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公开(公告)号：US09356646B2
公开(公告)日：2016-05-31
申请号：US14731226
申请日：2015-06-04
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
CPC classification number: H04N19/156 , H04B1/69 , H04B2001/6912 , H04L27/206 , H04L27/2628 , H04N19/15 , H04N19/176
Abstract: A radio frequency receiver for receiving an interleaved single carrier chirp spread spectrum signal based on a chirp sequence includes: a demodulator configured to receive, demodulate, and digitize a modulated radio frequency (RF) signal to form a digital baseband signal; and a signal decoder configured to: despread the digital baseband signal by at least: buffering signal data into blocks of L samples; multiplying the blocks of data with a conjugate of the chirp sequence to form a result; and performing a Fast Fourier Transform (FFT) on the result; equalize data from the FFT to form N data values, where N is the number of subchannels; transform the N data values into N demodulation symbols via an N-point inverse Fourier transform; and decode the demodulation symbols to form codec symbols.
Abstract translation: 一种用于基于啁啾序列接收交错单载波啁啾扩频信号的射频接收机，包括：解调器，被配置为接收，解调和数字化调制射频（RF）信号以形成数字基带信号; 以及信号解码器，其被配置为：至少将所述数字基带信号解扩展：将信号数据缓冲为L个采样块; 将数据块与啁啾序列的共轭相乘以形成结果; 并对结果执行快速傅里叶变换（FFT）; 对来自FFT的数据进行均衡以形成N个数据值，其中N是子信道数; 通过N点逆傅里叶变换将N个数据值变换成N个解调符号; 并解码解调符号以形成编解码器符号。
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公开(公告)号：US20140269843A1
公开(公告)日：2014-09-18
申请号：US13795973
申请日：2013-03-12
Applicant: DIGI INTERNATIONAL INC.
Inventor： Terry Michael Schaffner
IPC: H04B1/69
CPC classification number: H04N19/156 , H04B1/69 , H04B2001/6912 , H04L27/206 , H04L27/2628 , H04N19/15 , H04N19/176
Abstract: A radio frequency communication system. The system includes a radio frequency transmitter and a radio frequency receiver, wherein the radio frequency transmitter includes a modulation circuit and an RF modulator, wherein the radio frequency transmitter maps each block of K information bits into a block of N transmit symbols, transforms the block of N transmit symbols by using symbol block repetition and spreads the symbol blocks by multiplying the symbol blocks by a predefined chirp signal, and wherein the radio frequency receiver includes a chirp receiver operable to receive, demodulate and digitize a modulated radio frequency (RF) signal to form a digital baseband signal, and to recover a signal modulated using interleaved single carrier chirp spread spectrum modulation.
Abstract translation: 射频通信系统。 该系统包括射频发射机和射频接收机，其中射频发射机包括调制电路和RF调制器，其中射频发射机将K个信息比特的每个块映射成N个发射符号块，将该块 通过使用符号块重复发送符号，并通过将符号块乘以预定义的线性调频信号来扩展符号块，并且其中射频接收机包括线性调频接收器，可操作以接收，解调和数字化调制射频（RF）信号 以形成数字基带信号，并且恢复使用交织的单载波线性调频扩频调制调制的信号。
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公开(公告)号：US20160277747A1
公开(公告)日：2016-09-22
申请号：US15166826
申请日：2016-05-27
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
IPC: H04N19/156 , H04L27/20 , H04L27/26 , H04N19/15 , H04N19/176
CPC classification number: H04N19/156 , H04B1/69 , H04B2001/6912 , H04L27/206 , H04L27/2628 , H04N19/15 , H04N19/176
Abstract: A radio frequency receiver for receiving an interleaved single carrier chirp spread spectrum signal based on a chirp sequence includes: a demodulator configured to receive, demodulate, and digitize a modulated radio frequency (RF) signal to form a digital baseband signal; and a signal decoder configured to: despread the digital baseband signal by at least: buffering signal data into blocks of L samples; multiplying the blocks of data with a conjugate of the chirp sequence to form a result; and performing a Fast Fourier Transform (FFT) on the result; equalize data from the FFT to form N data values, where N is the number of subchannels; transform the N data values into N demodulation symbols via an N-point inverse Fourier transform; and decode the demodulation symbols to form codec symbols.
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公开(公告)号：US09766321B2
公开(公告)日：2017-09-19
申请号：US13830291
申请日：2013-03-14
Applicant: Digi International Inc.
