Encoder for low-density parity check codes
    93.
    发明授权
    Encoder for low-density parity check codes 有权
    用于低密度奇偶校验码的编码器

    公开(公告)号:US08095859B1

    公开(公告)日:2012-01-10

    申请号:US11971875

    申请日:2008-01-09

    IPC分类号: G06F11/00

    摘要: Encoding of a low-density parity check code uses a block-circulant encoding matrix built from circulant matrices. Encoding can include partitioning data into a plurality of data segments. The data segments are each circularly rotated. A plurality of XOR summations are formed for each rotation of the data segments to produce output symbols. The XOR summations use data from the data segments defined by the circulant matrices. Output symbols are produced in parallel for each rotation of the data segments.

    摘要翻译: 低密度奇偶校验码的编码使用由循环矩阵构建的块循环编码矩阵。 编码可以包括将数据分割成多个数据段。 数据段各自循环旋转。 为数据段的每次旋转形成多个XOR求和以产生输出符号。 XOR求和使用由循环矩阵定义的数据段的数据。 对于数据段的每次旋转,输出符号并行生成。

    Correlation apparatus and method for accommodating spreading code frequency offset
    94.
    发明授权
    Correlation apparatus and method for accommodating spreading code frequency offset 有权
    适应扩展码频偏的相关装置和方法

    公开(公告)号:US08073084B1

    公开(公告)日:2011-12-06

    申请号:US12691578

    申请日:2010-01-21

    IPC分类号: H03D1/00

    CPC分类号: H04B1/7093 H04B1/7075

    摘要: An apparatus and method for correlating a signal over a correlation interval while accommodating spreading code frequency offset is described. In one embodiment, the apparatus includes a plurality of correlators, where each correlator forms a correlation result corresponding to a unique code frequency offset hypothesis. Each correlator selects samples from a tapped delay line at a tap position moved along the delay line at a rate corresponding to the correlator unique code frequency offset hypothesis.

    摘要翻译: 描述了一种用于在适应扩展码频率偏移的同时在相关间隔上相关信号的装置和方法。 在一个实施例中,该装置包括多个相关器,其中每个相关器形成对应于唯一代码频率偏移假设的相关结果。 每个相关器以对应于相关器唯一代码频率偏移假设的速率沿着延迟线移动的抽头位置处的抽头延迟线选择样本。

    Low probability of detection emergency signaling system and method
    96.
    发明授权
    Low probability of detection emergency signaling system and method 有权
    低概率检测应急信号系统及方法

    公开(公告)号:US07944351B1

    公开(公告)日:2011-05-17

    申请号:US12350096

    申请日:2009-01-07

    IPC分类号: G08B1/08

    摘要: An emergency locating system can include emergency transceivers and rescue transceivers. The emergency transceivers can be capable of repeat transmission of a distress message using a variable power level and variable spreading factor. A receive transceiver can be capable of receiving the distress messages and sending a confirmation message to the emergency transceiver. The emergency transceiver can be capable of receiving the confirmation message and terminating transmission of the distress message.

    摘要翻译: 紧急定位系统可以包括应急收发器和救援收发器。 应急收发器能够使用可变功率电平和可变扩频因子重复发送遇险消息。 接收收发器能够接收遇险消息并向紧急收发机发送确认消息。 应急收发器能够接收确认消息并终止遇险消息的传输。

    Compact waveguide load
    97.
    发明授权
    Compact waveguide load 有权
    紧凑型波导负载

    公开(公告)号:US07920034B1

    公开(公告)日:2011-04-05

    申请号:US12964414

    申请日:2010-12-09

    IPC分类号: H01P1/26

    摘要: A compact integrated waveguide load has a load section disposed within an interior region of the waveguide proximate to a closed end of the waveguide. The load section has a tubiform shape, with an exterior surface congruent with an interior surface of the waveguide and an interior surface defining a circumferential step within the waveguide. A method of making a compact integrated waveguide load includes providing a waveguide and placing electromagnetic wave absorbing materially circumferentially around the interior surface to create an inward step.

