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531 条记录 (耗时 0.021 秒)

    METHOD, APPARATUS AND COMPUTER PROGRAM FOR ESTIMATING SPECTRUM USING A FOLDING ADC
    37.
    发明公开
    METHOD, APPARATUS AND COMPUTER PROGRAM FOR ESTIMATING SPECTRUM USING A FOLDING ADC 审中-公开
    用于使用折叠ADC估计谱的方法，设备和计算机程序

    公开(公告)号：EP2269315A1

    公开(公告)日：2011-01-05

    申请号：EP09733785.1

    申请日：2009-04-08

    申请人： Nokia Corporation

    发明人： KALTIOKALLIO, Mikko ,  LINDFORS, Saska ,  RYYNÄNEN, Jussi

    IPC分类号： H04B1/00 ,  G01R23/00 ,  G01R23/16 ,  G01R23/167 ,  G06F17/14

    CPC分类号： H03J1/0091

    摘要： To find frequency slots over which cognitive radio can send an opportunistic transmission, a wideband spectrum is searched with a lower resolution to identify bandwidth slices having low or no signal levels. The identified bandwidth slices are searched with a higher resolution. Candidate frequency slices are selected as those bandwidth slices having least signal levels after the higher resolution searching, and ranked from lowest signal level to highest. A spectrum detection algorithm is executed on the selected candidate frequency slices in the order of the rank until it is decided that one of them has sufficiently free spectrum. A transmission is then opportunistically sent on the decided candidate frequency slice. Ongoing the searching, intermittent signals are detected and a band about them is searched with the lower resolution to determine if the band about the detected intermittent signal is an identified bandwidth slice. Various techniques are shown for how the fine search is conducted.

    摘要翻译： 为了找到认知无线电可以发送机会传输的频隙，以较低分辨率搜索宽带频谱以识别具有低信号电平或无信号电平的带宽分片。 所识别的带宽切片以更高的分辨率进行搜索。 候选频率片被选择为在较高分辨率搜索之后具有最小信号电平并且从最低信号级到最高级的那些带宽片。 频谱检测算法在选择的候选频率片上按照秩的顺序执行，直到确定它们中的一个具有足够自由的频谱。 然后在确定的候选频率片上机会性地发送传输。 在搜索过程中，检测间歇信号，以较低分辨率搜索关于它们的频带，以确定关于检测到的间歇信号的频带是否是识别的带宽分片。 显示了如何进行精细搜索的各种技术。

    SIGNAL QUALITY MEASURING DEVICE, SPECTRUM MEASURING CIRCUIT, AND PROGRAM
    38.
    发明公开
    SIGNAL QUALITY MEASURING DEVICE, SPECTRUM MEASURING CIRCUIT, AND PROGRAM 审中-公开
    SIGNALQUALITÄTS-MESSEINRICHTUNG，SPEKTRUM-MESSSCHALTUNG UND PROGRAMM

    公开(公告)号：EP2103948A1

    公开(公告)日：2009-09-23

    申请号：EP07850815.7

    申请日：2007-12-18

    申请人： NEC Corporation

    发明人： NOSE, Koichi ,  MIZUNO, Masayuki

    IPC分类号： G01R19/00 ,  G01R23/16

    CPC分类号： H04B17/318 ,  G01R23/16 ,  H04B17/15

    摘要： In the signal quality measurement device of the present invention, a spectrum measurement circuit (101) includes: an N-(where N is an integer equal or greater than 2) phase clock generation circuit (304) for supplying phase-modulated signals in which the phase of a clock signal is shifted by a phase modulation amount each time the settings of the phase modulation amount are switched; a mixer circuit (303) for taking the product of a measured signal that is supplied from a transmitter and the phase-modulated signals that are supplied from the N-phase clock generation circuit (304); an average value output circuit (305) for supplying an average voltage value of the output signal of the mixer circuit (303); a memory (307) for storing the average voltage value supplied from the average value output circuit (305) for each phase modulation amount of the N-phase clock generation circuit (304); and arithmetic unit (308) for using the average voltage value for each phase modulation amount of the N-phase clock generation circuit (304) that is stored in memory (307) to calculate the signal strength of the measured signal.

