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51. 发明申请

US20130010882A1 TRANSMITTING APPARATUS AND METHOD FOR A DIGITAL TELECOMMUNICATION SYSTEM 审中-公开
公开(公告)号：US20130010882A1
公开(公告)日：2013-01-10
申请号：US13618613
申请日：2012-09-14
申请人： Ralf BÖHNKE , Thomas DÖLLE , Tino PUCH
发明人： Ralf BÖHNKE , Thomas DÖLLE , Tino PUCH
IPC分类号： H04L7/08
CPC分类号： H04L27/2663 , H04B1/16 , H04L7/042
摘要： A transmitting apparatus transmits signals in a digital telecommunication system and a synchronising method is used for synchronizing such signals at a receiving apparatus. The transmitting apparatus prepares for transmission of a reference symbol having at least two repetition patterns, whereby one of the at least two repetition patterns is phase-shifted in relation to the other repetition pattern, and a synchronizing mechanism in the digital telecommunication system uses the reference symbol once received for synchronization. The synchronizing mechanism uses a cross-correlation mechanism to cross-correlate at least one of the two repetition patterns within a correlation window having a predetermined length.

52. 发明申请

US20120314820A1 High-Performance Orthogonal Frequency Division Multiplexing Receiver 审中-公开
标题翻译：高性能正交频分复用接收机
公开(公告)号：US20120314820A1
公开(公告)日：2012-12-13
申请号：US13488839
申请日：2012-06-05
申请人： Chunmei KANG , Elliot Sheldon Briggs , Amitkumar Mane , Brian Steven Nutter , Daniel Perrine McLane
发明人： Chunmei KANG , Elliot Sheldon Briggs , Amitkumar Mane , Brian Steven Nutter , Daniel Perrine McLane
IPC分类号： H04L25/08 , H04L27/06
CPC分类号： H04L27/266 , H04L27/2663 , H04L27/2671 , H04L27/2691
摘要： Devices, methods, and systems for an orthogonal frequency division multiplexing (OFDM) receiver comprising a processor configured to execute a maximum likelihood timing estimator for OFDM symbol timing, a resampling filter for sampling clock frequency offset correcting via a loop filter, where the loop filter may be configured to receive a symbol timing loop error and provide, via a delay accumulator input signals to the resampling filter, and where the resampling filter may be configured to output a resampled signal for demodulating.
摘要翻译：一种用于正交频分复用（OFDM）接收机的装置，方法和系统，包括被配置为执行用于OFDM符号定时的最大似然定时估计器的处理器，用于经由环路滤波器对时钟频率偏移校正进行采样的重采样滤波器，其中环路滤波器可以被配置为接收符号定时环路错误，并且经由延迟累加器将输入信号提供给重采样滤波器，并且其中重采样滤波器可以被配置为输出用于解调的重采样信号。

53. 发明申请

US20120294233A1 Long-Range Nodes with Adaptive Preambles for Coexistence 有权
标题翻译：具有自适应前缀的长程节点用于共存
公开(公告)号：US20120294233A1
公开(公告)日：2012-11-22
申请号：US13111970
申请日：2011-05-20
申请人： Bozidar Radunovic , Ranveer Chandra , Dinan Srilal Gunawardena
发明人： Bozidar Radunovic , Ranveer Chandra , Dinan Srilal Gunawardena
IPC分类号： H04W4/00
CPC分类号： H04L27/0006 , H04L1/0038 , H04L5/0032 , H04L5/0051 , H04L5/0062 , H04L25/0226 , H04L27/2613 , H04L27/2656 , H04L27/2663 , H04L27/2665 , H04L27/2691 , H04L27/2694
摘要： Wireless protocols in the unlicensed spectrum are developed for different requirements in terms of transmit range and power, which makes it difficult for multiple nodes having disparate transmit ranges to coexist in the same unlicensed spectrum. A short-range wireless node uses adaptive preambles to signal presence to long-range wireless nodes outside of its transmit range. In addition, a long-range wireless node detects an adapter preamble and backs-off transmissions for reservation period dedicated to short-range nodes.
摘要翻译：针对发射范围和功率方面的不同要求开发了无许可频谱中的无线协议，这使得具有不同发射范围的多个节点难以在相同的未许可频谱中共存。短距离无线节点使用自适应前导码来将信号发送到其发射范围之外的远程无线节点。此外，远程无线节点检测用于短距离节点专用的预留时段的适配器前导码和后退传输。

