Multiple-access ultrawideband communications using frequency modulation of quasi-orthogonal impulse-like waveforms

• Published in: IET communications 2020-06, Vol.14 (10), p.1543-1553
• Main Authors: Shishter, Yousef M.H, Hussain, Malek G.M
• Format: Article
• Language: English
• Subjects: analytic expression; binary error probability; correlation coefficient; different signal model parameters; error probability curves; error statistics; fading channels; frequency modulation; frequency shift keying; frequency spectrum; impulse communications; impulse frequency shift keying; impulse phase shift keying; impulse‐carrier frequency; multiple access coding; multiple access communications; multiple access ultrawideband communications; M‐ary frequency‐shift; narrow band communications; noncoherent detection; phase shift keying; pulse position modulation; quasiorthogonal impulse‐like carrier waveforms; Rayleigh channels; Research Article; resultant signals; signal design; signal parameters; single‐user communications; ultra wideband communication
• ISSN: 1751-8628; 1751-8636; 1751-8636
• DOI: 10.1049/iet-com.2018.6100

This paper presents a detailed study of multiple access ultrawideband communications based on M-ary frequency-shift keying modulation of impulse-like carrier waveforms. The proposed signal model is described using expressions of duty cycle, energy, and correlation coefficient analytically derived and analyzed in terms of signal parameters. The frequency sets for coherent as well as non coherent detection utilized in narrow band communications are extended to impulse communications, and the resultant signals' correlation properties are investigated. Analytic expression of the frequency spectrum for continuous transmission is obtained, and a parametric study of the spectrum is carried out to analyze its properties. System performance analysis in terms of error probability curves is given for different signal model parameters. For single user communications, error probability curves for M-ary system are plotted using the union bound, while for multiple access communications, analytic expression of binary error probability in Rayleigh fading channel is given and plotted. The plots demonstrate the advantages of multiple access coding and signal design in improving system performance. Comparison between the bit error performance of impulse frequency shift keying, impulse phase shift keying, pulse position, and binary phase shift keying modulation schemes is presented too.