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公开(公告)号：US08199867B2
公开(公告)日：2012-06-12
申请号：US12089642
申请日：2005-10-14
IPC分类号： H04L7/00
CPC分类号： H04L7/043 , H04L7/044 , H04L25/085
摘要： Described is an apparatus for suppressing spurious spectral lines in a frame based bit-serial data stream, in which frames include payload data and frame markers. The apparatus includes means (16) for randomizing first frame marker elements (START) in a first position within each frame and means (18) for correlating second frame marker elements (STOP) in a second position within each frame with the randomized first frame marker element.
摘要翻译： 描述了一种用于抑制基于帧的比特串行数据流中的伪谱线的装置，其中帧包括有效载荷数据和帧标记。 该装置包括用于随机化在每个帧内的第一位置中的第一帧标记元素（START）的装置（16）和用于使每个帧内的第二位置中的第二帧标记元素（STOP）与随机的第一帧标记 元件。
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22.发明授权RF receiver having timing offset recovery function and timing offset recovery method using thereof 有权RF接收机具有定时偏移恢复功能和使用其定时偏移恢复方法公开(公告)号：US08184742B2
公开(公告)日：2012-05-22
申请号：US12137463
申请日：2008-06-11
申请人： U Sang Lee , Jae Hyung Lee , Sang Ho Lee , Kwang Mook Lee
发明人： U Sang Lee , Jae Hyung Lee , Sang Ho Lee , Kwang Mook Lee
CPC分类号： H04L7/043 , H04B1/7075
摘要： A preprocessing unit samples and digitalizes analog signal. A differential operation unit delays digitalized signal for a predetermined period and differentiates delayed signals. A correlation unit correlates differentiated signal with a plurality of predetermined PN code sequences. A setting unit includes a shift register having a plurality of storage locations for shifting the correlation values and sequentially storing shifted correlation values at the storage locations, respectively, a detector including the determination slots for detecting the storage location of the maximum value, and a slot setter for comparing the storage location of the maximum value from the detector with the predetermined reference storage location and shifting the determination slots by the difference therebetween. A demodulation value estimation unit estimates, as a demodulation value of the received analog signal, a symbol of a PN code sequence corresponding to the maximum value from the shifted determination slots.
摘要翻译： 预处理单元对模拟信号进行采样和数字化。 差分操作单元在预定时间段内延迟数字化信号并区分延迟信号。 相关单元将微分信号与多个预定PN码序列相关联。 一个设置单元包括一个移位寄存器，它具有多个存储位置，用于移位相关值，并分别在存储位置依次存储偏移的相关值;检测器，包括用于检测最大值的存储位置的确定时隙; 用于将来自检测器的最大值的存储位置与预定参考存储位置进行比较，并且将确定时隙移位其间的差。 解调值估计单元从所述移位的确定时隙估计与所接收的模拟信号的解调值相对应的最大值的PN码序列的符号。
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公开(公告)号：US20120113270A1
公开(公告)日：2012-05-10
申请号：US12942393
申请日：2010-11-09
CPC分类号： H04L43/08 , H04L7/043 , H04N17/004 , H04R27/00 , H04R2227/003 , H04R2227/005
摘要： Methods, systems, and computer programs for monitoring quality of audio delivered over a communications channel are presented. One method includes an operation for defining timestamps. The timestamps are associated with a measure of time while delivering audio to a client computer, where each timestamp includes a plurality of timestamp bits. Further, the method includes an operation for modulating an audio signal with pseudo noise (PN) codes when a timestamp bit has a first logical value, and modulating the audio signal with a negative of the PN codes when the timestamp bit has a second logical value. After transmitting the modulated audio signal to the client computer, the timestamp bits are extracted from a received modulated audio signal to obtain received timestamps. The quality of the audio is assessed based on the received timestamps, and the quality of the audio is stored in computer memory.
摘要翻译： 提出了用于监测通过通信信道传送的音频质量的方法，系统和计算机程序。 一种方法包括用于定义时间戳的操作。 时间戳与将音频传送到客户端计算机的时间量度相关联，其中每个时间戳包括多个时间戳位。 此外，该方法包括当时间戳位具有第一逻辑值时用伪噪声（PN）码调制音频信号的操作，以及当时间戳位具有第二逻辑值时，用PN码的负值调制音频信号 。 在将调制的音频信号发送到客户端计算机之后，从接收到的调制音频信号中提取时间戳位以获得接收的时间戳。 基于所接收的时间戳来评估音频的质量，音频的质量被存储在计算机存储器中。
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24.发明申请公开(公告)号：US20120027148A1
公开(公告)日：2012-02-02
申请号：US13190909
申请日：2011-07-26
IPC分类号： H04L7/02
CPC分类号： H04L7/042 , G10L19/00 , G10L19/0019 , H04B1/7085 , H04L7/043
摘要： Processing the synchronization of an inband modem to detect sample slip conditions is disclosed. Decision logic reliably detects the sample slip condition while minimizing the number of false alarms.
