Distributed Conditional Generative Adversarial Networks (GANs) for Data-Driven Millimeter Wave Communications in UAV Networks", IEEE Transactions on Wireless Communications, vol. 21, no. 3, pp. 1438 - 1452, March 2022.

  4. M. M. U. Chowdhury, I. Guvenc, W. Saad, and A. Bhuyan, "Ensuring Reliable Connectivity to Cellular-Connected UAVs with Uptilted Antennas and Interference Coordination," ITU Journal on Future and Evolving Technologies, to appear, 2021.

  5. M. Dabiri, S. Khankalantary, I. S. Ansari, Md. J. Piran, W. Saad, and C. S. Hong, "UAV-Assisted Free Space Optical Communication System with Amplify-and-Forward Relaying", IEEE Transactions on Vehicular Technology, to appear, 2021.

  6. Z. Mahrez, E. Sabir, E. Badidi, W. Saad, and M. Sadik, "Smart Urban Mobility: When Mobility Systems Meet Smart Data", IEEE Transactions on Intelligent Transportation Systems, to appear, 2021.

  7. A. Ferdowsi, M. A. Abd-Elmagid, W. Saad, H. S. Dhillon, "Neural Combinatorial Deep Reinforcement Learning for Age-optimal Joint Trajectory and Scheduling Design in UAV-assisted Networks", IEEE Journal on Selected Areas in Communications (JSAC), Special Issue on Age of Information in Real-time Systems and Networks, to appear, 2021.

  8. I. Donevski, N. Babu, J. J. Nielsen, P. Popovski, and W. Saad, "Federated Learning with a Drone Orchestrator: Path Planning for Minimized Staleness", IEEE Open Journal of the Communications Society, to appear, 2021.

  9. A. Manzoor, K. Kim, S. R. Pandey, S. M. A. Kazmi, N. H. Tran, W. Saad, and C. S. Hong, "Ruin Theory for Energy-Efficient Resource Allocation in UAV-assisted Cellular Networks", IEEE Transactions on Communications, to appear, 2021.

  10. L. Xu, M. Chen, M. Chen, Z. Yang, C. Chaccour, W. Saad, and C. S. Hong, "Joint Location, Bandwidth and Power Optimization for THz-enabled UAV Communications", IEEE Communications Letters, to appear, 2021.

  11. A. Pourranjbar, G. Kaddoum, A. Ferdowsi, and W. Saad, "Reinforcement Learning for Deceiving Reactive Jammers in Wireless Networks", IEEE Transactions on Communications, to appear, 2021.

  12. S. Ghosh, M. Bhatnagar, and W. Saad, "Defending False Data Injection on State Estimation over Fading Wireless Channels", IEEE Transactions on Information Forensics and Security, to appear, 2021

  13. A. El-Dosouky, W. Saad, and N. B. Mandayam, "Resilient Critical Infrastructure: Bayesian Network Analysis and Contract-Based Optimization", Reliability Engineering and System Safety, vol. 205, January 2021.

  14. A. Ferdowsi, W. Saad, and N. B. Mandayam, "Colonel Blotto Game for Sensor Protection in Interdependent Critical Infrastructure", IEEE Internet of Things Journal, vol. 8, no. 4, pp. 2857 - 2874, February 2021.

  15. Q. Zhang, W. Saad, M. Bennis, X. Lu, M. Debbah, and W. Zuo, "Predictive Deployment of UAV Base Stations in Wireless Networks: Machine Learning Meets Contract Theory", IEEE Transactions on Wireless Communications, vol. 20, no. 1, pp. 637 - 652, January 2021.

  16. Y. K. Tun, N. H. Tran, W. Saad, S. R. Pandey, and C. S. Hong, "Energy-Efficient Resource Management in UAV-Assisted Mobile Edge Computing", IEEE Communications Letters, vol. 25, no. 1, pp. 249 - 253, January 2021.

  17. A. Sanjab, W. Saad, and T. Başar, "A Game of Drones: Cyber-Physical Security of Time-Critical UAV Applications with Cumulative Prospect Theory Perceptions and Valuations", IEEE Transactions on Communications, vol. 68, no. 11, pp. 6990 - 7006, November 2020.

  18. Y. Wang, M. Chen, Z. Yang, T. Luo. and W. Saad, "Deep Learning for Optimal Deployment of UAVs with Visible Light Communications", IEEE Transactions on Wireless Communications, vol. 19, no. 11, pp. 7049 - 7063, November 2020.

  19. R. Amer, W. Saad, and N. Marchetti, "Mobility in the Sky: Performance and Mobility Analysis for Cellular-Connected UAVs", IEEE Transactions on Communications, vol. 68, no. 5, pp. 3229 - 3246, May 2020.

