公开(公告)号：US06341146B1

公开(公告)日：2002-01-22

申请号：US09181810

申请日：1998-10-29

申请人： Robert E. Johnson ,  George P. Vella-Coleiro

发明人： Robert E. Johnson ,  George P. Vella-Coleiro

IPC分类号： H03D318

CPC分类号： H04L27/2337

摘要： A demodulator demodulates a PSK communications signal using a synchronizer, a period window detector, and a logic device. The synchronizer provides a transition signal representing reference edges of the communication signal. The period window detector, coupled to the synchronizer, establishes a time interval based on the period of the transition signal. Finally, the logic device, having logic inputs coupled to the outputs of the period-window detector, yields a logic output signal. The demodulator preferably includes a carrier boundary detector for framing messages and minimizing noise detection in a manner that permits signal strength measurements over a wide dynamic range.

摘要翻译： 解调器使用同步器，周期窗口检测器和逻辑器件解调PSK通信信号。 同步器提供表示通信信号的参考边缘的转换信号。 耦合到同步器的周期窗检测器基于转换信号的周期建立时间间隔。 最后，具有耦合到周期窗口检测器的输出的逻辑输入的逻辑器件产生逻辑输出信号。 解调器优选地包括载波边界检测器，用于以允许在宽动态范围上进行信号强度测量的方式对消息进行成帧和最小化噪声检测。

公开(公告)号：US06339623B1

公开(公告)日：2002-01-15

申请号：US09081352

申请日：1998-05-19

申请人： Takanori Iwamatsu

发明人： Takanori Iwamatsu

IPC分类号： H03D318

CPC分类号： H04L27/3872 ,  H03D3/007 ,  H03J1/0091 ,  H03L7/093 ,  H03L7/12 ,  H03L2207/14 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0073

摘要： A reference carrier generator device includes a phase error detection unit which detects a phase error between a reference carrier and a carrier of a quadrature modulated wave and outputs a phase error signal indicating the phase error. A loop filter passes the phase error signal from the phase error detection unit through the loop filter and converts the phase error signal into a control voltage. A voltage-controlled oscillator outputs a reference carrier synchronous with the carrier of the quadrature modulated wave based on the control voltage. A sweep unit changes the control voltage output to the oscillator when pulling the reference carrier into synchronism in response to an out-of-sync alarm signal. The sweep unit outputs a staircase sweep signal having a selected level, the sweep signal being added to the phase error signal such that the control voltage output to the oscillator is changed by the staircase sweep signal.

摘要翻译： 参考载波发生器装置包括相位误差检测单元，其检测参考载波和正交调制波的载波之间的相位误差，并输出指示相位误差的相位误差信号。 环路滤波器将来自相位误差检测单元的相位误差信号通过环路滤波器，并将相位误差信号转换成控制电压。 压控振荡器基于控制电压输出与正交调制波的载波同步的参考载波。 扫描单元响应于不同步报警信号将参考载波拉入同步时，将控制电压输出改变为振荡器。 扫描单元输出具有所选电平的阶梯扫描信号，扫描信号被加到相位误差信号上，使得输出到振荡器的控制电压被阶梯扫描信号改变。

公开(公告)号：US06282249B1

公开(公告)日：2001-08-28

申请号：US09011490

申请日：1998-02-11

申请人： M. T. Tomesen ,  Leo J. M. Ruitenburg

发明人： M. T. Tomesen ,  Leo J. M. Ruitenburg

IPC分类号： H03D318

CPC分类号： H03L7/0805 ,  H03D7/165 ,  H03J7/285 ,  H03L7/107 ,  H04B7/18517

摘要： Proposed is a switchable loop filter structure which allows a dual mode operation. A low bandwidth mode is used during acquisition of a channel. In case of high rate reception the low bandwidth synthesizer loop is combined with a high bandwidth carrier recovery loop. This combination allows steps of the synthesizer which are tracked in the carrier recovery loop. The tuner steps are used to compensate input signals frequency drift. An algorithm is proposed which allows acquisition in a low synthesizer loop bandwidth mode and switching to a high bandwidth synthesizer loop mode while maintaining frequency lock. This allows the use of a high bandwidth synthesizer loop and a low bandwidth carrier recovery loop. This combination is best for reception of low rate input signals. The synthesizer loop compensates for residual FM of the tuner Local Oscillator.