54. 发明申请

US20120281792A1 METHOD AND SYSTEM FOR GENERATING TIMED EVENTS IN A RADIO FRAME IN AN E-UTRA/LTE UE RECEIVER 有权
标题翻译：用于在E-UTRA / LTE UE接收机的无线帧中生成定时事件的方法和系统
公开(公告)号：US20120281792A1
公开(公告)日：2012-11-08
申请号：US13480807
申请日：2012-05-25
申请人： Francis SWARTS , Mark Kent
发明人： Francis SWARTS , Mark Kent
IPC分类号： H04W56/00
CPC分类号： H04J11/0069 , H04L27/2663 , H04L27/2671
摘要： A mobile device coupled to a common system clock receives a signal comprising a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS) in a radio frame. Sample counts are generated for timed events based on corresponding operating bandwidths. The timed events are detected at modulo sample counts of the generated sample counts according to corresponding operating bandwidths. PSS symbol timing determined via the PSS synchronization is aligned to the generated sample counts based on corresponding operating bandwidth. The generated sample counts are bit-shifted relative to the aligned PSS symbol timing for other timed events based on corresponding operating bandwidths. The one or more timed events are determined via performing modulo counting after the bit-shifting. Timing operations are performed at the determined timed events and the determined one or more timed events are refined, accordingly.
摘要翻译：耦合到公共系统时钟的移动设备在无线电帧中接收包括主同步序列（PSS）和辅同步序列（SSS）的信号。基于相应的工作带宽为定时事件生成采样计数。根据相应的工作带宽，以生成的采样计数的模样本计数来检测定时事件。通过PSS同步确定的PSS符号定时与基于相应的工作带宽的生成的采样计数相对准。基于对应的工作带宽，生成的采样计数相对于其他定时事件的对准PSS符号定时进行位移。一个或多个定时事件通过在位移之后执行模计数来确定。相应地，在确定的定时事件执行定时操作，并且确定所确定的一个或多个定时事件被改进。

55. 发明申请

US20120243626A1 SYSTEM ACCESS AND SYNCHRONIZATION METHODS FOR MIMO OFDM COMMUNICATIONS SYSTEMS AND PHYSICAL LAYER PACKET AND PREAMBLE DESIGN 有权
公开(公告)号：US20120243626A1
公开(公告)日：2012-09-27
申请号：US13487898
申请日：2012-06-04
申请人： Jianglei MA , Ming JIA , Peiying ZHU , Wen TONG
发明人： Jianglei MA , Ming JIA , Peiying ZHU , Wen TONG
IPC分类号： H04L7/08 , H04L27/28 , H04W56/00 , H04L27/06
CPC分类号： H04W36/08 , H04B7/022 , H04B7/04 , H04B7/0413 , H04B7/0667 , H04B7/0697 , H04J11/0069 , H04L5/0023 , H04L5/0037 , H04L5/0048 , H04L7/0008 , H04L27/2602 , H04L27/2607 , H04L27/2613 , H04L27/2627 , H04L27/2628 , H04L27/2663 , H04L27/2665 , H04L27/2672 , H04L27/2675
摘要： A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.

