回复： mmwave Transceiver system

[jeterlee]

How to use NI mmwave Transceiver System to measure channel response?

[Pikapi]

You can refer to AT&T and Wico's application.

For instance, Sounding Signal Duration and Repetition Time.

Maximum Delay spread
𝜏_𝑚𝑎𝑥=1.33 𝜇𝑠  400m propagation path
Vehicular Speed Example
Speed of 100 km/hr = 27.77 m/s
Maximum Doppler frequency 𝑣_𝑚𝑎𝑥=5.40 𝑘𝐻𝑧 for 60 𝐺𝐻𝑧
Coherence Time =78.3𝜇𝑠
Our repetition time =𝑇_𝑟𝑒𝑝=1.33 𝜇𝑠
@100 km/hr
Channel will get sampled about 58 times within the coherence time
@5 km/hr
Channel will be sampled about 1200 times within the coherence time

[jebaline_UB]

Has anyone ever had issues regarding the NI mmwave transceiver on the issue of a sinusoid noise being generated on the transmitter side and this is unnecessarily modulating the sent data. It seems to be a Local Oscillator Leakage issue, can anyone discuss more on it. I've attached images of how the received data looks and just the received noise alone. Data modulated by the noise. This noise is being produced by the tx