To improve the bit error rate(BER) performance of multiple input multiple output(MIMO) systems with low complexity, a three-branch transmission scheme employing 8-weighted-type fractional Fourier transform(8-WFRFT) mo...To improve the bit error rate(BER) performance of multiple input multiple output(MIMO) systems with low complexity, a three-branch transmission scheme employing 8-weighted-type fractional Fourier transform(8-WFRFT) module is proposed. In the proposed scheme, the original signal is first decomposed into eight sub-signals and then merged into three component signals by the same carrier pattern. The three signals have mathematical constraint relations among themselves that can counteract the channel fading. They are simultaneously transmitted via three independent antennas after delay regulating. At the receiver, an inverse 8-WFRFT module is employed to obtain the estimated original signal by processing the received signal. Then, the bit error rate(BER) performance, transmitting power, transmission rate, power spectrum and computational complexity of the proposed scheme are analysed in detail. Numerical results show that the proposed scheme has a superior performance compared to STBC based three-antenna transmission scheme, in terms of BER performance.展开更多
Cloud detection and classification form a basis in weather analysis. Split window algorithm (SWA) is one of the simple and matured algorithms used to detect and classify water and ice clouds in the atmosphere using sa...Cloud detection and classification form a basis in weather analysis. Split window algorithm (SWA) is one of the simple and matured algorithms used to detect and classify water and ice clouds in the atmosphere using satellite data. The recent availability of Himawari-8 data has considerably strengthened the possibility of better cloud classification owing to its enhanced multi-band configuration as well as high temporal resolution. In SWA, cloud classification is attained by considering the spatial distributions of the brightness temperature (BT) and brightness temperature difference (BTD) of thermal infrared bands. In this study, we compare unsupervised classification results of SWA using the band pair of band 13 and 15 (SWA13-15, 10 and 12 μm bands), versus that of band 15 and 16 (SWA15-16, 12 and 13 μm bands) over the Japan area. Different threshold values of BT and BTD are chosen in winter and summer seasons to categorize cloud regions into nine different types. The accuracy of classification is verified by using the cloud-top height information derived from the data of Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO). For this purpose, six different paths of the space-borne lidar are selected in both summer and winter seasons, on the condition that the time span of overpass falls within the time ranges between 01:00 and 05:00 UTC, which corresponds to the local time around noon. The result of verification indicates that the classification based on SWA13-15 can detect more cloud types as compared with that based on SWA15-16 in both summer and winter seasons, though the latter combination is useful for delineating cumulonimbus underneath dense cirrus展开更多
Background: Oxidative stress has been closely linked to the incidence of diabetic complications. Therefore, the aim of this research article was to study hyperglycemia and abnormal lipid profile in diabetic patient ty...Background: Oxidative stress has been closely linked to the incidence of diabetic complications. Therefore, the aim of this research article was to study hyperglycemia and abnormal lipid profile in diabetic patient type 2 and its correlation with oxidative stress development as measured by 8-iso-PGF2α and 8-OHdG. Methods: Fifty (50) patients confirmed type 2 diabetes mellitus and eighty (80) non-diabetic control individuals were included in this study. All individuals were tested for blood glucose, lipid profile, 8-iso-PGF2α and 8-OHdG HdG. Results: The age of diabetic patients was observed to be ≥40 yrs in 96% and diabetes was frequently detected in female than in male patients (76% vs. 24%, p ere elevated in diabetic patients compared with control individuals (p < 0.0001) except in HDL-C, a significant decrease was recorded (p = 0.04). Serum 8-iso-PGF2α and 8-OHdG were elevated significantly in diabetic patients compared with non-diabetic control and a significant correlation was recorded between them (r = 0.6, p α was associated with Age (r = 0.394, p < 0.0001), FBG (0.553, p < 0.0001), LDL-C (r = 0.2, p = 0.023), TG (r = 0.176, p = 0.045) and TC (r = 0.2, p = 0.02). Also, 8-OHdG was associated with age (r = 0.558, p < 0.0001), FBG (r = 0.67, p < 0.0001), LDL-C (r = 0.28, p = 0.001), TG (r = 0.358, p < 0.0001) and TC (r = 0.33, p < 0.0001). Age, FBG, HbA1c, LDL-C, TG and TC showed a significant linear regression with 8-iso-PGF2α and 8-OHdG recording its role as significant predictors for the elevation of 8-iso-PGF2α and 8-OHdG. Therefore, hyperglycemia with oxidative stress development may play a role for dyslipidemia and diabetic complications. Conclusion: Diabetic patient’s type 2 has a higher rate of abnormal serum lipids and correlates significantly with lipid peroxidation and oxidized DNA bases as measured by 8-iso-PGF2α and 8-OHdG. Therefore, 8-iso-PGF2α and 8-OHdG could be used as oxidative biomarkers for evaluating diabetic patients with early prediction of its complications and cancer development.展开更多
基金supported by the National Basic Research Program of China (2013CB329003)the National Natural Science Foundation Program of China (No. 61671179)Funds for Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory (EX156410046)
文摘To improve the bit error rate(BER) performance of multiple input multiple output(MIMO) systems with low complexity, a three-branch transmission scheme employing 8-weighted-type fractional Fourier transform(8-WFRFT) module is proposed. In the proposed scheme, the original signal is first decomposed into eight sub-signals and then merged into three component signals by the same carrier pattern. The three signals have mathematical constraint relations among themselves that can counteract the channel fading. They are simultaneously transmitted via three independent antennas after delay regulating. At the receiver, an inverse 8-WFRFT module is employed to obtain the estimated original signal by processing the received signal. Then, the bit error rate(BER) performance, transmitting power, transmission rate, power spectrum and computational complexity of the proposed scheme are analysed in detail. Numerical results show that the proposed scheme has a superior performance compared to STBC based three-antenna transmission scheme, in terms of BER performance.