56. 发明授权

US08189541B2 Method and system for generating timed events in a radio frame in an E-UTRA/LTE UE receiver 有权
标题翻译：用于在E-UTRA / LTE UE接收机的无线帧中生成定时事件的方法和系统
公开(公告)号：US08189541B2
公开(公告)日：2012-05-29
申请号：US12502196
申请日：2009-07-13
申请人： Francis Swarts , Mark Kent
发明人： Francis Swarts , Mark Kent
IPC分类号： H04J3/06
CPC分类号： H04J11/0069 , H04L27/2663 , H04L27/2671
摘要： A mobile device coupled to a common system clock receives a signal comprising a primary synchronization sequence (PSS) and a secondary synchronization sequence (SSS) in a radio frame. Sample counts are generated for timed events based on corresponding operating bandwidths. The timed events are detected at modulo sample counts of the generated sample counts according to corresponding operating bandwidths. PSS symbol timing determined via the PSS synchronization is aligned to the generated sample counts based on corresponding operating bandwidth. The generated sample counts are bit-shifted relative to the aligned PSS symbol timing for other timed events based on corresponding operating bandwidths. The one or more timed events are determined via performing modulo counting after the bit-shifting. Timing operations are performed at the determined timed events and the determined one or more timed events are refined, accordingly.
摘要翻译：耦合到公共系统时钟的移动设备在无线电帧中接收包括主同步序列（PSS）和辅同步序列（SSS）的信号。基于相应的工作带宽为定时事件生成采样计数。根据相应的工作带宽，以生成的采样计数的模样本计数来检测定时事件。通过PSS同步确定的PSS符号定时与基于相应的工作带宽的生成的采样计数相对准。基于对应的工作带宽，生成的采样计数相对于其他定时事件的对准PSS符号定时进行位移。一个或多个定时事件通过在位移之后执行模计数来确定。相应地，在确定的定时事件执行定时操作，并且确定所确定的一个或多个定时事件被改进。

57. 发明授权

US08144683B1 High throughput fine timing 有权
标题翻译：高通量精准时机
公开(公告)号：US08144683B1
公开(公告)日：2012-03-27
申请号：US11947746
申请日：2007-11-29
申请人： Qinfang Sun , Kai Shi
发明人： Qinfang Sun , Kai Shi
IPC分类号： H04J3/24
CPC分类号： H04L27/2602 , H04L25/0202 , H04L27/2663 , H04L27/2665 , H04L27/2675 , H04L27/2695
摘要： After detecting the predetermined phase rotation, a receiver can advantageously remove any cyclic shifting delays (CSDs) from the mixed mode packet for each chain. Once any CSDs are removed, the receiver can perform timing offset estimation and decode the mixed mode packet. In another embodiment, a timing offset from a channel for a first chain without any CSDs can be estimated. Compensation for the timing offset in the first chain can then be performed. At this point, the CSDs from other chains can then be removed. After CSD removal, compensation for any timing offsets in the other chains can be performed using the timing offset in the first chain.
摘要翻译：在检测到预定的相位旋转之后，接收机可以有利地从每个链路的混合模式分组中去除任何循环移位延迟（CSD）。一旦任何CSD被去除，接收机可以执行定时偏移估计和解码混合模式分组。在另一个实施例中，可以估计来自没有任何CSD的第一链的信道的定时偏移。然后可以执行第一链中的定时偏移的补偿。在这一点上，可以将其他链的CSD移除。在CSD去除之后，可以使用第一链中的定时偏移来执行其他链中的任何定时偏移的补偿。

58. 发明申请

US20120051472A1 CORRELATOR AND DEMODULATION DEVICE INCLUDING CORRELATOR 有权
标题翻译：包括相关器的相关器和解调器件
公开(公告)号：US20120051472A1
公开(公告)日：2012-03-01
申请号：US13211896
申请日：2011-08-17
申请人： Hiroji AKAHORI
发明人： Hiroji AKAHORI
IPC分类号： H04L27/06
CPC分类号： H04L27/2663 , H04L27/2691
摘要： The present invention provides a correlator and a demodulation device including, first and second filter sections having different non-overlapping pass-frequency characteristics, first and second delay circuits that delay the signals output from the first and second filter section by one effective OFDM symbol period, first and second complex conjugate circuits that take the complex conjugates of the delayed signals, first and second complex operation sections that compute the complex-multiplies of the signals from the first and second filter sections and the respective signals for the first and second complex conjugate circuits, first and second moving average processing sections that take moving averages of GI lengths, proportion determination circuit that compares the maximum values of the autocorrelations from each of the first and second moving average processing circuits, and selection-combination circuit that selects the autocorrelation having the largest maximum value based on the comparison result.
摘要翻译：本发明提供一种相关器和解调装置，包括具有不同非重叠通过频率特性的第一和第二滤波器部分，第一和第二延迟电路，其将从第一和第二滤波器部分输出的信号延迟一个有效的OFDM符号周期获取延迟信号的复共轭的第一和第二复共轭电路，计算来自第一和第二滤波器部分的信号的复数乘法的第一和第二复数运算部分以及第一和第二复共轭的相应信号电路，采取GI长度的移动平均值的第一和第二移动平均处理部分，比较从第一和第二移动平均处理电路中的每一个的自相关的最大值的比例确定电路，以及选择自相关的选择组合电路，基于t的最大最大值他比较结果。