摘要翻译： 提出了一种允许双模式操作的可切换环路滤波器结构。 在采集通道期间使用低带宽模式。 在高速率接收的情况下，低带宽合成器环路与高带宽载波恢复环路相结合。 该组合允许在载波恢复循环中跟踪的合成器的步骤。 调谐器步骤用于补偿输入信号频率漂移。 提出了一种算法，其允许在低合成器环路带宽模式下采集并切换到高带宽合成器环路模式，同时保持频率锁定。 这允许使用高带宽合成器环路和低带宽载波恢复环路。 这种组合最适合接收低速率输入信号。 合成器环路补偿调谐器本地振荡器的残差FM。

公开(公告)号：US06801585B1

公开(公告)日：2004-10-05

申请号：US09690698

申请日：2000-10-16

申请人： Thai M. Nguyen ,  Pengfei Zhang

发明人： Thai M. Nguyen ,  Pengfei Zhang

IPC分类号： H03D318

CPC分类号： H03D7/1441 ,  H03D7/1433 ,  H03D7/1458 ,  H03D7/165 ,  H03D2200/009

摘要： A wireless receiver apparatus including a voltage controller oscillator and mixer. The voltage controlled oscillator generates a first signal having a first frequency, and a second signal having the first frequency. The first and second signals are in quadrature. The mixer has a first input port for receiving the first signal, and a second input port for receiving the second signal, a third input port for receiving a third signal at a frequency centered about a third frequency. The mixer generates a fourth signal having a frequency centered about a fourth frequency which is equal to the third frequency less twice the first frequency.

摘要翻译： 一种包括电压控制振荡器和混频器的无线接收机装置。 压控振荡器产生具有第一频率的第一信号和具有第一频率的第二信号。 第一和第二信号是正交的。 混频器具有用于接收第一信号的第一输入端口和用于接收第二信号的第二输入端口，用于以中心为大约第三频率的频率接收第三信号的第三输入端口。 混频器产生具有以第四频率为中心的频率的第四信号，第四频率等于第三频率小于第一频率的两倍。

公开(公告)号：US06763074B1

公开(公告)日：2004-07-13

申请号：US09710764

申请日：2000-11-08

申请人： Ganning Yang

发明人： Ganning Yang

IPC分类号： H03D318

CPC分类号： H04L1/22 ,  H04L27/22

摘要： A demodulation system capable of configuring itself responsive to channel conditions. A plurality of detectors may be provided, one or more of which may be better able to handle a particular form of interference than one or more of the other detectors. The detectors estimate source bits from a common signal. One or more signal quality estimators receive the estimated bits for the detectors, and provide performance metrics for each of the detectors. A selector selects or continues the pre-selection of one of the detectors responsive to the performance metrics. A multiplexor outputs the estimated bits from the selected or pre-selected detector.

摘要翻译： 一种能够根据信道条件配置自身的解调系统。 可以提供多个检测器，其中的一个或多个可以比一个或多个其他检测器更好地处理特定形式的干扰。 检测器从公共信号估计源比特。 一个或多个信号质量估计器接收检测器的估计比特，并为每个检测器提供性能指标。 选择器根据性能指标选择或继续预选其中一个检测器。 多路复用器从所选择的或预先选择的检测器输出估计的比特。

公开(公告)号：US06411660B1

公开(公告)日：2002-06-25

申请号：US09080518

申请日：1998-05-18

申请人： Tae-won Oh

发明人： Tae-won Oh

IPC分类号： H03D318

CPC分类号： H03L7/23 ,  H03J5/0272 ,  H03L7/10 ,  H04B1/40 ,  H04B1/44

摘要： A device for reducing a lock-up time in a digital cordless telephone. The telephone includes a first frequency synthesizer for generating a reference frequency, a receiver having a first mixer for mixing the reference frequency with an input frequency to generate a first intermediate frequency and a second mixer to generate a second intermediate frequency, and a transmitter having a third mixer to generate a transmission frequency. The device includes: a band switching controller for receiving an inverse channel selection signal; and a second frequency synthesizer for generating third and fourth intermediate frequencies to the second and third mixers, respectively, according to a channel selection signal for setting transmission and reception modes. The second frequency synthesizer includes: a voltage controlled oscillator for generating a frequency according to a charge pump voltage applied at an input of the oscillator; a loop filter for shaping the charge pump voltage being applied to the input of the voltage controlled oscillator; and a phase locked loop for comparing the reference frequency with a frequency output from the voltage controlled oscillator to generate a voltage according to a phase difference therebetween to the input of the voltage controlled oscillator via the loop filter. The band switching controller maintains an input voltage of the voltage controlled oscillator upon receiving the inverse channel selection signal.

