Analysis of Companding Techniques Applied to Onboard Telemetry Systems
In order to increase the dynamic range and the signal-to-quantization noise ratio (SQNR) of telecommunication systems, companding techniques were developed, such as the μ-law and the A-law. These techniques allow a non-uniform quantization of the signal using a compressor circuit followed by a uniform quantizer in the transmitter and the reconstruction of the original signal on the receiver by means of an expander circuit. Some types of signals monitored during the flight of sounding vehicles and satellite launchers have a very wide dynamic range. In this paper, we propose and analyze the use of companding techniques in order to improve the SQNR of onboard telemetry systems.
M. B. Lucks and H. A.C. Procópio, "Analysis of Companding Techniques Applied to Onboard Telemetry Systems", Applied Mechanics and Materials, Vol. 232, pp. 915-918, 2012