Efficient Signal Acquisition Scheme for Multi-band OFDM UWB systems

Packet detection always has been critical in the design of an OFDM receiver because failure of signal detections causes packet loss which degrades performance of receiver. In multi-band OFDM(MB-OFDM) system, first task of receiver is to perform signal detection which detects an incoming packet and acquires the TFC (time frequency code) of the packet. Auto-correlation based algorithms for signal detection are not suitable for MB-OFDM systems due to high hardware complexity. Cross-correlation requires less hardware but it is weak to frequency offset which severely degrades detection performance. A novel cross-correlation based scheme is proposed to reduce the synchronization failure probability by adopting verification mode. The proposed algorithm shows a very low synchronization failure probability around 10(-4) and it is very useful for MB-OFDM synchronization which requires robust synchronization.