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REDUCED COMPLEXITY TRELLIS DETECTION OF SOQPSK-TGNelson, Tom 10 1900 (has links)
ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California / The optimum detector for shaped offset QPSK (SOQPSK) is a trellis detector which has high complexity (as measured by the number of detection filters and trellis states) due to the memory inherent in this modulation. In this paper we exploit the cross-correlated, trellis-coded, quadrature modulation (XTCQM) representation of SOQPSK-TG to formulate a reduced complexity detector. We show that a factor of 128 reduction in the number of trellis states of the detector can be achieved with a loss of only 0.2 dB in bit error rate performance as compared to optimum at P(b) = 10^(-5).
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COMMON DETECTORS FOR TIER 1 MODULATIONSNelson, Tom, Perrins, Erik, Rice, Michael 10 1900 (has links)
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada / The ARTM Tier 1 waveforms include two versions of Feher patented QPSK (FQPSK-B and
FQPSK-JR) and a version of shaped offset QPSK (SOQPSK-TG). In this paper we examine three
common detector architectures for the ARTM Tier 1 modulations: a symbol-by-symbol detector, a
cross correlated trellis coded modulation (XTCQM) detector, and a continuous phase modulation
(CPM) detector. We show that when used to detect Tier 1 modulations, these detectors perform
well even without knowledge of the modulation used by the transmitter. The common symbol-by-symbol
detector suffers a loss of 1.5 dB for SOQPSK-TG and 1.6 dB for FQPSK-JR in bit error
rate performance relative to the theoretical optimum for these modulations. The common XTCQM
detector provides a bit error rate performance that is 0.1 dB worse than optimum for SOQPSK-TG
and that matches optimum performance for FQPSK-JR. The common CPM detector achieves a
bit error rate performance that is 0.25 dB worse than optimum for SOQPSK-TG and that approximately
matches optimum for FQPSK-JR. The common XTCQM detector provides the best bit
error rate performance, but this detector also has the highest complexity.
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