DSP-BASED VARIABLE APERTURE CODE GENERATION TECHNIQUE

摘要

Variable Aperture Coded (VAC) signals for VAC modulation are advantageously generated by a digital signal processor ( 12 ) that yields a VAC signal having a single narrow peak in the positive frequency region. A Discrete-Time Hilbert transformer ( 12 ) isolates only the positive spectral peaks, thus yielding a VAC signal that affords greater control over zero crossings.