专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US08144572B2 Detection and mitigation of interference and jammers in an OFDM system 有权
标题翻译：检测和减轻OFDM系统中的干扰和干扰
公开(公告)号：US08144572B2
公开(公告)日：2012-03-27
申请号：US11226654
申请日：2005-09-14
申请人： Matthew B. Shoemake , Sridhar Rajagopal , John D. Terry
发明人： Matthew B. Shoemake , Sridhar Rajagopal , John D. Terry
IPC分类号： H04J11/00
CPC分类号： H04B17/345
摘要： The present invention provides a method and apparatus for detecting interference in a wireless communications system. The invention compares the receiver FFT output of a received signal against known sequences such as the packet synchronization sequence, frame synchronization sequence, and channel estimation sequence. By comparing the reference signal to the known sequences, the invention estimates the instantaneous signal to noise ratio (SNR) for each tone of a wireless transmission. To improve the SNR estimate, the invention computes a weighted average across multiple OFDM symbols. The invention looks for significant increases (spikes) in the SNR as a way of distinguishing interfering signals from noise. The invention can store separate SNR estimates for each transmitter in a wireless network. One embodiment of the invention uses Viterbi branch metrics in conjunction with the estimated SNR to determine the presence of an interfering signal. If interference is detected the invention feeds the inverse of the SNR estimate into the Viterbi decoder or declares and erasure for that symbol.
摘要翻译：本发明提供一种用于检测无线通信系统中的干扰的方法和装置。本发明将接收信号的接收机FFT输出与诸如分组同步序列，帧同步序列和信道估计序列的已知序列进行比较。通过将参考信号与已知序列进行比较，本发明估计无线传输的每个音调的瞬时信噪比（SNR）。为了提高SNR估计，本发明计算跨多个OFDM符号的加权平均。本发明寻找SNR中的显着增加（尖峰）作为区分干扰信号和噪声的一种方式。本发明可以在无线网络中为每个发射机存储单独的SNR估计。本发明的一个实施例使用维特比分支度量结合估计的SNR来确定干扰信号的存在。如果检测到干扰，本发明将SNR估计的逆向馈送到维特比解码器中，或者声明并擦除该符号。

2. 发明授权

US5539417A Antenna clip assembly and antenna control circuit for cellular phone 失效
标题翻译：天线夹组件和手机天线控制电路
公开(公告)号：US5539417A
公开(公告)日：1996-07-23
申请号：US340825
申请日：1994-11-16
申请人： John D. Terry , Brien J. Denheyer
发明人： John D. Terry , Brien J. Denheyer
IPC分类号： H01Q1/08 , H01Q1/24
CPC分类号： H01Q1/242 , H01Q1/088
摘要： An antenna clip includes a U-shaped front end that slides into a slot on an edge of a printed circuit board (PCB). The PCB holds the clip rigidly in both a lateral direction and in a front to back parallel orientation with the PCB providing a reliable electrical contact between the antenna and the phone electrical circuitry. An antenna switching circuit switches between an internally connected antenna and an external system detachably coupled to an external connector. The antenna circuit has a wire length of .lambda./4 between the phone circuit and the antenna and a wire length of N.lambda./2 between the phone circuitry and the external system. The antenna then appears as an open circuit when coupled to ground through a diode. Alternatively, the external connector appears as an open circuit when disconnected from the external system.
摘要翻译：天线夹包括滑入印刷电路板（PCB）边缘的槽中的U形前端。 PCB在横向方向和从前到后的平行取向上均匀地夹持夹子，PCB在天线和电话电路之间提供可靠的电接触。天线切换电路在内部连接的天线和可拆卸地耦合到外部连接器的外部系统之间切换。天线电路在电话电路和天线之间的电线长度为λ/ 4，电话电路和外部系统之间的线长度为N lambda / 2。当通过二极管耦合到地面时，天线将显示为开路。或者，当与外部系统断开连接时，外部连接器显示为开路。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式