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1. 发明申请

US20170359202A1 BLIND CHANNEL EQUALISER 审中-公开
公开(公告)号：US20170359202A1
公开(公告)日：2017-12-14
申请号：US15536822
申请日：2015-12-16
申请人： CONTINENTAL AUTOMOTIVE FRANCE , CONTINENTAL AUTOMOTIVE GmbH
发明人： Gerald SOULIER
IPC分类号： H04L25/03
CPC分类号： H04L25/0305 , H04L25/03184 , H04L2025/03401 , H04L2025/03477 , H04L2025/0363 , H04L2025/03675 , H04L2025/03687
摘要： A blind channel equalizer device for a radiofrequency receiver suitable for modulating the constant envelope signal of the transmission includes: an adjustable linear digital filter, defined at a point in time by the coefficients) thereof, able to filter an input signal in order to produce an output signal; an estimator able to estimate a power of the input signal; an adapter able to adapt the filter by calculating the coefficients of the filter at a point in time by subtracting, from the filter coefficients at a preceding point in time, the gradient of a cost function assigned with a correction coefficient. The cost function includes a first distance criterion between the square of the output signal and the power, wherein the correction coefficient is a product including a constant convergence coefficient and a scaling coefficient inversely proportional to the square of the power. Also disclosed is a related Radiofrequency receiver.

2. 发明申请

US20160142149A1 System and Methods for Adaptive Equalization for Optical Modulation Formats 有权
公开(公告)号：US20160142149A1
公开(公告)日：2016-05-19
申请号：US14968005
申请日：2015-12-14
申请人： AT&T Intellectual Property I, LP
发明人： Xiang Zhou , Lynn Nelson
IPC分类号： H04B10/532 , H04J14/06 , H04L25/03
CPC分类号： H04B10/532 , H04B10/6166 , H04J14/06 , H04L25/03038 , H04L25/03057 , H04L2025/03401 , H04L2025/0342 , H04L2025/03687
摘要： A method for modifying the performance of an adaptive equalizer in a receiver is provided. A carrier wave comprising a first polarization state and a second polarization state, wherein there is a correlation between the first polarization state and the second polarization state, is received. The first polarization state and the second polarization state are demultiplexed to generate two respective constellations. A first expected value based on the first constellation, and a second expected value based on the second constellation, are calculated. An adaptive equalizer receives a first and second signals associated with the respective polarization states. The adaptive equalizer generates outputs based on the signals. These outputs are used to generate error values. Feedback is input into the adaptive equalizer, wherein the feedback is based on the error values.

3. 发明授权

US08923429B2 Overlay modulation of COFDM using phase and amplitude offset carriers 有权
标题翻译：使用相位和幅度偏移载波对COFDM进行叠加调制
公开(公告)号：US08923429B2
公开(公告)日：2014-12-30
申请号：US13646099
申请日：2012-10-05
申请人： Sirius XM Radio, Inc.
发明人： Carl Scarpa , Edward Schell , Christopher Strolle
IPC分类号： H04L27/10 , H04L27/26 , H04L5/00 , H04L27/00 , H04L27/18 , H04L27/20 , H04L27/34 , H04L25/03
CPC分类号： H04L27/2627 , H04L5/0007 , H04L5/0028 , H04L27/0008 , H04L27/0012 , H04L27/183 , H04L27/2053 , H04L27/2071 , H04L27/3488 , H04L2025/03401 , H04L2025/03414
摘要： Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by modulating existing data carriers with a phase and an amplitude offset. In exemplary embodiments of the present invention, additional data capacity can be achieved for an COFDM signal which is completely backwards compatible with existing satellite broadcast communications systems. In exemplary embodiments of the present invention additional information can be overlayed on an existing signal as a combination of amplitude and phase offset from the original QPSK symbols, applied for each information bit of the overlay data. With two additional levels of modulation, a receiver can demodulate the information from each of the previous stages and combine the information into a suitable format for soft decoding. The first stage of demodulation will be recovery of overlay data from the amplitude modulated D8PSK. Because other amplitude variations due to multi-path are also expected, the data gathered from the FFT in the receiver must be equalized to the channel conditions. After channel equalization has been performed, soft overlay data can then be derived from the distance off the unit circle. In order to recover the phase modulated overlay data, the equalized symbols must first be differentially demodulated and corrected for any common phase error offset. After common phase removal, overlay phase information can be obtained.
摘要翻译：提出了系统和方法，用于通过调制具有相位和幅度偏移的现有数据载波来传输先前存在的差分COFDM信号的附加数据。在本发明的示例性实施例中，可以实现与现有卫星广播通信系统完全向后兼容的COFDM信号的附加数据容量。在本发明的示例性实施例中，作为叠加数据的每个信息比特的原始QPSK符号的幅度和相位偏移的组合，附加信息可以叠加在现有信号上。通过两个附加的调制级别，接收机可以解调来自每个先前阶段的信息，并将该信息组合成用于软解码的适当格式。解调的第一阶段将是从幅度调制的D8PSK恢复覆盖数据。由于也预期由于多路径引起的其他幅度变化，所以从接收机中从FFT收集的数据必须与信道条件相等。在执行信道均衡之后，可以从距离单位圆的距离导出软覆盖数据。为了恢复相位调制覆盖数据，必须首先对均衡的符号进行差分解调并校正任何公共相位误差偏移。共相除去后，可以获得覆盖相位信息。

