-
1.发明授权Blind carrier offset detection for quadrature modulated digital communication systems 失效正交调制数字通信系统的盲载波偏移检测公开(公告)号：US07254189B1
公开(公告)日：2007-08-07
申请号：US10258626
申请日：2000-04-25
IPC分类号： H04L27/00
CPC分类号： H04L27/3836 , H04L27/2332 , H04L27/3854 , H04L2027/0065 , H04L2027/0085
摘要： A system and method for estimating the frequency offset experienced between carrier and local oscillator frequencies in communication systems using quadrature modulation. The invention exploits the geometry of the quadrature modulation constellation and estimates actual offset within a predefined carrier offset value without requiring data estimation.
摘要翻译： 一种用于估计使用正交调制的通信系统中载波和本地振荡器频率之间经历的频率偏移的系统和方法。 本发明利用正交调制星座的几何形状，并且在预定义的载波偏移值内估计实际偏移量，而不需要数据估计。
-
公开(公告)号：US20070268978A1
公开(公告)日：2007-11-22
申请号：US11888168
申请日：2007-07-31
IPC分类号： H04L5/12
CPC分类号： H04L27/3836 , H04L27/2332 , H04L27/3854 , H04L2027/0065 , H04L2027/0085
摘要： A system for estimating carrier offset includes includes a transmitter configured to transmit a quadrature modulated signal, and a receiver. The receiver includes an input configured to receive the quadrature modulated signal, a local oscillator configured to generate cosine and sine waves at a carrier frequency of the quadrature modulated signal, at least one cosine mixer configured to generate a carrier frequency demodulated output, at least one sine mixer configured to generate a carrier frequency demodulated output, a plurality of lowpass filters configured to filter the demodulated output of the cosine and sine mixers to produce filtered cosine and sine signal components, and a carrier offset detection processor to estimate a carrier offset between the carrier frequency and a local oscillator frequency based on the filtered output of the lowpass filters.
摘要翻译： 用于估计载波偏移的系统包括：发射机，被配置为发送正交调制信号;以及接收机。 所述接收机包括被配置为接收所述正交调制信号的输入端，被配置为在所述正交调制信号的载波频率上产生余弦和正弦波的本地振荡器，配置成产生载波频率解调输出的至少一个余弦混频器，至少一个 配置为产生载波频率解调输出的多个低通滤波器，多个低通滤波器，被配置为对余弦和正弦混频器的解调输出进行滤波，以产生滤波余弦和正弦信号分量;以及载波偏移检测处理器，用于估计载波偏移 基于低通滤波器的滤波输出的载波频率和本地振荡器频率。
-
公开(公告)号：US20050213691A1
公开(公告)日：2005-09-29
申请号：US11126825
申请日：2005-05-11
申请人： Fatih Ozluturk , Stephen Dick , Leonid Kazakevich
发明人： Fatih Ozluturk , Stephen Dick , Leonid Kazakevich
CPC分类号： H04L27/22 , H04L2027/0016 , H04L2027/0024
摘要： A system for balancing a signal having I and Q components includes means for cross correlating the I and Q components to produce a cross correlation product; means for adjusting the gain of each I and Q signal component in accordance with said cross correlation product; and means for adding one component with the adjustable gain of the other component to produce a phase-balanced signal.
摘要翻译： 用于平衡具有I和Q分量的信号的系统包括用于互相关联I和Q分量以产生互相关乘积的装置; 用于根据所述互相关乘积调整每个I和Q信号分量的增益的装置; 以及用于添加具有另一部件的可调增益的一个分量以产生相位平衡信号的装置。
-
4.发明授权公开(公告)号：US07660561B2
公开(公告)日：2010-02-09
申请号：US10769690
申请日：2004-01-22
申请人： Leonid Kazakevich , Gerard Klahn , Fatih Ozluturk
发明人： Leonid Kazakevich , Gerard Klahn , Fatih Ozluturk
IPC分类号： H03C7/02
CPC分类号： H04B7/0868 , H04B7/0811 , H04B7/0857
摘要： Method and apparatus for transfer of signals from multiple antennas down to baseband over a common radio frequency (RF) chain. Antenna selection having greater flexibility and applicability to both uplink and downlink is obtained by giving priority to the antenna receiving a better/best quality signal. Measurements are taken by at least a channel estimator during each time slot to determine the weighting to be given to the antenna with the better/best quality signal. Techniques and apparatus are provided to take measurements over a range of intervals from time slots to single symbols, for example, to select the best signal. The techniques described herein may be used individually, and in some cases are combined to receive additional benefits in efficiency. For example, one or more of recent and/or current channel estimation, history, optimization may be employed, in addition to channel estimation, to determine signal quality.
