公开(公告)号：US09344122B1

公开(公告)日：2016-05-17

申请号：US14465498

申请日：2014-08-21

Applicant: L-3 COMMUNICATIONS CORP.

Inventor： Osama S. Haddadin ,  Roy E. Prymek ,  William K. McIntire

IPC: H04B1/10 ,  H04B1/52 ,  H04B1/525 ,  H04B1/04 ,  H04L25/03

CPC classification number: H04B1/10 ,  H03F1/32 ,  H03F3/189 ,  H03F3/245 ,  H03F2200/294 ,  H04B1/0475 ,  H04B1/525 ,  H04B17/391 ,  H04L25/03019

Abstract: Adaptive filtering is used to substantially cancel distortion in radio frequency (RF) signals. Such adaptive filtering can be used in an RF transmitting module to pre-compensate an RF signal with compensation (inverse) distortion to cancel inherent transmission path distortion from the RF signal. Adaptive filtering can also be used in a multi-carrier RF receiving module to cancel from a given carrier signal distortion due to cross talk from adjacent carrier signals. Adaptive filtering in an RF transceiver can be used to cancel from a received RF signal distortion arising from leakage of a transmit signal into the receive path.

Abstract translation: 自适应滤波用于基本上消除射频（RF）信号中的失真。 这种自适应滤波可以用在RF发射模块中，以用补偿（反向）失真对RF信号进行预补偿，以消除来自RF信号的固有传输路径失真。 自适应滤波也可以用在多载波RF接收模块中，以从给定的载波信号中消除由于相邻载波信号的串扰引起的失真。 RF收发器中的自适应滤波可用于从发射信号泄漏到接收路径中的接收到的RF信号失真中消除。

公开(公告)号：US08963608B1

公开(公告)日：2015-02-24

申请号：US14267391

申请日：2014-05-01

Applicant: L-3 Communications Corp.

Inventor： June Y. Sun ,  William K. McIntire

IPC: H03K5/08

CPC classification number: H04L27/2623 ,  H04B2201/70706

Abstract: The peak-to-average power ratio of an input signal can be reduced prior to amplification. This reduction in the peak-to-average power ratio can be accomplished without adding significant intermodulation distortion to the input signal. The resulting input signal can therefore have a peak-to-average power ratio that does not exceed the output backoff of the amplifier thereby preventing the amplifier from being operated in saturation and, as a result, minimizing the intermodulation distortion added by the amplifier. The peak-to-average power ratio of an input signal can be reduced using two stages of signal clipping. By employing two stages, the intermodulation distortion introduced to the input signal as it passes through the stages is minimized. Also, because this two-stage approach does not attempt to account for intermodulation distortion introduced by the downstream amplifier, it can be implemented without any prior knowledge of the amplifier's transfer function or any output monitoring scheme.

Abstract translation: 输入信号的峰均功率比可以在放大之前降低。 可以实现峰均功率比的这种降低，而不会对输入信号增加显着的互调失真。 因此，所得到的输入信号可以具有不超过放大器的输出回退的峰均功率比，从而防止放大器在饱和状态下操作，并且因此使由放大器添加的互调失真最小化。 可以使用两级信号削波来降低输入信号的峰均功率比。 通过采用两级，当输入信号通过级时引入的互调失真最小化。 而且，由于这种两级方法并不试图解释由下游放大器引入的互调失真，所以可以在没有放大器传递函数或任何输出监视方案的任何先验知识的情况下实现。