Measurements of UWB through-the-wall propagation using spectrum analyzer and the Hilbert transform

DOI

本文讲解了如何利用spectrum analyzer去测量UWB穿墙特性。本文的关键点在于利用Hilbert变换去retrieve phase information。这样就可以不使用昂贵的VNA设备去进行UWB穿墙特性的测量。

”Channel measurements for communication applications are usually performed in the frequency domain because of the availability of the required instrumentations, the moderate cost, and the large associated dynamic range.”
“For narrowband channel characterization, the phase data are less important because the phase can be approximated as a linear phase component. For UWB channels, however, the phase is a critical parameter and the nature of its variations with frequency over an ultra-wide bandwidth can significantly impact the time-domain response.”
- If the delay is not constant for different frequency components, the received signal will be distorted. - 群延时性
- 本文就利用Hibert transform获得phase information
Even for VNA, phase information is hard acquire.
- Bad environment, Long distance and wall obstructions
- Synchronization feedback cable should be very low loss at the upper frequency edge. - 明白了但仍未从逻辑上理解
- Phase measurements are quite sensitive, in-situ measurements’ error will skew result
- Transmitter receiver crosstalk will result in precursors in the impulse response