Adaptive subcarrier modulation for indoor public safety body-to-body networks

In this contribution, we present the Bit Error Rate characteristics for an indoor, wideband body-to-body channel between two firefighters when using IEEE 802.11 ac, which is proven a very suitable standard for future, wideband public safety networks. Moreover, the BER and throughput characteristics, when applying both transmission blocking, fixed and adaptive, subcarrier modulation are presented. These characteristics show an increased throughput when applying adaptive subcarrier modulation. We have conducted a wideband, indoor channel sounder campaign at 3.6 GHz with 120 MHz useful bandwidth, simulating real-life rescue operations performed by two simultaneously moving members of the Rapid Intervention Team. Both firefighters were equipped with low-profile, light-weight and energy-efficient Ultra Wideband Cavity-Backed slot antennas in Substrate Integrated Waveguide technology, unobtrusively deployed inside the front and back sections of their jackets, providing 2 × 2 MIMO capability.

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