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Proceedings Paper

Modified CRLB on the modulation parameters of a QAM signal
Author(s): Liang Hong; King C. Ho
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Paper Abstract

When the characteristics of a digitally modulated signal are not known, the estimation of its modulation parameters is crucial for many emitter interception applications. This paper presents the Modified Cramer-Rao Lower Bound (M-CRLB) on the modulation parameters of a QAM signal embedded in AWGN. The modulation parameters considered are the carrier frequency, carrier phase, signal amplitude and symbol time. The M-CRLB results indicate that the carrier frequency has the highest estimation accuracy, followed by the symbol time, the signal amplitude and the carrier phase. The M-CRLBs of the four parameters are affected by the modulation level and the pulse shaping function. When the modulation level increases, the estimation accuracy decreases. When a raised cosine pulse shaping filter is used, the M-CRLBs on the four parameters all increase as the raised cosine roll-off factor increases. For lowpass pulse shaping filter, the M-CRLB on the symbol time decreases as the filter bandwidth increases. However, the M-CRLBs on the other three parameters increase.

Paper Details

Date Published: 28 August 2001
PDF: 8 pages
Proc. SPIE 4395, Digital Wireless Communication III, (28 August 2001); doi: 10.1117/12.438283
Show Author Affiliations
Liang Hong, Univ. of Missouri/Columbia (United States)
King C. Ho, Univ. of Missouri/Columbia (United States)

Published in SPIE Proceedings Vol. 4395:
Digital Wireless Communication III
Raghuveer M. Rao; Soheil A. Dianat; Michael D. Zoltowski, Editor(s)

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