OFDM (Orthogonal Frequency Division Multiplexing) is a hot research in high-speed wireless communication field.OFDM modulation put the serial data flow into several parallel data flow, transmission on the orthogonal sub-carrier, has advantages as following: Resist multi-path fading, high spectrum efficiency, suitable for high speed data transmission and so on. It is wildly used on asymmetric digital subscriber loop, ETSI standards audio broadcast, digital video broadcast, High-definition digital TV, wireless LAN fields and so on. This paper introduces the OFDM theory, and implementation the OFDM transmission system based on the FPGA technology.
The spread of African swine fever virus (ASFV) caused huge economic costs, so early detection is particularly important. Here, we established a fluorescence biosensor based on carbon nanodots (CNDs) and loop-mediated isothermal amplification (LAMP) to ultra-sensitively detect ASFV. LAMP with high efficiency produced a large amount of pyro phosphoric acid and caused pH change in a short time. CNDs with strong light stability had a large fluorescence response at the emission wavelength of 585.5 nm to small pH change by the excitation wavelength of 550 nm. The biosensor realized “turn-off–on” mode for ASFV detection with the detection limit as low as 15.21 copies μL
−1
. In addition, the biosensor had high accuracy in the actual sample assay. Therefore, the biosensor achieved rapid, sensitive, low-cost, and simple detection for ASFV. Moreover, the biosensor broadened the detection pathway of LAMP as a tool with great development prospect.
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Supplementary Information
The online version contains supplementary material available at 10.1007/s00604-022-05390-7.
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