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An OFDM system with dual windowing is proposed as the physical layer for cognitive radios. This system can create deep spectrum notches to avoid interference to primary user, while maintaining high performance and low complexity.
One of the problems in normalized difference vegetation index (NDVI) based agricultural applications is the time lag between precipitation and NDVI. In this study, the CERES-Wheat model under decision support system for agrotechnology transfer shell was used to simulate the time lag between precipitation and NDVI under minted conditions in the Guanzhong Plain, China. The results showed that there...
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