Abstract: 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.

Abstract: It is disclosed to obtain a frequency transformed radiomap data set by applying a discrete frequency transform to an original radiomap data set. It is also disclosed to obtain a reconstructed radiomap data set by applying an inverse discrete frequency transform to a frequency transformed radiomap data set.

Abstract: 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.

Abstract: 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.

Abstract: It is disclosed to obtain a frequency transformed radiomap data set by applying a discrete frequency transform to an original radiomap data set. It is also disclosed to obtain a reconstructed radiomap data set by applying an inverse discrete frequency transform to a frequency transformed radiomap data set.

Abstract: It is disclosed to obtain a frequency transformed radiomap data set by applying a discrete frequency transform to an original radiomap data set. It is also disclosed to obtain a reconstructed radiomap data set by applying an inverse discrete frequency transform to a frequency transformed radiomap data set.

Abstract: 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.

Abstract: It is disclosed to obtain a frequency transformed radiomap data set by applying a discrete frequency transform to an original radiomap data set. It is also disclosed to obtain a reconstructed radiomap data set by applying an inverse discrete frequency transform to a frequency transformed radiomap data set.

Abstract: 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 (201). 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 (202). The apparatus selects a subset of transform indices having more significant transform values than the remaining transform indices (203) and compresses the transform indices by encoding each transform index exploiting a probability of occurrence of an index value of a respective transform index (204). The same or another apparatus decodes the compressed transform indices again for use in position operations.

Abstract: A method performed by at least one apparatus is inter alia disclosed, said method comprising: obtaining measurement data on a location-specific quantity of a signal transmitted by a transmitter; obtaining location information associated with said measurement data on said location-specific quantity; and determining, based on said obtained measurement data and said obtained location information, one or more model parameters of a model describing said location-specific quantity in dependence of location, wherein said model assumes a location dependence of said location-specific quantity in form of a combination of a first location-specific function and a second location-specific function.

Abstract: It is disclosed to obtain a frequency transformed radiomap data set by applying a discrete frequency transform to an original radiomap data set. It is also disclosed to obtain a reconstructed radiomap data set by applying an inverse discrete frequency transform to a frequency transformed radiomap data set.

Abstract: A method performed by an apparatus is disclosed. The method comprises obtaining position information on a position and received signal strength information representative of a strength of a signal from a communication node receivable at the position. The method further comprises generating or updating a 3D sectorized path-loss model associated with the communication node at least based on the position information and the received signal strength information, wherein the position information and the received signal strength information are used to generate or update one or more path-loss parameters for a 3D sector of a set of one or more 3D sectors of the 3D sectorized path-loss model in which 3D sector the position is located.

Abstract: A method performed by at least one apparatus is inter alia disclosed, said method comprising: obtaining measurement data on a location-specific quantity of a signal transmitted by a transmitter; obtaining location information associated with said measurement data on said location-specific quantity; and determining, based on said obtained measurement data and said obtained location information, one or more model parameters of a model describing said location-specific quantity in dependence of location, wherein said model assumes a location dependence of said location-specific quantity in form of a combination of a first location-specific function and a second location-specific function.

Abstract: 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 (201). 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 (202). The apparatus selects a subset of transform indices having more significant transform values than the remaining transform indices (203) and compresses the transform indices by encoding each transform index exploiting a probability of occurrence of an index value of a respective transform index (204). The same or another apparatus decodes the compressed transform indices again for use in position operations.

Abstract: A method performed by an apparatus is disclosed. The method comprises obtaining position information on a position and received signal strength information representative of a strength of a signal from a communication node receivable at the position. The method further comprises generating or updating a 3D sectorized path-loss model associated with the communication node at least based on the position information and the received signal strength information, wherein the position information and the received signal strength information are used to generate or update one or more path-loss parameters for a 3D sector of a set of one or more 3D sectors of the 3D sectorized path-loss model in which 3D sector the position is located.

Abstract: A method performed by an apparatus is disclosed. The method comprises obtaining position information on a position and received signal strength information representative of a strength of a signal from a communication node receivable at the position. The method further comprises generating or updating a 3D sectorized path-loss model associated with the communication node at least based on the position information and the received signal strength information, wherein the position information and the received signal strength information are used to generate or update one or more path-loss parameters for a 3D sector of a set of one or more 3D sectors of the 3D sectorized path-loss model in which 3D sector the position is located.

Abstract: A method performed by an apparatus is disclosed. The method comprises obtaining position information on a position and received signal strength information representative of a strength of a signal from a communication node receivable at the position. The method further comprises generating or updating a 3D sectorized path-loss model associated with the communication node at least based on the position information and the received signal strength information, wherein the position information and the received signal strength information are used to generate or update one or more path-loss parameters for a 3D sector of a set of one or more 3D sectors of the 3D sectorized path-loss model in which 3D sector the position is located.

Abstract: It is disclosed to obtain a frequency transformed radiomap data set by applying a discrete frequency transform to an original radiomap data set. It is also disclosed to obtain a reconstructed radiomap data set by applying an inverse discrete frequency transform to a frequency transform to original RMDS transformed radiomap data set.

Abstract: A discriminator for a code tracking block of a navigation satellite system (NSS) receiver is provided. This discriminator can advantageously use only four complex correlators, i.e. early (E), prompt (P), late (L), and one of very early (VE) and very late (VL), while providing optimized multipath mitigation. This NSS discriminator can be derived from the first-order derivative of a Teager-Kaiser (TK) operator. This differential TK (DiffTK) discriminator is more sensitive to multipath dispersions than other discriminators or correlators, thereby providing enhanced performance in the presence of multipath.