Crest Factor Reduction in Multi-carrier WCDMA Transmitters

Abstract:
This paper addresses the problem of crest factor reduction (CFR) in multi-carrier WCDMA systems. A trade-off analysis for design and optimization of the PAPR reduction algorithm within the context of the error vector magnitude (EVM) and adjacent channel leakage ratio (ACLR) quality metrics are studied. Statistical characteristics of the clipping noise are analyzed and a novel method for clipping the multi-band signal under the phase invariant constraint is proposed. Our study also includes mapping of the signal processing algorithms onto Xilinx Virtex-4(TM) field programmable gate array (FPGA) technology and addresses the device resource utilization and efficient hardware implementation of the above PAPR reduction algorithms onto the above mentioned device. Statistical simulations and performance assessments of the proposed algorithms are presented.