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1. 发明申请

US20170338985A1 ULTRA LOW POWER WIDEBAND NON-COHERENT BINARY PHASE SHIFT KEYING DEMODULATOR USING FIRST ORDER SIDEBAND FILTERS WITH PHASE 180 DEGREE ALIGNMENT 审中-公开
公开(公告)号：US20170338985A1
公开(公告)日：2017-11-23
申请号：US15522814
申请日：2015-10-29
申请人： Benjamin P. WILKERSON
发明人： Benjamin P. WILKERSON
IPC分类号： H04L27/233
CPC分类号： H04L27/233 , H04L27/2331 , H04L27/2334
摘要： A BPSK demodulator circuit comprises: a sideband-separating and lower sideband signal-delaying unit which separates a modulated signal into a lower sideband and an upper sideband by a primary low pass filter and a primary high pass filter having a cut-off frequency as a carrier frequency, and which outputs an upper sideband analog signal and an analog signal delayed by ¼ of a cycle of the carrier frequency from a lower sideband analog signal; a data demodulating unit which demodulates digital data by means of latching, through a hysteresis circuit, an analog pulse signal appearing in accordance with the phase change part of a signal generated by the sum of the analog signals; and a data clock restoring unit which generates a data clock by using a data signal and a signal having the delayed lower sideband analog signal digitized through a comparator.

2. 发明申请

US20170317871A1 QPSK DEMODULATOR 有权
公开(公告)号：US20170317871A1
公开(公告)日：2017-11-02
申请号：US15272754
申请日：2016-09-22
申请人： National Chiao Tung University
发明人： Chi-Yi LO , Hao-Chiao Hong
IPC分类号： H04L27/38
CPC分类号： H04L27/3881 , H04L27/2331 , H04L27/2602 , Y02D70/122
摘要： A novel quadrature phase-shift keying (QPSK) demodulator, called the bowknot quadrature phase-shift keying (BQPSK) demodulator, is disclosed. The BQPSK demodulator uses a delay circuit to delay a BQPSK signal and mixes the delayed BQPSK signal with the undelayed BQPSK signal to output an I-channel data signal and a Q-channel data signal. The BQPSK demodulator further uses a phase rotation circuit to demodulate the orthogonal data signals and obtain a recovery clock signal. The BQPSK demodulator neither uses an A/D converter nor uses a quadrature oscillator, featuring high data rate, low power consumption, simple architecture and superior reliability. The BQPSK demodulator can be realized by digital circuits and analog circuits.

3. 发明授权

US09344147B1 Appending bursts to create a super burst for improved building penetration 有权
标题翻译：附加突击造成超级爆发，以改善建筑物渗透
公开(公告)号：US09344147B1
公开(公告)日：2016-05-17
申请号：US13246705
申请日：2011-09-27
申请人： Gregory M. Gutt , David A. Whelan
发明人： Gregory M. Gutt , David A. Whelan
IPC分类号： H04L27/00 , H04B3/54 , H04L25/49 , H04L1/00
CPC分类号： H04B3/54 , G01S19/02 , H04L1/0009 , H04L1/0041 , H04L25/49 , H04L25/4902 , H04L27/2331
摘要： A system, method, and apparatus according to various embodiments are disclosed herein to enable a signal in space scheme to have improved signal penetration within buildings and other attenuated environments. The disclosed enhanced signal delivery method transmits multiple bursts in a successive pattern that is known by a receiver on the ground. This successive transmission pattern of bursts effectively creates a longer correlation sequence that allows a receiver to more readily be able to pull the signal out of the noise and, thus, allows a receiver located in a more stringent, attenuated environment to receive a signal where it previously was unable to do so.
摘要翻译：本文公开了根据各种实施例的系统，方法和装置，以使得空间方案中的信号能够在建筑物和其它衰减环境中具有改善的信号穿透。所公开的增强信号传递方法以接地机已知的连续模式发送多个脉冲串。这种连续的突发传输模式有效地创建了更长的相关序列，其允许接收机更容易地将信号拉出噪声，并且因此允许位于更严格的衰减环境中的接收机接收信号以前没有这样做。

