A Comparison of Three Equalization Techniques for iNET-Formatted SOQPSK-TG

This paper demonstrates the effectiveness of the zero-forcing, minimum mean-squared error, and constant-modulus equalizers in improving the BER performance of iNET-formatted SOQPSK-TG. The equalization algorithms leverage the existence of known bit sequences in the preamble and ASM fields of the iNE...

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Bibliographic Details
Main Authors: Rice, Michael, Moazzami, Farzad, Saquib, Mohammad, Cole-Rhodes, Arlene
Format: Report
Language:English
Subjects:
AERONAUTICAL TELEMETRY
AIRBORNE
ALGORITHMS
BANDWIDTH
BER(BIT ERROR RATE)
EQUALIZATION ALGORITHMS
INET(INTEGRATED NETWORKED ENHANCED TELEMETRY)
Radio Communications
RADIO TELEMETRY
SET(SPECTRUM EFFICIENT TECHNOLOGY)
SIGNAL PROCESSING
SOQPSK-TG(TG VERSION OF SHAPED OFFSET QPSK DEFINED IN IRIG 106)
SPECTRUM
Telemetry
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Summary:This paper demonstrates the effectiveness of the zero-forcing, minimum mean-squared error, and constant-modulus equalizers in improving the BER performance of iNET-formatted SOQPSK-TG. The equalization algorithms leverage the existence of known bit sequences in the preamble and ASM fields of the iNET packet to realize data-aided equalizers. The effectiveness of these equalization techniques over ten test channels, derived from channel sounding experiments at Edwards AFB, was evaluated. The BER curves for nine out of the ten test channels display the desirable waterfall shape. The BER curve for the remaining test channel displays a BER floor. Fortunately, the BER floor is low enough to allow error correcting codes, such as the iNET LDPC code, to correct the errors and provide virtually error-free performance. Prepared in collaboration with Brigham Young University, Provo, UT; University of Texas at Dallas, Richardson, TX; and Morgan State University, Baltimore MD.