Technologies for emergency rollout of broadband public protection and disaster relief (BB-PPDR) communications in humanitarian crisis zones

The PPDR communications are used by first responders in humanitarian crisis zones constituting a vital service for saving lives. The international telecommunication regulation organisations are fostering the use of broadband services to expand the usability of PPDR communications in emergencies, and promoting more efficient and agile spectrum usage in interference-prone scenarios like those potentially appearing in the borders of neighbouring countries. The BB-PPRDR radios require highly performing and flexible waveform technologies to accommodate the local spectrum landscape and coexist with adjacent or in-band secondary or co-primary transmissions. Therefore, both maximising the spectral efficiency demanded by the broadband services and meeting the spectral emission requirements to avoid interference to the coexisting signals are needed. To meet the spectral efficiency requirements, multi -carrier modulations that generate highPAPR waveforms are employed. Such waveforms put stringent requirements on the RF transceivers and the PA, which cannot be efficiently operated as significant back -off needs to be taken to meet the linearity requirements. Highly energy efficient radios are also a must in emergency rollouts where the access to the energy supply can be constrained.