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81. 发明申请

US20100215126A1 CARRIER RECOVERY APPARATUS AND METHOD THEREOF 有权
标题翻译：载波恢复装置及其方法
公开(公告)号：US20100215126A1
公开(公告)日：2010-08-26
申请号：US12393023
申请日：2009-02-25
申请人： Guo-Hau Gau , Pei-Jun Shih , Shin-Shiuan Cheng
发明人： Guo-Hau Gau , Pei-Jun Shih , Shin-Shiuan Cheng
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H04L2027/0024 , H04L2027/0055 , H04L2027/0067 , H04L2027/0073 , H04L2027/0079 , H04L2027/0085 , H04L2027/0087
摘要： A carrier recovery apparatus includes a pilot strength detector, a first lock loop, a second lock loop, and a controller. The pilot strength detector determines whether a pilot strength of an input signal is greater than a threshold value to generate a control signal. The first lock loop performs a first carrier recovery on the input signal. The second lock loop performs a second carrier recovery on the input signal. The controller selectively allows the first lock loop to perform the first carrier recovery on the input signal or the second lock loop to perform the second carrier recovery on the input signal according to the control signal. The first lock loop is a pilot-based FPLL and the second locked loop is a pilot-less PLL.
摘要翻译：载波恢复装置包括导频强度检测器，第一锁定环路，第二锁定环路和控制器。导频强度检测器确定输入信号的导频强度是否大于阈值以产生控制信号。第一个锁定环路对输入信号执行第一个载波恢复。第二锁定环对输入信号执行第二载波恢复。控制器选择性地允许第一锁定环路在输入信号或第二锁定环路上执行第一载波恢复，以根据控制信号在输入信号上执行第二载波恢复。第一个锁定环路是一个基于导频的FPLL，第二个锁定环路是一个无引导的PLL。

82. 发明申请

US20100027594A1 METHOD AND SYSTEM FOR APPLYING VITERBI TYPE PSK DEMODULATION FOR OPTIMUM CORRELATION OF GPS SIGNALS 有权
标题翻译：用于应用VITERBI型PSK解调的GPS信号的最佳相关方法和系统
公开(公告)号：US20100027594A1
公开(公告)日：2010-02-04
申请号：US12553285
申请日：2009-09-03
申请人： Jorgen S. Nielsen
发明人： Jorgen S. Nielsen
IPC分类号： H04B1/707 , H04L27/06
CPC分类号： H04B1/71057 , H04L25/03178 , H04L27/2332 , H04L2027/003 , H04L2027/0042 , H04L2027/0046 , H04L2027/0067 , H04L2027/0085
摘要： A method and system of improving sensitivity in the demodulation of a received signal over an arbitrary measurement time epoch, the method comprising the steps of: correlating the received signal in a coherent fashion; and utilizing a Viterbi phase state keying trellis demodulation with a variable resolution of phase states over 360.degree. to demodulate the radio frequency phase trajectory of the signal throughout the measurement time epoch; and the system comprising a receiver for receiving a direct sequence spread spectrum signal, the receiver comprising: an antenna for receiving the direct sequence spread spectrum signal; a downconverter for downconverting the received signal, producing a downconverted signal; an analog to digital converter (60) to convert the downconverted signal to a digital signal; a despreader (80) for despreading and coherently correlating the digital signal to a known signal, creating a despread signal; and a processor for applying a Viterbi algorithm to the despread signal.
摘要翻译：一种在任意测量时间周期上提高对接收信号的解调灵敏度的方法和系统，该方法包括以下步骤：以一致的方式对接收到的信号进行相关; 并利用具有360度以上相位状态的可变分辨率的维特比相位状态键控网格解调。在整个测量时间段解调信号的射频相位轨迹; 并且所述系统包括用于接收直接序列扩频信号的接收机，所述接收机包括：用于接收所述直接序列扩频信号的天线; 下变频器，用于下变频接收信号，产生下变频信号; 模数转换器（60），用于将下变频信号转换成数字信号; 解扩器（80），用于将数字信号与已知信号进行解扩和相干相关，产生解扩信号; 以及用于将Viterbi算法应用于解扩展信号的处理器。