摘要翻译： 用于通过公共射频（RF）链将信号从多个天线向下传输到基带的方法和装置。 通过优先考虑接收更好/最佳质量信号的天线，获得对上行链路和下行链路具有更大灵活性和适用性的天线选择。 在每个时隙期间由至少一个信道估计器进行测量，以确定将以更好/最佳质量信号给予天线的加权。 提供了技术和装置，以在从时隙到单个符号的间隔范围内进行测量，例如选择最佳信号。 本文描述的技术可以单独使用，并且在一些情况下被组合以获得效率的附加益处。 例如，除了信道估计之外，可以采用近期和/或当前信道估计，历史，优化中的一个或多个来确定信号质量。
-
5.发明申请公开(公告)号：US20080020725A1
公开(公告)日：2008-01-24
申请号：US11904063
申请日：2007-09-25
IPC分类号： H04B7/00
摘要： A digital baseband (DBB) receiver for receiving and processing a wireless communication signal. The DBB receiver includes at least one low noise amplifier (LNA), at least one demodulator, a direct current (DC) discharge circuit and an LNA control circuit. The LNA selectively amplifies the communication signal. The demodulator outputs analog real and imaginary signal components on real and imaginary signal paths, respectively, in response to receiving the communication signal from the LNA. The DC discharge circuit selectively discharges DC accumulating on at least one of the real and imaginary signal paths. The LNA control circuit turns the LNA on or off.
摘要翻译： 一种用于接收和处理无线通信信号的数字基带（DBB）接收机。 DBB接收器包括至少一个低噪声放大器（LNA），至少一个解调器，直流（DC）放电电路和LNA控制电路。 LNA选择性地放大通信信号。 解调器响应于接收到来自LNA的通信信号，分别在实信号路径和虚信号路径上输出模拟实信号和虚信号分量。 直流放电电路选择性地放电积累在实信号路径和虚信号路径中的至少一个上的DC。 LNA控制电路打开或关闭LNA。
-
6.发明授权公开(公告)号：US07280812B2
公开(公告)日：2007-10-09
申请号：US10832594
申请日：2004-04-27
摘要： A digital baseband (DBB) receiver for receiving and processing a wireless communication signal. The DBB receiver includes at least one low noise amplifier (LNA), at least one demodulator, a direct current (DC) discharge circuit and an LNA control circuit. The LNA selectively amplifies the communication signal. The demodulator outputs analog real and imaginary signal components on real and imaginary signal paths, respectively, in response to receiving the communication signal from the LNA. The DC discharge circuit selectively discharges DC accumulating on at least one of the real and imaginary signal paths. The LNA control circuit turns the LNA on or off.
摘要翻译： 一种用于接收和处理无线通信信号的数字基带（DBB）接收机。 DBB接收器包括至少一个低噪声放大器（LNA），至少一个解调器，直流（DC）放电电路和LNA控制电路。 LNA选择性地放大通信信号。 解调器响应于接收到来自LNA的通信信号，分别在实信号路径和虚信号路径上输出模拟实信号和虚信号分量。 直流放电电路选择性地放电积累在实信号路径和虚信号路径中的至少一个上的DC。 LNA控制电路打开或关闭LNA。
-
公开(公告)号：US06934344B2
公开(公告)日：2005-08-23
申请号：US09817455
申请日：2001-03-26
申请人： Leonid Kazakevich , Fatih Ozluturk
发明人： Leonid Kazakevich , Fatih Ozluturk
CPC分类号： H03G7/001 , H03G3/3052
摘要： A system for automatic gain control prevents input overload by precisely controlling the input level of a received, digitally modulated signal without using a variable gain amplifier. A limiting amplifier in conjunction with a logarithmic detector splits an input signal path in two, providing separate phase and amplitude information for downstream digital signal processing, where the separate phase and amplitude information is processed without variable gain artifacts. The separated phase information may further be divided into I and Q signals.
