MIMO Eq Chan Freq Resp (NB-IoT)
shows the channel frequency response for all paths, whether detected or not. See the antenna detection threshold topic for more information.
See the non-MIMO Eq Chan Freq Resp trace topic for more info about channel frequency response.
This trace is always calculated from an OFDM symbol FFT taken from the center of the cyclic prefix. This is different from most Demod Trace Data and Layer Trace Data, which use the Symbol Timing Adjust parameter to determine the location of the symbol FFT. See the Symbol Timing Adjust topic for more information.
The trace is affected by the Normalize Chan. Freq. Resp. parameter. When Normalize Chan. Freq. Resp. is selected, the channel frequency response of each NRS/Rx path is normalized to have an average per-subcarrier gain of 0 dB. In addition, any frequency, phase, or time offset present in the channel frequency responses is removed. When the parameter is cleared, only the channel frequency response of the reference NRS/Rx path is normalized to have an average per-subcarrier gain of 0 dB. The relative power information among all the paths is maintained and any frequency, phase, or timing offset present is preserved.
The trace is not available in uplink when the signal contains only a single tone.
See Also
