公开(公告)号：US5828705A

公开(公告)日：1998-10-27

申请号：US593154

申请日：1996-02-01

申请人： Brian W. Kroeger ,  Jeffrey S. Baird

发明人： Brian W. Kroeger ,  Jeffrey S. Baird

IPC分类号： H04L27/00 ,  H04L27/233 ,  H04L27/14 ,  H04L27/16 ,  H04L27/22

CPC分类号： H04L27/2332 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0073

摘要： The carrier tracking loop technique and apparatus provides smooth, accurate frequency tracking, fast reacquisition and doppler tracking over a wide dynamic range. The loop parameters of the carrier tracking loop are varied as a function of mode, i.e. flywheel, tracking or reacquisition modes. The various modes of operation are automatically detected and loop operation is enhanced by non-linear techniques. The enhancements include fourth power sample normalization to improve performance over a large dynamic range and to ease fixed point scaling. A slope limiter is included which aids in coherent detection by reducing phase noise introduced by the carrier tracking loop. Also, a predifferentiation filter further aids in coherent detection by reducing phase noise.

摘要翻译： 载波跟踪环路技术和装置在宽动态范围内提供平稳，准确的频率跟踪，快速重新采集和多普勒跟踪。 作为模式的函数，即飞轮，跟踪或重新获取模式，载波跟踪环路的循环参数是变化的。 自动检测各种操作模式，通过非线性技术增强循环操作。 增强功能包括第四次功率样本归一化，以提高在大动态范围内的性能，并简化固定点缩放。 包括一个斜率限制器，通过减少由载波跟踪环路引入的相位噪声来帮助进行相干检测。 此外，预分化滤波器还通过减少相位噪声来辅助相干检测。

公开(公告)号：US5684835A

公开(公告)日：1997-11-04

申请号：US322846

申请日：1994-10-13

申请人： Brian W. Kroeger ,  Joseph B. Bronder ,  Jeffrey S. Baird

发明人： Brian W. Kroeger ,  Joseph B. Bronder ,  Jeffrey S. Baird

IPC分类号： H04L27/00 ,  H04L27/233 ,  H03D3/22 ,  H04L27/22

CPC分类号： H04L27/2332 ,  H04L2027/003 ,  H04L2027/0048

摘要： A locally coherent Quadrature Phase Shift Keying (QPSK) detector that uses a normalized fourth power weighting technique to generate an ambiguous local phase reference of a current symbol. A phase adjusted previous symbol reference is used to resolve the ambiguity using differentially coded data and yield current soft symbol information.

摘要翻译： 本地相干正交相移键控（QPSK）检测器，其使用归一化的第四功率加权技术来产生当前符号的模糊的局部相位参考。 使用相位调整的先前符号参考来使用差分编码数据解析模糊度并且产生当前软符号信息。

公开(公告)号：US5566214A

公开(公告)日：1996-10-15

申请号：US491667

申请日：1995-06-19

申请人： Brian W. Kroeger ,  Jeffrey S. Baird

发明人： Brian W. Kroeger ,  Jeffrey S. Baird

IPC分类号： H04L27/22 ,  H04L7/00

CPC分类号： H04L27/22

摘要： A QPSK demodulator symbol tracking loop including automatic noise normalization and reacquisition control enables improved symbol tracking and acquisition during fading or intermittent channel conditions. A noise variance estimate is determined and the symbol tracking loop flywheels when the signal level dips below a flywheel threshold relative to the noise variance estimate during fading or intermittent channel conditions. Determination in advance of an absolute power level of the thermal noise floor of analog front end components is dispensed with and precise control of the gain and noise level of the analog front end components is not needed, thus simplifying design. A reacquisition mode is declared upon determination of an abrupt increase in signal level indicative of emergence from a fading condition or upon detection of an excessive symbol tracking error signal. During the reacquisition mode, the loop gain of the symbol tracking loop is temporarily increased to improve reacquisition time.

