Coherent frequency∕phase modulation scheme

Hung, Fu-Chuan; Chung, Char-Dir; Chao, Yi-Ling

doi:10.1049/ip-com:20020165

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…In this section, we consider joint frequency and phase modulation to improve the power efficiency of communication with OOFSK signaling. Combining phase and frequency modulation techniques has been proposed in the literature (see e.g., [20], [21], [22], and [23]). As we have seen in the previous section, if the receiver employs energy detection and the peak-to-average power ratio is limited, then operating at very low SNR is extremely power inefficient.…”

Section: Capacity Of M -Ary Oofpsk Signalingmentioning

confidence: 99%

On-Off Frequency-Shift Keying for Wideband Fading Channels

Gursoy

Poor

Verdú

2006

J Wireless Com Network

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M-ary On-Off Frequency-Shift-Keying (OOFSK) is a digital modulation format in which M-ary FSK signaling is overlaid on On/Off keying. This paper investigates the potential of this modulation format in the context of wideband fading channels. First it is assumed that the receiver uses energy detection for the reception of OOFSK signals. Capacity expressions are obtained for the cases in which the receiver has perfect and imperfect fading side information.Power efficiency is investigated when the transmitter is subject to a peak-to-average power ratio (PAR) limitation or a peak power limitation. It is shown that under a PAR limitation, it is extremely power inefficient to operate in the very low SNR regime. On the other hand, if there is only a peak power limitation, it is demonstrated that power efficiency improves as one operates with smaller SNR and vanishing duty factor. Also studied are the capacity improvements that accrue when the receiver can track phase shifts in the channel or if the received signal has a specular component. To take advantage of those features, the phase of the modulation is also allowed to carry information.

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Section: Capacity Of M -Ary Oofpsk Signalingmentioning

confidence: 99%

On-Off Frequency-Shift Keying for Wideband Fading Channels

Gursoy

Poor

Verdú

2006

J Wireless Com Network

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Optical gas sensing: a review

Hodgkinson

Tatam

2012

Meas. Sci. Technol.

1,357

858

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The detection and measurement of gas concentrations using the characteristic optical absorption of the gas species is important for both understanding and monitoring a variety of phenomena from industrial processes to environmental change. This article reviews the field, covering several individual gas detection techniques including non-dispersive infrared (NDIR), spectrophotometry, tunable diode laser spectroscopy and photoacoustic spectroscopy. We present the basis for each technique, recent developments in methods and performance limitations. The technology available to support this field, in terms of key components such as light sources and gas cells, has advanced rapidly in recent years and we discuss these new developments. Finally, we present a performance comparison of different techniques, taking data reported over the preceding decade, and draw conclusions from this benchmarking.

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