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    • 5. 发明申请
    • HIGH-DENSITY MULTI-CHANNEL QAM MODULATOR USING AN IDFT/IFFT AND POLYPHASE FILTER BANK
    • 使用IDFT / IFFT和POLYPHASE FILTER BANK的高密度多通道QAM调制器
    • US20130034189A1
    • 2013-02-07
    • US13204450
    • 2011-08-05
    • Zhuan Ye
    • Zhuan Ye
    • H04L27/36
    • H04L27/36H04L27/264H04L27/2697
    • Methods and apparatuses are provided for increasing the frequency resolution of a multi-channel QAM modulator and using a novel IDFT/IFFT and polyphase filter bank architecture to provide a more computationally efficient and high density multi-channel QAM modulator. The implementations of the improved multi-channel QAM modulator modulate QAM symbol streams onto respective carrier signals where the frequency of each carrier signal is an integer multiple of a fraction of the input sample rate of the respective QAM symbol stream. The modulated carriers are then combined using a novel IDFT/IFFT and polyphase filter bank architecture.
    • 提供了用于增加多通道QAM调制器的频率分辨率和使用新颖的IDFT / IFFT和多相滤波器组架构来提供更高计算效率和高密度多通道QAM调制器的方法和装置。 改进的多信道QAM调制器的实施方式将QAM符号流调制到相应载波信号上,其中每个载波信号的频率是相应QAM符号流的输入采样速率的一部分的整数倍。 然后使用新颖的IDFT / IFFT和多相滤波器组架构来组合调制的载波。
    • 6. 发明授权
    • Signal detection in cognitive radio systems
    • 认知无线电系统中的信号检测
    • US08140017B2
    • 2012-03-20
    • US12241019
    • 2008-09-29
    • Qicai ShiNeiyer S. CorrealSpyros KyperountasZhuan Ye
    • Qicai ShiNeiyer S. CorrealSpyros KyperountasZhuan Ye
    • H04B17/00
    • H04B17/318
    • A cognitive radio wireless device (114) dynamically manages signal detection in a cognitive radio system (100). Spectrum sensing is performed for a first sensing frame on at least one communication channel. At least one observed signal is received (204) on the at least one communication channel. A detection decision (210) is performed to determine if the observed signal is noise or an active signal associated with an active user. The detection decision (210) is performed by comparing observed signal energy estimation with a current detection threshold. The current detection threshold can be an arbitrarily defined threshold or a detection threshold based on a previous detection decision for a sensing frame immediately prior to the first sensing frame.
    • 认知无线电无线设备(114)动态地管理认知无线电系统(100)中的信号检测。 对至少一个通信信道上的第一感测帧执行频谱感测。 在至少一个通信信道上接收至少一个观察信号(204)。 执行检测决定(210)以确定观察到的信号是否是噪声或与活动用户相关联的活动信号。 通过将观测信号能量估计与电流检测阈值进行比较来执行检测决定(210)。 根据紧接在第一感测帧之前的感测帧的先前检测判定,当前检测阈值可以是任意定义的阈值或检测阈值。
    • 7. 发明申请
    • SIGNAL DETECTION IN COGNITIVE RADIO SYSTEMS
    • 认知无线电系统的信号检测
    • US20100081387A1
    • 2010-04-01
    • US12241019
    • 2008-09-29
    • Qicai ShiNeiyer S. CorrealSpyros KyperountasZhuan Ye
    • Qicai ShiNeiyer S. CorrealSpyros KyperountasZhuan Ye
    • H04B17/00
    • H04B17/318
    • A cognitive radio wireless device (114) dynamically manages signal detection in a cognitive radio system (100). Spectrum sensing is performed for a first sensing frame on at least one communication channel. At least one observed signal is received (204) on the at least one communication channel. A detection decision (210) is performed to determine if the observed signal is noise or an active signal associated with an active user. The detection decision (210) is performed by comparing observed signal energy estimation with a current detection threshold. The current detection threshold can be an arbitrarily defined threshold or a detection threshold based on a previous detection decision for a sensing frame immediately prior to the first sensing frame.
    • 认知无线电无线设备(114)动态地管理认知无线电系统(100)中的信号检测。 对至少一个通信信道上的第一感测帧执行频谱感测。 在至少一个通信信道上接收至少一个观察信号(204)。 执行检测决定(210)以确定观察到的信号是否是噪声或与活动用户相关联的活动信号。 通过将观测信号能量估计与电流检测阈值进行比较来执行检测决定(210)。 根据紧接在第一感测帧之前的感测帧的先前检测判定,当前检测阈值可以是任意定义的阈值或检测阈值。
    • 9. 发明授权
    • Method and apparatus for performing sample rate conversion
    • 用于执行采样率转换的方法和装置
    • US07227477B2
    • 2007-06-05
    • US11289923
    • 2005-11-30
    • Zhuan Ye
    • Zhuan Ye
    • H03M7/00
    • H03H17/0621H03H17/028
    • A digital modulator having a sample rate converter that does not require that the final output sampling rate, FOUT, of the sample rate converter be at least twice as great as the input sampling rate, FIN, of the sample rate converter. The upsampling interpolation filter stages of the sample rate converter of the invention do not require any reference clocks to be provided by the NCO of the sample rate converter. Therefore, the upsampling interpolation filter stages are decoupled from the final output sampling rate, FOUT. The interpolation algorithms may be implemented in software, hardware, or a combination of software and hardware. In addition, the polynomial-based interpolator of the Farrow Structure of the invention is capable of using an even or odd number of basepoints.
    • 具有采样率转换器的数字调制器,其不要求采样率转换器的最终输出采样率F OUT OUT至少为输入采样速率的两倍, IN 。 本发明的采样率转换器的上采样内插滤波器级不需要由采样率转换器的NCO提供任何参考时钟。 因此,上采样内插滤波器级与最终输出采样率F OUT OUT分离。 内插算法可以在软件,硬件或软件和硬件的组合中实现。 此外,本发明的Farrow Structure的基于多项式的内插器能够使用偶数或奇数个基点。