    摘要翻译： 在本发明的信号质量测量装置中，频谱测量电路（101）包括：N（其中N是等于或大于2的整数）相位时钟产生电路（304），用于提供相位调制信号，其中 每当切换相位调制量的设定时，时钟信号的相位偏移相位调制量; 用于获取从发送器提供的测量信号和从N相时钟产生电路（304）提供的相位调制信号的乘积的混频器电路（303）; 平均值输出电路（305），用于提供混频电路（303）的输出信号的平均电压值; 存储从所述平均值输出电路（305）提供的平均电压值用于所述N相时钟发生电路（304）的每个相位调制量的存储器（307）。 和运算单元（308），用于对存储在存储器（307）中的N相时钟产生电路（304）的每个相位调制量的平均电压值进行计算，以计算测量信号的信号强度。

    Time arbitrary signal power statistics measurement device and methods
    39.
    发明公开
    Time arbitrary signal power statistics measurement device and methods 审中-公开
    装置和方法，用于测量时间的任意的信号功率统计

    公开(公告)号：EP1783500A3

    公开(公告)日：2009-07-22

    申请号：EP06255652.7

    申请日：2006-11-02

    申请人： TEKTRONIX, INC.

    发明人： Bernard, Kyle L.

    IPC分类号： G01R23/16

    CPC分类号： G01R23/16

    摘要： A measurement instrument is provided with an FFT module providing a frequency domain output; and a power calculator connected to the frequency domain output to measure power statistics for a test signal of arbitrary length. In some embodiments, a spectrum integration module is provided to calculate the power contained within a frequency band. In an embodiment, a filter/averaging module is provided to compute signal power statistics over an arbitrary time period. Accumulators may be provided to store data related to maximum power, minimum power, average power, or peak to average power. A CCDF module may be provided in some embodiments to calculate CCDF related measurements. Also provided are methods of making power statistic measurements.

    Methods and systems for determining a received signal frequency
    40.
    发明公开
    Methods and systems for determining a received signal frequency 审中-公开
    Verfahren und Systeme zum Bestimmen einer empfangenen Signalfrequenz

    公开(公告)号：EP2073027A1

    公开(公告)日：2009-06-24

    申请号：EP08171108.7

    申请日：2008-12-09

    申请人： Honeywell International Inc.

    发明人： Gibson, Timothy Honeywell International Inc. ,  Hunter, Jeffrey Kent Honeywell International Inc.

    IPC分类号： G01R23/16

    CPC分类号： G01R23/02 ,  G01S13/785

    摘要： A system and method for determining a received signal frequency by sampling the received signal at a rate less than the nyquist rate. The system includes a distorting component configured to distort the received signal in a frequency dependent manner, at least one analog to digital converter configured to sample the received signal and the distorted signal at a rate less than the nyquist rate, and a processing component configured to determine a frequency of the received signal based on the sampled received signal and the sampled distorted signal. The method includes distorting the received signal, sampling the received signal and the distorted signal at a rate less than the nyquist rate, and determining a frequency of the received signal. In an embodiment, distorting includes at least one of distorting an amplitude or a group delay of the received signal.

    摘要翻译： 一种用于通过以小于尼奎斯特速率的速率对接收到的信号进行采样来确定接收信号频率的系统和方法。 该系统包括被配置为以频率相关的方式使接收到的信号失真的失真部件，至少一个模/数转换器被配置成以小于奈奎斯特速率的速率对接收到的信号和失真信号进行采样，并且处理部件被配置为 基于采样的接收信号和采样的失真信号确定接收信号的频率。 该方法包括使接收到的信号失真，以小于奈奎斯特速率的速率采样接收信号和失真信号，以及确定接收信号的频率。 在一个实施例中，失真包括使接收信号的振幅或组延迟失真中的至少一个。