A machine learning model -based radio receiver with both time and frequency domain processing in the machine learning model, and related methods and computer programs

A method comprising:

• receiving, at a radio receiver device, a radio signal comprising information bits;
• and
• determining, by the radio receiver device, log-likelihood ratios, LLRs, of the information bits,
• wherein the determining of the LLRs comprises applying a machine learning, ML, model to a frequency domain representation of the received radio signal over a transmission time interval, TTI, the ML model being executable to process the frequency domain representation of the received radio signal and to output estimates of the LLRs based on results of the processing, and the ML model comprising at least:
• a first frequency domain processing block;
• at least one inverse fast Fourier transform, IFFT, block subsequent to the first frequency domain processing block;
• a time domain processing block subsequent to the IFFT block;
• and
• at least one fast Fourier transform, FFT, block subsequent to the time domain processing block.

A computer program comprising instructions for causing a radio receiver device to perform at least the following:

• receiving a radio signal comprising information bits;
• and
• determining log-likelihood ratios, LLRs, of the information bits,
• wherein the determining of the LLRs comprises applying a machine learning, ML, model to a frequency domain representation of the received radio signal over a transmission time interval, TTI, the ML model being executable to process the frequency domain representation of the received radio signal and to output estimates of the LLRs based on results of the processing, and the ML model comprising at least:
• a first frequency domain processing block;
• at least one inverse fast Fourier transform, IFFT, block subsequent to the first frequency domain processing block;
• a time domain processing block subsequent to the IFFT block;
• and
• at least one fast Fourier transform, FFT, block subsequent to the time domain processing block.