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1. 发明授权

US12081377B2 Demodulating modulated signals 有权
公开(公告)号：US12081377B2
公开(公告)日：2024-09-03
申请号：US18010432
申请日：2021-06-16
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan
IPC分类号： H04L27/144
CPC分类号： H04L27/144
摘要： An apparatus for demodulating a frequency-modulated signal comprises a joint frequency-offset & modulation-index estimator, and a signal demodulator. The joint estimator receives data representative of a preamble portion of the signal, modulated with predetermined preamble data. It jointly determines a frequency-offset estimate and a modulation-index estimate by using an optimization process that minimizes a cost function that is a function of the received data and that is parameterised by a frequency-offset parameter and by a modulation-index parameter. The signal demodulator receives data representative of a message portion of the signal, modulated with message data, and uses the frequency-offset estimate to demodulate the message.

2. 发明授权

US11962443B2 Frequency offset estimation 有权
公开(公告)号：US11962443B2
公开(公告)日：2024-04-16
申请号：US18008388
申请日：2021-06-08
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan
IPC分类号： H04L27/22 , H04B1/00 , H04L27/233
CPC分类号： H04L27/2334
摘要： A receiver comprises a matched filter bank, decision logic and a frequency offset estimator. The matched filter bank comprises an input for receiving data representative of a frequency- or phase-modulated signal. The decision logic generates a sequence of demodulated symbol values from outputs of the matched filter bank. The frequency offset estimator determines a first phase value from a first output and a second phase value from a second output of the matched filter bank, the second output being offset from the first by L symbol periods. It also determines a phase adjustment value from an L-symbol subsequence within the sequence of demodulated symbol values, each subsequence value being determined from values output by the matched filter bank between the first and second outputs. It estimates a frequency offset based on the difference between the first phase value plus the phase adjustment value, and the second phase value.

3. 发明授权

US11533207B2 Matched filter bank 有权
公开(公告)号：US11533207B2
公开(公告)日：2022-12-20
申请号：US17050244
申请日：2019-04-24
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan , Wei Li
IPC分类号： H03H11/02 , H04L27/233 , H03H17/02 , H04L27/26
摘要： A radio receiver comprises a matched filter bank and a decision unit. The matched filter bank has a plurality of filter modules for generating correlation-strength data from a sampled radio signal, each filter module being configured to cross-correlate the sampled signal with data representing a respective filter sequence. The decision unit is configured to use the correlation-strength data to generate a sequence of decoded symbols from the sampled signal. The matched filter bank and/or decision unit are configured to determine the value of each symbol in the sequence in part based on the value of a respective earlier decoded symbol from the sequence of decoded symbols.

4. 发明授权

US11228471B2 Matched-filter radio receiver 有权
公开(公告)号：US11228471B2
公开(公告)日：2022-01-18
申请号：US16957946
申请日：2019-01-03
申请人： Nordic Semiconductor ASA
发明人： Wei Li , Daniel Ryan
IPC分类号： H04L27/00 , H04L27/233 , H04B1/12 , H04L27/148
摘要： A digital radio receiver has a matched filter bank of filter modules for receiving phase- or frequency-modulated radio signals. Each module cross-correlates a sampled signal with a respective multi-symbol filter sequence, using a plurality of samples in each symbol period. The matched filter bank calculates first values (zn(1)), for respective symbol periods, of a cross-correlation of the sampled signal with a first complex exponential function defined at sample points over one symbol period, and calculates second values (zn(−1)), for the respective symbol periods, of a cross-correlation of the sampled signal with a second, different, complex exponential function. A set of the filter modules cross-correlates the sampled signal with their respective filter sequences using an algorithm that takes, as input, the first values (zn(1)) for symbol periods at which the respective filter sequence has a first value, and the second values (zn(−1)) for symbol periods at which the filter sequence has a second, different, value.

5. 发明授权

US11089510B2 Generating radio data-channel access addresses from a base address seed 有权
公开(公告)号：US11089510B2
公开(公告)日：2021-08-10
申请号：US16635491
申请日：2018-07-27
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan
IPC分类号： H04W28/06 , H04W4/80 , H04L12/741
摘要： A radio communication apparatus receives or generates a base address seed, and generates data-channel access addresses from the seed. Each access address corresponds to a respective data-channel identifier, and is generated by setting a bit at a common first bit position to the value of a bit at a first common predetermined bit position in the base address seed or in the respective data-channel identifier; by setting a bit at a common second bit position to the bitwise complement of this value; and by setting one or more remaining bit positions in dependence on values at one or more bit positions in the base address seed and one or more bit positions in the respective data-channel identifier that are not the first common predetermined bit position. The apparatus can send or receive a radio data packet comprising an access address from the generated set.