摘要翻译： 包括自动噪声归一化和重新获取控制的QPSK解调器符号跟踪环能够在衰落或间歇信道条件下改进符号跟踪和采集。 确定噪声方差估计，并且当信号电平在衰落或间歇信道条件期间相对于噪声方差估计下降到飞轮阈值以下时，符号跟踪环路飞行。 模拟前端部件的热噪声基底的绝对功率水平之前的确定被省略，并且不需要对模拟前端部件的增益和噪声电平的精确控制，从而简化了设计。 在确定指示从衰落状态出现或者在检测到过多的符号跟踪误差信号的信号电平突然增加时，声明重新获取模式。 在重新获取模式期间，暂时增加符号跟踪循环的环路增益，以提高重新获取时间。

公开(公告)号：US5404375A

公开(公告)日：1995-04-04

申请号：US110265

申请日：1993-08-23

申请人： Brian W. Kroeger ,  Richard E. Martinson

发明人： Brian W. Kroeger ,  Richard E. Martinson

IPC分类号： H04B7/216 ,  H04K1/00

CPC分类号： H04B7/216

摘要： A system for transmitting and receiving outbound and inbound data signals through a satellite communications network, the system having a network data rate and including a satellite and an end user transceiver, the system comprising a half-duplex mobile transceiver for transmitting and receiving the inbound and outbound data signals, respectively, for spreading the inbound data signal from the network data rate to a reduced data rate having an increased signal-to-noise ratio using a spread sequence, and for despreading the outbound data signal from the reduced data rate to the network data rate. The system also comprises an earth station, coupled to the end user transceiver, for transmitting and receiving the outbound and inbound data signals, wherein the earth station includes means for spreading the outbound data signal from the network data rate to the reduced data rate using the spread sequence, and means for despreading the inbound data signal from the reduced data rate to the network data rate, and wherein the end-user transceiver includes means for transmitting the outbound data signal and for receiving the inbound data signal.

摘要翻译： 一种用于通过卫星通信网络发送和接收出站和入站数据信号的系统，该系统具有网络数据速率，并且包括卫星和终端用户收发信机，该系统包括用于发送和接收入站和接收的半双工移动收发信机 用于将入站数据信号从网络数据速率扩展到使用扩展序列具有增加的信噪比的降低的数据速率的出站数据信号，并且用于将出站数据信号从减小的数据速率解扩到 网络数据速率。 该系统还包括耦合到最终用户收发信机的用于发送和接收出站和入站数据信号的地球站，其中，地球站包括用于使用所述网络数据速率将出站数据信号从网络数据速率扩展到降低的数据速率的装置 扩展序列，以及用于将入站数据信号从减小的数据速率解扩到网络数据速率的装置，并且其中终端用户收发器包括用于发送出站数据信号和用于接收入站数据信号的装置。

公开(公告)号：US4937828A

公开(公告)日：1990-06-26

申请号：US267404

申请日：1988-11-04

申请人： Hubert Shih ,  Brian W. Kroeger ,  Robert J. Delcoco

发明人： Hubert Shih ,  Brian W. Kroeger ,  Robert J. Delcoco

IPC分类号： H03M13/09

CPC分类号： H03M13/091

摘要： A cyclic redundancy check generator for a high speed data bus is capable of outputting frames of data and cyclic redundancy check bits concatenated together without any additional space or time delay between frames while operating at a normal clock speed. Data to be transmitted is parallel loaded into series-connected registers via multiplexers connected between the registers. The multiplexers also provide parallel loading of the cyclic redundancy check bits for a frame of data from a look-ahead cyclic redundancy check logic circuit. The output of the logic circuit is also connected to a cyclic redundancy check register. The logic circuit has inputs connected to the final series-connected data register and the cyclic redundancy check register. The logic circuit operates on portions of words in a frame of data and when the last portion of the last word has been processed, the output from the logic circuit is selected by the multiplexers and then shifted out of the data registers immediately behind the last word of the frame. After the last portion of the cyclic redundancy check bits have been output from the final register, the first word in the next frame is parallel loaded into the registers and the cyclic redundancy check register is initialized so that processing of the first word of the next frame can begin in the logic circuit.

