Adaptive and Robust Digital Harmonic-Reject Mixer With Optimized Local Oscillator Spacing
Adaptive and Robust Digital Harmonic-Reject Mixer With Optimized Local Oscillator Spacing
复制标题
具有优化本地振荡器间距的自适应鲁棒数字谐波抑制混频器
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
W. Namgoong
中科院分区：
文献类型：
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作者：
W. Namgoong
谐波抑制混频器 (HRM) 通常用于宽带接收器中，以抑制寄生谐波干扰源的影响。文献中已经提出了模拟和数字HRM。在现有的工作中，假设本地振荡器（LO）相位是等距的。当被视为多用户接入系统时，等距LO相位的缺点是所需信号和一些谐波干扰源的特征向量变得对齐，从而限制了可以衰减的干扰源的数量。本文描述了一种具有非均匀相位间隔的数字 HRM，它可以抑制附加谐波，同时对增益和相位失配具有鲁棒性。本文还提出了一种低复杂度、自适应且鲁棒的数字 HRM 接收器，可根据低功耗的干扰环境实现所需的最少 LO 和模数转换器。自适应非均匀间隔 HRM 的性能明显优于具有相等 LO 相位间隔的现有 HRM。
Harmonic-reject mixers (HRM) are commonly used in wideband receivers to suppress the effects of spurious harmonic interferers. Both analog and digital HRMs have been proposed in the literature. In existing works, the local oscillator (LO) phases are assumed to be equally spaced. When viewed as a multiuser access system, the drawback of equally-spaced LO phases is that the signature vectors of the desired signal and some harmonic interferers become aligned, limiting the number of interferers that can be attenuated. In this paper, a digital HRM with non-uniform phase spacing that can suppress additional harmonics while being robust to gain and phase mismatches is described. This paper also presents a low-complexity, adaptive and robust digital HRM receiver that enables the fewest LOs and analog-to-digital converters necessary depending on the interference environment for low power. The performance of the adaptive non-uniformly spaced HRM is shown to be significantly superior to existing HRMs with equal LO phase spacing.