  20. A. El-Dosouky, A. Ferdowsi, and W. Saad, "Drones in Distress: A Game-Theoretic Countermeasure for Protecting UAVs Against GPS Spoofing", IEEE Internet of Things Journal, vol. 7, no. 4, pp. 2840 - 2854, April 2020.

  21. M. T. Dabiri , H. Safi, S. Parsaeefard , and W. Saad, "Analytical Channel Models for Millimeter Wave UAV Networks Under Hovering Fluctuations", IEEE Transactions on Wireless Communications, vol. 19, no. 4, pp. 2868 - 2883, April 2020.

  22. R. Amer, W. Saad, and N. Marchetti, "Towards a Connected Sky: Performance of Beamforming with Down-tilted Antennas for Ground and UAV User Co-existence", IEEE Communications Letters, vol. 23, no. 10, pp. 1840-1844, Oct. 2019.

  23. Y. Yang, M. Chen, C. Guo, C. Feng, and W. Saad, "Power Efficient Visible Light Communication (VLC) with Unmanned Aerial Vehicles (UAVs)", IEEE Communications Letters, vol. 23, no. 7, pp. 1272-1275, July 2019.

  24. M. Mozaffari, W. Saad, M. Bennis, Y.-H. Nam, and M. Debbah, "A Tutorial on UAVs for Wireless Networks: Applications, Challenges, and Open Problems", IEEE Communications Surveys and Tutorials, vol. 21, no. 3, pp. 2334-2360, Thirdquarter 2019.

  25. M. Mozaffari, A. T. Z. Kasgari, W. Saad, M. Bennis, and M. Debbah, "Beyond 5G with UAVs: Foundations of a 3D Wireless Cellular Network", IEEE Transactions on Wireless Communications, vol. 18, no. 1, pp. 357–372, January 2019.

  26. U. Challita, W. Saad, and C. Bettstetter, "Interference Management for Cellular-Connected UAVs: A Deep Reinforcement Learning Approach", IEEE Transactions on Wireless Communications, vol. 18, no.4, pp. 2125-2140, April 2019.

  27. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Communications and Control for Wireless Drone-Based Antenna Array", IEEE Transactions on Communications, vol. 67, no. 1, pp. 820 - 834, January 2019.

  28. M. I. Ashraf, C.-F. Liu, M. Bennis, W. Saad, and C. S. Hong, "Dynamic Resource Allocation for Optimized Latency and Reliability in Vehicular Networks", IEEE Access, vol. 6, pp. 63843 - 63858, October 2018.

  29. N. Abuzainab and W. Saad, "Dynamic Connectivity Game for Adversarial Internet of Battlefield Things Systems", IEEE Internet of Things Journal, vol. 5, no. 1, pp. 378 - 390, February 2018.

  30. Sudheesh P. G., M. Mozaffari, M. Magarini, W. Saad, and P. Muthuchidambaranathan, "Sum-Rate Analysis for High Altitude Platform (HAP) Drones with Tethered Balloon Relay", IEEE Communications Letters, vol. 22, no. 6, pp. 1240 - 1243, June 2018.

  31. O. Semiari, W. Saad, M. Bennis, and B. Maham, "Caching Meets Millimeter Wave Communications for Enhanced Mobility Management in 5G Networks", IEEE Transactions on Wireless Communications, vol. 17, no. 2, pp. 779 - 793, February 2018.

• 32. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Wireless Communication using Unmanned Aerial Vehicles (UAVs): Optimal Transport Theory for Hover Time Optimization", IEEE Transactions on Wireless Communications, vol. 16, no. 12, pp. 8052 - 8066, December 2017.

  33. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Mobile Unmanned Aerial Vehicles (UAVs) for Energy-Efficient Internet of Things Communications", IEEE Transactions on Wireless Communications, vol. 16, no. 11, pp. 7574 - 7589, November 2017.

  34. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Optimal Transport Theory for Cell Association in UAV-Enabled Cellular Networks", IEEE Communications Letters, vol. 21, no. 9, pp. 2053 - 2056, September 2017.

  35. M. Chen, M. Mozaffari, W. Saad, C. Yin, M. Debbah, and C. S. Hong, "Caching in the Sky: Proactive Deployment of Cache-Enabled Unmanned Aerial Vehicles for Optimized Quality-of-Experience", IEEE Journal on Selected Areas in Communications (JSAC), Special Issue on Human-In-The-Loop Mobile Networks, vol. 35, no. 5, pp. 1046 - 1061, May 2017.

