数字接收机动态范围研究

Y. Poberezhskiy
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引用次数: 24

摘要

数字接收机的动态范围由其模拟和混合信号部分(AMP)决定。在表征接收机动态范围的参数中,单音动态范围和双音动态范围通常是最重要的。动态范围上限的最终值受限于接收机AMP的可接受功耗。由于扩大动态范围通常会显著增加接收机功耗,因此计算所需最小动态范围的能力非常重要。本文讨论了该问题的一种封闭解的方法。本文讨论的另一个问题是如何实现数字接收机的最大动态范围。这需要结合使用众所周知的和新颖的动态范围改进方法。方法包括合理选择接收机采样频率,在采样时对信号能量进行滤波和利用,减小量化步长,增加接收机A/D有效位元数,尽可能抑制离天线较近的最强干扰信号等。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On Dynamic Range of Digital Receivers
Dynamic range of a digital receiver is determined by its analog and mixed signal portion (AMP). Among parameters that characterize the receiver dynamic range, single-tone dynamic range and two-tone dynamic range are usually most important. The ultimate value of the dynamic range upper bound is limited by acceptable power consumption of the receiver AMP. Since expanding the dynamic range usually significantly increases the receiver power consumption, ability to calculate the minimum required dynamic range is very important. An approach to a closed-form solution of the problem is discussed in this paper. Another problem discussed in the paper is achieving the maximum potential dynamic range of a digital receiver. This requires combined use of both well-known and novel methods of dynamic range improvement. The methods include proper selection of the receiver sampling frequency, filtering and utilization of the signal energy during sampling, reduction of the quantization step and increase in the effective number of bits in the receiver A/D, rejection of the strongest interfering signal as close as possible to the antenna, etc.
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