Evaluating CMA Equalization of SOQPSK-TG for Aeronautical Telemetry
Technical paper, Mar 2013-Jun 2015
AIR FORCE TEST CENTER EDWARDS AFB CA
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This paper presents the results of using a constant modulus algorithm CMA to recover shaped offset quadrature-phase shift keying SOQPSK-TG modulated data, which has been transmitted using the iNET data packet structure. This standard is defined and used for aeronautical telemetry. Based on the iNET-packet structure, the adaptive block processing CMA equalizer can be initialized using the minimum mean square error MMSE equalizer. This CMA equalizer is being evaluated for use on iNET structured data, with initial tests being conducted on measured data which has been received in a controlled laboratory environment. Thus the CMA equalizer is applied at the receiver to data packets which have been experimentally generated in order to determine the feasibility of our equalization approach, and its performance is compared to that of the MMSE equalizer. Performance evaluation is based on computed bit error rate BER counts for these equalizers.