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    • 3. 发明申请
    • COMPRESSING AND DECOMPRESSING DATA ABOUT RADIO SIGNALS
    • 压缩和解密关于无线电信号的数据
    • WO2016180480A1
    • 2016-11-17
    • PCT/EP2015/060446
    • 2015-05-12
    • HERE GLOBAL B.V.
    • WIROLA, LauriIVANOV, PavelKHAN, Muhammad IrshanSYRJÄRINNE, JariTALVITIE, JukkaLOHAN, Elena-Simona
    • G01S5/02
    • G01S5/0278G01S5/0242G01S5/0247G01S5/0252G01S5/0284H04L69/04H04W28/06
    • 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.
    • 一种装置获得一组无线电数据,其包括具有每个信号强度相关值与地理位置(201)的表示的关联的由发射机发射的无线电信号的信号强度相关值。 该装置对获得的无线电数据集合应用频率变换以获得变换系数,每个变换系数包括变换索引和相关联的变换值(202)。 该装置选择具有比剩余的变换索引(203)更大的变换值的变换索引的子集,并且通过利用利用相应变换索引的索引值的出现概率(204)对每个变换索引进行编码来压缩变换索引。 相同或另一装置再次对压缩的变换索引进行解码以用于位置操作。