公开(公告)号：US20110219283A1

公开(公告)日：2011-09-08

申请号：US13116767

申请日：2011-05-26

申请人： Theodore J. Myers ,  Daniel Thomas Werner

发明人： Theodore J. Myers ,  Daniel Thomas Werner

IPC分类号： G06F11/08

CPC分类号： H03J7/02 ,  H04B1/7103 ,  H04J3/0685 ,  H04J13/00 ,  H04J13/0029 ,  H04L1/0038 ,  H04L1/0046 ,  H04L1/0057 ,  H04L1/0061 ,  H04L1/1819 ,  H04L1/1867 ,  H04L7/0004 ,  H04L27/233 ,  H04L2027/0065

摘要： This disclosure relates to method, device and system for measuring signal quality in a communication system. An access point receives an uplink signal from a transmitter. The uplink signal contains a data portion and a result of a hash function. The uplink signal is received at a time based on a slot start time and a random timing offset and is received while a portion of a second signal is received from a second transmitter. The access point measures a noncoherent energy metric for the uplink signal. The access point computes a local result of the hash function using the data portion. The uplink signal is then discarded if the result of the hash function matches the local result of the hash function but the noncoherent energy metric is below a threshold value.

摘要翻译： 本公开涉及用于测量通信系统中的信号质量的方法，装置和系统。 接入点接收来自发射机的上行链路信号。 上行链路信号包含数据部分和散列函数的结果。 基于时隙开始时间和随机定时偏移，一次接收上行链路信号，并且在从第二发射机接收到第二信号的一部分时接收上行链路信号。 接入点测量上行链路信号的非相干能量度量。 接入点使用数据部分计算散列函数的局部结果。 如果散列函数的结果与散列函数的本地结果匹配，但是非相干能量度量低于阈值，则上行链路信号被丢弃。

公开(公告)号：US20100281339A1

公开(公告)日：2010-11-04

申请号：US12770630

申请日：2010-04-29

申请人： Theodore J. Myers ,  Daniel Thomas Werner ,  Kenneth C. Sinsuan

发明人： Theodore J. Myers ,  Daniel Thomas Werner ,  Kenneth C. Sinsuan

IPC分类号： H03M13/15 ,  G06F11/10

CPC分类号： H03J7/02 ,  H04B1/7103 ,  H04J3/0685 ,  H04J13/00 ,  H04J13/0029 ,  H04L1/0038 ,  H04L1/0046 ,  H04L1/0057 ,  H04L1/0061 ,  H04L1/1819 ,  H04L1/1867 ,  H04L7/0004 ,  H04L27/233 ,  H04L2027/0065

摘要： This disclosure relates to method, device and system for compensating for information not received in a communication system. An encoded signal is created from a source signal using a forward error correction technique. A first predetermined part of the encoded signal is transmitted. A second predetermined part of the encoded signal is transmitted. Transmission of the second predetermined part of the encoded signal is terminated after a determination of a successful decoding of the encoded signal is made.

摘要翻译： 本公开涉及用于补偿未在通信系统中接收的信息的方法，设备和系统。 使用前向纠错技术从源信号产生编码信号。 发送编码信号的第一预定部分。 发送编码信号的第二预定部分。 编码信号的第二预定部分的传输在确定编码信号的成功解码之后终止。

公开(公告)号：US20100208853A1

公开(公告)日：2010-08-19

申请号：US12372378

申请日：2009-02-17

申请人： Dayou Qian ,  Jianjun Yu ,  Ting Wang

发明人： Dayou Qian ,  Jianjun Yu ,  Ting Wang

IPC分类号： H03D1/04 ,  H03M7/00

CPC分类号： H04L27/233

摘要： A system and method to adjust the symbol constellation used to de-map a signal in an optical coherent communications system. A feedback de-mapper adjustment module is configured to compare average Error Vector Magnitude and Bit Error Ratio to a pre-defined table to determine when a constellation de-mapper mismatch occurs. The feedback de-mapper adjustment module then rotates the de-mapper constellation in order to compensate for phase drift.