4. 发明授权

US08750407B2 Transmitter and method for transmitting soft pilot symbols in a digital communication system 有权
标题翻译：用于在数字通信系统中发送软导频符号的发射机和方法
公开(公告)号：US08750407B2
公开(公告)日：2014-06-10
申请号：US12239889
申请日：2008-09-29
申请人： Jung-Fu Cheng , Tracy Fulghum , Douglas Cairns
发明人： Jung-Fu Cheng , Tracy Fulghum , Douglas Cairns
IPC分类号： H04L27/00
CPC分类号： H04L25/0236 , H04B2201/70701 , H04B2201/709727 , H04L1/0017 , H04L1/0041 , H04L1/0068 , H04L25/021 , H04L25/0226 , H04L25/03044 , H04L25/03324 , H04L25/061 , H04L27/0012 , H04L27/227 , H04L27/3455 , H04L27/3818 , H04L2001/0098 , H04L2025/03401 , H04L2025/0342 , H04L2025/03426 , H04L2025/03509 , H04L2025/03796 , H04L2027/0061 , H04L2027/0093
摘要： A transmitter, channel coder, and method for coding and transmitting a sequence of symbols in a digital communication system utilizing soft pilot symbols. In one embodiment, the transmitter transmits a set of soft pilot symbols with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16 QAM or 64 QAM. The transmitter shares the modulation type and location (time/frequency/code) of the soft pilot symbols with a receiver. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols. In another embodiment, soft pilot symbols are inserted by low-level puncturing of channel encoded bits and replacing the punctured bits with known bit patterns.
摘要翻译：用于使用软导频符号在数字通信系统中对符号序列进行编码和发送的发射机，信道编码器和方法。在一个实施例中，发射机通过用低阶调制（诸如BPSK或QPSK）调制软导频符号，以较高阶调制方式调制剩余符号，从而发送具有比序列中的剩余符号更高的可靠性的一组软导频符号，作为16 QAM或64 QAM。发射机与接收机共享软导频符号的调制类型和位置（时间/频率/码）。与传统的固定飞行员不同，软飞行员仍然携带一些数据。此外，软导频器在建立解调高阶调制符号时必不可少的幅度参考是特别有用的。在另一个实施例中，通过信道编码比特的低级删截插入软导频符号，并用已知的比特模式替换被删余的比特。

5. 发明授权

US08743946B2 Frequency-domain equalization and combining for single carrier transmission 有权
标题翻译：单载波传输的频域均衡和组合
公开(公告)号：US08743946B2
公开(公告)日：2014-06-03
申请号：US13607253
申请日：2012-09-07
申请人： June Chul Roh
发明人： June Chul Roh
IPC分类号： H03H7/30
CPC分类号： H04L25/03159 , H04L2025/03401 , H04L2025/03509 , H04L2025/03624
摘要： A communication receiver including a time domain receive filter to provide a filtered output, the filtered output including colored noise. The receiver also includes a frequency domain, fractionally-spaced equalizer (FSE) unit to receive the filtered output from the receive filter. The FSE unit determines a separate weighting factor for each subcarrier, and the weighting factor is determined based on a noise variance of the subcarrier.
摘要翻译：一种包括时域接收滤波器以提供滤波输出的通信接收机，滤波后的输出包括彩色噪声。接收机还包括一个频域，分数间隔均衡器（FSE）单元，用于从接收滤波器接收滤波后的输出。 FSE单元为每个子载波确定单独的加权因子，并且基于子载波的噪声方差确定加权因子。

