The problem of inter symbol interference（ ISI） in wireless communication systems caused by multipath propagation when using high order modulation like M-Q AMis solved. Since the wireless receiver doesn＇t require a ...The problem of inter symbol interference（ ISI） in wireless communication systems caused by multipath propagation when using high order modulation like M-Q AMis solved. Since the wireless receiver doesn＇t require a training sequence,a blind equalization channel is implemented in the receiver to increase the throughput of the system. To improve the performances of both the blind equalizer and the system,a joint receiving mechanismincluding variable step size（ VSS） modified constant modulus algorithms（ MC-MA） and modified decision directed modulus algorithms（ MD DMA） is proposed to ameliorate the convergence speed and mean square error（ MSE） performance and combat the phase error when using high order QAM modulation. The VSS scheme is based on the selection of step size according to the distance between the output of the equalizer and the desired output in the constellation plane. Analysis and simulations showthat the performance of the proposed VSS-MCMA-MD DMA mechanismis better than that of algorithms with a fixed step size. In addition,the MCMA-MDDMA with VSS can performthe phase recovery by itself.展开更多
Inspired by ballpoint pen,an optical biosensor is developed for detection of Salmonella using a mechanical step rotator with a dropper to greatly simplify operation,a high gradient magnetic field with immune magnetic ...Inspired by ballpoint pen,an optical biosensor is developed for detection of Salmonella using a mechanical step rotator with a dropper to greatly simplify operation,a high gradient magnetic field with immune magnetic nanobeads to specifically separate bacteria,and immune gold@platinum nanozymes with a smartphone to sensitively detect bacteria.First,the preloaded bacterial sample is drawn by the dropper to react with the immune magnetic nanobeads through repeated squeezing and releasing of the dropper,and the rotator is successively rotated and the dropper is repeatedly squeezed and released to achieve mixing of the bacteria,magnetic nanobeads and gold@platinum nanozymes,followed by magnetic separation to remove the background.Then,the conjugates are effectively washed with skim milk and ultrapure water,and the substrate are rapidly catalyzed into the product.Finally,the blue product is photographed and analyzed using a smartphone to obtain the Salmonella concentration.This biosensor could detect Salmonella as low as 56 CFU/mL in~25 min.展开更多
基金Supported by the National Natural Science Foundation of China(6100201461101129+1 种基金6122700161072050)
文摘The problem of inter symbol interference（ ISI） in wireless communication systems caused by multipath propagation when using high order modulation like M-Q AMis solved. Since the wireless receiver doesn＇t require a training sequence,a blind equalization channel is implemented in the receiver to increase the throughput of the system. To improve the performances of both the blind equalizer and the system,a joint receiving mechanismincluding variable step size（ VSS） modified constant modulus algorithms（ MC-MA） and modified decision directed modulus algorithms（ MD DMA） is proposed to ameliorate the convergence speed and mean square error（ MSE） performance and combat the phase error when using high order QAM modulation. The VSS scheme is based on the selection of step size according to the distance between the output of the equalizer and the desired output in the constellation plane. Analysis and simulations showthat the performance of the proposed VSS-MCMA-MD DMA mechanismis better than that of algorithms with a fixed step size. In addition,the MCMA-MDDMA with VSS can performthe phase recovery by itself.
基金supported by Pinduoduo-China Agricultural University Research Fund(PC2023B02021).
文摘Inspired by ballpoint pen,an optical biosensor is developed for detection of Salmonella using a mechanical step rotator with a dropper to greatly simplify operation,a high gradient magnetic field with immune magnetic nanobeads to specifically separate bacteria,and immune gold@platinum nanozymes with a smartphone to sensitively detect bacteria.First,the preloaded bacterial sample is drawn by the dropper to react with the immune magnetic nanobeads through repeated squeezing and releasing of the dropper,and the rotator is successively rotated and the dropper is repeatedly squeezed and released to achieve mixing of the bacteria,magnetic nanobeads and gold@platinum nanozymes,followed by magnetic separation to remove the background.Then,the conjugates are effectively washed with skim milk and ultrapure water,and the substrate are rapidly catalyzed into the product.Finally,the blue product is photographed and analyzed using a smartphone to obtain the Salmonella concentration.This biosensor could detect Salmonella as low as 56 CFU/mL in~25 min.
