Parallel DSP demodulation for wideband software-defined radios
    1.
    发明申请
    Parallel DSP demodulation for wideband software-defined radios 有权
    用于宽带软件定义无线电的并行DSP解调

    公开(公告)号:US20050286619A1

    公开(公告)日:2005-12-29

    申请号:US10878902

    申请日:2004-06-28

    IPC分类号: H04B1/28 H04B1/38

    摘要: A demodulator, suitable for use in a communication system and in a modem, has a block polyphase circuit with circuit blocks for different signal processing functions, particularly filtering, delay, and frequency conversion. The circuit blocks are arranged for parallel processing of different portions of an input sequence of signals. Signals of the input sequence to be filtered are divided among the blocks by a demultiplexer for processing at a clock frequency lower than a clock frequency of the input signal sequence. Signals outputted by groups of the circuit blocks are summed to produce an output signal of the group. Frequency and timing reference signals, as well as fractional delay interpolation, are produced also by parallel-channel circuitry. Output signals of all of the groups are multiplexed to provide an output signal sequence such that the repetition frequency of the outputted signals may be higher, lower, or equal to that of the input signal sequence. This enables use of programmable circuitry operative at clock rates lower than rates required to process directly the input signal sequence.

    摘要翻译: 适用于通信系统和调制解调器的解调器具有块多相电路,具有用于不同信号处理功能的电路块,特别是滤波,延迟和频率转换。 电路块被布置用于对输入信号序列的不同部分进行并行处理。 要被滤波的输入序列的信号由解复用器在块之间划分,以在低于输入信号序列的时钟频率的时钟频率处理。 将由电路块的组输出的信号相加以产生该组的输出信号。 频率和定时参考信号以及分数延迟插值也由并行通道电路产生。 所有组的输出信号被复用以提供输出信号序列,使得输出信号的重复频率可以高于,低于或等于输入信号序列的重复频率。 这使得可以使用以低于直接处理输入信号序列所需的速率的时钟速率工作的可编程电路。

    Parallel filter realization for wideband programmable digital radios
    2.
    发明申请
    Parallel filter realization for wideband programmable digital radios 有权
    宽带可编程数字无线电并行滤波器实现

    公开(公告)号:US20060031274A1

    公开(公告)日:2006-02-09

    申请号:US10914554

    申请日:2004-08-09

    IPC分类号: G06F17/10

    摘要: A block polyphase filter is constructed of a set of filter blocks having different filter functions, and being arranged for parallel processing of portions of an input sequence of signals. Signals of the input sequence are divided among the blocks by a demultiplexer for processing at a clock frequency lower than a clock frequency of the input signal sequence. The filter blocks are arranged in groups, wherein output signals of the blocks in any one group are summed to produce an output signal of the filtered group. Output signals of all of the filter groups are multiplexed to provide an output signal sequence wherein the repetition frequency of the signals may be higher, lower, or equal to the repetition frequency of the input signal sequence depending upon the ratio of the number of filter groups to the number of filter blocks in the set of filter blocks.

    摘要翻译: 块多相滤波器由具有不同滤波器功能的一组滤波器块构成,并被布置用于并行处理输入信号序列的部分。 输入序列的信号由解复用器在块之间分割,以便在低于输入信号序列的时钟频率的时钟频率处理。 滤波器块被分组布置,其中将任一组中的块的输出信号相加以产生滤波组的输出信号。 所有滤波器组的输出信号被复用以提供输出信号序列,其中信号的重复频率可以更高,更低或等于输入信号序列的重复频率,这取决于滤波器组的数量 到滤波器块集合中的滤波器块的数量。

    Method and system for systematically diagnosing data problems in a database

    公开(公告)号:US06993518B2

    公开(公告)日:2006-01-31

    申请号:US09864719

    申请日:2001-05-24

    IPC分类号: G06F17/30

    摘要: A method and system for diagnosing data problems in a database. The system provides a test program for running simultaneously a series of tests on the database. In the test program, a set of queries corresponding to the series of tests are defined. Then these queries are refined as fields of a larger query, such that the test results appear merely as small tables. This technique can be implemented using SQL commands “WITH” and “LEFT OUTER JOIN.” The test program is configured to display automatically all the results from the tests in one table. By simply running the test program and viewing the table showing all the test results, an operator is able to diagnose easily the nature and location of the data problem(s) in the database.

    Acquisition of a synchronous CDMA TDD QPSK waveform using power and timing estimates
    6.
    发明授权
    Acquisition of a synchronous CDMA TDD QPSK waveform using power and timing estimates 有权
    使用功率和定时估计获取同步CDMA TDD QPSK波形

    公开(公告)号:US07272124B1

    公开(公告)日:2007-09-18

    申请号:US10284536

    申请日:2002-10-30

    IPC分类号: H04B7/216

    摘要: A method and system for using power and timing estimates to acquire frame acquisition of a reverse CDMA carrier signal. The method includes providing at least one remote transceiver device acquiring a forward CDMA carrier signal, and the one remote transceiver device transmitting a reverse CDMA carrier signal modified to include a frequency associated with the forward CDMA carrier signal. A transceiver base station, in response to determining if the reverse CDMA carrier signal exceeds a reverse CDMA carrier signal threshold (RCCST), uses the frequency embedded in the modified reverse CDMA carrier signal to acquire phase of the reverse CDMA carrier signal. Achieving acquisition the transceiver base station signals a mode change to the remote transceiver. Otherwise, the transceiver base station signals the remote transceiver device to slip the reverse CDMA carrier signal a predetermined number of chips; and/or transmit the reverse CDMA carrier signal at a second power level.

    摘要翻译: 一种使用功率和定时估计来获取反向CDMA载波信号的帧获取的方法和系统。 该方法包括提供至少一个远程收发器设备获取前向CDMA载波信号,并且一个远程收发器设备发送被修改为包括与前向CDMA载波信号相关联的频率的反向CDMA载波信号。 收发机基站响应于确定反向CDMA载波信号是否超过反向CDMA载波信号阈值(RCCST),使用嵌入在修改的反向CDMA载波信号中的频率来获取反向CDMA载波信号的相位。 实现采集收发基站向远程收发信机发送模式更改。 否则,收发机基站向远程收发器装置发信号通知反向CDMA载波信号预定数量的芯片; 和/或以第二功率电平发送反向CDMA载波信号。

    Circular fixed wing VTOL aircraft
    7.
    发明申请
    Circular fixed wing VTOL aircraft 有权
    圆形固定翼垂直起降飞机

    公开(公告)号:US20050205715A1

    公开(公告)日:2005-09-22

    申请号:US10422577

    申请日:2003-04-25

    申请人: Brad Hansen

    发明人: Brad Hansen

    摘要: A VTOL aircraft includes a wing, a propulsion system, and an air dam. The propulsion system is located in a central void formed in the wing to cause air flow from an outer perimeter of the wing over the wing and down through the void to generate lift. The air dam is located over the central void to promote flow of air over the wing. The aircraft also may utilize sub-atmospheric pressure gas to reduce the relative weight of the aircraft.

    摘要翻译: 垂直起降飞机包括机翼,推进系统和空气坝。 推进系统位于机翼中形成的中心空隙中,以使空气从机翼的外围流过机翼并向下通过空隙以产生升力。 空气坝位于中心空间之上,以促进空气流过机翼。 飞机还可以利用次大气压气体来减小飞机的相对重量。