摘要翻译： 用于高速数据总线的循环冗余校验发生器能够在以正常时钟速度操作的同时在帧之间输出数据帧和循环冗余校验位，而不会在帧之间任何额外的空间或时间延迟。 要发送的数据通过连接在寄存器之间的复用器并行加载到串联寄存器中。 多路复用器还提供来自前瞻循环冗余校验逻辑电路的数据帧的循环冗余校验位的并行加载。 逻辑电路的输出也连接到循环冗余校验寄存器。 逻辑电路具有连接到最终串联数据寄存器和循环冗余校验寄存器的输入。 逻辑电路对数据帧中的字的部分进行操作，当最后一个字的最后部分被处理时，逻辑电路的输出由多路复用器选择，然后从最后一个字后面的数据寄存器中移出 的框架。 在从最终寄存器输出循环冗余校验位的最后部分之后，下一帧中的第一个字被并行加载到寄存器中，循环冗余校验寄存器被初始化，以便处理下一帧的第一个字 可以在逻辑电路中开始。

公开(公告)号：US08817917B2

公开(公告)日：2014-08-26

申请号：US13165325

申请日：2011-06-21

申请人： Brian W. Kroeger ,  Paul J. Peyla

发明人： Brian W. Kroeger ,  Paul J. Peyla

IPC分类号： H04L27/06 ,  H04L27/26 ,  H04B7/08 ,  H04B17/00 ,  H04L1/20

CPC分类号： H04B7/0814 ,  H04B7/02 ,  H04B7/0805 ,  H04B17/29 ,  H04B17/309 ,  H04H2201/12 ,  H04H2201/18 ,  H04H2201/19 ,  H04H2201/20 ,  H04L1/20 ,  H04L27/2663 ,  H04L27/2678

摘要： A method for detecting the digital quality of a radio signal includes: receiving a radio signal including a digital portion modulated by a series of symbols each including a plurality of samples; computing correlation points between endpoint samples in cyclic prefix regions of adjacent symbols; and using the correlation points to produce a digital signal quality metric. Receivers that implement the method are also provided.

摘要翻译： 一种用于检测无线电信号的数字质量的方法包括：接收包括由包括多个采样的一系列符号调制的数字部分的无线电信号; 计算相邻符号的循环前缀区域中的端点样本之间的相关点; 并使用相关点来产生数字信号质量度量。 还提供了实现该方法的接收器。

公开(公告)号：US08798196B2

公开(公告)日：2014-08-05

申请号：US13012847

申请日：2011-01-25

申请人： Brian W. Kroeger

发明人： Brian W. Kroeger

IPC分类号： H04K1/02

CPC分类号： H04L27/2623

摘要： A method includes: (a) modulating a set of subcarriers with a set of data to produce a modulated OFDM symbol vector; (b) modulating a FM carrier signal with the set of data to produce a modulated FM symbol; (c) combining the modulated OFDM symbol and the modulated FM symbol to produce a modulated hybrid symbol; (d) limiting the magnitude of the modulated hybrid symbol to produce a first limited modulated hybrid symbol; (e) demodulating the first limited modulated hybrid symbol to recover distorted QPSK constellations; (f) constraining the distorted QPSK constellations to values greater than or equal to a minimum threshold value to produce constrained QPSK constellations; (g) demodulating the modulated hybrid symbol to produce a demodulated hybrid symbol vector; (h) subtracting the demodulated FM symbol vector from the Hybrid symbol vector to produce modified OFDM symbol vector; (i) applying a mask to inactive subcarriers in the plurality of subcarriers of the OFDM symbol vector; (j) modulating an OFDM symbol vector with OFDM modulation to produce a modified modulated OFDM symbol; (k) combining the modulated OFDM symbol and the modulated FM symbol to produce a modulated hybrid symbol; and (l) outputting the modified modulated hybrid symbol.

摘要翻译： 一种方法包括：（a）用一组数据调制一组子载波以产生经调制的OFDM符号向量; （b）用该组数据调制FM载波信号以产生经调制的FM符号; （c）组合经调制的OFDM符号和经调制的FM符号以产生调制的混合符号; （d）限制调制的混合符号的大小以产生第一有限调制混合符号; （e）解调第一有限调制混合符号以恢复失真的QPSK星座; （f）将失真的QPSK星座约束到大于或等于最小阈值的值以产生受限的QPSK星座; （g）解调调制的混合符号以产生解调的混合符号向量; （h）从混合符号向量中减去解调的FM符号向量以产生修改的OFDM符号向量; （i）对OFDM符号向量的多个子载波中的无效子载波应用掩码; （j）使用OFDM调制调制OFDM符号向量以产生修改的调制OFDM符号; （k）组合调制的OFDM符号和调制的FM符号以产生调制的混合符号; 和（l）输出修改后的调制混合符号。