59. 发明申请

US20120045004A1 CORRELATOR AND DEMODULATION DEVICE INCLUDING THE CORRELATOR 有权
标题翻译：包括相关器的相关器和解调器件
公开(公告)号：US20120045004A1
公开(公告)日：2012-02-23
申请号：US13210099
申请日：2011-08-15
申请人： Hiroji AKAHORI
发明人： Hiroji AKAHORI
IPC分类号： H04K1/10 , H04L27/06
CPC分类号： H04L27/2663 , H04L27/2671 , H04L27/2678 , H04L27/2688
摘要： The Present invention provides a correlator including, a read-out processing circuit that reads out an OFDM signal in RAM as 2n−1 number of delay OFDM signals that are increased and delayed sequentially with their adjusted read-out timings. Complex conjugate circuits that outputs complex conjugates of the inputted nth to 2n−1th delay OFDM signals. Complex arithmetic circuits that perform complex multiplication to inputted original OFDM signal, the first to n−1th delay OFDM signals, and the output signals from the complex conjugate circuits. Moving average processing circuits take the moving average of the GI length, gain adjustment circuits adjust the gains, an adder circuit adds the outputs of the adjustment circuits, and a filter circuit smoothes the addition result. A control circuit variably controls the delay of the delay OFDM signals, the gains of the gain adjustment circuits, and the band characteristic of the filter circuit.
摘要翻译：本发明提供了一种相关器，其包括：读出处理电路，其读出RAM中的OFDM信号，作为2n-1个延迟OFDM信号，并按其调整后的读出时序顺序增加和延迟。输出第n至第2n延迟OFDM信号的复共轭的复共轭电路。对输入的原始OFDM信号执行复数乘法的复数运算电路，第一至第n延迟OFDM信号和来自复共轭电路的输出信号。移动平均处理电路采用GI长度的移动平均值，增益调整电路调整增益，加法器电路将调整电路的输出相加，滤波器电路平滑相加结果。控制电路可变地控制延迟OFDM信号的延迟，增益调整电路的增益以及滤波器电路的频带特性。

60. 发明申请

US20120027419A1 FRAME/SYMBOL SYNCHRONIZATION IN COHERENT OPTICAL OFDM 有权
标题翻译：相邻光学OFDM中的帧/符号同步
公开(公告)号：US20120027419A1
公开(公告)日：2012-02-02
申请号：US13194347
申请日：2011-07-29
申请人： Noriaki Kaneda , Timo Pfau , Qi Yang
发明人： Noriaki Kaneda , Timo Pfau , Qi Yang
IPC分类号： H04B10/00 , H04L27/06 , H04L27/00 , H04B10/06 , H04B10/04
CPC分类号： H04L27/223 , H04B10/516 , H04B10/60 , H04L27/2657 , H04L27/2663 , H04L27/2671 , H04L27/2675 , H04L27/2684 , H04L27/2692
摘要： One aspect provides an optical communication system. The system includes an optical-to-digital converter, a frequency estimator and a symbol synchronizer. The optical-to-digital converter is configured to receive an optical OFDM bit stream including an OFDM symbol bearing payload data and a symbol header preceding the OFDM payload data. The frequency estimator is configured to determine a carrier frequency offset of the payload data from the symbol header. The symbol synchronizer is configured to determine a starting location of the payload data within the bit stream by cross-correlating a synchronization pattern within the symbol header with a model synchronization pattern stored by the symbol synchronizer.
摘要翻译：一个方面提供一种光通信系统。该系统包括光数字转换器，频率估计器和符号同步器。光数字转换器被配置为接收包括在OFDM有效载荷数据之前带有有效载荷数据和符号标题的OFDM符号的光OFDM位流。频率估计器被配置为确定来自符号头部的有效载荷数据的载波频率偏移。符号同步器被配置为通过将符号头部内的同步模式与由符号同步器存储的模型同步模式相互相关来确定位流内的有效载荷数据的起始位置。

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