mmWave Communication
In recent years, the explosive growth of mobile data traffic has led to an ever-growing demand for much higher capacity
and lower latency in wireless networks. It has culminated in the development of the fifth generation (5G) wireless communication systems, expected to be deployed by the year 2020, with key goals of data rates in the range of Gbps, billions of connected devices, lower latency, improved coverage and reliability, and low-cost, energy efficient and environment friendly operation. Currently, the deployment of Long Term Evolution (LTE) systems has provided a timely capacity boost to cellular networks. However, to meet the ever-increasing demands in wireless traffic which is projected to increase by about 1000 fold by the year 2020, and keeping in mind that the current wireless spectrum is almost saturated, it is imperative to shift the paradigm of cellular spectrum to a new range of frequencies. In this regard, Millimeter wave (mmWave) bands with significant amounts of unused or lightly used bandwidths appear to be a viable way to move forward. With bands of 20-100 GHz available for communication, mmWave can be the cornerstone in the design of 5G networks.
Research
Members Involved : A. Bishnu, J. Zhang
Mmwave spectrum will function differently from the microwave spectrum (< 6GHz), and as such, communication in mmwave network is hindered by factors that have little or no consequence at lower frequencies. We investigate the potential benefits of deploying relays in outdoor millimeter-wave (mmWave) networks. We present a relay modeling technique for mmWave networks considering blockages and compute the density of active relays that aid the transmission. Two relay selection techniques are discussed, namely best path selection and best relay selection. We analyze the end-to-end signal to noise ratio (SNR) and compute the best random relay path in a mmWave network using order statistics. Moreover, the maximum end-to-end SNR of random relay paths is investigated asymptotically by using extreme value theory. Furthermore, we also analysis of secure communication in millimetre wave networks. We explore on the possibilities of a secure network aided by blockages and accordingly design certain security regions, in which secure transmission can be guaranteed.
In our group, we also study precoding to ensure efficient transmission of information from one point to another. We note that due to the propagation characteristics at these high frequencies, path loss is a limiting factor, therefore, we design large arrayed systems that provide high gain to overcome these losses. Mmwave communication is also affected by blockages due to their short wavelengths. Our current focus is on modelling blockage effects in addition to the precoding to improve the spectral and energy efficiency in such networks
Publications
and lower latency in wireless networks. It has culminated in the development of the fifth generation (5G) wireless communication systems, expected to be deployed by the year 2020, with key goals of data rates in the range of Gbps, billions of connected devices, lower latency, improved coverage and reliability, and low-cost, energy efficient and environment friendly operation. Currently, the deployment of Long Term Evolution (LTE) systems has provided a timely capacity boost to cellular networks. However, to meet the ever-increasing demands in wireless traffic which is projected to increase by about 1000 fold by the year 2020, and keeping in mind that the current wireless spectrum is almost saturated, it is imperative to shift the paradigm of cellular spectrum to a new range of frequencies. In this regard, Millimeter wave (mmWave) bands with significant amounts of unused or lightly used bandwidths appear to be a viable way to move forward. With bands of 20-100 GHz available for communication, mmWave can be the cornerstone in the design of 5G networks.
Research
Members Involved : A. Bishnu, J. Zhang
Mmwave spectrum will function differently from the microwave spectrum (< 6GHz), and as such, communication in mmwave network is hindered by factors that have little or no consequence at lower frequencies. We investigate the potential benefits of deploying relays in outdoor millimeter-wave (mmWave) networks. We present a relay modeling technique for mmWave networks considering blockages and compute the density of active relays that aid the transmission. Two relay selection techniques are discussed, namely best path selection and best relay selection. We analyze the end-to-end signal to noise ratio (SNR) and compute the best random relay path in a mmWave network using order statistics. Moreover, the maximum end-to-end SNR of random relay paths is investigated asymptotically by using extreme value theory. Furthermore, we also analysis of secure communication in millimetre wave networks. We explore on the possibilities of a secure network aided by blockages and accordingly design certain security regions, in which secure transmission can be guaranteed.
In our group, we also study precoding to ensure efficient transmission of information from one point to another. We note that due to the propagation characteristics at these high frequencies, path loss is a limiting factor, therefore, we design large arrayed systems that provide high gain to overcome these losses. Mmwave communication is also affected by blockages due to their short wavelengths. Our current focus is on modelling blockage effects in addition to the precoding to improve the spectral and energy efficiency in such networks
Publications
- O. Y. Kolawole, S Biswas, K Singh, and T Ratnarajah, "Transceiver Design for Energy-Efficiency Maximization in mmWave MIMO IoT Networks," IEEE Trans. on Green Communications and Networking, Vol. 4, Issue 1, pp. 109-123, March 2020..
- A. Papazafeiropoulos and T. Ratnarajah, "Nuts and Bolts of a Realistic Stochastic Geometric Analysis of mmWave HetNets: Hardware Impairments and Channel Aging," IEEE Trans on Vehicular Technology, Vol. 68, No. 6, pp. 5657-5671, June 2019..
- O. Y. Kolawole, S.Vuppala and T. Ratnarajah, "Multi-User Millimeter Wave Cloud Radio Access Networks with Hybrid Precoding," IEEE Systems Journals, Vol 12, Issue 4, pp. 3661-3672, Dec. 2018.
- S. Biswas, S.Vuppala, and T. Ratnarajah, "On the Performance of mmWave Networks aided by Wirelessly Powered Relays," IEEE Journal of Selected Topics in Signal Processing (Special Issue on Exploiting Interference towards Energy Efficient and Secure Wireless Communications), Vol. 10, No 8, pp 1522-1537, Dec. 2016.
- S.Vuppala, S. Biswas and T. Ratnarajah, "An Analysis on Secure Communication in Millimeter/Micro-Wave Hybrid Networks," IEEE Trans. on Communications, Vol. 64, No. 8, pp. 3507-3519, Aug. 2016.
- S. Biswas, S.Vuppala, J. Xue and T. Ratnarajah, "On the Performance of Relay Aided Millimeter Wave Networks," IEEE Journal of Selected Topics in Signal Processing (Special Issue on Signal Processing for Millimeter Wave Wireless Communications), Vol. 10, No. 3, pp. 576-588, April 2016.
- S. Biswas, S. Vuppala and T. Ratnarajah, "Massive 3D Antenna Array mmWave Systems," In Proc. IEEE Global Communications Conference, Singapore, 4-8 Dec. 2017.
- S Biswas, S Vuppala, J Xue, T Ratnarajah, “An Analysis on Relay Assisted Millimeter Wave Networks,” In Proc.IEEE International Conference on Communications, Kuala Lumpur, Malaysia, May 23-27, 2016,
- S Vuppala, S Biswas, T Ratnarajah, “On the Security Region of Best Source Indices in Random Wireless Networks,” In Proc IEEE International Conference on Communications, Kuala Lumpur, Malaysia, May 23-27, 2016.
- S. Vuppala, S. Biswas, T. Ratnarajah, M. Sellathurai, "Analysis of secure communication in millimetre wave networks: are blockages beneficial?," In Proc IEEE 41th International Conference on Acoustics, Speech and Signal Processing, Shanghai, China, March 20-25, 2016.
