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Due to the complexity of multi-band orthogonal frequency-division multiplexing (MB-OFDM), achieving low power is still one of the major difficulties in designing the MB-OFDM-based ultra wideband (UWB) receiver. This paper targets at providing a very low power synchronization scheme with high performance for the MB-OFDM UWB receiver. First, the power consumptions of the individual functions are analyzed based on the overall architecture of the scheme. Then, the individual functions are designed. A time-frequency code (TFC) identification scheme is proposed, which divided the TFC identification process into two steps. A signal detector (SD) is designed for the first step to judge whether preamble symbols are present, and a TFC type detector (TTD) is designed for the second step to identify the TFC type. A packet detector is proposed, in which a coarse detector (CD) and a final detector (FD) are designed for reducing power consumption and improving performance, respectively. Also, a matched filter is proposed to simplify the correlation operation between the received symbol and the preamble symbol. The evaluation results show that the proposed TFC identification scheme and the packet detector have obvious lower computational complexity compared to existing solutions. The results also show the TFC identification scheme has satisfactory performance and that the performance of the packet detector is excellent.

A power-efficient synchronization scheme for the MB-OFDM-based UWB systems