    摘要翻译: 紧凑的集成波导负载具有设置在靠近波导的封闭端的波导的内部区域内的负载部分。 负载部分具有管状形状,外表面与波导的内表面一致,内表面限定波导内的周向台阶。 制造小型集成波导负载的方法包括提供波导并且将电磁波物理地周向地吸收在内表面周围以产生向内的步骤。

    Memory arbitration technique for turbo decoding
    98.
    发明授权
    Memory arbitration technique for turbo decoding 有权
    用于turbo解码的内存仲裁技术

    公开(公告)号:US07783936B1

    公开(公告)日:2010-08-24

    申请号:US11540134

    申请日:2006-09-28

    IPC分类号: H03M13/03 G11C29/00 G06F11/00

    摘要: A technique for resolving access contention in a parallel turbo decoder is described. The technique includes associating a plurality of buffer memories with the subdecoders so that accesses to banks of a shared interleaver memory can be rescheduled. Accesses can be rescheduled to prevent simultaneous accesses to a single bank of the shared interleaver memory based on an interleaver pattern.

    摘要翻译: 描述了用于解决并行turbo解码器中的访问争用的技术。 该技术包括将多个缓冲存储器与子解码器相关联,使得可以重新调度对共享交织器存储器的存储体的访问。 可以重新调度访问以防止基于交织器模式同时访问共享交织器存储器的单个存储体。

    System and method for asynchronous transmission of communication data to a periodically blanked radar receiver
    99.
    发明授权
    System and method for asynchronous transmission of communication data to a periodically blanked radar receiver 有权
    将通信数据异步传输到周期性消隐雷达接收机的系统和方法

    公开(公告)号:US07453391B1

    公开(公告)日:2008-11-18

    申请号:US11592376

    申请日:2006-11-03

    IPC分类号: G01S13/00

    CPC分类号: G01S7/006

    摘要: A method for asynchronously transmitting bursts of data from a communications terminal to a burst radar transceiver is disclosed. The burst radar can transmit a plurality of bursts, each separated by an inter-burst interval. An inter-burst interval length of the burst radar transceiver can be established. A burst of data at the communications terminal can be formed having a terminal burst interval length less than half the inter-burst interval of the burst radar transceiver. The burst of data can be transmitted a plurality of times from the communications terminal to the burst radar transceiver.

    摘要翻译: 公开了一种从通信终端异步传输数据脉冲串到突发雷达收发信机的方法。 突发雷达可以发送多个突发,每个突发由突发间隔隔开。 可以建立脉冲串雷达收发器的突发间间隔长度。 可以形成通信终端处的数据突发,其具有小于突发雷达收发器的突发间间隔的一半的终端突发间隔长度。 数据突发可以从通信终端多次发送到突发雷达收发信机。

    Adaptive discovery and correction of phase alignment errors in monopulse antenna systems

    公开(公告)号:US10996328B2

    公开(公告)日:2021-05-04

    申请号:US16749594

    申请日:2020-01-22

    IPC分类号: G01S13/68 G01S13/44

    摘要: A mainlobe detection process can include a number of tests that are performed to define when the monopulse antenna system will transition from open loop scanning to closed loop scanning and then to tracking. A hybrid tracking technique is also provided which adaptively discovers and corrects for phase alignment error. Magnitude-only tracking can be performed initially to locate the nulls in the azimuth and elevation ratios and to identify the magnitudes of these ratios at these nulls. Phase tracking can be then performed. During phase tracking, phase corrections can be repeatedly applied to the azimuth and elevation difference channels to correct any phase error that may exist. During this process, the magnitudes of the ratios can be used to determine how the phase corrections should be adjusted. Once the hybrid tracking process is complete, the monopulse antenna system is properly phase-aligned and phase tracking will be correctly employed.