1. A method, performed by a radio network device, of synchronizing to a wireless communication network, comprising:receiving a wideband signal and storing the received wideband signal;
transforming the received wideband signal to the frequency domain to generate a frequency domain signal;
selecting part of, but less than all of, the frequency domain signal;
converting the selected part of the frequency domain signal to the time domain to generate a time domain signal;
filtering the time domain signal with a sync reference; and
applying a criterion to detect a sync signal in the time domain signal.