Inventor： John Robert Schwartz , Terry Michael Schaffner
CPC classification number: G01S5/06 , G01S5/0215 , G01S5/0273 , G01S5/14 , G01S13/876 , G01S13/878
Abstract: A radio frequency locator system and method. First, second and third reference devices are operable to transmit a plurality of spread spectrum chirp signals frequency offset from one another. An object device is operable to receive the plurality of spread spectrum chirp signals, the object device is further operable to evaluate the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals and derive a fine propagation time between the reference devices and the object device using the phase shifts between the spread spectrum chirp signals. The reference devices determine their location independent of the object device and determine the location of the object device as a function of each of their locations and of their range to the object device.
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公开(公告)号：US09628807B2
公开(公告)日：2017-04-18
申请号：US15166826
申请日：2016-05-27
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
IPC: H04N19/156 , H04B1/69 , H04L27/20 , H04L27/26 , H04N19/15 , H04N19/176
CPC classification number: H04N19/156 , H04B1/69 , H04B2001/6912 , H04L27/206 , H04L27/2628 , H04N19/15 , H04N19/176
Abstract: A radio frequency receiver for receiving an interleaved single carrier chirp spread spectrum signal based on a chirp sequence includes: a demodulator configured to receive, demodulate, and digitize a modulated radio frequency (RF) signal to form a digital baseband signal; and a signal decoder configured to: despread the digital baseband signal by at least: buffering signal data into blocks of L samples; multiplying the blocks of data with a conjugate of the chirp sequence to form a result; and performing a Fast Fourier Transform (FFT) on the result; equalize data from the FFT to form N data values, where N is the number of subchannels; transform the N data values into N demodulation symbols via an N-point inverse Fourier transform; and decode the demodulation symbols to form codec symbols.
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Patent Agency Ranking
公开(公告)号：US20150304150A1
公开(公告)日：2015-10-22
申请号：US14254649
申请日：2014-04-16
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
IPC: H04L27/26
CPC classification number: H04L27/2665 , H04B1/1036 , H04B2001/1063 , H04L27/265
Abstract: In one embodiment a method for suppressing narrowband interference in an RF signal is provided. The method includes providing a block of baseband digital samples of the RF signal and computing n-1 stages of an n stage fast Fourier transform (FFT) on the block of the baseband digital samples to produce a first block of intermediate data points. A final threshold is computed based on values of the intermediate data points. A final stage of the n stage FFT is computed from the first block of intermediate data points to produce a block of output data points, and the output data points that have an energy above the final threshold are attenuated.
Abstract translation: 在一个实施例中，提供了一种用于抑制RF信号中的窄带干扰的方法。 该方法包括提供RF信号的基带数字采样块，并在基带数字采样块上计算n阶段快速傅立叶变换（FFT）的n-1级，以产生第一中间数据点块。 基于中间数据点的值来计算最终阈值。 从第一块中间数据点计算n级FFT的最后一级，以产生输出数据点的块，并且具有高于最终阈值的能量的输出数据点被衰减。
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公开(公告)号：US09083444B2
公开(公告)日：2015-07-14
申请号：US13795973
申请日：2013-03-12
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
IPC: H04B1/69
CPC classification number: H04N19/156 , H04B1/69 , H04B2001/6912 , H04L27/206 , H04L27/2628 , H04N19/15 , H04N19/176
Abstract: A radio frequency communication system. The system includes a radio frequency transmitter and a radio frequency receiver, wherein the radio frequency transmitter includes a modulation circuit and an RF modulator, wherein the radio frequency transmitter maps each block of K information bits into a block of N transmit symbols, transforms the block of N transmit symbols by using symbol block repetition and spreads the symbol blocks by multiplying the symbol blocks by a predefined chirp signal, and wherein the radio frequency receiver includes a chirp receiver operable to receive, demodulate and digitize a modulated radio frequency (RF) signal to form a digital baseband signal, and to recover a signal modulated using interleaved single carrier chirp spread spectrum modulation.