6. 发明授权

US08630337B2 DVB-S2 Demodulator 有权
标题翻译： DVB-S2解调器
公开(公告)号：US08630337B2
公开(公告)日：2014-01-14
申请号：US12787290
申请日：2010-05-25
申请人： Jacques Meyer
发明人： Jacques Meyer
IPC分类号： H03H7/30 , H04B1/10 , H04L27/00
CPC分类号： H04L27/0014 , H04L25/03057 , H04L2025/03401 , H04L2025/0342 , H04L2025/0349 , H04L2027/003 , H04L2027/004 , H04L2027/0057
摘要： A method for demodulating a modulated signal, by: receiving a signal modulated in n-PSK or n-APSK comprising a succession of symbols organized in frames, each frame comprising a header followed by blocks of data symbols separated by blocks of pilot symbols, determining the phase of the headers and pilot blocks to predict the evolution of the signal phase, correcting the phase of the data symbols according to the evolution of the signal phase, and equalizing the data symbols corrected in phase using equalization coefficients evaluated thanks to estimated or known symbols of the signal, and pre-equalizing the header, pilot and data symbols, which is performed before determining the phase of the headers and pilot blocks, and using the estimated equalization coefficients to equalize the data symbols.
摘要翻译：一种用于通过以下方式解调调制信号的方法：接收在n-PSK或n-APSK中调制的信号，所述信号包括以帧组织的一连串符号，每个帧包括一个头部，随后是由导频符号块分隔的数据符号块，确定标头和导频块的相位来预测信号相位的演变，根据信号相位的演变校正数据符号的相位，以及使用经估计或已知的均衡系数评估的相位校正的数据符号的均衡信号的符号，并且在确定报头和导频块的相位之前执行的报头，导频和数据符号的预均衡，并且使用估计的均衡系数来均衡数据符号。

7. 发明申请

US20130287390A1 DIGITAL FILTER DEVICE, DIGITAL FILTERING METHOD AND CONTROL PROGRAM FOR THE DIGITAL FILTER DEVICE 有权
标题翻译：数字滤波器设备，数字滤波器的数字滤波方法和控制程序
公开(公告)号：US20130287390A1
公开(公告)日：2013-10-31
申请号：US13393066
申请日：2011-08-18
申请人： Junichi Abe , Hidemi Noguchi
发明人： Junichi Abe , Hidemi Noguchi
IPC分类号： H04B10/61
CPC分类号： H04B10/616 , H03H17/0202 , H03H2218/04 , H04B3/142 , H04L25/03038 , H04L25/03057 , H04L25/03159 , H04L25/03178 , H04L2025/03401 , H04L2025/03636
摘要： In order to solve a problem of achieving distortion compensation with high accuracy, a digital filter device includes a first distortion compensation filter unit for conducting distortion compensation of first waveform distortion included in an inputted signal through digital signal processing, a first filter coefficient setting unit for setting a filter coefficient of the first distortion compensation filter unit, a second distortion compensation filter unit for compensating second waveform distortion included in a signal outputted from the first distortion compensation filter unit, and a second filter coefficient setting unit for setting a filter coefficient of the second distortion compensation filter unit based on the filter coefficient set by the first filter coefficient setting unit.
摘要翻译：为了以高精度解决失真补偿的问题，数字滤波器装置包括：第一失真补偿滤波器单元，用于通过数字信号处理对包含在输入信号中的第一波形失真进行失真补偿，第一滤波器系数设定单元，设置第一失真补偿滤波器单元的滤波器系数;第二失真补偿滤波器单元，用于补偿从第一失真补偿滤波器单元输出的信号中包括的第二波形失真;以及第二滤波器系数设置单元，用于设置滤波器系数第二失真补偿滤波器单元，其基于由第一滤波器系数设置单元设置的滤波器系数。

