Preprocessing technology employed multi-carrier signal peak clipping device and method

Abstract

The invention discloses a multi-carrier signal peak-shaving device adopting preprocessing technology. The device includes a single-carrier peak-shaving unit for performing root-raised cosine shaping filtering, digital up-conversion and single-carrier Limiting and peak-cutting, and finally combine the signals after each single-carrier peak-cutting into multi-carrier signals; the multi-carrier combining and peak-cutting unit is used to perform multi-carrier limiting and peak-cutting, digital down-conversion and The baseband signal of each carrier is restored; the digital up-conversion unit is used to perform root-raised cosine shaping filtering and digital up-conversion after upsampling the baseband signal received by each carrier, and combine to form a multi-carrier combined signal after peak clipping and output. The invention also discloses a multi-carrier signal peak clipping method using preprocessing technology. By adopting the present invention, better peak-shaving effect can be obtained, mutual interference between different carriers can be reduced, and it is easier to realize by hardware.

Description

technical field [0001] The invention relates to the signal processing field of a multi-carrier communication system, in particular to a multi-carrier signal peak clipping device and method using preprocessing technology. Background technique [0002] With the development of communication technology, mobile communication has penetrated into thousands of households, and the demand for system capacity is increasing day by day. At the same time, the voice service can no longer meet the growing demand of people. It is urgent and practical to provide high-quality data service. [0003] In this context, time-division multiple access, code-division multiple access, and space-division multiple access technologies are introduced, but increasing frequency resources is still the most fundamental means of capacity expansion. Therefore, various communication systems such as WCDMA system, CDMA2000 system, TD-SCDMA system, etc., all need multiple carrier frequencies to increase the system c...

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Problems solved by technology

Although this method proposes a method with better performance based on various peak clipping methods, there are still four defects in this method: First, because all peak clipping in this method is completed based on multi-carrier signals, in In practice, if the power of multiple carriers is very unbalanced, some protocols require a dynamic of 30dB. At this time, the noise signal of the peak clipping will greatly interfere with the weak useful signal, resulting in serious deterioration of the indicators of the weak signal system; secondly, the method It is necessary to complete the extraction and processing of the noise signal and add it to the delayed original signal, which requires precise time synchronization and puts forward high requirements for real-time performance. ) increases the greater difficulty; again, the method of noise processing in this method is more effective for continuous multiple carrier processing, but if multiple carriers are discontinuously allocated, the noise processing method will inevitably cause the adjacent channel leakage index to be unsatisfied System requirements, so the use of this method is limited; finally, because this method is only based on multi-carrier peak clipping, the peak clipping capability is limited, and excessive peak clipping leads to the overall deterioration of the quality of the entire multi-carrier signal

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