83. 发明授权

US07570717B2 Apparatus and method for pilot-less carrier acquisition of vestigial sideband (VSB) signal 有权
标题翻译：用于无载波采集残留边带（VSB）信号的装置和方法
公开(公告)号：US07570717B2
公开(公告)日：2009-08-04
申请号：US11035744
申请日：2005-01-18
申请人： Min-ho Kim , Beom-kon Kim , Dong-seog Han , Hae-sock Oh , Junling Zhang , Ki-dong Kang
发明人： Min-ho Kim , Beom-kon Kim , Dong-seog Han , Hae-sock Oh , Junling Zhang , Ki-dong Kang
IPC分类号： H04L27/00
CPC分类号： H04L27/066 , H04L2027/003 , H04L2027/0055 , H04L2027/0063 , H04L2027/0085
摘要： A method for demodulating a carrier wave in a channel environment in which a pilot signal may be distorted, in a digital TV receiver, which may receive a vestigial sideband (VSB) modulated and transmitted signal, and a demodulation apparatus therefor are provided. A field synchronization part of a VSB signal, in which a pilot signal may be removed, may be used as a reference signal for synchronization. The frequency offset of a carrier wave may be estimated through self-correlation of a signal, and the phase offset of the carrier wave may be estimated through a pilot-less frequency and phase locked loop (FPLL).
摘要翻译：提供一种用于在可以接收残留边带（VSB）调制和发送信号的数字TV接收机中导频信号可能失真的信道环境中的载波解调方法及其解调装置。可以使用其中可以去除导频信号的VSB信号的场同步部分作为用于同步的参考信号。可以通过信号的自相关来估计载波的频率偏移，并且可以通过无引导频率和锁相环（FPLL）来估计载波的相位偏移。

84. 发明授权

US07477707B2 Computationally efficient demodulation for differential phase shift keying 失效
标题翻译：差分相移键控的计算有效解调
公开(公告)号：US07477707B2
公开(公告)日：2009-01-13
申请号：US10615880
申请日：2003-07-10
申请人： Sabera Kazi , Robert C. Becker
发明人： Sabera Kazi , Robert C. Becker
IPC分类号： H03H7/30 , H03H7/40 , H03K5/159
CPC分类号： H04L27/2332 , H04L7/042 , H04L2027/003 , H04L2027/0085
摘要： A DPSK demodulator demodulates DPSK signals in a computationally efficient manner to reduce the power requirements of the DPSK demodulator. A DPSK signal is received, digitized, converted to its in-phase (I) and quadrature (Q) components and filtered to remove noise. The I and Q components are processed to determine a relative phase and frequency offset. The phase is adjusted using the frequency offset. The adjusted phase is converted to an absolute phase, which is then mapped to a symbol representative of one or more bits of data.
摘要翻译： DPSK解调器以计算有效的方式解调DPSK信号，以降低DPSK解调器的功率需求。 DPSK信号被接收，数字化，转换成其同相（I）和正交（Q）分量并进行滤波以去除噪声。处理I和Q分量以确定相对相位和频率偏移。使用频率偏移调整相位。调整后的相位被转换为绝对相位，然后映射到表示一个或多个数据位的符号。

