Abstract
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.
Highlights
High-speed wireless communication through wireless personal area network (WPAN) can bring great convenience to users
4.1 time-frequency code (TFC) identification In multi-band orthogonal frequency-division multiplexing (MB-OFDM) Ultra wideband (UWB) systems, the transmitted data are spread on the frequency bands of the same band group, and TFCs are used for frequency hopping
To achieve the given false alarm probability, the threshold for each signal-to-noise ratios (SNRs) is optimized by searching the suitable value
Summary
High-speed wireless communication through wireless personal area network (WPAN) can bring great convenience to users. The method in [16] is proposed based on the best linear unbiased estimation (BLUE) principle, which has a high performance These methods all focus on optimizing the implementation complexity or performance of individual functions, and none of them offer optimization on the power consumption of a comprehensive synchronization process. Based on autocorrelation (AC) algorithm, the design in [9] has low implementation complexity and can provide a comprehensive synchronization solution for the design of practical MB-OFDM UWB receiver. Because the number of samples used for CFO estimation and timing offset estimation is small, the normal method with low implementation complexity is low-power design. The key for implementing the synchronizer with low power is designing the TFC identification block and the packet detection block with low power consumption
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