摘要翻译： 一种用于调整用于在光学相干通信系统中去映射信号的符号星座的系统和方法。 反馈解映射器调整模块被配置为将平均误差矢量幅度和误码率与预定义的表进行比较，以确定何时发生星座解映射器失配。 反馈解映射器调整模块随后旋转去映射器星座以便补偿相位漂移。

公开(公告)号：US07636399B2

公开(公告)日：2009-12-22

申请号：US11418151

申请日：2006-05-05

申请人： Colin Brown ,  Philip Vigneron

发明人： Colin Brown ,  Philip Vigneron

IPC分类号： H04K1/10

CPC分类号： H03M13/2957 ,  H03M13/13 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/23 ,  H03M13/6325 ,  H04L1/005 ,  H04L27/233

摘要： The invention relates to a method of non-coherent decoding an encoded CPM signal received by a wireless receiver, and a CPM decoder implementing the method, wherein the signal is generated by a transmitter using a serial concatenation of an outer encoder, an interleaver and an M-ary CPM modulator, and may have a frequency-hopping RF carrier. In a preferred embodiment, the method includes iteratively decoding the received signal by first recursively finding a sub-set of dominant sequences of CPM symbols that maximize a path metric for one hop interval using a non-coherent CPM detector, determining on the basis of this sub-set a sequence of soft inner bits, decoding these soft inner bits with an outer decoder, and using extrinsic information for the soft inner bits provided by the outer decoder to iteratively update the sub-set of dominant sequences of CPM symbols in the inner CPM detector.

摘要翻译： 本发明涉及一种对由无线接收机接收的编码CPM信号进行非相干解码的方法，以及实现该方法的CPM解码器，其中该信号由发送器使用外部编码器，交织器和 M-ary CPM调制器，并且可以具有跳频RF载波。 在优选实施例中，该方法包括通过首先递归地找到使用非相干CPM检测器来最大化一跳间隔的路径度量的CPM符号的主要序列的子集，来迭代地解码接收的信号，基于该 对软内部比特序列进行分组，用外部解码器对这些软内部比特进行解码，并使用由外部解码器提供的软内部比特的外在信息来迭代地更新内部的CPM符号的主要序列子集 CPM检测器

公开(公告)号：US20080309436A1

公开(公告)日：2008-12-18

申请号：US12051098

申请日：2008-03-19

申请人： Takafumi Yamaji ,  Rui Ito ,  Tetsuro Itakura

发明人： Takafumi Yamaji ,  Rui Ito ,  Tetsuro Itakura

IPC分类号： H03H11/00 ,  H03F3/00 ,  H04L25/00

CPC分类号： H04L27/3854 ,  H03F3/19 ,  H03F3/211 ,  H03F2200/451 ,  H04B1/40 ,  H04L27/233

摘要： A non-inverting amplifier includes n external input terminals which receive n (n≧3) input voltage signals having a constant sum of voltages, respectively, n amplification units each including n−1 internal input terminals connected to n−1 terminals of the n external input terminals in a different combination for each of the amplification units, n−1 voltage-to-current converters which convert input voltage signals from the internal input terminals into current signals, and a load which converts an added current signal obtained by adding up the current signals into an output voltage signal, and n external output terminals which output n output voltage signals from the n amplification units.

摘要翻译： 非反相放大器包括n个外部输入端子，其分别接收具有恒定电压和的n（n> = 3）个输入电压信号，n个放大单元，每个放大单元包括n-1个内部输入端子，其连接到 n个不同组合的外部输入端子用于每个放大单元，n-1个电压 - 电流转换器，其将来自内部输入端子的输入电压信号转换为电流信号;以及负载，其将通过添加获得的相加电流信号 将电流信号提升为输出电压信号，以及从n个放大单元输出n个输出电压信号的n个外部输出端子。

