| 摘要 |
<p>A digital radio receiver receives and captures an input digital signal (12) which may, for example, be in the form of complex numbers representing symbols of the received signal at baseband. This received signal is fed into a correlator (1), signal quality estimator (2) and a position adjuster (3). The correlator (1) correlates a selected portion of the received symbols with a set of reference symbol sequences and produces a correlation parameter as a function of delay over a finite window of time for each reference symbol sequence. In addition to the above correlation parameter determination, the signal quality estimator (2) analyses the received signal and produces a signal quality estimate for each set of correlation parameters. The estimated signal quality is passed to the synchronisation position and training sequence estimator (4) along with the set of correlation parameters from the correlator (1). The synchronisation position and training sequence estimator (4) uses the signal quality estimate and correlation parameters to compute a decision function which is used to select the optimum synchronisation position and training sequence identity for the selected portion of input signal received.</p> |
