On the Energy Efficiency of Orthogonal Signaling

Details On the Energy Efficiency of Orthogonal Signaling On the Energy Efficiency of Orthogonal Signaling

2008-12-09

arxiv.org/abs/0812.1780v1

Computer Science

Information Theory

appeared at ISIT 2008

Scientific paper

In this paper, transmission over the additive white Gaussian noise (AWGN) channel, and coherent and noncoherent fading channels using M-ary orthogonal frequency-shift keying (FSK) or on-off frequency-shift keying (OOFSK) is considered. The receiver is assumed to perform hard-decision detection. In this setting, energy required to reliably send one bit of information is investigated. It is shown that for fixed M and duty cycle, bit energy requirements grow without bound as the signal-to-noise ratio (SNR) vanishes. The minimum bit energy values are numerically obtained for different values of M and the duty cycle. The impact of fading on the energy efficiency is identified. Requirements to approach the minimum bit energy of -1.59 dB are determined.

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