Elements of information theory
Elements of information theory
On-off frequency-shift keying for wideband fading channels
EURASIP Journal on Wireless Communications and Networking
Wireless Communications & Networking
Wireless Communications & Networking
Error rate analysis for peaky signaling over fading channels
IEEE Transactions on Communications
Noncoherent Rician fading Channel-part II: spectral efficiency in the low-power regime
IEEE Transactions on Wireless Communications
Fading channels: how perfect need "perfect side information" be?
IEEE Transactions on Information Theory
Spectral efficiency in the wideband regime
IEEE Transactions on Information Theory
How Good Is PSK for Peak-Limited Fading Channels in the Low-SNR Regime?
IEEE Transactions on Information Theory
Channel Coherence in the Low-SNR Regime
IEEE Transactions on Information Theory
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The central design challenge in next generation wireless systems is to have these systems operate at high bandwidths and provide high data rates while being cognizant of the energy consumption levels especially in mobile applications. Since communicating at very high data rates prohibits obtaining high bit resolutions from the analog-to-digital (A/D) converters, analysis of the energy efficiency under the assumption of hard-decision detection is called for to accurately predict the performance levels. In this paper, transmission over the additive white Gaussian noise (AWGN) channel, and coherent and noncoherent fading channels is considered, and the impact of hard-decision detection on the energy efficiency of phase and frequency modulations is investigated. Energy efficiency is analyzed by studying the capacity of these modulation schemes and the energy required to send one bit of information reliably in the low signal-to-noise ratio (SNR) regime. The capacity of hard-decision-detected phase and frequency modulations is characterized at low SNR levels through closed-form expressions for the first and second derivatives of the capacity at zero SNR. Subsequently, bit energy requirements in the low-SNR regime are identified. The increases in the bit energy incurred by hard-decision detection and channel fading are quantified. Moreover, practical design guidelines for the selection of the constellation size are drawn from the analysis of the spectral efficiency-bit energy tradeoff.