Multipath Suppression for Continuous Wave Radar via Slepian Sequences In continuous wave (CW) radar systems, multiple signal copies impinge the receiver simultaneously. Often, undesired multipath and directpath copies are many times stronger than potential targets. When applying matched filter signal processing techniques, the undesired signal components can mask weaker targets and decrease performance of postprocessing techniques, such as target indication or estimation. In this manuscript, we propose a method of rejecting multipathscattered returns over a continuous region in range and Doppler. We explore the computational cost of this method and additionally propose an approximate method of rejection which leverages the wellknown discrete prolate spheroidal sequences (DPSS)xe2x80x93typically referred to as Slepian sequencesxe2x80x93to gain a computational advantage. Results are shown to decrease the effective noise floor when applying matched filtering techniques as well as increase target signaltointerferenceplusnoise ratio (SINR) outside of an undesired multipath region. Comparisons are shown to traditional CW multipath removal in terms of rejection performance and runtime.

Extended Logarithmic Frequency Domain Rulers for Joint RadarCommunications This paper studies the design and performance of a new class of Doppler estimation capable waveforms called Extended Logarithmic Frequency Domain Rulers (ELFDRs) for joint radarcommunications. ELFDRs are multicarrier waveforms whose carriers are spaced according to an Extended Golomb Ruler after a logarithmic warping of the frequency axis. The multiplicative Doppler shift additively translates the waveformxe2x80x99s logarithmically warped spectrum, which allows simultaneous signal detection and Doppler shift estimation via convolutional matched filtering of the logarithmically warped power spectrum. We propose to use these waveforms for communications by phase modulating the carriers and using the estimated Doppler shift to adjust a pilot tone time domain matched filter for fine symbol synchronization. The synchronized waveform is then sent to a communications module for symbol decoding. This paper gives an example of these waveforms, details their design, illustrates a receiver, and explores their bit error rate in AWGN and multipath.