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    DIGITAL RADIO TRANSMISSIONS
    1.
    发明公开
    DIGITAL RADIO TRANSMISSIONS 有权
    CPFSK-EMPFÄNGERMIT EINEM MATCHED-FILTER-BANK UNDSCHÄTZUNGDES FREQUENZOFFSETS

    公开(公告)号：EP2984802A2

    公开(公告)日：2016-02-17

    申请号：EP14716401.6

    申请日：2014-04-09

    申请人： Nordic Semiconductor ASA

    发明人： WICHLUND, Sverre ,  OLSEN, Eivind Sjøgren

    IPC分类号： H04L27/233 ,  H04L27/00

    CPC分类号： H04L27/2334 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0065 ,  H04L2027/0085 ,  H04L2027/0095

    摘要： A digital radio receiver adapted to receive radio signals modulated using continuous phase frequency shift keying, CPFSK. The receiver comprises means for receiving a radio signal (2), a correlator (8) arranged to estimate a frequency offset between the carrier frequency of the received radio signal and a nominal carrier frequency, means for correcting said frequency offset (4) and outputting a frequency-corrected radio signal (6), and a matched filter bank, MFB, which comprises a plurality of filters (20,22), each of which corresponds to a different bit pattern, for determining a bit sequence (36) from the frequency-corrected radio signal (6).

    摘要翻译： 一种适于接收使用连续相位频移键控（CPFSK）调制的无线电信号的数字无线电接收机。 接收机包括用于接收无线电信号（2）的装置，被布置为估计所接收的无线电信号的载波频率与标称载波频率之间的频率偏移的相关器（8），用于校正所述频率偏移（4）并输出 频率校正无线电信号（6）和匹配滤波器组MFB，其包括多个滤波器（20,22），每个滤波器组对应于不同的位模式，用于确定来自 频率校正无线电信号（6）。

    METHOD AND APPARATUS OF PROCESSING A DIGITALLY ENCODED RADIO SIGNAL
    3.
    发明公开
    METHOD AND APPARATUS OF PROCESSING A DIGITALLY ENCODED RADIO SIGNAL 审中-公开

    公开(公告)号：EP3387807A1

    公开(公告)日：2018-10-17

    申请号：EP16788786.8

    申请日：2016-10-31

    申请人： Nordic Semiconductor ASA

    发明人： WEI, Li ,  OLSEN, Eivind Sjøgren

    IPC分类号： H04L25/03

    CPC分类号： H04L1/0054 ,  H03M13/4138 ,  H04L25/03318

    摘要： A method of processing a digitally encoded radio signal (102) comprising a bit to be determined is disclosed. The method comprises correlating a first bit sequence (103) comprising the bit with a plurality of predetermined filters (104a-h) to create a first set of filter coefficients (110a-h); calculating (120) a first likelihood data set (124) comprising a likelihood of said bit having a given value for each bit position from the first set of filter coefficients. A second bit sequence (103) comprising the bit at a different position is then correlated with the filters to create a second set of filter coefficients (10a-h), from which a second likelihood data set (124) is calculated. A soft output bit (26) comprising a probability weighted bit value from data corresponding to the bit at a first and second bit positions from the first and second likelihood data sets respectively is then calculated.

    RADIO SYNCHRONIZATION
    4.
    发明公开
    RADIO SYNCHRONIZATION 审中-公开

    公开(公告)号：EP4125224A1

    公开(公告)日：2023-02-01

    申请号：EP22184664.5

    申请日：2022-07-13

    申请人： Nordic Semiconductor ASA

    发明人： LI, Wei ,  OLSEN, Eivind Sjøgren

    IPC分类号： H04B1/707 ,  H04L7/04

    摘要： A radio receiver device is configured to determine whether a received digital radio signal includes a predetermined cyclic preamble having a period. An input portion is configured to sample the received digital radio signal and to generate a plurality of samples, which are stored in a buffer. A first autocorrelator (202) is configured to correlate first and second subsets of the plurality of samples to generate a first correlation metric, the second subset having been stored in the buffer earlier than said first subset by an even integer multiple of half of the preamble period. A second autocorrelator (204) is configured to correlate first and third subsets of the plurality of samples to generate a second correlation metric, the third subset having been stored in the buffer earlier than said first subset by an odd integer multiple of half of the preamble period. A processing portion is configured to calculate a difference between the correlation metrics and determine that the radio signal includes the predetermined cyclic preamble when the difference is greater than a threshold value.