Abstract translation: 射频通信系统。 该系统包括射频发射机和射频接收机，其中射频发射机包括调制电路和RF调制器，其中射频发射机将K个信息比特的每个块映射成N个发射符号块，将该块 通过使用符号块重复发送符号，并通过将符号块乘以预定义的线性调频信号来扩展符号块，并且其中射频接收机包括线性调频接收器，可操作以接收，解调和数字化调制射频（RF）信号 以形成数字基带信号，并且恢复使用交织的单载波线性调频扩频调制调制的信号。
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公开(公告)号：US09276797B2
公开(公告)日：2016-03-01
申请号：US14254649
申请日：2014-04-16
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
IPC: H04L27/26
CPC classification number: H04L27/2665 , H04B1/1036 , H04B2001/1063 , H04L27/265
Abstract: In one embodiment a method for suppressing narrowband interference in an RF signal is provided. The method includes providing a block of baseband digital samples of the RF signal and computing n-1 stages of an n stage fast Fourier transform (FFT) on the block of the baseband digital samples to produce a first block of intermediate data points. A final threshold is computed based on values of the intermediate data points. A final stage of the n stage FFT is computed from the first block of intermediate data points to produce a block of output data points, and the output data points that have an energy above the final threshold are attenuated.
Abstract translation: 在一个实施例中，提供了一种用于抑制RF信号中的窄带干扰的方法。 该方法包括提供RF信号的基带数字采样块，并在基带数字采样块上计算n阶段快速傅立叶变换（FFT）的n-1级，以产生第一中间数据点块。 基于中间数据点的值来计算最终阈值。 从第一块中间数据点计算n级FFT的最后一级，以产生输出数据点的块，并且具有高于最终阈值的能量的输出数据点被衰减。
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公开(公告)号：US20160047886A1
公开(公告)日：2016-02-18
申请号：US14462181
申请日：2014-08-18
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
CPC classification number: G01S5/10 , G01S5/0284 , G01S5/06 , G01S13/74 , G01S13/878 , H04W4/023
Abstract: A system comprises a target node having an unknown location and at least three reference nodes within communication range of the target node. Each of the reference nodes has a known location. At least one of the reference nodes is configured to initiate a two-way time of flight transaction with one or more of the other reference nodes by transmitting a respective request to the one or more other reference nodes. Each of the reference nodes is configured to transmit a reply in response to a received request. The target node is configured to observe the request and reply of each two-way time of flight transaction and to determine a respective time differential between when the target node received each respective request and its corresponding reply of each observed two-way time of flight transaction.
Abstract translation: 系统包括具有未知位置的目标节点和目标节点的通信范围内的至少三个参考节点。 每个参考节点具有已知位置。 参考节点中的至少一个被配置为通过将相应的请求发送到一个或多个其他参考节点来发起与一个或多个其他参考节点的双向飞行事务时间。 每个参考节点被配置为响应于接收到的请求发送回复。 目标节点被配置为观察每个双向飞行时间交易的请求和应答，并且确定目标节点何时接收到每个相应请求的时间差与其每次观察到的双向飞行时间交易的相应回复 。
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公开(公告)号：US20150270866A1
公开(公告)日：2015-09-24
申请号：US14731226
申请日：2015-06-04
Applicant: Digi International Inc.
Inventor： Terry Michael Schaffner
CPC classification number: H04N19/156 , H04B1/69 , H04B2001/6912 , H04L27/206 , H04L27/2628 , H04N19/15 , H04N19/176
Abstract: A radio frequency receiver for receiving an interleaved single carrier chirp spread spectrum signal based on a chirp sequence includes: a demodulator configured to receive, demodulate, and digitize a modulated radio frequency (RF) signal to form a digital baseband signal; and a signal decoder configured to: despread the digital baseband signal by at least: buffering signal data into blocks of L samples; multiplying the blocks of data with a conjugate of the chirp sequence to form a result; and performing a Fast Fourier Transform (FFT) on the result; equalize data from the FFT to form N data values, where N is the number of subchannels; transform the N data values into N demodulation symbols via an N-point inverse Fourier transform; and decode the demodulation symbols to form codec symbols.
Abstract translation: 一种用于基于啁啾序列接收交错单载波啁啾扩频信号的射频接收机，包括：解调器，被配置为接收，解调和数字化调制射频（RF）信号以形成数字基带信号; 以及信号解码器，其被配置为：至少将所述数字基带信号解扩展：将信号数据缓冲为L个采样块; 将数据块与啁啾序列的共轭相乘以形成结果; 并对结果执行快速傅里叶变换（FFT）; 对来自FFT的数据进行均衡以形成N个数据值，其中N是子信道数; 通过N点逆傅里叶变换将N个数据值变换成N个解调符号; 并解码解调符号以形成编解码器符号。
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