4. 发明申请

US20150171895A1 USE OF PARITY-CHECK CODING FOR CARRIER-PHASE ESTIMATION IN AN OPTICAL TRANSPORT SYSTEM 有权
标题翻译：在光学运输系统中使用载波相位估计的奇偶校验编码
公开(公告)号：US20150171895A1
公开(公告)日：2015-06-18
申请号：US14105854
申请日：2013-12-13
申请人： ALCATEL-LUCENT USA INC.
发明人： Timo J. Pfau
IPC分类号： H03M13/00 , H04L27/34 , H04B10/60 , H04L1/00 , G06F11/10
CPC分类号： H03M13/63 , G06F11/10 , H03M13/47 , H03M13/6325 , H03M13/6337 , H04B10/60 , H04B10/6165 , H04L1/0045 , H04L1/0047 , H04L1/0054 , H04L25/03178 , H04L27/223 , H04L27/2331 , H04L27/34 , H04L27/3872 , H04L2027/0038 , H04L2027/0067 , H04L2027/0087
摘要： An optical transport system is configured to use a modulation scheme in which a phase rotation applied to a sequence of PSK or QAM constellation symbols encoding a codeword of an FEC code produces a modified sequence of PSK or QAM constellation symbols encoding a bit-word that is not a valid codeword of that FEC code. Based on this property of the modulation scheme, an optical receiver may be configured to relatively accurately recover the absolute phase of the optical carrier wave of the received modulated optical signal by applying maximum likelihood sequence estimation processing to each portion of the signal carrying a valid codeword of the FEC code. For example, for a modulation scheme employing a 2n-PSK constellation, the optical receiver may be able to recover the absolute phase of the optical carrier wave with an accuracy that is better than 360/2n degrees.
摘要翻译：光传输系统被配置为使用调制方案，其中施加到编码FEC码的码字的PSK或QAM星座符号的序列的相位旋转产生编码位字的修改的PSK或QAM星座符号序列，不是该FEC码的有效码字。基于调制方案的这种性质，光接收机可以被配置为通过对携带有效码字的信号的每个部分应用最大似然序列估计处理来相对精确地恢复接收的调制光信号的光载波的绝对相位的FEC码。例如，对于采用2n-PSK星座的调制方案，光接收机能够以比360 / 2n度好的精度恢复光载波的绝对相位。

5. 发明授权

US09054926B1 Reception of phase-shifted signal sequences in diversity reception 有权
标题翻译：在分集接收中接收相移信号序列
公开(公告)号：US09054926B1
公开(公告)日：2015-06-09
申请号：US14224996
申请日：2014-03-25
申请人： Galigekere Ramaswamy Dattatreya
发明人： Galigekere Ramaswamy Dattatreya
IPC分类号： H04L27/227 , H04L27/26
CPC分类号： H04L27/2613 , H04B1/713 , H04L1/08 , H04L25/03292 , H04L27/0014 , H04L27/2331 , H04L2027/003 , H04L2027/0067
摘要： During transmission of a signal, a decoder receives a data symbol sequence and one or more copies of the data symbol sequence. The data symbol sequence and each of the copies have unknown noise, including unknown phase shifts. The unknown phase shifts are estimated such that the data symbol sequence that was transmitted is substantially recovered.
摘要翻译：在传输信号期间，解码器接收数据符号序列和数据符号序列的一个或多个拷贝。数据符号序列和每个副本具有未知的噪声，包括未知的相移。估计未知的相移，使得发送的数据符号序列基本恢复。

6. 发明授权

US09049085B2 Method and a device for determining an extrinsic information 有权
标题翻译：用于确定外在信息的方法和装置
公开(公告)号：US09049085B2
公开(公告)日：2015-06-02
申请号：US14009007
申请日：2012-03-05
申请人： Thorben Detert , Mikhail Volyanskiy
发明人： Thorben Detert , Mikhail Volyanskiy
IPC分类号： H03D3/22 , H04L27/20 , H04L25/03 , H04L25/06 , H04L27/233
CPC分类号： H04L27/201 , H04L25/03171 , H04L25/067 , H04L27/2331
摘要： A device for detecting an estimated value for a symbol at a given time, which is supplied to a phase modulation and transmitted via a transmission channel with a time-variable phase, provides a unit for determining log weighting factors in a forward recursion, a unit for determining complex coefficients in a forward recursion, a unit for determining log weighting factors in a backward recursion, a unit for determining complex coefficients in a backward recursion, a unit for determining an extrinsic information, a unit for determining the phase factor with the maximal weighting factor in a forward recursion and a unit for determining the phase factor with the maximal weighting factor in a backward recursion.
摘要翻译：用于检测给定时间的符号的估计值的装置，其被提供给相位调制并且经由具有时变相位的传输信道发送，提供用于确定正向递归中的对数加权因子的单元，单元用于确定正向递归中的复系数，用于确定反向递归中的对数加权因子的单元，用于确定反向递归中的复系数的单元，用于确定外在信息的单元，用于确定具有最大值的相位因子的单元正向递归中的加权因子和用于在向后递归中用最大加权因子确定相位因子的单元。