摘要翻译： 用于自动增益控制的系统通过在不使用可变增益放大器的情况下精确地控制接收的数字调制信号的输入电平来防止输入过载。 与对数检测器结合的限幅放大器将输入信号路径分离成两个，为下游数字信号处理提供单独的相位和幅度信息，其中单独的相位和幅度信息被处理而没有可变增益伪像。 分离的相位信息还可以被分成I和Q信号。
-
8.发明申请公开(公告)号：US20050003777A1
公开(公告)日：2005-01-06
申请号：US10832594
申请日：2004-04-27
摘要： A method for manufacturing a plurality or metal core substrates for a surface-mounted light emitting diode includes steps of adhering a pair of metal base plates and a plurality of insulation layers, adhering a pair of metal base plates interposing one of the insulation layers as a first insulation layer to form a set plate, stacking a plurality of set plates between a pair of guide plates, interposing a separation gap between adjacent set plates to form a set plate block, cutting the set plate block in a stacking direction to form a set plate aggregation, securing a second insulation layer to a cut surface of the set plate aggregation, securing a circuit pattern aggregation layer to the second insulation layer to form a metal core substrate aggregation, forming a separation groove on the circuit pattern aggregation layer between adjacent set plates, corresponding to the separation gap, forming a groove along a center line of the set plate to separate the set plate into first and second circuit pattern aggregations, forming electrodes on both sides of the substrate aggregation, separating the guide plates, and cutting off the substrate aggregation into independent substrates.
摘要翻译： 用于制造表面安装发光二极管的多个或金属芯基板的方法包括以下步骤：粘附一对金属基板和多个绝缘层，将一个绝缘层中的一个金属基板粘附在一起 第一绝缘层以形成固定板，在一对引导板之间堆叠多个固定板，在相邻的固定板之间插入分隔间隙以形成固定板块，在堆叠方向上切割固定板块以形成一组 将第二绝缘层固定到固定板聚集体的切割表面上，将电路图案聚集层固定到第二绝缘层以形成金属芯基板聚集，在相邻集合之间的电路图案聚集层上形成分隔槽 对应于分离间隙的板，沿着固定板的中心线形成凹槽，以将固定板分离成第一和第二 d电路图案聚集，在基板聚集的两侧形成电极，分离引导板，并将基板聚集体切割成独立的基板。
-
9.发明授权公开(公告)号：US07343180B2
公开(公告)日：2008-03-11
申请号：US10713601
申请日：2003-11-14
CPC分类号： H04B7/0837 , H04B7/0871 , H04B17/309 , H04B17/318 , H04W52/42
摘要： A wireless transmit/receive unit (WTRU) has multiple receivers with an interface to combine received signals to provided enhanced reception. A control unit selectively controls the powering of the receivers to limit power consumption based on selected parameters.
摘要翻译： 无线发射/接收单元（WTRU）具有多个具有组合接收信号以提供增强接收的接口的接收机。 控制单元选择性地控制接收机的供电以基于所选择的参数来限制功耗。
-
公开(公告)号：US20070010223A9
公开(公告)日：2007-01-11
申请号：US10832594
申请日：2004-04-27
摘要： A digital baseband (DBB) receiver for receiving and processing a wireless communication signal. The DBB receiver includes at least one low noise amplifier (LNA), at least one demodulator, a direct current (DC) discharge circuit and an LNA control circuit. The LNA selectively amplifies the communication signal. The demodulator outputs analog real and imaginary signal components on real and imaginary signal paths, respectively, in response to receiving the communication signal from the LNA. The DC discharge circuit selectively discharges DC accumulating on at least one of the real and imaginary signal paths. The LNA control circuit turns the LNA on or off.
-
-
-
-
-
-
-
-
-
搜索结果
106 条记录 (耗时 0.019 秒)
