11.1 INTRODUCTION11.2 SIGNAL CLASSIFICATION PROBLEM IN A WIDEBAND COGNITIVE RADIO11.3 FEATURE EXTRACTION FOR SIGNAL CLASSIFICATION11.4 A SIGNAL CLASSIFICATION ARCHITECTURE FOR A WIDEBAND COGNITIVE RADIO11.5 BAYESIAN NONPARAMETRIC SIGNAL CLASSIFICATION11.6 SEQUENTIAL BAYESIAN NONPARAMETRIC SIGNAL CLASSIFICATION11.7 SUMMARY