Here Global B.v.

Jukka Talvitie

Pavel Ivanov

Lauri Wirola

Muhammad Irshan Khan

Elena-Simona Lohan

Jari Syrjärinne

An apparatus obtains a set of radio data comprising signal strength related values for radio signals transmitted by a transmitter with an association of each signal strength related value with a representation of a geographical location. The apparatus applies a frequency transform to the obtained set of radio data to obtain transform coefficients, each transform coefficient comprising a transform index and an associated transform value. The apparatus selects a subset of transform indices having more significant transform values than the remaining transform indices and compresses the transform indices by encoding each transform index exploiting a probability of occurrence of an index value of a respective transform index. The same or another apparatus decodes the compressed transform indices again for use in position operations.

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Tampere, Finland

Jukka Talvitie