Scalable OFDM Systems for PPDR Communications

Abstract

This paper provides a design of orthogonal frequency division multiplexing (OFDM) system for public protection and disaster relief (PPDR) communications. Considering various emergency situations which require high data rate on fast fading channels, we experiment on bit error rate (BER) performance of various OFDM systems. From the simulations, we suggest that using 256 subcarriers with 32 time samples for guard interval is satisfactory in 4.9 GHz band with 5 MHz bandwidth. Supporting 20 MHz scalability, we employ the multiband-OFDM (MB-OFDM) architecture proposing the greedy-type channel allocation algorithm. Numerical results are performed to confirm our results.