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1. 发明授权

US06687309B1 System for estimating carrier frequencies of quadrature amplitude modulated signals having high symbol rates 有权
标题翻译：用于估计具有高符号率的正交幅度调制信号的载波频率的系统
公开(公告)号：US06687309B1
公开(公告)日：2004-02-03
申请号：US09675772
申请日：2000-09-29
申请人： Xiangzhou Joe Zhang , Robin A. Bordow
发明人： Xiangzhou Joe Zhang , Robin A. Bordow
IPC分类号： H04L512
CPC分类号： H04L27/38 , H04L2027/0028 , H04L2027/0048 , H04L2027/0065
摘要： A first system includes a converter, complex signal generator, exponentiator, FFT module and processor to estimate carrier frequency of a high symbol rate quadrature amplutide modulated (QAM) signal relative to a target carrier frequency. The converter converts the applied QAM signal to an intermediate frequency (IF) signal and digitizes the IF signal at a predesignated sample rate. The complex signal generator extracts a real component of the digitized IF signal, provides an imaginary component of the digitized IF signal and then combines the real component and the imaginary component in a complex signal. The exponentiator, raises the complex signal to a predesignated power and the FFT module performs a Fast Fourier Transform (FFT), having a predetermined number of samples, on the complex signal as raised to the predesignated power. The processor, takes the magnitude of the resulting FFT, extracts the index of a sample within the resulting FFT having the greatest magnitude and estimates the carrier frequency of the applied QAM signal relative to a target carrier frequency based on the predesignated power, the extracted index and the predesignated sample rate. In a second system a quadrature downconverter replaces the complex signal generator.
摘要翻译：第一系统包括转换器，复信号发生器，指数器，FFT模块和处理器，用于估计相对于目标载波频率的高符号速率正交幅度调制（QAM）信号的载波频率。转换器将应用的QAM信号转换为中频（IF）信号，并以预先指定的采样率对IF信号进行数字化。复信号发生器提取数字化IF信号的实数分量，提供数字化IF信号的虚分量，然后在复信号中组合实分量和虚分量。指数器将复数信号提高到预先指定的功率，并且FFT模块在复合信号上执行具有预定数量的采样的快速傅里叶变换（FFT），以提高到预定功率。处理器获取所得FFT的幅度，提取具有最大幅度的所得FFT内的样本的索引，并且基于预先指定的功率来估计所施加的QAM信号相对于目标载波频率的载波频率，所提取的索引和预先指定的采样率。在第二系统中，正交下变频器代替复信号发生器。

2. 发明授权

US07474638B2 Method and system for distributed baseband measurements 有权
标题翻译：分布式基带测量方法和系统
公开(公告)号：US07474638B2
公开(公告)日：2009-01-06
申请号：US10737432
申请日：2003-12-15
申请人： Yi He , Xiangzhou Joe Zhang , John E. Neeley
发明人： Yi He , Xiangzhou Joe Zhang , John E. Neeley
IPC分类号： H04Q7/00
CPC分类号： H04B17/327 , H04B2201/7071
摘要： A baseband measurement system includes a host and a Digital Immediate Frequency (DIF) subsystem. The DIF subsystem includes both hardware and software components, such as, for example, a microprocessor and its associated software, a FPGA, one or more ASICs, and memory. The baseband measurements are processed using the FPGA, ASICs, and the microprocessor and its software. The microprocessor controls the flow of the data in and out of the memory and distributes the processing tasks to both the hardware and software components in a cooperative manner. The microprocessor orchestrates the measurements and processing by operating as a measurement state machine. Selection of the proper component is based on the type of measurement and its processing requirements, as well as the current state of the hardware and software components. The host receives the processed data and performs post-processing operations if needed. The host also displays the processed data.
摘要翻译：基带测量系统包括主机和数字立即频率（DIF）子系统。 DIF子系统包括硬件和软件组件，例如微处理器及其相关软件，FPGA，一个或多个ASIC和存储器。基带测量使用FPGA，ASIC以及微处理器及其软件进行处理。微处理器控制数据进出存储器的流程，并以合作的方式将处理任务分配给硬件和软件组件。微处理器通过作为测量状态机进行操作来调节测量和处理。选择适当的组件是基于测量类型及其处理要求，以及硬件和软件组件的当前状态。主机接收处理后的数据，并根据需要执行后处理操作。主机还显示已处理的数据。

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