6. 发明授权

US12047210B2 Demodulating frequency-modulated signals 有权
公开(公告)号：US12047210B2
公开(公告)日：2024-07-23
申请号：US18010413
申请日：2021-06-16
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan
IPC分类号： H04L27/156
CPC分类号： H04L27/156
摘要： A method of, and apparatus for, demodulating a frequency-modulated signal. The method comprises: for each of a plurality of templates, performing a respective cross-correlation operation between the template and data representative of the frequency-modulated signal, each template comprising data representative of a signal that is frequency-modulated with predetermined preamble data using a different respective modulation index; generating frequency-offset data from one or more of the cross-correlation operations, the frequency-offset data being representative of a difference between a reference frequency and a carrier frequency of the frequency-modulated signal; determining a respective peak correlation-coefficient value from each of the cross-correlation operations; identifying a highest peak correlation-coefficient value in the determined peak correlation-coefficient values; determining a modulation index estimate in dependence on which template produced the highest peak correlation-coefficient value; and using the frequency-offset data and the modulation index estimate to demodulate at least a portion of the frequency-modulated signal.

7. 发明授权

US11863362B2 Matched filter bank 有权
公开(公告)号：US11863362B2
公开(公告)日：2024-01-02
申请号：US17988602
申请日：2022-11-16
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan , Wei Li
IPC分类号： H03H11/02 , H04L27/233 , H03H17/02 , H04L27/26
CPC分类号： H04L27/2334 , H03H17/0254 , H04L27/2338 , H04L27/2671
摘要： A radio receiver comprises a matched filter bank and a decision unit. The matched filter bank has a plurality of filter modules for generating correlation-strength data from a sampled radio signal, each filter module being configured to cross-correlate the sampled signal with data representing a respective filter sequence. The decision unit is configured to use the correlation-strength data to generate a sequence of decoded symbols from the sampled signal. The matched filter bank and/or decision unit are configured to determine the value of each symbol in the sequence in part based on the value of a respective earlier decoded symbol from the sequence of decoded symbols.

8. 发明申请

US20230070483A1 SYNCHRONIZING RADIO COMMUNICATIONS 有权
公开(公告)号：US20230070483A1
公开(公告)日：2023-03-09
申请号：US17885399
申请日：2022-08-10
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan
IPC分类号： H04W64/00 , H04W56/00
摘要： A system for synchronizing communications in a radio ranging process involves transmitting calibration signals according to a predetermined schedule of nominal transmission times. Timing offsets are determined. A start time is determined for a transmission of a ranging signal. The start time is earlier than a nominal start time of the ranging signal by at least the largest timing offset. Another system for synchronization involves a radio device transmitting a calibration signal to a second radio device and receiving a calibration response signal from the second radio device. A time-of-flight value is determined in dependence on a time of departure of the calibration signal and a time of arrival of the calibration response signal. A ranging signal is transmitted at a time determined in dependence on the determined time-of-flight value. A ranging response signal is received and processed to determine a range value.

9. 发明申请

US20220171020A1 DETERMINING DISTANCE BETWEEN TWO RADIO TRANSCEIVERS 有权
公开(公告)号：US20220171020A1
公开(公告)日：2022-06-02
申请号：US17538826
申请日：2021-11-30
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan
IPC分类号： G01S7/285 , G01S13/82 , G01S5/02
摘要： A method for determining a distance between an initiator radio transceiver and a reflector radio transceiver is provided. The method comprises the initiator radio transceiver transmitting a first radio signal at a first transmission time and the reflector radio transceiver receiving the first radio signal at a first reception time. The reflector transceiver samples the first radio signal using a sampling clock signal having a sampling period and determines a first reception-time value at a temporal resolution that is finer than the sampling period, including a fractional component representative of a fraction of the sampling period. The reflector transceiver transmits a second radio signal at a second transmission time that is offset from the sampling clock signal by an amount that depends on said fractional component so as to provide a predetermined dwell time that is determined to an accuracy finer than the sampling period. The initiator radio transceiver receives the second radio signal at a second reception time and determines a distance value representative of a distance between the initiator radio transceiver and the reflector radio transceiver.

10. 发明授权

US11057303B2 Radio communication method and apparatus for generating data channel access addresses 有权
公开(公告)号：US11057303B2
公开(公告)日：2021-07-06
申请号：US16635489
申请日：2018-07-27
申请人： Nordic Semiconductor ASA
发明人： Daniel Ryan , Eivind Sjøgren Olsen
IPC分类号： H04L12/741 , H04W40/02 , H04W4/80 , H04W28/06
摘要： A radio communication apparatus receives or generates a base address seed, and generates data-channel access addresses from the seed. Each access address corresponds to a respective data-channel identifier, and is generated by setting a bit at a common first bit position to the value of a bit at a first common predetermined bit position in the base address seed or in the respective data-channel identifier; by setting a bit at a common second bit position to the bitwise complement of this value; and by setting one or more remaining bit positions in dependence on values at one or more bit positions in the base address seed and one or more bit positions in the respective data-channel identifier that are not the first common predetermined bit position. The apparatus can send or receive a radio data packet comprising an access address from the generated set.

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