摘要翻译： 公开了处理带内调制解调器的同步以检测样品滑移条件。 决策逻辑可以可靠地检测样品滑移状态，同时最大限度地减少误报率。
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公开(公告)号：US20110222504A1
公开(公告)日：2011-09-15
申请号：US13114579
申请日：2011-05-24
申请人： Jianglei Ma , Hang Zhang , Wen Tong , Ming Jia , Peiying Zhu , Mo-Han Fong
发明人： Jianglei Ma , Hang Zhang , Wen Tong , Ming Jia , Peiying Zhu , Mo-Han Fong
IPC分类号： H04W72/04
CPC分类号： H04L27/2692 , H04B7/02 , H04B7/0452 , H04L5/0007 , H04L5/0023 , H04L5/0048 , H04L7/043 , H04L27/2613 , H04L27/265 , H04L27/2655 , H04L27/2686 , H04W24/02
摘要： The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of candidate base stations. The base station specific search is then performed in the vicinities of those peaks by using base station specific pseudo-noise sequences. With this two stage cell search, the searching window is drastically reduced. The preamble is matched to known values by a respective receiver to decode the signals and permit multiple signals to be transferred from the transmitter to the receiver. The preamble may comprise two parts, Preamble-I and Preamble-2, which may be used in different systems, including multioutput, multi-input (MIMO) systems.
摘要翻译： 本发明提供插入到OFDMA帧中并具有参与传输的所有基站的公共序列的前同步码。 用户站使用公共前导码上的公共序列执行精细同步，并且所得到的峰值将提供候选基站的位置。 然后通过使用基站专用伪噪声序列，在那些峰附近执行基站专用搜索。 通过这两个阶段的单元格搜索，搜索窗口大大减少。 前导码由相应的接收机与已知值匹配以对信号进行解码，并允许多个信号从发射机传送到接收机。 前导码可以包括两个部分，即前导码1和前导码2，其可以在不同的系统中使用，包括多输入多输入（MIMO）系统。
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公开(公告)号：US07961696B2
公开(公告)日：2011-06-14
申请号：US11630474
申请日：2005-06-23
申请人： Jianglei Ma , Hang Zhang , Wen Tong , Ming Jia , Peiying Zhu , Mo-Han Fong
发明人： Jianglei Ma , Hang Zhang , Wen Tong , Ming Jia , Peiying Zhu , Mo-Han Fong
IPC分类号： H04B7/208
CPC分类号： H04L27/2692 , H04B7/02 , H04B7/0452 , H04L5/0007 , H04L5/0023 , H04L5/0048 , H04L7/043 , H04L27/2613 , H04L27/265 , H04L27/2655 , H04L27/2686 , H04W24/02
摘要： The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of candidate base stations. The base station specific search is then performed in the vicinities of those peaks by using base station specific pseudo-noise sequences. With this two stage cell search, the searching window is drastically reduced. The preamble is matched to known values by a respective receiver to decode the signals and permit multiple signals to be transferred from the transmitter to the receiver. The preamble may comprise two parts, Preamble-1 and Preamble-2, which may be used in different systems, including multioutput, multi-input (MIMO) systems.
摘要翻译： 本发明提供插入到OFDMA帧中并具有参与传输的所有基站的公共序列的前同步码。 用户站使用公共前导码上的公共序列执行精细同步，并且所得到的峰值将提供候选基站的位置。 然后通过使用基站专用伪噪声序列，在那些峰附近执行基站专用搜索。 通过这两个阶段的单元格搜索，搜索窗口大大减少。 前导码由相应的接收机与已知值匹配以对信号进行解码，并允许多个信号从发射机传送到接收机。 前导码可以包括两个部分，即前导码1和前导码2，其可以在不同的系统中使用，包括多输入多输入（MIMO）系统。
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27.发明授权System and method for detecting a presence and frequency offset of a spread spectrum radio frequency signal 有权用于检测扩频射频信号的存在和频率偏移的系统和方法公开(公告)号：US07672415B1
公开(公告)日：2010-03-02
申请号：US11540136
申请日：2006-09-28
IPC分类号： H04L7/00
CPC分类号： H04L7/043
摘要： A system and method for detecting a presence and frequency offset of a spread spectrum radio frequency signal is disclosed. The method comprises receiving the spread spectrum radio signal. The signal can be sampled to form a plurality of signal samples. Each signal sample can be multiplied by a complex conjugate of a proximate signal sample to form a plurality of signal sample pairs. The signal sample pairs can be summed over a predetermined dwell time period to form a data vector having a magnitude and angle offset to enable detection of the signal and to enable a frequency offset between the spread spectrum radio frequency signal and a receiver frequency reference to be determined.
