Direct bandpass sampling of multiple distinct RF signals
Direct bandpass sampling of multiple distinct RF signals
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DOI：
10.1109/26.774848
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发表时间：
1999-07-01
影响因子：
8.3
通讯作者：
Caschera, J
中科院分区：
文献类型：
--
作者：
Akos, DM;Stockmaster, M;Caschera, J
软件无线电设计理念的一个目标是将模数转换器放置在尽可能靠近天线的位置。该目标已在单个输入信号的情况下得到证明。带通采样已应用于将射频 (RF) 信号的信息带宽下变频或有意混叠到所需的中频。当接收到两个或多个不同的信号时，软件无线电的设计变得更加有趣。多个信号的传统方法是对包含所有所需信号的连续频谱范围进行带通采样。这种方法的缺点是采样率和相关的离散处理率基于频谱的跨度，而不是感兴趣信号的信息带宽。这里提出了一种确定多个不相邻频带直接数字化的绝对最小采样频率的技术。整个过程基于单个参数——采样频率的计算。结果是一个简单而优雅的前端设计，用于多个 RF 信号的接收和带通采样。使用美国全球定位系统标准位置服务 (GPS-SPS) 和俄罗斯全球导航卫星系统 (GLONASS) 的 RF 传输的实验结果用于说明和验证该理论。
A goal in the software radio design philosophy is to place the analog-to-digital converter as near the antenna as possible. This objective has been demonstrated for the case of a single input signal. Bandpass sampling has been applied to downconvert, or intentionally alias, the information bandwidth of a radio frequency (RF) signal to a desired intermediate frequency. The design of the software radio becomes more interesting when two or more distinct signals are received, The traditional approach for multiple signals would be to bandpass sample a continuous span of spectrum containing all the desired signals. The disadvantage with this approach is that the sampling rate and associated discrete processing rate are based on the span of spectrum as opposed to the information bandwidths of the signals of interest,Proposed here is a technique to determine the absolute minimum sampling frequency for direct digitization of multiple, nonadjacent, frequency bands. The entire process is based on the calculation of a single parameter-the sampling frequency. The result is a simple, yet elegant, front-end design for the reception and bandpass sampling of multiple RF signals, Experimental results using RF transmissions from the U.S. Global Positioning System-Standard Position Service (GPS-SPS) and the Russian Global Navigation Satellite System (GLONASS) are used to illustrate and verify the theory.