7. 发明授权

US08937933B2 Method and apparatus for transmitting PLCP frame in wireless local area network system 有权
标题翻译：在无线局域网系统中传输PLCP帧的方法和装置
公开(公告)号：US08937933B2
公开(公告)日：2015-01-20
申请号：US13943572
申请日：2013-07-16
申请人： LG Electronics Inc.
发明人： Dae Won Lee , Dong Wook Roh , Byeong Woo Kang , Yong Ho Seok , Yu Jin Noh , Bong Hoe Kim
IPC分类号： H04W4/00 , H04W84/12 , H04L27/26 , H04L1/00 , H04W28/06
CPC分类号： H04L27/261 , H03M5/12 , H04B7/0413 , H04L1/0041 , H04L1/0061 , H04L25/4904 , H04L27/14 , H04L27/144 , H04L27/148 , H04L27/1563 , H04L27/22 , H04L27/2273 , H04L27/2331 , H04L27/2332 , H04L27/2613 , H04L27/2647 , H04L2027/0028 , H04N5/4401 , H04Q1/46 , H04W28/06 , H04W84/12
摘要： A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field.
摘要翻译：一种在非常高吞吐量（VHT）无线局域网（WLAN）系统中发送物理层汇聚程序（PLCP）帧的方法包括生成要发送到目的站（STA）的MAC协议数据单元（MPDU）通过将包含包含用于传统STA的控制信息的L-SIG字段和包含用于VHT STA的控制信息的VHT-SIG字段的L-SIG字段的PLCP头添加到MPDU来生成PLCP协议数据单元（PPDU），以及发送PPDU 到目的地STA。通过旋转施加到L-SIG字段的OFDM符号的星座来获得应用于VHT-SIG字段的一些正交频分复用（OFDM）符号的星座。

8. 发明授权

US08731029B1 Frequency offset acquisition for wireless communications 有权
标题翻译：无线通信的频偏补偿
公开(公告)号：US08731029B1
公开(公告)日：2014-05-20
申请号：US13004659
申请日：2011-01-11
申请人： Songping Wu , Quan Zhou , Daxiao Yu
发明人： Songping Wu , Quan Zhou , Daxiao Yu
IPC分类号： H04B1/00
CPC分类号： H04B1/707 , H04B1/69 , H04L27/0014 , H04L27/2071 , H04L27/2331 , H04L27/2655 , H04L27/2659 , H04L27/266 , H04L27/2662 , H04L2027/0026
摘要： Systems and techniques relating to wireless communications are described. A described technique includes receiving information that is indicative of a wireless communication signal transmitted by a wireless communication device, the wireless communication signal having been generated based on a spreading sequence and a known preamble; determining, based on the received information and the known preamble, an estimation of a first frequency offset using two or more locations for encoding elements associated with the spreading sequence; determining, based on the received information, the known preamble, and the first frequency offset, an estimation of a second frequency offset using two or more locations for symbols associated with the known preamble, the second frequency offset being different from the first frequency offset; and processing the received information based on a combination of the first frequency offset and the second frequency offset.
摘要翻译：描述与无线通信相关的系统和技术。所描述的技术包括接收指示由无线通信设备发送的无线通信信号的信息，所述无线通信信号已经基于扩展序列和已知前同步码产生; 基于所接收的信息和所述已知前同步骤，使用用于编码与所述扩展序列相关联的元素的两个或多个位置来估计第一频率偏移; 基于所接收的信息，确定所述已知前导码和所述第一频率偏移，使用与所述已知前导码相关联的符号的两个或多个位置的第二频率偏移的估计，所述第二频率偏移不同于所述第一频率偏移; 以及基于所述第一频率偏移和所述第二频率偏移的组合来处理所接收的信息。

