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    • 1. 发明申请
    • Method, apparatus and computer program for estimating spectrum using a folding ADC
    • 使用折叠ADC估计频谱的方法,装置和计算机程序
    • US20100029210A1
    • 2010-02-04
    • US12148859
    • 2008-04-22
    • Mikko KaltiokallioSaska LindforsJussi Ryynanen
    • Mikko KaltiokallioSaska LindforsJussi Ryynanen
    • H04B17/00G05B23/00
    • H03J1/0091
    • To find frequency slots over which a 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 to 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.
    • 为了找到认知无线电可以在其上发送机会性传输的频率时隙,以较低的分辨率搜索宽带频谱以识别具有低信号级别或没有信号级别的带宽片段。 用更高分辨率的候选频率片段搜索所识别的带宽片,作为在更高分辨率搜索之后具有最小信号电平的那些带宽片,并且从最低信号电平到最高排列。 在所选择的候选频率片上以等级的顺序执行频谱检测算法,直到确定其中的一个具有足够的自由频谱。 然后在所确定的候选频率片上机会地发送传输。 进行搜索时,检测到间歇信号,并以较低的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片。 显示了如何进行精细搜索的各种技术。