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An Analysis of a Low Complexity Received Signal Strength Indicator for Wireless Applications

An Analysis of a Low Complexity Received Signal Strength Indicator for Wireless Applications,Peter Singerl,Christian Vogel

An Analysis of a Low Complexity Received Signal Strength Indicator for Wireless Applications  
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Wireless communication receivers work with radio frequency (RF) input signals with a huge dynamic range of 50dB and more. In order to provide the analog-to-digital converters (ADCs) in the receivers with an optimal signal strength, the gains of the RF and IF (intermediate frequency) stages have to be tuned according to the strength of the RF input signal. The RF input signal strength can be estimated with a Received Signal Strength Indicator (RSSI), which is investigated in this paper. Starting from a well known estimation scheme, we develop a RSSI with very low circuit complexity and show how this RSSI has to be calibrated in order to work properly for the class of Gaussian distributed input signals. The analyzed RSSI architecture consists of a simple logarithmic amplifier and a first-order low-pass filter in the continuous time domain and a scaling and offset correction in the discrete time domain.
Published in 2004.
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