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    • 2. 发明申请
    • DYNAMIC FREQUENCY SELECTION IN A COGNITIVE RADIO SYSTEM
    • 认知无线电系统中的动态频率选择
    • WO2010088586A3
    • 2010-09-23
    • PCT/US2010022704
    • 2010-02-01
    • QUALCOMM INCSADEK AHMED KGOROKHOV ALEXEI YSHELLHAMMER STEPHEN J
    • SADEK AHMED KGOROKHOV ALEXEI YSHELLHAMMER STEPHEN J
    • H04W16/14H04W72/08
    • H04W72/082H04W16/14H04W72/0406
    • Multichannel dynamic frequency selection in wireless networks (10, 20) begins with an access point (90, 100, 200) for a wireless network broadcasting a list of unused channels (300, 905) that are available for communication within the area served by the access point. The various access terminals (80, 101, 201) within this service area receive the broadcast and measure (401) various interference characteristics of each of the channels in the list. The access terminals then send (402) this interference information (301, 505) to the access point, which compiles a matrix of interference information (906) that is associated with the quality of each signal as related to each access terminal. Using this information, the access point selects (302, 702) the appropriate channels to serve the most number of access terminals at the highest possible channel qualities.
    • 无线网络(10,20)中的多信道动态频率选择从无线网络的接入点(90,100,200)开始,所述无线网络广播无用信道列表(300,905),所述未使用信道可用于在由 切入点。 该服务区域内的各种接入终端(80,101,201)接收广播并测量(401)列表中每个频道的各种干扰特性。 接入终端然后将该干扰信息(402a)发送(402)到接入点,该接入点编译与每个接入终端相关的每个信号的质量相关联的干扰信息矩阵(906)。 使用该信息,接入点选择(302,702)适当的信道,以尽可能高的信道质量来服务于最多的接入终端。
    • 4. 发明申请
    • SENSING WIRELESS COMMUNICATIONS IN TELEVISION FREQUENCY BANDS
    • 电视频段中的无线通信
    • WO2011022505A3
    • 2011-04-14
    • PCT/US2010045931
    • 2010-08-18
    • QUALCOMM INCSHELLHAMMER STEPHEN JSADEK AHMED KZHANG WENYI
    • SHELLHAMMER STEPHEN JSADEK AHMED KZHANG WENYI
    • H04B17/00
    • H04B17/0057H04B17/26H04B17/318H04B17/382
    • In general, techniques are described for sensing wireless communications in television frequency bands, which may be implemented by a sensing device comprising a sensing unit, a power spectral density (PSD) estimation unit, a filter unit, a candidate selection unit, an analysis unit and a decision unit. The sensing unit senses a signal in the television frequencies bands. The PSD estimation unit calculates an estimate of a PSD for the sensed signal. The filter unit filters the estimated PSD. The candidate selection unit analyzes the filtered PSD to identify a candidate frequency representative of a potentially in use frequency. The analysis unit computes a test statistic for the candidate frequency. The decision unit compares the test statistic to a threshold to identify whether the candidate frequencies is actively in use by wireless communication devices.
    • 通常,描述了用于感测电视频带中的无线通信的技术,其可以由包括感测单元,功率谱密度(PSD)估计单元,滤波器单元,候选选择单元,分析单元 和决策单位。 感测单元感测电视频带中的信号。 PSD估计单元计算感测信号的PSD的估计。 过滤器单元过滤估计的PSD。 候选选择单元分析经滤波的PSD以识别代表潜在使用频率的候选频率。 分析单元计算候选频率的测试统计量。 决策单元将测试统计量与阈值进行比较,以识别候选频率是否被无线通信设备主动使用。