Out-of-Band Sensing Scheme for Dynamic Frequency Hopping in Satellite Communications
This paper makes preliminary steps at exploring a novel application of Cognitive Radios (CRs) for reliable satellite communications. The authors propose the use of dynamically adjusted Frequency Hopping (FH) sequences for satellite transmissions. Such sequences are more robust against smart eavesdropping and targeted interference than fixed FH sequences. In their approach, FH sequence is adjusted according to the outcome of out-of-band sensing, carried out by a CR module that resides in the satellite itself or at the receiving ground station. Their protocol, called OSDFH, relies on exploiting the spectrum sensing capabilities of CRs for proactive detection of channel quality.