文摘Cloud detection and classification form a basis in weather analysis. Split window algorithm (SWA) is one of the simple and matured algorithms used to detect and classify water and ice clouds in the atmosphere using satellite data. The recent availability of Himawari-8 data has considerably strengthened the possibility of better cloud classification owing to its enhanced multi-band configuration as well as high temporal resolution. In SWA, cloud classification is attained by considering the spatial distributions of the brightness temperature (BT) and brightness temperature difference (BTD) of thermal infrared bands. In this study, we compare unsupervised classification results of SWA using the band pair of band 13 and 15 (SWA13-15, 10 and 12 μm bands), versus that of band 15 and 16 (SWA15-16, 12 and 13 μm bands) over the Japan area. Different threshold values of BT and BTD are chosen in winter and summer seasons to categorize cloud regions into nine different types. The accuracy of classification is verified by using the cloud-top height information derived from the data of Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO). For this purpose, six different paths of the space-borne lidar are selected in both summer and winter seasons, on the condition that the time span of overpass falls within the time ranges between 01:00 and 05:00 UTC, which corresponds to the local time around noon. The result of verification indicates that the classification based on SWA13-15 can detect more cloud types as compared with that based on SWA15-16 in both summer and winter seasons, though the latter combination is useful for delineating cumulonimbus underneath dense cirrus
文摘Background: Oxidative stress has been closely linked to the incidence of diabetic complications. Therefore, the aim of this research article was to study hyperglycemia and abnormal lipid profile in diabetic patient type 2 and its correlation with oxidative stress development as measured by 8-iso-PGF2α and 8-OHdG. Methods: Fifty (50) patients confirmed type 2 diabetes mellitus and eighty (80) non-diabetic control individuals were included in this study. All individuals were tested for blood glucose, lipid profile, 8-iso-PGF2α and 8-OHdG HdG. Results: The age of diabetic patients was observed to be ≥40 yrs in 96% and diabetes was frequently detected in female than in male patients (76% vs. 24%, p ere elevated in diabetic patients compared with control individuals (p < 0.0001) except in HDL-C, a significant decrease was recorded (p = 0.04). Serum 8-iso-PGF2α and 8-OHdG were elevated significantly in diabetic patients compared with non-diabetic control and a significant correlation was recorded between them (r = 0.6, p α was associated with Age (r = 0.394, p < 0.0001), FBG (0.553, p < 0.0001), LDL-C (r = 0.2, p = 0.023), TG (r = 0.176, p = 0.045) and TC (r = 0.2, p = 0.02). Also, 8-OHdG was associated with age (r = 0.558, p < 0.0001), FBG (r = 0.67, p < 0.0001), LDL-C (r = 0.28, p = 0.001), TG (r = 0.358, p < 0.0001) and TC (r = 0.33, p < 0.0001). Age, FBG, HbA1c, LDL-C, TG and TC showed a significant linear regression with 8-iso-PGF2α and 8-OHdG recording its role as significant predictors for the elevation of 8-iso-PGF2α and 8-OHdG. Therefore, hyperglycemia with oxidative stress development may play a role for dyslipidemia and diabetic complications. Conclusion: Diabetic patient’s type 2 has a higher rate of abnormal serum lipids and correlates significantly with lipid peroxidation and oxidized DNA bases as measured by 8-iso-PGF2α and 8-OHdG. Therefore, 8-iso-PGF2α and 8-OHdG could be used as oxidative biomarkers for evaluating diabetic patients with early prediction of its complications and cancer development.
