Wireless channel parameter measurement device and method thereof

Abstract

The invention relates to a wireless channel parameter measurement device and a method thereof in the technical field of wireless communication. The device comprises a signal transmission module and a signal receiving and processing module. The method comprises the following steps that: two paths of pseudo-random sequences are generated, and are subjected to 4QAM modulation; a modulated baseband digital signal is subjected to molding and filtering; the baseband digital signal is converted into an analog signal to be transmitted through a transmission antenna; a received radio frequency signal is subjected to radio frequency processing and analog-to-digital conversion to be changed into a digital signal; and the digital signal is subjected to I path demodulation and Q path demodulation, and is subjected to low-pass filtering to be converted into a baseband digital signal; the baseband digital signal is related to the local pseudo-random sequence, and outputs related signals and a result of the quadratic sum of related signals to acquire a required channel parameter through calculating. The device and the method can provide more accurate and overall testing results, and lead the whole collecting process to be more complete and convenient as a data acquisition and processing unit is added.

Description

technical field [0001] The invention relates to a measuring device and a method thereof in the technical field of wireless communication, in particular to a wireless channel parameter measuring device and a method thereof. Background technique [0002] The characteristics of wireless channels can be characterized by two aspects: large-scale path loss and small-scale fading. The main feature of large-scale path loss is the level attenuation of the signal when it propagates in space. It can be obtained by measuring the level of the channel with a spectrum analyzer and other instruments at different positions, and then performing statistical analysis. Through this measurement method, many Classic wireless channel models, such as Okumura model, Okumura-Hata model and so on. The small-scale fading of wireless channels is mainly caused by multipath. Specifically, it can be expressed in three main aspects: multipath strength, multipath time delay, and Doppler frequency shift on d...

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Problems solved by technology

However, although this kind of system can obtain the phase information of the signal at the same time on the basis of measuring the multipath strength and time delay, but because it sends a single-channel pseudo-random sequence, the phase information can only be the phase information of the analog signal. Inconvenient for subsequent storage and processing

[0005] To sum up, the existing channel measurement methods have obvious deficiencies when measuring the Doppler frequency offset parameters of channel small-scale fading. At the same time, the digital storage oscilloscope is used as the final output, which is not convenient for subsequent processing.

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