Optimal Linear Detection of Signals in Cyclostationary, Linearly Modulated, Digital Communications Interference

Both economic incentives and policy trends motivate the study of spectrum sharing between radar and wireless communications as a means to mitigate spectrum scarcity. This paper proposes a novel, temporal signal processing algorithm for a radar to mitigate interference from cyclostationary, linearly...

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Bibliographic Details
Published in:IEEE transactions on aerospace and electronic systems Vol. 55; no. 3; pp. 1123 - 1145
Main Authors: Zilz, David P., Bell, Mark R.
Format: Journal Article
Language:English
Published: New York IEEE 01.06.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Code Division Multiple Access
Correlation
Cyclostationarity
detection
Detectors
frequency-shift (FRESH) filtering
Incentives
Interference
interference cancelation
Matched filters
multiuser detection
OFDM
Orthogonal Frequency Division Multiplexing
Radar
Receivers
Signal processing
spectrum sharing
statistical deflection
whitening
Wireless communication
Wireless communications
ISSN:0018-9251, 1557-9603
Online Access:Get full text
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Summary:Both economic incentives and policy trends motivate the study of spectrum sharing between radar and wireless communications as a means to mitigate spectrum scarcity. This paper proposes a novel, temporal signal processing algorithm for a radar to mitigate interference from cyclostationary, linearly modulated digital communications (LMDC) interference such as orthogonal frequency division multiplexing (OFDM) or code division multiple access (CDMA). The proposed algorithm has the form of a novel whitening filter followed by a matched filter, and as such it optimizes the statistical deflection among the class of all linear detection filters. The derived cyclostationary whitening filter has equivalent mathematical representations as: 1) the form of a multiuser detector followed by an interference canceler, and 2) a frequency-shift (FRESH) filter. Performance results indicate that the derived cyclostationary whitener can produce signal-to-interference-plus-noise ratio (SINR) improvements ranging from negligible to up to <inline-formula><tex-math notation="LaTeX">\text{20 dB}</tex-math></inline-formula> for the parameters used in this study. The cyclostationary whitener leads to the greatest SINR improvements when the interference-plus-noise is dominated by only a few LMDC signals, such as might occur in a near-far scenario.
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ISSN:0018-9251
1557-9603
DOI:10.1109/TAES.2019.2893785