On Matching Strategies for Wireless Receivers
On Matching Strategies for Wireless Receivers
复制标题
无线接收机的匹配策略探讨
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
B. Lankl
中科院分区：
文献类型：
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作者：
Bernhard Lehmeyer;M. Ivrlac;A. Mezghani;J. Nossek;B. Lankl
功率匹配和噪声匹配是公知的已建立的方法，尽管它们不是用于设计最佳接收机的唯一策略。如果最佳SNR是设计目标，则显然噪声匹配是选择，而为了获得最高信号电平，必须选择功率匹配。事实上，两种策略的天线和商用低噪声放大器（LNA）之间的匹配两个端口是完全不同的。虽然对于功率匹配，来自天线的所有可用功率将被LNA吸收和放大，但是对于噪声匹配，可能相当大部分的可用功率将被反射。在后一种情况下，LNA的输出端处的SNR将是上级的，但是以降低的信号电平为代价。但是，接收器模拟部分末端的ADC需要一定的信号电平才能正常工作。因此，两种通用策略之间的折衷方案（称为“灵敏度匹配”）可能是最佳方法。
Power matching and noise matching are well known established approaches, though they are not the only strategies for designing an optimal receiver. If the best SNR is the design goal, then obviously noise matching is the choice, while for obtaining the highest signal level, power matching has to be chosen. In fact the matching two port between the antenna and a commercial low noise amplifier (LNA) for both strategies turns out to be quite different. While for power matching all the power available from the antenna will be absorbed and amplified by the LNA, for noise matching a possibly considerable part of the available power will be reflected. The SNR at the output of the LNA will be superior in the latter case, but at the expense of a reduced signal level. But an ADC at the end of the analog part of the receiver needs a certain signal level to work properly. Therefore a compromise between the two general purpose strategies, which will be called "Sensitivity matching", may be the optimum approach.