Patent ID: 11906648
Assignee: HERE GLOBAL B.V.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A method comprising:
for each of a plurality of radio image matrices, applying a frequency transform to obtain transform coefficients from a set of radio data comprising the plurality of radio image matrices corresponding to different transmitters, each transform coefficient comprising a transform index and an associated transform value;
for each of the plurality of radio image matrices and based upon energy of frequency transformed radio data as represented by the transform coefficients, selecting a subset of transform indices; and
for each of the plurality of radio image matrices, compressing the subset of transform indices by encoding the transform indices exploiting a probability of occurrence of an index value of a respective transform index,
wherein selecting at least the minimum number of transform indices comprises excluding the transform coefficient corresponding to a direct current (DC) component.