Studying OFMD with Amplitude-Phase Shift-keying Pulse-Amplitude Subcarrier Modulation and 10 bit/s/Hz spectral efficiency

Аuthors

Kuznetsov V. S.^1*, Volkov A. S.^2**, Solodkov A. V.^2***, Slepov A. V.^3****

1. National Research University of Electronic Technology, 1, sq. Shokina, Moscow, Zelenograd, 124498, Russia
2. National Research University of Electronic Technology, Bld. 1, Shokin Square, Zelenograd, Moscow, Russia, 124498
3. Company Research and Production Center "Elvis", pass 4922, building 4, p. 2, Moscow, Zelenograd, 124498, Russia

*e-mail: vitaliy_kuznetsov@hotmail.com
**e-mail: leshvol@mail.ru
***e-mail: solodkov_aw@mail.ru
****e-mail: shurik_slepov@mail.ru

Abstract

The presented work suggests a new modulation process, based on amplitude-phase modulation, with introduction of additional data transfer channel with amplitude modulation into quadrature to the transmitted signal with the amplitude-phase modulation. The OFDM system employing the suggested amplitude-phase amplitude-pulse modulation as a primary modulation method with frequency effectiveness of 10 bit/sample was considered.

Due to the quadrature modulation and demodulation scheme, with 8 amplitude levels of phase-shift keyed signal and 16 levels of a signal with amplitude-pulse modulation this method ensures frequency effectiveness in the output bandwidth up to the value of γ_PM-APM = 20 bit/s/Hz.

Additional advantages of this new proposed quadrature discrete modulation method consist in its high reliability while one of the modulation blocks failure, as well as its successful operation while phase inversion of the carrier recovered synchronization. Amplitude-phase modulation was selected as a prototype of the suggested modulation method.

A simulation model of a data transmission system with the given modulation method and OFDM technology was developed for studying the method of primary amplitude-phase amplitude-pulse modulation with selected effectiveness, surpassing the traditionally employed modulation methods in OFDM mode.

The simulation results allowed obtain experimental dependencies of the bit error caused by the signal to noise ratio conforming the analytical computation. The signal constellations of the amplitude-phase amplitude-pulse modulated signal, which shapes corresponded to the shape of the modulation type described by the author were obtained as well. The spectrum of the amplitude-phase amplitude-pulse modulated signal and OFDM signal were plotted. The spectrum effectiveness of the method, which also conformed with the theoretical computation, was obtained using the graph of the amplitude-phase amplitude-pulse modulated spectrum.

The required signal/noise ratio in the channel with additive Gauss white noise can be evaluated for the system functioning at the permissible error level by the dependence of the bit error probability, obtained while the system modelling. Thus, for the error level of 10^–6 the required signal/noise energy ratio is 36.5 dB. The graph of power peak-factor distribution of the OFDM signal was obtained. The distribution appears the same as when the phase keying modulation used as a primary modulation. It is explained by the fact, that the main parameter affecting the distribution shape and peak-factor value is the number of subcarriers in the OFDM signal.

Keywords:

quadrature amplitude modulation, phase keying modulation, pulse amplitude modulation, amplitude phase keying modulation, spectral efficiency, OFDM, signal constellation, discrete modulation

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