I am having trouble to synchronize on a frequency hopping pattern between an emitter
Tx and a receiver
Rx. More precisely, the communication between
Rx uses frequency hopping spread spectrum (
FHSS) in the 2.4GHz - 2.485GHz ISM band, and I would like another
Rx to be able to synchronize on the
To do so, I thought of cutting the entire bandwidth in a set of smaller ones and, if the energy contained in one of the smaller bands is greater than the mean of the energy of all the bands, it means I have a signal in that band and that I have to use that frequency. Using
GNU Radio (22.214.171.124), a LimeSDR is connected to a
polyphase filter bank (where each filter is a low-pass one) block, each of the outputs connected to a
Stream to Vector block, a
Complex to Mag Squared block, a
threshold block, and finally some sinks to see the result. So far, I could not achieve satisfying results, and was wondering if
- the proposed method made sense ?
- it was possible to have a "dynamic" threshold to adapt to noisy environments and put the computed mean energy as threshold ?
- I use the
polyphase filter bankblock correctly ?
Thank you and have a nice day, Alex.