信道化主动消噪(CANE)抑制发射机互调

Rui Zhu, Yonghoon Song, Y. Wang
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引用次数: 3

摘要

射频发射机的线性度常常必须与其效率相权衡。高效率的工作通常要求发射机在深饱和或开关模式状态下工作。信号的非线性失真成分,如三阶互调(IM3)项,是导致误差矢量幅度(EVM)和相邻信道功率比(ACPR)水平增加以及传输信号完整性变差的主要原因。在本文中,我们提出了一种数字增强技术来抑制功率放大器(PAs)输出中的互调项,该技术称为信道化有源噪声消除(CANE)技术。CANE利用数字延迟基带信号驱动的多个PA通道组合形成有源FIR滤波器。FIR滤波器的抑制带可以放置在IM3出现的地方,实现互调抑制。类似的想法也可以扩展到多载波射频系统,在同一组硬件上为不同的载波形成多个软件定义的滤波器。测量结果表明,单载波信号的IM3抑制约为17dB,双载波信号的IM3抑制约为10dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Suppressing transmitter intermodulations with Channelized Active Noise Elimination (CANE)
The linearity of a RF transmitter must often be traded off with its efficiency. High efficiency operation often requires the transmitter to operate in a deep saturation or a switching-mode state. The non-linear distortion components of the signal such as the Third-Order Intermodulation (IM3) terms are the primary causes of the increased Error Vector Magnitude (EVM) and Adjacent Channel Power Ratio (ACPR) level and poorer transmitted signal integrity. In this paper, we proposed a digitally enhanced technique to suppress the intermodulation terms in the output of the power amplifiers (PAs), which is called Channelized Active Noise Elimination (CANE) technique. CANE utilizes the combining of multiple PA channels driven with digitally delayed baseband signal to form an active FIR filter. The rejection band of the FIR filter can be placed where the IM3 appears to realize intermodulation suppression. Similar idea can also be extended to a multi-carrier RF system, with multiple software defined filters formed for different carriers on the same set of hardware. Measurements have shown about 17dB IM3 suppression for a single carrier and 10dB IM3 suppression for a two-carrier signal.
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