| 摘要 |
<p>The present invention relates to an apparatus for reducing peak power in a transmitter for use in telecommunications systems. The invention also relates to a method for reducing peak power in a transmitter for use in telecommunications system and to a base station including such an apparatus. An apparatus according to the invention includes n subsequent interconnected stages (10), where n is larger than or equal to 2; and where each stage (10) of said n stages has an input main signal (1) and an output main signal (2). Each stage of said apparatus further includes an extractor (30) for extracting an overshooting part or peaks (31) of the input main signal (1) based on a predetermined clipping level; a filter (50) having a frequency response, for generating a filtered overshooting part signal (51) wherein the frequency response on at least one reserved frequency of at least one of said n stages (10) is smaller than the frequency response on said at least one reserved frequency of a previous stage and a combiner (70) arranged to generate the output main signal (2) by subtracting the filtered overshooting part signal (51) from a delayed version (61) of the input main signal (1).</p> |
