| 摘要 |
A digital radio receiver adapted to receive radio signals modulated using continuous phase frequency shift keying. The receiver comprises means for receiving an analogue radio signal (2) having a carrier frequency, a correlator (8) arranged to estimate a frequency offset between said carrier frequency and a nominal carrier frequency, means comprising a phase accumulator block (12) and a complex rotator (4) for correcting for said frequency offset, and a matched filter bank (MFB) which receives the compensated signal and comprises a plurality of filters (20), each of which corresponds to a different bit pattern for determining a bit sequence from said analogue radio signal, and also a module (24) which determines the filter that gives the maximum output and a majority vote module (28). The output of the MFB is also sent to a frequency drift estimator (14) which is used in the frequency offset estimation. |
