Matched-filter radio receiver

A digital radio receiver adapted to receive phase- or frequency-modulated radio signals, wherein:

• the receiver comprises a matched filter bank, having a plurality of filter modules, for demodulating a sampled signal, each filter module corresponding to a respective filter sequence that spans a plurality of symbol periods, and being configured to cross-correlate the sampled signal with a representation of the filter sequence, the cross-correlation involving a plurality of samples at each of the plurality of symbol periods;
• the matched filter bank is configured to calculate and store first data representing values, for respective discrete symbol periods, of a cross-correlation of the sampled signal with a first predetermined complex exponential function defined at a plurality of sample points over one symbol period, and to calculate and store second data representing values, for the respective discrete symbol periods, of a cross-correlation of the sampled signal with a second predetermined complex exponential function defined at a plurality of sample points over one symbol period, the second complex exponential function being different from the first complex exponential function;
• and
• at least two of the filter modules are configured to cross-correlate the sampled signal with representations of their respective filter sequences using an algorithm that takes, as input, values from the first data corresponding to one or more symbol periods at which the respective filter sequence has a first value, and values from the second data corresponding to one or more symbol periods at which the respective filter sequence has a second value, different from the first value.