  36. K. Vasudeva, S. Dikmese, I. Guvenc, A. Mehbodniya, W. Saad, and F. Adachi, "Fuzzy-Based Game Theoretic Mobility Management for Energy Efficient Operation in HetNets", IEEE Access, 2017.

  37. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Efficient Deployment of Multiple Unmanned Aerial Vehicles for Optimal Wireless Coverage", IEEE Communications Letters, vol. 20, no. 8, pp. 1647-1650, August 2016.

  38. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Unmanned Aerial Vehicle with Underlaid Device-to-Device Communications: Performance and Tradeoffs," IEEE Transactions on Wireless Communications, vol. 15, no. 6, pp. 3949 - 3963, June 2016. IEEE Communications Society Young Author Best Paper Award.

Conferences Publications:

1. R. Vera-Amaro, M. Burke, and W. Saad, "Coordinated UAVs for Effective Payload Delivery", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Selected Areas in Communications: Aerial Communications Track, Rio de Janeiro, Brazil, December 2022.

2. X. Fan, D. Moscovitz, and W. Saad, "A Data-Driven Democratized Control Architecture for Regional Transmission Operators", Proc. IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT), New Orleans, LA, USA, April 2022.

3. T. Zeng, O. Semiari, W. Saad, and M. Bennis, "Performance Analysis of Aircraft-to-Ground Communication Networks in Urban Air Mobility (UAM)", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Next Generation Networking and Internet Symposium, Madrid, Spain, December 2021.

4. T. Zeng, O. Semiari, M. Chen, W. Saad, and M. Bennis, "Federated Learning for Collaborative Controller Design of Connected and Autonomous Vehicles", in Proc. of the 60th IEEE Conference on Decision and Control (CDC), Austin, TX, USA, December 2021.

5. A. Pourranjbar, G. Kaddoum, and W. Saad, "Jamming Pattern Recognition over Multi-Channel Networks: A Deep Learning Approach", in Proc. of the 55th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, November 2021.

6. T. Zeng, J. Guo, K. J. Kim, K. Parsons, P. Orlik, S. Di Cairano, and W. Saad, "Multi-Task Federated Learning for Traffic Prediction and its Application to Route Planning", in Proc. of the IEEE Intelligent Vehicles Symposium (IV), Nagoya, Japan, July 2021.

7. J. Liu, Y. Xiao, Y. Li, G. Shi, W. Saad, and H. V. Poor, "Spatio-temporal Modeling for Large-scale Vehicular Networks Using Graph Convolutional Networks", in Proc. of the IEEE International Conference on Communications (ICC), Next-Generation Networking and Internet Symposium, Montreal, Canada, June 2021.

8. Q. Zhang, W. Saad, and M. Bennis, "Distributional Reinforcement Learning for mmWave Communications with Intelligent Reflectors on a UAV", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Next Generation Networking and Internet Symposium, Taipei, Taiwan, December 2020.

9. G. Lee, J. Guo, K. J. Kim, P. Orlik, H. Ahn, S. Di Cairano, and W. Saad, "Edge Computing for Interconnected Intersections in Internet of Vehicles", in Proc. of the IEEE Intelligent Vehicles Symposium (IV), Las Vegas, NV, USA, June 2020.

10. T. Zeng, O. Semiari, M. Mozaffari, M. Chen, W. Saad, and M. Bennis, "Federated Learning in the Sky: Joint Power Allocation and Scheduling with UAV Swarms", in Proc. of the IEEE International Conference on Communications (ICC), Next-Generation Networking and Internet Symposium, Dublin, Ireland, June 2020.

11. R. Amer, W. Saad, B. Galkin, and N. Marchetti, "Performance Analysis of Mobile Cellular-Connected Drones under Practical Antenna Configurations", in Proc. of the IEEE International Conference on Communications (ICC), Mobile and Wireless Networks Symposium, Dublin, Ireland, June 2020.

12. X. Zhang, Y. Xiao, Q. Li, and W. Saad, "Deep Reinforcement Learning for Fog Computing-based Vehicular System with Multi-operator Support", in Proc. of the IEEE International Conference on Communications (ICC), SAC Cloud & Fog Computing, Networking, and Storage Track, Dublin, Ireland, June 2020.

13. M. U. Chowdhury, W. Saad, and I. Guvenc, "Mobility Management for Cellular-Connected UAVs: A Learning-Based Approach", in Proc. of the IEEE International Conference on Communications (ICC), Workshop on Edge Machine Learning for 5G Mobile Networks and Beyond, Dublin, Ireland, June 2020.

