公开(公告)号：US09755583B2

公开(公告)日：2017-09-05

申请号：US15026324

申请日：2014-10-01

Applicant: Nokia Solutions and Networks Oy

Inventor： Shavantha Kularatna ,  Christian Reichl ,  Bjoern Jelonnek ,  Alan Pereira ,  Glenn Schedeen ,  Sandeep Mehta

IPC: H04B1/04 ,  H03F1/32 ,  H03F3/19 ,  H03F3/24 ,  H03F3/195 ,  H03F3/21 ,  H03F3/213 ,  H04B1/40

CPC classification number: H03F1/3247 ,  H03F1/02 ,  H03F3/19 ,  H03F3/195 ,  H03F3/21 ,  H03F3/213 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2201/3227 ,  H04B1/0475 ,  H04B1/40 ,  H04B2001/0416 ,  H04B2001/045

Abstract: Enhancing the intermodulation performance of an RF power amplifier by determining a coarse time delay represented by an integer TI; determining a reference point for a transmitted signal waveform of the RF power amplifier; shifting the waveform by a set of offsets including a plurality of non-integer fractional steps; correlating the transmitted signal waveform with a feedback signal waveform to obtain a respective correlation value for each of corresponding fractional steps; obtaining an accurate fractional delay value by selecting a fractional step having a highest respective correlation value; applying the obtained correct fractional delay value to the transmitted signal waveform to provide a compensated transmitted signal waveform and combining the compensated transmitted signal waveform with the feedback signal waveform to reduce at least one intermodulation product of the RF power amplifier.

公开(公告)号：US09226189B1

公开(公告)日：2015-12-29

申请号：US14462035

申请日：2014-08-18

Applicant: Nokia Solutions and Networks Oy

Inventor： Shavantha Kularatna ,  Christian Reichl ,  Bjoern Jelonnek ,  Alan Pereira

IPC: H04W24/10 ,  H04B17/17

CPC classification number: H04B17/17

Abstract: At a current time, a current intermodulation content of a predistortion system is determined. An intermodulation ratio is determined using the current intermodulation content and a previous intermodulation content for the predistortion system. The previous intermodulation content is determined at a time previous to the current time. The determined intermodulation ratio is compared with stored intermodulation ratios. A warning is communicated in response to the comparing indicating the predistortion system is unhealthy. Apparatus and computer program products are also disclosed.

Abstract translation: 在当前时间，确定预失真系统的当前互调内容。 使用当前的互调内容和用于预失真系统的先前的互调内容来确定互调比。 先前的互调内容是在当前时间之前的时间确定的。 将确定的互调比与存储的互调比进行比较。 响应于比较表示预失真系统是不健康的，通知警告。 还公开了装置和计算机程序产品。