High Frequency Over The Horizon Radar (HF OTH) which works in high frequency band, is able to break through the earth curvature restrictions on the horizon to detect targets outside the sight. HF OTH radar also has other good characteristics, for instance, it has large coverage area, and can work without the limitation of weather.
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Detecting unknown signals is an important part of the communication countermeasure. How to get the characters of the unknown signals in a finite time is becoming a hot topic. The transmission signal is usually with high frequency, which is at the range of 3MHz to 3000MHz. Furthermore, people transmit the useful signals with low Signal-to-Noise
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As a key technology of the fourth-generation mobile communication, the OFDM technology received a widespread attention and study. Modulation signal recognition is an important branch in researches of the modern mobile communication. It requires us to detect the useful signal and estimate various modulation parameters in the complex wireless environment to provide the conditions for
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In the past decade, the processing of signal has been one of the fastest developing subjects. The traditional signal processing is based on three suppose: linearity, Gaussianity and stationarity. While the modern signal processing non-linearity, non-Gaussianity and non-stationarity. Especially, the signal with the non-Gaussian noise has caught most people’s eyes.This paper gives some perfection and
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By sharing antennas of neighboring nodes in a cooperative manner to construct a virtual environment, cooperative communication systems can combat the signal fading caused by wireless channels effectively. The single-antenna based cooperative system acquires spatial diversity gain and multiplexing gain, as well as the transmission efficiency and reliability. The traditional Space-Time Coding based cooperative communication
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Multiple Input Multiple Output (MIMO) is the key technology for the next generation of wireless communications.It makes full use of spatial multiplexing and transmit diversity techniques to improve the system capacity and performance without increasing power and band width. In MIMO technique, signal detection is a key issue, and is also the focus of this
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Multiple-input multiple-output (MIMO) system can effectively improve the system capacity without any increase in channel bandwidth; it is the key technology of the next generation of wireless communication system. Pre-coding is one of the signal processing methods which requires channel state information at transmitter to cancel the interference between different channels. Pre-coding has become one
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As the rapid development of the technology of wireless communication, the resource of wireless spectrum becomes more and more deficient. But the improvement in the technology of cognitive radio has more and more made it the solution to this deficiency of spectrum resource, and it could improve the utilization ratio of spectrum and realize the
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LTE is the evolution of3.9G to4G mobile communications which is proposed by the3GPP, through the use of OFDMA, MIMO and other advanced technology its data transmission rate have been greatly improved, which is higher than3G mobile systems.The theoretical rate of downlink is up to100Mbit/s and uplink theoretical rate is up to50Mbit/s, at the same time
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Adverse Drug Reaction (ADR) reports and monitoring are of great significance to ensure drug safety, keep public healthy. ADR Work Centre is the main agency to guarantee ADR monitoring. At present, the building of the provincial Adverse Reaction Monitoring management system also remains the C / S structure, which leads to can not be achieved
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