14. X. Liu, M. Chen, S. Wang, W. Saad, and C. Yin, "Trajectory Design for Energy Harvesting UAV Networks: A Foraging Approach", in Proc. of IEEE Wireless Communications and Networking Conference (WCNC), Wireless Networks Track, Seoul, South Korea, April 2020.

15. T. Zeng, O. Semiari, W. Saad, and M. Bennis, "Dependence Control for Reliability Optimization in Vehicular Networks", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Next-Generation Networking and Internet Symposium, Waikoloa, HI, USA, December 2019.

16. Q. Zhang, W. Saad, and M. Bennis, "Reflections in the Sky: Millimeter Wave Communication with UAV-Carried Intelligent Reflectors", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Next-Generation Networking and Internet Symposium, Waikoloa, HI, USA, December 2019.

17. M. A. Abd-Elmagid, A. Ferdowsi, H. S. Dhillon, and W. Saad, "Deep Reinforcement Learning for Minimizing Age-of-Information in UAV-assisted Networks", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Mobile and Wireless Networks Symposium, Waikoloa, HI, USA, December 2019.

18. A. El-Dosouky, A. Ferdowsi, and W. Saad, "Deceiving GPS Spoofers: A Game Theoretic Countermeasure for Wireless Drones", in Proc. IEEE Conference on Communications and Network Security (Poster Track), Washington, DC, June 2019.

19. T. Zeng, O. Semiari, W. Saad, and M. Bennis, "Joint Communication and Control System Design for Connected and Autonomous Vehicle Navigation", in Proc. of the IEEE International Conference on Communications (ICC), Next-Generation Networking and Internet Symposium, Shanghai, China, May 2019.

20. G. M. M. Hasan, M. A. Rahman, M. Manshaei, and W. Saad, "A Game-Theoretic Analysis of Pricing Competition between Aggregators in V2G Systems", in Proc. of IEEE 43rd Annual Computer Software and Applications Conference (COMPSAC), Milwaukee, WI, USA, July 2019.

21. R. Amer, W. Saad, H. Elsawy, M. Butt, and N. Marchetti, "Caching to the Sky: Performance Analysis of Cache-Assisted CoMP for Cellular-Connected UAVs", in Proc. of IEEE Wireless Communications and Networking Conference (WCNC), Wireless Networks Track, Marrakech, Morocco, April 2019.

22. A. French, M. Mozaffari, A. El-Dosouky, and W. Saad, "Environment-Aware Deployment of Wireless Drones Base Stations with Google Earth Simulator", in Proc. of IEEE International Conference on Pervasive Computing (PerCom), Workshop on UNmanned aerial vehicle Applications in the Smart City: from Guidance technology to enhanced system Interaction (UNAGI), Kyoto, Japan, March 2019.

23. A. Ferdowsi and W. Saad, "A Colonel Blotto Game for Security of Interdependent Intelligent Transportation and Communications Systems", in Proc. of International Conference on Emerging Technologies of Information and Communications (ETIC), Bhutan, 2019.

24. M. Mozaffari, A. T. Z. Kasgari, W. Saad, M. Bennis, and M. Debbah, "3D Cellular Network Architecture with Drones for Beyond 5G", in Proc. of the IEEE Global Communications Conference (GLOBECOM),Next Generation Networking and Internet Symposium, Abu Dhabi, UAE, December 2018.

25. Q. Zhang, M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Machine Learning for Predictive On-Demand Deployment of UAVs for Wireless Communications", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Green Communications Systems and Networks Symposium, Abu Dhabi, UAE, December 2018.

26. G. Lee, W. Saad, and M. Bennis, "Online Optimization for UAV-assisted Distributed Fog Computing in Smart Factories of Industry 4.0", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Selected Areas in Communications Symposiums - Internet of Things Track, Abu Dhabi, UAE, December 2018.

27. S. Samarakoon, M. Bennis, W. Saad, and M. Debbah, "Federated Learning for Ultra-Reliable Low-Latency V2V Communications", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Selected Areas in Communications Symposium - Tactile Internet Track, Abu Dhabi, UAE, December 2018.

28. M. K. Tareq, O. Semiari, M. A. Salehi, and W. Saad, "Ultra Reliable, Low Latency Vehicle-to-Infrastructure Wireless Communications with Edge Computing", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Mobile and Wireless Networks Symposium, Abu Dhabi, UAE, December 2018.

29. M. Monwar, O. Semiari, and W. Saad, "Optimized Path Planning for Inspection by Unmanned Aerial Vehicles Swarm with Energy Constraints", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Ad Hoc and Sensor Networks Symposium, Abu Dhabi, UAE, December 2018.