摘要翻译： 一种减少数字无绳电话锁定时间的设备。 该电话包括用于产生参考频率的第一频率合成器，具有用于混合参考频率与输入频率以产生第一中频的第一混频器的接收机和用于产生第二中频的第二混频器，以及具有 第三混频器产生传输频率。 该装置包括：频带切换控制器，用于接收反向信道选择信号; 以及第二频率合成器，用于根据用于设置发送和接收模式的信道选择信号分别向第二和第三混频器产生第三和第四中频。 第二频率合成器包括：压控振荡器，用于根据在振荡器的输入端施加的电荷泵电压产生频率; 用于对施加到压控振荡器的输入端的电荷泵电压进行整形的环路滤波器; 以及锁相环，用于将参考频率与从压控振荡器输出的频率进行比较，以通过环路滤波器将电压根据它们之间的相位差产生到压控振荡器的输入端。 频带切换控制器在接收到反向信道选择信号时保持压控振荡器的输入电压。

公开(公告)号：US06335952B1

公开(公告)日：2002-01-01

申请号：US09121601

申请日：1998-07-24

申请人： Kyeongho Lee ,  Deog-Kyoon Jeong

发明人： Kyeongho Lee ,  Deog-Kyoon Jeong

IPC分类号： H03D318

CPC分类号： H03H11/22 ,  H03D7/1441 ,  H03H2011/0494 ,  H03K9/00 ,  H03L7/0891 ,  H03L7/0995 ,  H03L7/1974 ,  H04B1/403

摘要： A single chip RF communication system and method is provided including a transmitter and a receiver. The RF communication system in accordance with the present invention includes an antenna for receiving transmitting RF signals, a PLL for generating multi-phase clock signals having a frequency different from a carrier frequency in response to the multi-phase clock signals and a reference signal having the carrier frequency, a demodulation-mixing unit for mixing the received RF signals with the multi-phase clock signals having the frequency different from the carrier frequency to output the RF signals having a frequency reduced by the carrier frequency and an A/D converting unit for converting the RF signals from the mixing unit into digital signals.

摘要翻译： 提供了包括发射机和接收机的单芯片RF通信系统和方法。 根据本发明的RF通信系统包括用于接收发射RF信号的天线，用于响应于多相时钟信号产生具有与载波频率不同的频率的多相时钟信号的PLL和具有 载波频率，用于将接收到的RF信号与具有与载波频率不同的频率的多相时钟信号混合的解调混合单元，以输出具有被载波频率减小的频率的RF信号和A / D转换单元 用于将来自混合单元的RF信号转换成数字信号。

公开(公告)号：US06295324B1

公开(公告)日：2001-09-25

申请号：US08988249

申请日：1997-12-10

申请人： J. William Whikehart

发明人： J. William Whikehart

IPC分类号： H03D318

CPC分类号： H04B1/1661 ,  H04H20/12 ,  H04H40/63 ,  H04H40/72

摘要： A signal quality indicator for frequency modulated or phase modulated communication signals is obtained using a full-complex detector. The noise detector looks at the actual signal of interest and not other outside indicators such as high frequency content. Signal quality is measured accurately and efficiently. The resulting measure is used to control subsequent processing such as stereo blend, noise blanking, diversity antenna switching, and others in an FM radio receiver.

摘要翻译： 使用全复合检测器获得调频或相位调制通信信号的信号质量指示符。 噪声检测器查看感兴趣的实际信号，而不是其他外部指示器，如高频内容。 信号质量测量准确高效。 所得到的测量用于控制后续处理，例如FM收音机中的立体声混合，噪声消隐，分集天线切换等。

公开(公告)号：US06236687B1

公开(公告)日：2001-05-22

申请号：US09258846

申请日：1999-02-26

申请人： Gregory S. Caso ,  David A. Wright ,  Dominic P. Carrozza

发明人： Gregory S. Caso ,  David A. Wright ,  Dominic P. Carrozza

IPC分类号： H03D318

CPC分类号： H04L1/0057 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0055 ,  H04L2027/0089

摘要： An improved digital decision directed phase locked loop (DD-PLL) for use with short block codes using phase shifting keying (PSK) modulation. The improvement involves a conventional digital phase lock loop which is modified to base its loop corrections on the results obtained by decoding the short block code rather than on a symbol by symbol basis as is customary in conventional DD-PLLs. The improved method of loop corrections involves retaining the symbol data pending the decoder's decision, derotating the retained data in accordance with the decoded result, and integrating the derotated data to form a composite estimator upon which to base the loop correction. In its preferred embodiment, the invention uses an (8, 4) biorthogonal code with quatenary PSK.

摘要翻译： 改进的数字决策定向锁相环（DD-PLL），用于使用相移键控（PSK）调制的短块码。 该改进涉及传统的数字锁相环，其被修改为将其循环校正基于通过解码短块码获得的结果，而不是按照传统DD-PLL中的惯例的符号依据。 改进的循环校正方法涉及保留符号数据等待解码器的判定，根据解码结果对保留的数据进行解除，并且整合解旋数据以形成基于循环校正的复合估计器。 在其优选实施例中，本发明使用具有四分之一PSK的（8,4）双正交码。