公开(公告)号：US5448242A

公开(公告)日：1995-09-05

申请号：US233872

申请日：1994-04-26

申请人： Claude A. Sharpe ,  Oscar Barraza

发明人： Claude A. Sharpe ,  Oscar Barraza

IPC分类号： G01S13/78 ,  G01S13/76 ,  H04B1/59 ,  G01S13/75

CPC分类号： G01S13/767

摘要： Disclosed is a system and method which protects a transponder or tag (14) from being enabled or awakened by spurious RF energy. A modulation detector (64) is provided which detects a modulation signal that is superimposed upon an RF modulation from an interrogator (12). Preferably this superimposed modulation is of a low frequency, below those typically existing as Electro-Magnetic Interference (EMI), such that the transponder (14) is less likely to be erroneously activated by an unintended RF signal. Upon reception of an RF interrogation having the proper modulation superimposed thereupon, the modulation detector (64) is operable to awaken other circuitry within the transponder (14) such that the transponder (14) is then operable to communicate with the interrogator (12).

摘要翻译： 公开了一种系统和方法，其保护应答器或标签（14）不被虚假的RF能量使能或唤醒。 提供了一种调制检测器（64），其从询问器（12）检测叠加在RF调制上的调制信号。 优选地，该重叠调制是低频率，低于通常作为电磁干扰（EMI）存在的频率，使得应答器（14）不太可能被非预期的RF信号错误地激活。 在接收到具有叠加的适当调制的RF询问时，调制检测器（64）可操作以唤醒应答器（14）内的其他电路，使得应答器（14）然后可操作以与询问器（12）通信。

公开(公告)号：US20080089401A1

公开(公告)日：2008-04-17

申请号：US11860935

申请日：2007-09-25

申请人： Pao-Jen Lai ,  Khurram Waheed ,  Oren Eliezer ,  Gunvant T. Patel ,  Oscar Barraza

发明人： Pao-Jen Lai ,  Khurram Waheed ,  Oren Eliezer ,  Gunvant T. Patel ,  Oscar Barraza

IPC分类号： H04B3/46

CPC分类号： H04W24/00

摘要： One embodiment of the invention includes a method for testing the performance of a Global System for Mobile Communications (GSM) transmitter. The output of the GSM transmitter is converted to a digital signal. A power spectrum is estimated for the GSM transmitter according to the digital signal via a modified periodogram algorithm. A phase trajectory of the digital signal is determined, and an ideal phase signal is determined from the determined phase trajectory. A phase trajectory error is calculated from the determined phase trajectory and the determined ideal phase signal. A tested device may be considered compliant if the abovementioned phase error and spectral mask meet specific defined criteria, and fails the test if either of these does not meet the predefined limits. The present invention is targeted at reducing the test time and test equipment traditionally associated with the implementation of these tests.

摘要翻译： 本发明的一个实施例包括用于测试全球移动通信系统（GSM）发射机的性能的方法。 GSM发射机的输出被转换为数字信号。 通过修改的周期图算法，根据数字信号为GSM发射机估计功率谱。 确定数字信号的相位轨迹，并从所确定的相位轨迹确定理想的相位信号。 从确定的相位轨迹和确定的理想相位信号计算相位轨迹误差。 如果上述相位误差和光谱掩模满足特定的定义标准，则被测试的设备可能被认为是兼容的，并且如果其中任一个不满足预定义的限制，则测试设备失败。 本发明旨在减少传统上与这些测试的实施相关联的测试时间和测试设备。