公开(公告)号：US20080061870A1

公开(公告)日：2008-03-13

申请号：US11836141

申请日：2007-08-08

申请人： Wang Tingwu ,  Pan Ju Yan ,  Yu Yang ,  Hu Saigui ,  Tomisawa Masayuki

发明人： Wang Tingwu ,  Pan Ju Yan ,  Yu Yang ,  Hu Saigui ,  Tomisawa Masayuki

IPC分类号： H04L27/22

CPC分类号： H04L27/233 ,  H04L27/0014 ,  H04L27/22 ,  H04L27/2275 ,  H04L2027/0026

摘要： An apparatus for demodulating an analogue input signal comprises a hard limiter stage (4) for converting the signal to a two level signal, A digital down converter/low pass filter stage (6) converts the signal to a base band signal, and a symbol synchronization stage (8) extracts symbol timing. An instantaneous phase detector (10) calculates the instantaneous phase of the one or more symbols associated with the input signal. If the input signal has been modulated according to a pi/4DQPSK, pi/2DBPSK, GMSK, or a GFSK modulation scheme, a differential detector (12) determines a difference in the phase between adjacent symbols, a coarse frequency offset compensation stage (14) applies a compensation signal to compensate for frequency offset, and a frequency offset estimation stage (16) updates this compensation signal. A demapper (18) generates a demodulated output signal after compensation by the frequency offset compensation stage.

摘要翻译： 用于解调模拟输入信号的装置包括用于将信号转换为二电平信号的硬限幅器级（4），A数字下变频器/低通滤波器级（6）将信号转换为基带信号，以及符号 同步级（8）提取符号定时。 瞬时相位检测器（10）计算与输入信号相关联的一个或多个符号的瞬时相位。 如果输入信号已经根据pi / 4DQPSK，pi / 2DBPSK，GMSK或GFSK调制方案调制，则差分检测器（12）确定相邻符号之间的相位差，粗频率偏移补偿级（14 ）施加补偿信号以补偿频率偏移，并且频率偏移估计级（16）更新该补偿信号。 解映射器（18）通过频率偏移补偿级在补偿后产生解调输出信号。

公开(公告)号：US20070230620A1

公开(公告)日：2007-10-04

申请号：US11390763

申请日：2006-03-28

申请人： Yefim Poberezhskiy

发明人： Yefim Poberezhskiy

IPC分类号： H04L27/20 ,  H04L27/22

CPC分类号： H04L27/2071 ,  H04L27/233

摘要： Methods, apparatus, and systems for alternating quadratures differential binary phase shift keying (AQDBPSK) modulation and demodulation radically increase overall energy efficiency of a communication system due to the combined effect of efficient utilization of transmitter power, high noise immunity of modulation and demodulation, fast synchronization, and simple implementation. Efficient utilization of transmitter power is achieved because radical reduction of side lobe regeneration provided by AQDBPSK allows operation of all amplifiers of the transmitter analog signal path, including power amplifiers, in energy efficient nonlinear mode (for example, they can operate as class C amplifiers) without causing interchannel interference. AQDBPSK radically reduces side lobe regeneration by limiting phase transitions between adjacent in time modulator output symbols to ±90° and smoothly executing the transitions. High noise immunity of AQDBPSK is achieved due to transmitting modulator input data by binary 0° and 180° phase differences between adjacent in time same parity modulator output symbols and optimal noncoherent demodulation of the received same parity symbols. Use of noncoherent demodulation reduces synchronization time, and fast synchronization substantially lowers energy consumption during burst transmissions. Proposed methods of modulation, noncoherent demodulation, and synchronization can easily be realized using the simplest digital signal processing operations and the simplest digital circuits. These methods can also be implemented in a universal reconfigurable digital modem. This enables significant reduction of power consumption in real world applications. In addition, entirely digital realization of the proposed methods, apparatus, and systems make them resistant to all destabilizing factors and simplifies their practical implementation; and fast and reliable synchronization increases time allocated for data transmission when transmission time is limited.

公开(公告)号：US07277504B2

公开(公告)日：2007-10-02

申请号：US10603469

申请日：2003-06-25

申请人： Gerrit Smit

发明人： Gerrit Smit

IPC分类号： H04L27/22

CPC分类号： H04L27/233 ,  H04L27/0014

摘要： A system for estimating the modulation index and frequency offset of a CPM signal. An estimator filters the received signal and utilizes a training sequence to determine the modulation index and frequency offset of the CPM signal. The estimator can also include a post-processing step to eliminate all or part of a bias that might be created by the estimator.