公开(公告)号：US07546088B2

公开(公告)日：2009-06-09

申请号：US10898829

申请日：2004-07-26

申请人： Brian W. Kroeger ,  Marek Milbar

发明人： Brian W. Kroeger ,  Marek Milbar

IPC分类号： H04B1/00

CPC分类号： H04H20/30 ,  H04H40/18 ,  H04H60/11 ,  H04H60/12

摘要： A method for processing a composite digital audio broadcast signal to mitigate intermittent interruptions in the reception of the digital audio broadcast signal, the method comprising the steps of separating an analog audio portion of the digital audio broadcast signal from a digital audio portion of the digital audio broadcast signal, detecting errors in the digital audio portion of the digital audio broadcast signal, adjusting the digital audio portion of the digital audio broadcast signal in response to errors in the digital audio portion of the digital audio broadcast signal to produce an adjusted digital audio portion, and blending the analog audio portion with the adjusted digital audio portion to produce an audio output. A receiver that performs the method is also included.

摘要翻译： 一种用于处理复合数字音频广播信号以减轻数字音频广播信号的接收中的间歇性中断的方法，所述方法包括以下步骤：将数字音频广播信号的模拟音频部分与数字音频的数字音频部分分离 广播信号，检测数字音频广播信号的数字音频部分中的错误，响应于数字音频广播信号的数字音频部分中的错误，调整数字音频广播信号的数字音频部分，以产生经调整的数字音频部分 并且将模拟音频部分与经调整的数字音频部分混合以产生音频输出。 还包括执行该方法的接收器。

公开(公告)号：US5598441A

公开(公告)日：1997-01-28

申请号：US322840

申请日：1994-10-13

申请人： Brian W. Kroeger ,  Joseph B. Bronder ,  Jeffrey S. Baird

发明人： Brian W. Kroeger ,  Joseph B. Bronder ,  Jeffrey S. Baird

IPC分类号： H04L27/00 ,  H04L27/233 ,  H03D1/00

CPC分类号： H04L27/2332 ,  H04L2027/003 ,  H04L2027/0057

摘要： A method and apparatus for estimating a frequency of a received carrier wave in a Quadrature Phase Shift Keying (QPSK) system. The invention uses a combination of an FFT, DFT bins, and three point interpolation to estimate a frequency of the carrier wave. The system is robust and compensates for multipath fading and other types of signal degradation.

摘要翻译： 一种用于估计正交相移键控（QPSK）系统中的接收载波频率的方法和装置。 本发明使用FFT，DFT仓和三点内插的组合来估计载波的频率。 该系统是稳健的，并补偿多路径衰落和其他类型的信号衰减。

公开(公告)号：US5523726A

公开(公告)日：1996-06-04

申请号：US322833

申请日：1994-10-13

申请人： Brian W. Kroeger ,  Roy Stehlik

发明人： Brian W. Kroeger ,  Roy Stehlik

IPC分类号： H04L27/20 ,  H03C3/00 ,  H04L27/18

CPC分类号： H04L27/2092

摘要： A digital quadriphase-shift keying modulator is described which generates a modulated intermediate carrier frequency (IF) based on a desired number of samples for each input information bit. The design includes a ROM (or RAM) look-up table which stores digitized waveforms. The inphase and quadrature components of a complex baseband signal are translated to an IF at a multiple of the sampling rate simply by alternating the inphase and quadrature samples and alternating signs. The real IF output is produced by summing the inphase and quadrature signals.

摘要翻译： 描述了一种数字四相移键控调制器，其基于每个输入信息比特的期望数目的样本产生调制的中间载波频率（IF）。 该设计包括存储数字化波形的ROM（或RAM）查找表。 复杂基带信号的同相和正交分量简单地通过交替相位和正交样本和交替符号而以采样率的倍数转换为IF。 实际的IF输出是通过对同相和正交信号求和来产生的。