9. 发明授权

US08605828B2 Blind mechanism for demodulating offset QPSK signals in the presence of carrier phase error 有权
标题翻译：在存在载波相位误差的情况下解调偏移QPSK信号的盲机制
公开(公告)号：US08605828B2
公开(公告)日：2013-12-10
申请号：US13398936
申请日：2012-02-17
申请人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
发明人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
IPC分类号： H04L27/22 , H04B1/10
CPC分类号： H04L27/2331 , H04L27/0014 , H04L2027/0026 , H04L2027/0057 , H04L2027/0067
摘要： A computer-implemented system and method for blind demodulation of an offset QPSK input signal, involving repeatedly performing a set of operations, including: (a) applying a phase correction to the input signal based on an estimate of a carrier phase offset of the input signal to obtain a first modified signal; (b) shifting a quadrature component of the first modified signal by half a symbol period relative to an inphase component to obtain a second modified signal; (c) extracting a first sequence of symbols from the second modified signal, where the extraction includes estimating a symbol timing offset from the second modified signal; (d) performing hard-decision demodulation on the first sequence of symbols to obtain a second sequence of reference symbols; (e) computing a phase difference between the first sequence of symbols and second sequence of reference symbols; and (f) updating the carrier phase offset estimate using the phase difference.
摘要翻译：一种用于偏移QPSK输入信号的盲解调的计算机实现的系统和方法，包括：重复执行一组操作，包括：（a）基于输入的载波相位偏移的估计对输入信号施加相位校正信号以获得第一修改信号; （b）将第一修改信号的正交分量相对于同相分量移位一半符号周期以获得第二修改信号; （c）从所述第二修改信号中提取第一符号序列，其中所述提取包括估计与所述第二修改信号的符号定时偏移; （d）对所述第一符号序列执行硬判决解调以获得第二参考符号序列; （e）计算第一符号序列与第二参考符号序列之间的相位差; 和（f）使用相位差来更新载波相位偏移估计。

10. 发明申请

US20130216005A1 Blind Mechanism for Demodulating Offset QPSK Signals in the Presence of Carrier Phase Error 有权
标题翻译：在存在载波相位误差的情况下解调偏移QPSK信号的盲机制
公开(公告)号：US20130216005A1
公开(公告)日：2013-08-22
申请号：US13398936
申请日：2012-02-17
申请人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
发明人： Sartaj Chaudhary , Vijaya Yajnanarayana , I Zakir Ahmed
IPC分类号： H04L27/00
CPC分类号： H04L27/2331 , H04L27/0014 , H04L2027/0026 , H04L2027/0057 , H04L2027/0067
摘要： A computer-implemented system and method for blind demodulation of an offset QPSK input signal, involving repeatedly performing a set of operations, including: (a) applying a phase correction to the input signal based on an estimate of a carrier phase offset of the input signal to obtain a first modified signal; (b) shifting a quadrature component of the first modified signal by half a symbol period relative to an inphase component to obtain a second modified signal; (c) extracting a first sequence of symbols from the second modified signal, where the extraction includes estimating a symbol timing offset from the second modified signal; (d) performing hard-decision demodulation on the first sequence of symbols to obtain a second sequence of reference symbols; (e) computing a phase difference between the first sequence of symbols and second sequence of reference symbols; and (f) updating the carrier phase offset estimate using the phase difference.
摘要翻译：一种用于偏移QPSK输入信号的盲解调的计算机实现的系统和方法，包括：重复执行一组操作，包括：（a）基于输入的载波相位偏移的估计对输入信号施加相位校正信号以获得第一修改信号; （b）将第一修改信号的正交分量相对于同相分量移位一半符号周期以获得第二修改信号; （c）从所述第二修改信号中提取第一符号序列，其中所述提取包括估计与所述第二修改信号的符号定时偏移; （d）对所述第一符号序列执行硬判决解调以获得第二参考符号序列; （e）计算第一符号序列与第二参考符号序列之间的相位差; 和（f）使用相位差来更新载波相位偏移估计。

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