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1. 发明授权

US07310504B2 IF frequency response characterization employing overlapping frequency bands 失效
标题翻译： IF频率响应表征采用重叠频带
公开(公告)号：US07310504B2
公开(公告)日：2007-12-18
申请号：US10811337
申请日：2004-03-26
申请人： Raymond A. Birgenheier , Richard P. Ryan
发明人： Raymond A. Birgenheier , Richard P. Ryan
IPC分类号： H04B17/00
CPC分类号： H04B17/20 , H04B17/0085 , H04B17/21
摘要： A method and system characterizes an IF response of a receiver under test, such that an effect on the characterization by errors associated with uncertainties in knowledge of an RF stimulus signal used to perform the characterization is reduced. The method includes determining an estimate of an actual IF response of the receiver under test from IF responses of the receiver under test measured at overlapping frequency bands and a set of conversion coefficients computed therefrom, such that the estimate reduces the effect of the errors. The system includes a signal generator, an IF processor, a computer program, and a controller that controls the generator and the processor and executes the computer program. When a receiver under test is characterized, the receiver is connected between the signal generator, the IF processor and the controller. The computer program includes instructions that implement characterizing the receiver IF response.
摘要翻译：一种方法和系统表征被测接收机的IF响应，从而降低了与用于执行表征的RF刺激信号的知识不确定性相关的错误对特性的影响。该方法包括根据在重叠频带测量的被测接收机的IF响应和由其计算的一组转换系数来确定被测接收机的实际IF响应的估计，使得该估计减少了误差的影响。该系统包括信号发生器，IF处理器，计算机程序和控制发电机和处理器并执行计算机程序的控制器。当测试的接收机被表征时，接收机连接在信号发生器，IF处理器和控制器之间。该计算机程序包括实现表征接收机IF响应的指令。

2. 发明授权

US5187719A Method and apparatus for measuring modulation accuracy 失效
标题翻译：用于测量调制精度的方法和装置
公开(公告)号：US5187719A
公开(公告)日：1993-02-16
申请号：US559313
申请日：1990-07-30
申请人： Raymond A. Birgenheier , Richard P. Ryan
发明人： Raymond A. Birgenheier , Richard P. Ryan
IPC分类号： G01R25/00 , G01R29/06 , G01R29/26
CPC分类号： G01R25/00 , G01R29/06 , G01R29/26
摘要： A method and apparatus for determining the phase and amplitude accuracy of continuous-phase-modulated signals is described. A modulated RF signal generated by a transmitter is down converted to a relatively low intermediate frequency which is filtered and sampled by a high sampling rate analog-to-digital converter. A digital signal processor processes the digital signals to produce a measured phase function corresponding to the modulated RF signal. From the measured amplitude and phase functions, an estimate of the ideal reference phase function corresponding to the modulated RF signal is calculated and synthesized. The reference phase function is compared to the measured phase function to determine the phase function from which the modulated RF signal phase error and frequency error are computed.
摘要翻译：描述了用于确定连续相位调制信号的相位和幅度精度的方法和装置。由发射机产生的调制RF信号被下变频到相对较低的中频，其被高采样率模数转换器滤波和采样。数字信号处理器处理数字信号以产生对应于经调制的RF信号的测量相位函数。从测量的幅度和相位函数中，计算并合成对应于调制的RF信号的理想参考相位函数的估计。将参考相位功能与测量的相位函数进行比较，以确定相位函数，从而计算调制的RF信号相位误差和频率误差。

3. 发明授权

US5001724A Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulated signal 失效
标题翻译：用于测量连续相位调制信号的相位精度和幅度分布的方法和装置
公开(公告)号：US5001724A
公开(公告)日：1991-03-19
申请号：US297357
申请日：1989-01-13
申请人： Raymond A. Birgenheier , Richard P. Ryan
发明人： Raymond A. Birgenheier , Richard P. Ryan
IPC分类号： G01R29/06 , G01R23/20 , G01R25/00 , G01R29/26 , H04L27/20
CPC分类号： G01R23/20 , G01R25/00 , G01R29/26 , H04L27/2017
摘要： A method and apparatus for determining the phase and amplitude accuracy of continuous-phase-modulated signals is described. A modulated RF signal generated by a transmitter is down converted to a relatively low intermediate frequency which is filtered and sampled by a high sampling rate analog-to-digital convertor. A digital signal processor processes the digital signals to produce a measured amplitude function and a measured phase function corresponding to the modulated RF signal. From the measured amplitude and phase functions, an ideal phase function corresponding to the modulated RF signal is calculated and synthesized. The ideal phase function is compared to the measured phase function to determine the phase function from which the modulated RF signal phase error and frequency error are computed.

