Custom signal data generation in a radio system

A method, comprising:

• selecting, by a system comprising a processor, a first signal from,
• a memory that is configured to store and retrieve a second signal,
• a generator that is configured to generate first in-phase, quadrature sub-carrier values,
• a look up table that stores predetermined second in-phase, quadrature sub-carrier values, and
• a pseudo-random look up table generator that is configured to operate on the predetermined second in-phase, quadrature sub-carrier values to produce pseudo-random data values;
• and
• injecting, by the system, the first signal into a radio unit used by the system, wherein the second signal is configurably switched between a time domain path of a digital front end of the system, and a frequency domain path of the digital front end.

An apparatus, comprising:

• a radio unit;
• a signal generation component configured to generate a first signal, wherein the first signal is separate from a second signal that comprises live-air data;
• and
• an injection component that is configured to inject the first signal into the radio unit, wherein the first signal is configurably switched between a time domain path of a digital front end of the apparatus, and a frequency domain path of the digital front end.