  Quadrature amplitude modulation (QAM) and a complementary representation of a
causal waveform have been used to develop a sidelobe-free pulse-compression
technique. Envelopes of radio-frequency (RF) pulses under study include both
unimodal (Laplacian, Gaussian, rectangular) and bimodal (Hermite-Gaussian)
shapes. Although the achievable compression gain is small (~2), the generation
and phase-invariant correlation processing of such created compressible pulses
can be accomplished with the use of low-complexity systems.
