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An accurate synchronization method for 5G channel measurement is proposed. This method provides stable and accurate (< 1 ns error) synchronized trigger signal to the transmitter and the receiver. Because this method does not need a long cable to provide the synchronized trigger signal, the setup for channel measurement is easy. A verification of a channel in a simple environment is measured. By...
The increasing availability of low cost, commercial off-the-shelf unmanned aerial systems (UAS) technology has made it more accessible for researchers to investigate air-to-ground wireless communications channel phenomenology. Furthermore, using software defined radio (SDR) transceivers as the UAS communications platform provides the flexibility for researchers to characterize the air-to-ground channel...
At present, earth conductivity is a key factor which influences the calculation accuracy of the correction value of low-frequency ground-wave propagation time delay. Based on the practically metrical data and academic estimate method of time delay of low-frequency ground-wave propagation, this paper adopt the immune clonal computation method to inverse the earth equivalent conductivity of the propagation...
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