摘要翻译： 公开了一种用于检测扩频射频信号的存在和频率偏移的系统和方法。 该方法包括接收扩频无线电信号。 信号可被采样以形成多个信号采样。 每个信号样本可以乘以邻近信号样本的复共轭以形成多个信号样本对。 信号样本对可以在预定的停留时间周期内相加以形成具有幅度和角度偏移的数据矢量，以使得能够检测信号，并且使得扩频射频信号和接收机频率参考之间的频率偏移能够是 决心。
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28.发明授权Method and apparatus for processing null packets in a digital media receiver 有权用于在数字媒体接收机中处理空分组的方法和装置公开(公告)号：US07652999B2
公开(公告)日：2010-01-26
申请号：US10560480
申请日：2004-06-16
CPC分类号： H04N21/4385 , H04J3/0608 , H04L7/043 , H04L2007/045 , H04N21/2389 , H04N21/4305 , H04N21/4344
摘要： A method and apparatus for reliably detecting MPEG-2 packet sync-byte positions received via a digital transmission system in the event of a packet stream containing a plurality of null packets of a plurality of packets containing a fixed repeating bit pattern and for reliably synchronizing and delivering the MPEG-2 stream broadcast to the receiver transport layer. A Null-Packet Detector compares the content of the current packet with a fixed (or predetermined) bit pattern to detect a null packet to reliably identify the location of the sync-byte of the null packet. a sync-byte position is identified based upon the position of the predetermined fixed bit pattern in the header portion of a plurality of null-packets in the stream.
摘要翻译： 一种在包含包含固定重复位模式的多个分组的多个零分组的分组流的情况下可靠地检测经由数字传输系统接收的MPEG-2分组同步字节位置的方法和装置， 将MPEG-2流广播传送到接收机传输层。 空分组检测器将当前分组的内容与固定（或预定）比特模式进行比较，以检测空分组，以可靠地识别空分组的同步字节的位置。 基于流中的多个空分组的报头部分中的预定固定比特模式的位置来识别同步字节位置。
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29.发明授权Providing global positioning system (GPS) timing signals to remote cellular base stations 有权向远程蜂窝基站提供全球定位系统（GPS）定时信号公开(公告)号：US07558356B2
公开(公告)日：2009-07-07
申请号：US10954864
申请日：2004-09-30
IPC分类号： H04L7/00
摘要： In a cellular network, a GPS receiver includes circuitry that modulates a global positioning system (GPS) timing pulse signal with a carrier signal and transmits the modulated signal to one or more remote base stations. When the modulated timing pulse signal is received at a remote base station it is demodulated and a timing pulse signal corresponding to the GPS timing pulse signal is recovered. The remote base station may be configured to transmit a reply signal back to the GPS receiver, which can then be used to estimate a propagation delay between the GPS receiver and the remote base station.
摘要翻译： 在蜂窝网络中，GPS接收机包括利用载波信号调制全球定位系统（GPS）定时脉冲信号并将调制信号发射到一个或多个远程基站的电路。 当在远程基站接收到调制定时脉冲信号时，其被解调，并且恢复对应于GPS定时脉冲信号的定时脉冲信号。 远程基站可以被配置为将回复信号发送回GPS接收机，然后GPS接收机可用于估计GPS接收机与远程基站之间的传播延迟。
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公开(公告)号：US07486755B2
公开(公告)日：2009-02-03
申请号：US11108924
申请日：2005-04-18
申请人： Lawrence J. Karr
发明人： Lawrence J. Karr
IPC分类号： H04L7/00
摘要： Described is a system and method for providing a synchronization pattern in a communication system. The method includes generating a synchronization pattern with good randomness properties; packing a signal for transmission with m headers, each header consisting of the synchronization pattern 1/m symbol-time shifted from the previous header; and transmitting the signal. A further method provides for the sampling the transmitted signal with m headers of symbol-time shifted synchronization patterns; and determining symbol timing offset by computing and reordering correlation peaks from the synchronization patterns. A system includes a transmitting system, a receiving system, and a data channel. The transmitted signal includes m headers with 1/m symbol-time shifted synchronization patterns. The receiving system undersamples the transmitted signal with m synchronization patterns to simulate an oversampled synchronization pattern.
摘要翻译： 描述了一种用于在通信系统中提供同步模式的系统和方法。 该方法包括产生具有良好随机性的同步模式; 打包一个用于传送m个报头的信号，每个报头由从前一报头移位的符号时间同步模式1 / m组成; 并发送信号。 另一种方法提供用符号时间偏移同步模式的m个头部对发射信号进行采样; 以及通过从所述同步模式计算和重新排序相关峰来确定符号定时偏移。 系统包括发射系统，接收系统和数据信道。 发送信号包括具有1 / m符号时间偏移同步模式的m个报头。 接收系统对m个同步模式的发射信号进行了下采样，以模拟过采样同步模式。
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