85. 发明申请

US20070268978A1 Carrier offset estimator 审中-公开
标题翻译：载波偏移估计器
公开(公告)号：US20070268978A1
公开(公告)日：2007-11-22
申请号：US11888168
申请日：2007-07-31
申请人： Leonid Kazakevich , Fatih Ozluturk , Alexander Reznik
发明人： Leonid Kazakevich , Fatih Ozluturk , Alexander Reznik
IPC分类号： H04L5/12
CPC分类号： H04L27/3836 , H04L27/2332 , H04L27/3854 , H04L2027/0065 , H04L2027/0085
摘要： A system for estimating carrier offset includes includes a transmitter configured to transmit a quadrature modulated signal, and a receiver. The receiver includes an input configured to receive the quadrature modulated signal, a local oscillator configured to generate cosine and sine waves at a carrier frequency of the quadrature modulated signal, at least one cosine mixer configured to generate a carrier frequency demodulated output, at least one sine mixer configured to generate a carrier frequency demodulated output, a plurality of lowpass filters configured to filter the demodulated output of the cosine and sine mixers to produce filtered cosine and sine signal components, and a carrier offset detection processor to estimate a carrier offset between the carrier frequency and a local oscillator frequency based on the filtered output of the lowpass filters.
摘要翻译：用于估计载波偏移的系统包括：发射机，被配置为发送正交调制信号;以及接收机。所述接收机包括被配置为接收所述正交调制信号的输入端，被配置为在所述正交调制信号的载波频率上产生余弦和正弦波的本地振荡器，配置成产生载波频率解调输出的至少一个余弦混频器，至少一个配置为产生载波频率解调输出的多个低通滤波器，多个低通滤波器，被配置为对余弦和正弦混频器的解调输出进行滤波，以产生滤波余弦和正弦信号分量;以及载波偏移检测处理器，用于估计载波偏移基于低通滤波器的滤波输出的载波频率和本地振荡器频率。

86. 发明授权

US06904098B1 Linear phase robust carrier recovery for QAM modems 失效
标题翻译： QAM调制解调器的线性相位鲁棒载波恢复
公开(公告)号：US06904098B1
公开(公告)日：2005-06-07
申请号：US09981085
申请日：2001-10-16
申请人： David Bruce Isaksen , Byron Esten Danzer
发明人： David Bruce Isaksen , Byron Esten Danzer
IPC分类号： H03J7/02 , H04L5/12 , H04L25/03 , H04L25/06 , H04L27/00 , H04L27/38
CPC分类号： H04L25/03019 , H03D2200/0047 , H03J7/02 , H04L7/0029 , H04L25/063 , H04L27/0014 , H04L27/3872 , H04L2027/003 , H04L2027/0036 , H04L2027/0057 , H04L2027/0067 , H04L2027/0069 , H04L2027/0079 , H04L2027/0085
摘要： In a QAM demodulator including an adaptive equalizer, a method of carrier tracking comprising the following steps is disclosed: (A) sampling a QAM signal received from a transmission channel; (B) recovering a symbol clock function from the sampled QAM signal; (C) applying the sampled QAM signal to the adaptive equalizer in order to obtain a QAM equalized signal in a Blind Equalization (BE) mode; (D) using a slicer to locate a nearest plant point for the QAM Blind equalized signal for each recovered symbol clock; (E) using a complex conjugate multiplier to obtain an instantaneous inphase component and an instantaneous quadrature component of a phase angle error signal; (F) using a linear phase detector to obtain an instantaneous phase angle error for each symbol clock; (G) averaging the instantaneous phase angle error signal by using a carrier loop filter; (H) using a complex multiplier to insert an inverse of the averaged phase angle error signal into the QAM Blind equalized signal to compensate for the carrier phase angle error; and (I) repeating the steps (D-H) to close a carrier frequency loop.
摘要翻译：在包括自适应均衡器的QAM解调器中，公开了包括以下步骤的载波跟踪方法：（A）对从传输信道接收的QAM信号进行采样; （B）从采样的QAM信号中恢复符号时钟功能; （C）将采样的QAM信号施加到自适应均衡器，以便以盲均衡（BE）模式获得QAM均衡信号; （D）使用切片器为每个恢复的符号时钟定位用于QAM盲均衡信号的最近植物点; （E）使用复共轭乘法器来获得相位角误差信号的瞬时同相分量和瞬时正交分量; （F）使用线性相位检测器来获得每个符号时钟的瞬时相位角误差; （G）使用载波环路滤波器平均瞬时相位角误差信号; （H），使用复数乘法器将平均相位角误差信号的反相插入到QAM盲均衡信号中，以补偿载波相位角误差; 和（I）重复步骤（D-H）以闭合载波频率回路。

