Application of Dual M-ary Orthogonal Spread Spectrum in HF Communication System

Dual M-ary Orthogonal Spread Spectrum is a spetrum-spreading technology high spectrum efficiency,while HF(High Frequency) communication plays an important role in the field of communications.This paper describes basic principles of Dual M-ary Orthogonal Spread Spectrum system,and gives low data-rate 75 b/s waveforms in MIL-STD-188-110B of US active military specification.A HF low rate-data waveform based on Dual M-ary Orthogonal Spread Spectrum is proposed and designed,and simulation and comparison on the proposed waveforms and the low data-rate 75 b/s waveform in MIL-STD-188-110B indicate that the BER performance of the improved waveform is much better than that of MS 110B 75 b/s waveform in AWGN and fading channels.