Research on Wideband Channel Measurement System Based on Software Defined Radio 1

Based on the analysis of the impact of wireless channel measurements to the railway dedicated mobile communication quality under the high-speed railway, this paper presents a narrow pulse wireless channel sounding approach based on the software-defined radio (SDR) technology with a measurement system developed. The measurement system could realize the dynamic analysis and display of measurement data in real time without an oscilloscope as auxiliary measure equipment. It overcomes the deficiency of rectangular pulse forming used in traditional analog narrow pulse sounder and improves the effective measurement bandwidth. Then both closed loop and open loop verifying measurement system are constructed to verify the measurement ability. And the results prove this channel measurement system is able to measure the behavior of radio wave propagation, and that is very useful for channel modeling of railway wideband mobile communication system

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