Frequency-Selective High-Order Phase Shift Keying

Abstract

This paper presents a candidate arbitrary-phase spread spectrum modulation technique that offers similar performance to spread continuous phase modulation (CPM) waveforms, yet supports additional capabilities for programming a chosen frequency domain spectra into the resulting spread spectrum signal. The proposed frequency-selective high-order phase shift keying (PSK) signaling (FS-HOPS) waveform is derived from arbitrary-phase sequence-based spread spectrum signals, with multi-bit resolution chaos-based sequences defining incremental phase words, enabling real-time efficient generation of practically non-repeating waveforms. The result of the FS-HOPS formulation is a parameterized hybrid modulation capable of selectively mitigating narrowband interference. Adaptation in this modulation may be easily implemented as a time-varying evolution, increasing the security of the waveform against tone jammers, while retaining many efficiently implementable receiver design characteristics of standard PSK modulations.