SPECTRAL SHAPING AND SYMBOL ERROR MITIGATION TECHNIQUES TO INJECT OFDM SUBCARRIERS INTO NAVIGATIONAL RADAR GUARD BANDS AND MAINLOBE FOR SPECTRUM SHARING
Authors
Parmentar, Michelle L.
Subjects
communications
interference
probability of detection
radar
spectrally-shaped waveform
spectrum sharing
spectrum management
symbol error rate
bit error rate
interference
probability of detection
radar
spectrally-shaped waveform
spectrum sharing
spectrum management
symbol error rate
bit error rate
Advisors
Romero, Ric
Date of Issue
2019-03
Date
March 2019
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
In this work, we investigate the effects of spectrally opportunistic shaped communications waveforms
impinging into the spectrum of a radar. To simulate the radar, we first use a Hamming-based spectral shape
and a more realistic spectrum from a commercial navigation (COMNAV) radar. The communications
system employs orthogonal frequency-division multiplexing (OFDM) with the subcarriers modulated by
quaternary phase-shift keying (QPSK). We utilize waterfilling, adhoc waterfilling inversion, and uniform
energy distribution techniques to shape the communications spectrum, fill the spectral tails (i.e., guard
bands), and even inject subcarriers into the radar bandwidth. Unsurprisingly, the high-powered radar
interferes with the communications signal such that the symbol error ratio (SER) is drastically degraded. In
addition to the spectral shaping techniques on transmit, we propose estimation and subtraction of the radar
interference from the interfered subcarriers. The combination results in SERs that are vastly improved, while
the radar probability of detection is minimally or slightly affected.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.