87. 发明申请

US20050008101A1 Computationally efficient demodulation for differential phase shift keying 失效
标题翻译：差分相移键控的计算有效解调
公开(公告)号：US20050008101A1
公开(公告)日：2005-01-13
申请号：US10615880
申请日：2003-07-10
申请人： Sabera Kazi , Robert Becker
发明人： Sabera Kazi , Robert Becker
IPC分类号： H04L7/04 , H04L27/00 , H04L27/233 , H04B1/38
CPC分类号： H04L27/2332 , H04L7/042 , H04L2027/003 , H04L2027/0085
摘要： A DPSK demodulator demodulates DPSK signals in a computationally efficient manner to reduce the power requirements of the DPSK demodulator. A DPSK signal is received, digitized, converted to its in-phase (I) and quadrature (Q) components and filtered to remove noise. The I and Q components are processed to determine a relative phase and frequency offset. The phase is adjusted using the frequency offset. The adjusted phase is converted to an absolute phase, which is then mapped to a symbol representative of one or more bits of data.
摘要翻译： DPSK解调器以计算有效的方式解调DPSK信号，以降低DPSK解调器的功率需求。 DPSK信号被接收，数字化，转换成其同相（I）和正交（Q）分量并进行滤波以去除噪声。处理I和Q分量以确定相对相位和频率偏移。使用频率偏移调整相位。调整后的相位被转换为绝对相位，然后映射到表示一个或多个数据位的符号。

88. 发明申请

US20020155850A1 Method, apparatus and system for synchronization in radio communication systems 有权
标题翻译：用于无线电通信系统中的同步的方法，装置和系统
公开(公告)号：US20020155850A1
公开(公告)日：2002-10-24
申请号：US09840399
申请日：2001-04-23
发明人： Jacobus Haartsen
IPC分类号： H04B007/005
CPC分类号： H04L1/0057 , H04L1/006 , H04L1/0069 , H04L1/0078 , H04L27/00 , H04L2025/0377 , H04L2025/03783 , H04L2027/0085
摘要： Method, apparatus, and system for synchronization in radio communication systems are presented. The method includes the steps of encapsulating symbols in an information stream then modulating the stream. The modulated information stream is then sent over a communication channel at a first robustness level, and the level of robustness of the information stream is then reduced to a second robustness level according to a predetermined function. The modulated information stream is received from the communication channel. The information stream is then demodulated after a first number of symbols have been received, wherein the first number of symbols is less than a second number of symbols that would have to be received to demodulate a corresponding information stream sent over the communication channel only at the second robustness level.
摘要翻译：提出了无线电通信系统中用于同步的方法，装置和系统。该方法包括将符号封装在信息流中然后调制流的步骤。然后，经由通信信道以第一鲁棒性级别发送经调制的信息流，然后根据预定功能将信息流的鲁棒性级别减小到第二鲁棒性级别。从通信信道接收调制信息流。然后在已经接收到第一数量的符号之后解调信息流，其中第一数量的符号小于必须被接收的第二数量的符号，以仅解调通过通信信道发送的对应的信息流第二健壮水平。

89. 发明授权

US06421399B1 Frequency and phase estimation for MPSK signals 失效
公开(公告)号：US06421399B1
公开(公告)日：2002-07-16
申请号：US09035533
申请日：1998-03-05
申请人： Dan Avidor , Colin Alan Warwick
发明人： Dan Avidor , Colin Alan Warwick
IPC分类号： H04L2722
CPC分类号： H04L27/2276 , H04L2027/003 , H04L2027/0048 , H04L2027/0067 , H04L2027/0085
摘要： A frequency and phase estimator simultaneously estimates the frequency and phase of an MPSK modulated signal with a frequency uncertainty range on the order of the symbol rate. The estimator defines a plurality of contiguous bands within the frequency uncertainty range of the signal, estimates the frequency to one of the bands, and utilizes the frequency estimate to derive a phase estimate. In a preferred embodiment, a plurality of signal samples of the frequency shifted signal in each of said bands are accumulated to produce a vector for each band, and the frequency estimate is selected in one of said bands, based upon the magnitude of the corresponding vector. The phase is estimated from the argument of the corresponding vector. The present invention is particularly suited for burst modems or TDMA systems, where frequency and phase estimates must be derived reliably from a limited number of incoming symbols at the beginning of each burst.

90. 发明公开

EP2984802A2 DIGITAL RADIO TRANSMISSIONS 有权
标题翻译： 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）。

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