An improved detection method for OFDM signals

OFDM has become the main basic transmission technology replacing single carrier spread spectrum techniques in the new generation broadband wireless communication, spectrum detecting of OFDM signals has developed rapidly in the field of Cognitive radio. In the OFDM system, there is a great correlation between CP and OFDM symbols which are introduced for eliminating ISI, so the detection methods based on CP can be implemented on effective perception of OFDM signals, but the multipath effects will reduce the performance of the detection. The article obtains the optimum length of correlation window to operate correlation detection through the estimation of multipath channel, the method can improve the detection performance effectively that is verified by simulation.