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：US20050040887A1

公开(公告)日：2005-02-24

申请号：US10646058

申请日：2003-08-22

申请人： Christopher Zappala

发明人： Christopher Zappala

IPC分类号： H03F1/32 ,  H03F1/26

CPC分类号： H03F1/32 ,  H03F1/3241 ,  H03F1/3282

摘要： A power amplifier's complex pre-distortion curve is generated by decomposing a representation of an input signal, processing the resulting decomposed signals using analog techniques, and performing signal re-composition. In one implementation, two different halves of a transfer function corresponding to the amplitude characteristics of the amplifier are separately modeled and then combined to generate a control signal used to control a voltage-controlled attenuator that attenuates the input signal, while two different halves of a transfer function corresponding to the amplifier's phase characteristics are separately modeled and then combined to generate a different control signal used to control a voltage-controlled phase shifter that adjusts the phase of the input signal. The resulting output signal corresponds to an amplitude-and-phase pre-distorted signal that can be applied to linearize a corresponding (high power) amplifier.

摘要翻译： 通过分解输入信号的表示，使用模拟技术处理所得到的分解信号，并执行信号重组，产生功率放大器的复合预失真曲线。 在一个实现中，对应于放大器的幅度特性的传递函数的两个不同的两半被分别建模，然后被组合以产生用于控制衰减输入信号的电压控制衰减器的控制信号，而两个不同的一半 对应于放大器的相位特性的传递函数被分别建模，然后组合以产生用于控制调节输入信号的相位的电压控制移相器的不同控制信号。 所得到的输出信号对应于可应用于线性化相应（大功率）放大器的幅相和相位预失真信号。