| 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> |