8. 发明授权

US08160057B2 Multi-channel optical transport network training signal 有权
标题翻译：多通道光传输网络训练信号
公开(公告)号：US08160057B2
公开(公告)日：2012-04-17
申请号：US12164440
申请日：2008-06-30
申请人： Francesco Caggioni , Omer Acikel , Keith Conroy
发明人： Francesco Caggioni , Omer Acikel , Keith Conroy
IPC分类号： H04L12/28
CPC分类号： H04L1/0009 , H04J3/1652 , H04J2203/0057 , H04L1/0006 , H04L1/004 , H04L25/03019 , H04L2025/03401
摘要： Systems and methods are provided for multi-channel ITU G.709 optical transport network (OTN) communications. The transmission method accepts an ITU G.709 OTN frame including an OTU overhead (OH) section and an ODU section. A forward error correction (FEC) parity section with a training signal is appended to the ITU G.709 OTN frame, to create a training-enhanced (TE) OTN frame. All, or a portion of the TE OTN may be buffered in a tangible memory medium in preparation for striping. The training-enhanced OTN frame is then striped into n parallel streams, and n TE_OTN-PFs (Parallel Frames) are supplied.
摘要翻译：为多通道ITU G.709光传送网（OTN）通信提供了系统和方法。传输方法接受包括OTU开销（OH）部分和ODU部分的ITU G.709 OTN帧。具有训练信号的前向纠错（FEC）奇偶校验部分附加到ITU G.709 OTN帧，以创建训练增强（TE）OTN帧。 TE OTN的全部或部分可以缓冲在有形存储介质中以准备条带化。训练增强型OTN帧被划分成n个并行流，并且提供n个TE_OTN-PF（并行帧）。

9. 发明申请

US20120087311A1 MIXED WAVEFORM CONFIGURATION FOR WIRELESS COMMUNICATIONS 有权
标题翻译：用于无线通信的混合波形配置
公开(公告)号：US20120087311A1
公开(公告)日：2012-04-12
申请号：US13330946
申请日：2011-12-20
申请人： Mark A. Webster , Michael J. Seals
发明人： Mark A. Webster , Michael J. Seals
IPC分类号： H04W4/00
CPC分类号： H04L27/34 , H04L25/0212 , H04L25/03006 , H04L27/0008 , H04L27/2601 , H04L2025/03401 , H04L2025/03414 , H04W84/12
摘要： A mixed waveform configuration for wireless communications including a first portion that is modulated according to a single-carrier modulation scheme and a second portion that is modulated according to a multi-carrier modulation scheme. The waveform is specified so that a channel impulse response (CIR) estimate obtainable from the first portion is reusable for acquisition of the second portion. The first portion includes a preamble and header and the second portion typically incorporates the payload.
摘要翻译：一种用于无线通信的混合波形配置，包括根据单载波调制方案调制的第一部分和根据多载波调制方案调制的第二部分。指定波形，使得可从第一部分获得的信道脉冲响应（CIR）估计可重用于采集第二部分。第一部分包括前同步码和报头，第二部分通常包含有效载荷。

10. 发明授权

US08149929B2 Receiver and method for processing radio signals using soft pilot symbols 有权
标题翻译：用于使用软导频符号处理无线电信号的接收机和方法
公开(公告)号：US08149929B2
公开(公告)日：2012-04-03
申请号：US12239918
申请日：2008-09-29
申请人： Douglas Cairns , Elias Jonsson
发明人： Douglas Cairns , Elias Jonsson
IPC分类号： H04L27/00
CPC分类号： H04L25/0236 , H04B2201/70701 , H04B2201/709727 , H04L1/0017 , H04L1/0041 , H04L1/0068 , H04L25/021 , H04L25/0226 , H04L25/03044 , H04L25/03324 , H04L25/061 , H04L27/0012 , H04L27/227 , H04L27/3455 , H04L27/3818 , H04L2001/0098 , H04L2025/03401 , H04L2025/0342 , H04L2025/03426 , H04L2025/03509 , H04L2025/03796 , H04L2027/0061 , H04L2027/0093
摘要： A receiver and method for receiving and processing a sequence of transmitted symbols in a digital communication system utilizing soft pilot symbols. A set of soft pilot symbols are transmitted with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16QAM or 64QAM. The receiver knows the modulation type and location (time/frequency/code) of the soft pilot symbols, and demodulates them first. The receiver uses the demodulated soft pilot symbols as known symbols to estimate parameters of the received radio signal. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols.
摘要翻译：一种用于在利用软导频符号的数字通信系统中接收和处理发送符号序列的接收机和方法。通过用诸如BPSK或QPSK的低阶调制来调制软导频符号，同时以诸如16QAM或64QAM的更高阶调制来调制剩余的符号，发送一组软导频符号比该序列中的剩余符号更高的可靠性。接收机知道软导频符号的调制类型和位置（时间/频率/码），并首先解调它们。接收机使用解调的软导频符号作为已知符号来估计所接收的无线电信号的参数。与传统的固定飞行员不同，软飞行员仍然携带一些数据。此外，软导频器在建立解调高阶调制符号时必不可少的幅度参考是特别有用的。

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