摘要翻译： 用于估计CPM信号的调制指数和频率偏移的系统。 估计器对接收的信号进行滤波并利用训练序列来确定CPM信号的调制指数和频率偏移。 估计器还可以包括后处理步骤，以消除估计器可能创建的全部或部分偏差。

公开(公告)号：US5093848A

公开(公告)日：1992-03-03

申请号：US469082

申请日：1990-01-23

申请人： Alex K. Raith

发明人： Alex K. Raith

IPC分类号： H04L27/14 ,  H04L7/00 ,  H04L25/03 ,  H04L27/16 ,  H04L27/18 ,  H04L27/233

CPC分类号： H04L27/233

摘要： The invention relates to a method and an arrangement for controlling the frequency of a radio-receiver which receives signal-sequences which have been subjected to interference and which include a synchronizing-sequence and a data-sequence. A signal-sequence is converted into signal-points intended for analysis. A Viterbi-analyzer is adapted to the prevailing interferences with the aid of the synchronizing-sequence. The data-sequence is Viterbi-analyzed through a large number of calculating stages to determine the bit-sequence of the data-sequence. A bit-sequence is extracted during the Viterbi-analysis, with a time-delay, subsequent to effecting a few calculating stages, and a corresponding extracted signal-point is calculated. The analysis-intended signal-point corresponding to the extracted signal-point is divided, time-delayed, and phase-compared with the extracted signal-point. Corresponding phase-comparisons are made with respect to consecutive signal-points in the data-sequence, and the angular magnitudes obtained in the phase-comparison are low-pass filtered and integrated to form an angle-shift signal (V). The analysis-intended signal-points are displaced angularly by the angle-shift signal (V) prior to the Viterbi-analysis.

公开(公告)号：US4612518A

公开(公告)日：1986-09-16

申请号：US738441

申请日：1985-05-28

申请人： Michael J. Gans ,  Martin V. Schneider ,  Ralph F. Trambarulo

发明人： Michael J. Gans ,  Martin V. Schneider ,  Ralph F. Trambarulo

IPC分类号： H04L27/20 ,  H04L27/233 ,  H04L27/22

CPC分类号： H04L27/233

摘要： The present invention relates to a QPSK modulator or demodulator for modulating two different input bit streams with a subharmonic pump carrier signal to produce an appropriately encoded QPSK output signal. The subharmonic pump carrier signal used is a submultiple of a predetermined microwave or millimeter-wave carrier frequency. The QPSK modulator or demodulator is capable of being fabricated on a planar substrate using appropriate stripline filters and a mixer diode in each of an in-phase and quadrature signal path. A fin line arrangement, also capable of fabrication on the substrate, can be used to introduce an appropriately phased subharmonic pump carrier signal into each of the in-phase and quadrature signal paths before each mixer diode. Each mixer diode mixes the associated data bit stream and one of the two appropriately phased pump carrier signals to produce separate output signals which modulate along separate orthogonal axes, which output signals are combined to produce the QPSK modulator output signal.

摘要翻译： 本发明涉及用于利用次谐波泵载波信号调制两个不同输入比特流以产生适当编码的QPSK输出信号的QPSK调制器或解调器。 所使用的次谐波泵载波信号是预定微波或毫米波载波频率的一个微分。 QPSK调制器或解调器能够使用适当的带状线滤波器和在同相和正交信号路径中的每一个中的混频器二极管在平面衬底上制造。 可以使用也可以在衬底上制造的鳍线布置，以在每个混频器二极管之前将适当分阶段的次谐波泵载波信号引入到每个同相和正交信号路径中。 每个混频器二极管将相关联的数据位流和两个适当相位的泵载波信号中的一个相混合以产生分离的输出信号，其沿着分离的正交轴进行调制，该输出信号被组合以产生QPSK调制器输出信号。