IIT Mandi Develops Technology to Overcome Spectrum Shortages in Future Wireless Communication Applications

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This cooperative spectrum sensor (CSR) developed by researchers can be used in future 5G and 6G wireless communication technologies to improve spectral efficiency and will also help establish broadband services in remote and rural areas of the country. .

Researchers from the Indian Institute of Technology Mandi have developed cutting-edge solutions in telecommunications technologies. The recent development of cooperative spectrum sensors improves the reusability of the radio frequency spectrum to meet the increasing data communication demands in future wireless communication applications.

The results of their work have recently been published in IEEE Transactions on Consumer Electronics and other IEEE journals such as IEEE Transactions on Very Large-Scale Integration (VLSI) Systems and IEEE Transactions on Circuits and Systems – I. These articles have been written by Dr. Rahul Shrestha, Assistant Professor, School of Computer Science and Electrical Engineering, IIT Mandi, and his PhD student Rohit B. Chaurasiya.

Radio frequency waves, or “spectrum” as they are known in the telecommunications field, are low-energy radiation used in wireless communications. Wireless radio frequency spectrum is a limited resource and is allocated by governments to telecommunications companies through a licensing process. The rapid growth of wireless communication technology in recent years and the exponential increase predicted due to the mass adoption of technologies such as the new fifth-generation radio (5G-NR) and the Internet of Things ( IoT) are expected to drive massive demand. for spectrum bands.

Highlighting the need for research in the area of ​​spectrum optimization, Dr. Rahul Shrestha, Assistant Professor, IIT Mandi, said, “Given the policy of fixed spectrum allocation by many governments around the world, including our own, it becomes important to use the available spectrum intelligently. Cognitive radio technology is considered one of the best ways to optimize spectrum usage.

Not all parts of the spectrum band licensed to a telecommunications company (known as a primary user or UP) are permanently used by the UP. Cognitive Radio Technology’s idea is that a wireless device such as a cell phone, used by the secondary user (SU) can be equipped with a special sensor capable of detecting such “spectrum holes”, ( parts of the spectrum that are not used by the PU) and use them when the main channel is unavailable or congested. This forms the basis of a dynamic spectrum access policy that can overcome shortages of spectrum available at any given time. The in-device spectra hole detection sensor of the SU is called a stand-alone spectra sensor (SSSR).

The team’s research aims to circumvent the above problem. The work addresses a technology in which the wireless device at the SU end is not equipped with an SSSR, but instead transmits the received portions of the spectrum band to a Data Fusion Center (DFC). The DFC then digitizes these parts and processes them using a single Cooperative Spectrum Sensor (CSR) instead of using the device-level SSSR. The trusted decision is broadcast to all SU devices for opportunistic communication.

This digital CSR ASIC chip developed by IIT Mandi provides excellent PU detection reliability in real channel scenarios with best hardware efficiency and fast detection time. The CSR chip can be used with any portable wireless mobile communication device to access unused spectrum. Specifically, it can be used in future 5G and 6G wireless communication technologies to improve spectral efficiency.

Additionally, it will enable mass deployment of IoT-based networks where many connected devices can use spectrum holes for uninterrupted communication. The specific uses of cooperative spectrum sensing technology in India cannot be underestimated and will help establish broadband services in remote and rural parts of the country.

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