System and method for cutting peak of preprocess discontinuousness allocating multiple carrier waves

Abstract

The invention provides a peak clipping system for pretreating discontinuous arrangement multicarrier and a method thereof. The system includes a figure up-conversion device having multilevel interpolation filter and a peak clipping device, wherein the peak clipping device is arranged between arbitrary two-stage interpolation filter. The method includes carrying through the medium frequency process on the baseband carrier, and processing peak clipping between arbitrary two stages with multilevel interpolation. The project of the invention realizes the single peak clipping on each baseband carrier, thereby the carrier frequency point can be arranged arbitrarily in a certain frequency range when mixing; the peak clipping device is in the middle of the up-conversion channel, with low data rate, wide signal bandwidth, easy design, which can preferably restrain the noise out of the signal range and ensure the near channel leakage power ration of the transmitter without great change.

Description

technical field [0001] The invention relates to the field of 3G (3rd Generation, third generation wireless communication) communication, in particular to a system and method for eliminating peak signal power in the front-end intermediate frequency digital signal processing part of a power amplifier in WCDMA and CDMA2000 communication systems. Background technique [0002] The current 3G wireless communication systems all use QPSK, 8PSK, 16QAM, 64QAM and other modulation methods with high spectrum utilization. These modulation methods modulate the phase and amplitude of the carrier, so the instantaneous power of the output signal will be larger. The fluctuation produces a non-constant envelope modulation signal with a large peak-to-average ratio PAPR (Peak to Average Power Ratio, the ratio of peak power to average power). [0003] In addition, in the cell of the multi-carrier communication system, since the multi-carrier signals to be transmitted will be linearly superimposed...

AI Technical Summary

Problems solved by technology

This adds two frequency mixing on the hardware, the hardware overhead is very large, and the data rate of the signal is high when the signal is clipped, the signal bandwidth is very narrow, the shaping filter is difficult to design, and it is difficult to guarantee the signal after clipping The ACLR and EVM (Error Vector Magnitude, error vector magnitude)

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