30. A. Ferdowsi, U. Challita, W. Saad, and N. B. Mandayam, "Robust Deep Reinforcement Learning for Security and Safety in Autonomous Vehicle Systems", in Proc. 21st IEEE International Conference on Intelligent Transportation Systems, Maui, HI, USA, November 2018.

31. T. Zeng, M. Mozaffari, O. Semiari, W. Saad, M. Bennis, and M. Debbah, "Wireless Communications and Control for Swarms of Cellular-Connected UAVs", in Proc. of the 52nd Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, November 2018.

32. T. Zeng, O. Semiari, W. Saad, and M. Bennis, "Integrated Communications and Control Co-Design for Wireless Vehicular Platoon System", in Proc. of the IEEE International Conference on Communications (ICC), SAC Symposium Smart Cities Track, Kansas City, MO, USA, May 2018.

33. U. Challita, W. Saad, and C. Bettstetter, "Deep Reinforcement Learning for Interference-Aware Path Planning of Cellular-Connected UAVs", in Proc. of the IEEE International Conference on Communications (ICC), Wireless Networking Symposium, Kansas City, MO, USA, May 2018.

34. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Drone-based Antenna Array for Service Time Minimization in Wireless Networks", in Proc. of the IEEE International Conference on Communications (ICC), Wireless Networking Symposium, Kansas City, MO, USA, May 2018.

35. M. Chen, W. Saad, and C. Yin, "Echo State Learning for Wireless Virtual Reality Resource Allocation in UAV-enabled LTE-U Networks", in Proc. of the IEEE International Conference on Communications (ICC), Cognitive Radio Networking Symposium, Kansas City, MO, USA, May 2018.

36. T. Zeng, O. Semiari, and W. Saad, "Spatio-Temporal Motifs for Optimized Vehicle-to-Vehicle (V2V) Communications", in Proc. of IEEE International Conference on Computing, Networking and Communications (ICNC), Mobile Computing and Vehicle Communications Track, Maui, HI, USA, March 2018.

37. U. Challita and W. Saad, "Network Formation in the Sky: Unmanned Aerial Vehicles for Multi-hop Wireless Backhauling", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Next Generation Networking and Internet Symposium, Singapore, December 2017.

38. O. Semiari, W. Saad, M. Bennis, and B. Maham, "Mobility Management for Heterogeneous Networks: Leveraging Millimeter Wave for Seamless Handover", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Mobile and Wireless Networks Symposium, Singapore, December 2017.

39. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Performance Optimization for UAV-Enabled Wireless Communications under Flight Time Constraints", in Proc. of the IEEE Global Communications Conference (GLOBECOM), Mobile and Wireless Networks Symposium, Singapore, December 2017.

40. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Optimal Transport Theory for Effective UAV-Based Wireless Communications under Flight Time Constraints", poster, in IEEE Communications Theory Workshop (CTW), June 2017.

41. I. Ashraf, M. Bennis, C. Perfecto, and W. Saad, "Dynamic Proximity-aware Resource Allocation in Vehicle-to-Vehicle (V2V) Communications," in Proc. of the IEEE Global Communications Conference (GLOBECOM), Workshop on Internet of Everything, Washington, DC, USA, December 2016

42. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Mobile Internet of Things: Can UAVs Provide an Energy-Efficient Mobile Architecture?," in Proc. of the IEEE Global Communications Conference (GLOBECOM), Selected Areas in Communications - Internet of Things Symposium, Washington, DC, USA, December 2016.

43. D. Athukoralage, I. Guvenc, W. Saad, and M. Bennis, "Regret Based Learning for UAV assisted LTE-U/WiFi Public Safety Networks," in Proc. of the IEEE Global Communications Conference (GLOBECOM), Mobile and Wireless Networks Symposium, Washington, DC, USA, December 2016.

44. M. S. Nourbakhsh, M. H. Manshaei, M. A. Rahman, and W. Saad, "Electric Vehicle Consumption Markets: An Economic Analysis," invited, in Proc. of the IEEE Global Conference on Signal and Information Processing (GlobalSIP), Washington, DC, USA, December 2016.

45. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Optimal Transport Theory for Power-Efficient Deployment of Unmanned Aerial Vehicles," in Proc. of the IEEE International Conference on Communications (ICC), Wireless Communications Symposium, Kualalumpur, Malaysia, May 2016.

46. M. Mozaffari, W. Saad, M. Bennis, and M. Debbah, "Drone Small Cells in the Clouds: Design, Deployment and Performance Analysis," in Proc. of the IEEE Global Communications Conference (GLOBECOM), Wireless Networks Symposium, San Diego, CA, USA, December 2015.