公开(公告)号：US20070287401A1

公开(公告)日：2007-12-13

申请号：US11843004

申请日：2007-08-22

申请人： Dennis Cleary ,  Carmine Pagano ,  Hayim Penso ,  John Rucki

发明人： Dennis Cleary ,  Carmine Pagano ,  Hayim Penso ,  John Rucki

IPC分类号： H04B1/26

CPC分类号： H03J1/005 ,  H03D7/161

摘要： In a receiver of a transmission system in which the data transmission rate is not an integer multiple of the spacing between transmission channels, a single oscillator is used to generate both the system clock used to process the data signal as well as the mixing signal used to downconvert the received RF signal to an intermediate frequency (IF). The frequency error in the IF signal that results from mixing the RF signal at a less-than-ideal mixing frequency is compensated by selecting an appropriate mixing signal frequency applied when downconverting the IF signal to baseband. In a transmitter, the mixing signal frequency used to upconvert the outgoing baseband signal to IF is selected to pre-compensate for the frequency error resulting from upconverting the IF signal to RF using a less-than-ideal mixing frequency. In either case, the receiver/transmitter can be implemented without having to provide a dedicated reference oscillator for converting signals between RF and IF.

摘要翻译： 在其中数据传输速率不是传输信道之间的间隔的整数倍的传输系统的接收机中，使用单个振荡器来产生用于处理数据信号的系统时钟以及用于处理数据信号的混合信号 将所接收的RF信号下变频到中频（IF）。 通过选择在将IF信号下变频到基带时施加的适当的混频信号频率来补偿在不合理的混频时将RF信号混频所产生的IF信号中的频率误差。 在发射机中，选择用于将输出基带信号上变频到IF的混频信号频率，用于对使用不太理想的混频的上变频IF信号导致的频率误差进行预补偿。 在任一情况下，可以实现接收机/发射机，而不必提供用于在RF和IF之间转换信号的专用参考振荡器。

公开(公告)号：US20050163197A1

公开(公告)日：2005-07-28

申请号：US10766347

申请日：2004-01-28

申请人： Dennis Cleary ,  Hayim Penso ,  Christopher Zappala

发明人： Dennis Cleary ,  Hayim Penso ,  Christopher Zappala

IPC分类号： H03G3/20 ,  H04B1/707 ,  H04L27/08

CPC分类号： H03G3/3078 ,  H04B1/7097

摘要： A received analog spread-spectrum signal is selectively attenuated prior to digitization, where the amount of attenuation is based on the amplitude of the digitized signal before the digitized signal is filtered to compensate for interference that may exist in the received signal. By selectively attenuating the signal only when the digitized signal is relatively large, the receiver can be implemented using a relatively small analog-to-digital converter (ADC) than would otherwise be the case for a particular signal processing application. Taking advantage of the signal-concentration characteristics of spread-spectrum receivers, embodiments of the present invention can be designed to operate with signal having negative signal-to-noise ratios at the A/D conversion step.

摘要翻译： 在数字化之前，接收的模拟扩频信号被选择性地衰减，其中衰减量基于数字化信号被滤波之前的数字化信号的幅度，以补偿可能存在于接收信号中的干扰。 通过仅在数字化信号相对较大时选择性地衰减信号，可以使用比特定信号处理应用的情况下更小的模数转换器（ADC）来实现接收机。 利用扩频接收机的信号浓度特性，可以将本发明的实施例设计成在A / D转换步骤中具有负信噪比的信号进行操作。

公开(公告)号：US20050136877A1

公开(公告)日：2005-06-23

申请号：US10739549

申请日：2003-12-18

申请人： Dennis Cleary ,  Carmine Pagano ,  Hayim Penso ,  John Rucki

发明人： Dennis Cleary ,  Carmine Pagano ,  Hayim Penso ,  John Rucki

IPC分类号： H03D7/16 ,  H03J1/00 ,  H04B1/04 ,  H04B1/26 ,  H04B1/40 ,  H04B15/00 ,  H04L25/03

CPC分类号： H03J1/005 ,  H03D7/161

摘要： In a receiver of a transmission system in which the data transmission rate is not an integer multiple of the spacing between transmission channels, a single oscillator is used to generate both the system clock used to process the data signal as well as the mixing signal used to downconvert the received RF signal to an intermediate frequency (IF). The frequency error in the IF signal that results from mixing the RF signal at a less-than-ideal mixing frequency is compensated by selecting an appropriate mixing signal frequency applied when downconverting the IF signal to baseband. In a transmitter, the mixing signal frequency used to upconvert the outgoing baseband signal to IF is selected to pre-compensate for the frequency error resulting from upconverting the IF signal to RF using a less-than-ideal mixing frequency. In either case, the receiver/transmitter can be implemented without having to provide a dedicated reference oscillator for converting signals between RF and IF.

摘要翻译： 在其中数据传输速率不是传输信道之间的间隔的整数倍的传输系统的接收机中，使用单个振荡器来产生用于处理数据信号的系统时钟以及用于处理数据信号的混合信号 将所接收的RF信号下变频到中频（IF）。 通过选择在将IF信号下变频到基带时施加的适当的混频信号频率来补偿在不合理的混频时将RF信号混频所产生的IF信号中的频率误差。 在发射机中，选择用于将输出基带信号上变频到IF的混频信号频率，用于对使用不太理想的混频的上变频IF信号导致的频率误差进行预补偿。 在任一情况下，可以实现接收机/发射机，而不必提供用于在RF和IF之间转换信号的专用参考振荡器。