4. 发明授权

US5140613A Baseband modulation system with improved ROM-based digital filter 失效
标题翻译：具有改进的基于ROM的数字滤波器的基带调制系统
公开(公告)号：US5140613A
公开(公告)日：1992-08-18
申请号：US529035
申请日：1990-05-25
申请人： Raymond A. Birgenheier , David M. Hoover
发明人： Raymond A. Birgenheier , David M. Hoover
IPC分类号： H03H17/00 , H03H17/02 , H04L27/20
CPC分类号： H03H17/0226 , H04L27/2071
摘要： In a conventional ROM-based digital filtering methodology, N past samples of M-bit input symbols are used to address a memory containing a desired filtered output signal. This memory must have an address space of 2.sup.M*N. According to the present invention, a desired filtered output signal is defined as a composition of signal terms, each of which is a function of less than M*N bits. Individual ROMs are provided for each of these component terms. Address bits for the ROMs are derived from the N past samples of the M-bit input symbols. The ROM outputs are combined to yield the desired filtered output signal.
摘要翻译：在传统的基于ROM的数字滤波方法中，使用N个过去的M位输入符号采样来寻址包含所需滤波输出信号的存储器。该存储器的地址空间必须为2M * N。根据本发明，期望的滤波输出信号被定义为信号项的组合，每个信号项是小于M * N位的函数。为这些组件术语中的每一个提供单独的ROM。 ROM的地址位是从M位输入符号的N个过去取样得到的。 ROM输出被组合以产生所需的滤波输出信号。

5. 发明授权

US07397865B2 Systems and methods of using IQ modulation for calibration or measurement 失效
标题翻译：使用IQ调制进行校准或测量的系统和方法
公开(公告)号：US07397865B2
公开(公告)日：2008-07-08
申请号：US10405555
申请日：2003-04-02
申请人： George S. Moore , Raymond A. Birgenheier
发明人： George S. Moore , Raymond A. Birgenheier
IPC分类号： H04L27/20
CPC分类号： H04L27/364
摘要： A system analyzer may generate an estimated frequency response of a device, system, communication medium, or combination thereof by utilizing a stimulus signal that is robust against IQ modulator impairments. A stimulus generator may be used to generate a plurality of discrete tones according to a frequency spacing and a frequency offset. The frequency spacing and the frequency offset cause spectrally inverted spurs (generated by impairments of the IQ modulator) to occur at frequencies other than frequencies of said modulated signal that are associated with said plurality of discrete tones. Additionally, by implementing a Discrete Fourier Transform (DFT) to possess a frequency resolution equal to the frequency offset, there is no leakage of power associated with the spectrally inverted spurs into frequency bins of the DFT associated with the desired frequency components. Likewise, leakage between the desired frequency components and leakage associated with the local oscillator may be avoided.
摘要翻译：系统分析器可以通过利用针对IQ调制器损伤的鲁棒的刺激信号来生成设备，系统，通信介质或其组合的估计的频率响应。刺激发生器可以用于根据频率间隔和频率偏移产生多个离散音调。频率间隔和频率偏移导致频谱反转的杂散（由IQ调制器的损伤产生）发生在与所述多个离散音调相关联的所述调制信号的频率以外的频率处。另外，通过实现具有等于频率偏移的频率分辨率的离散傅里叶变换（DFT），不存在与频谱反转的杂散相关联的功率泄漏到与期望的频率分量相关联的DFT的频率仓中。同样，可以避免所需频率分量之间的泄漏和与本地振荡器相关的泄漏。

6. 发明授权

US4757519A Digital premodulation filter 失效
标题翻译：数字预调制滤波器
公开(公告)号：US4757519A
公开(公告)日：1988-07-12
申请号：US104201
申请日：1987-10-02
申请人： Robert R. Collison , Michael T. Wende , Raymond A. Birgenheier
发明人： Robert R. Collison , Michael T. Wende , Raymond A. Birgenheier
IPC分类号： H03C3/00 , H03H17/00 , H03H17/02 , H03H17/06 , H04L27/12 , H04L27/20 , H03C3/08
CPC分类号： H03H17/0294 , H03H17/0607
摘要： A programmable premodulation filter having a finite impulse response to digitally filter a digital data signal to provide a modulation signal for modulating an RF carrier signal is described. A digital summer and accumulator are programmed to provide a finite impulse response to a bimodal impulse signal which represents the input digital data signal. Several impulse response functions g(t) are stored in a ROM (or RAM) and may be selected to reprogram the digital filter to provide a desired modulation format. When a RAM is used, additional impulse response functions may be input to the RAM and the stored impulse response functions may be dynamically modified to provide the desired modulation format.

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