IQ Freq Ref (LTE)
shows the reference (demodulated) IQ values of the subcarriers for each OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. symbol point at the output of the FFT Fast Fourier Transform: A mathematical operation performed on a time-domain signal to yield the individual spectral components that constitute the signal. See Spectrum.. This trace always shows OFDM reference IQ points (unlike IQ Ref, which in uplink mode, shows reference PUSCH Physical Uplink Shared Channel SC-FDMA Single Carrier - Frequency Division Multiple Access IQ points after despreading (IFFT Inverse Fast Fourier Transform)).
This trace is only available for uplink signals.
To view SC-FDMA Frequency Division Multiple Access: Method of allowing multiple users to share the radio frequency spectrum by assigning each active user an individual frequency channel. In this practice, users are dynamically allocated a group of frequencies so that the apparent availability is greater than the number of channels. (uplink PUSCH) signals in the time domain (after despreading), use the IQ Ref trace.
The information for the IQ Freq Meas trace applies to this trace as well, except that this trace contains the reference IQ data.
See Also
