Abstract
Paper presents the developed algorithm for multi-carrier simultaneous vertical ionospheric sounding by OFDM signal with BPSK modulation of subcarriers. There is presented a mathematical model, numerical and simulation modeling with the use of USRP platform. Research findings proved the fundamental feasibility of using orthogonal subcarriers for simultaneous sounding of channels over a wide band.
Highlights
State-of-the-art wireless communication technologies, including cognitive radio [1], employ methods of finding optimal radio channels from the available at that time channels by means of sounding
binary phase-shift keying (BPSK) signal duration can be increased by the coherent integration of several echoes over the channel coherence time
It can be implemented by means of Orthogonal Frequency-Division Multiplexing (OFDM) signal with BPSK for spreading the spectrum of each carrier
Summary
State-of-the-art wireless communication technologies, including cognitive radio [1], employ methods of finding optimal radio channels from the available at that time channels by means of sounding. An alternative approach can be a simultaneous sounding at each carrier It can be implemented by means of Orthogonal Frequency-Division Multiplexing (OFDM) signal with BPSK for spreading the spectrum of each carrier. In this case, the sounding session time does not depend on the number of carriers and is determined only by the time of integration of the signal energy. Sounding the ionosphere and HF communication channels requires considering the features of the problem and signal propagation conditions. The developed OFDM ionosonde was implemented with the use of Universal Software Radio Peripheral (USRP) platform supported by the groundbreaking software-defined radio (SDR) technology
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