This paper evaluates the error probability of the rectangular frequency pulse multi-h modulation (MHPM) scheme in slowly-fading, frequency-nonselective or frequency-selective Rician and Rayleigh channels. The evaluation is performed with a method combining analysis and computer simulation. Performance degradations are evaluated for various direct-to-reflected signal ratio, Doppler shifts, and r...

The focus of this chapter is to consider the case of spectral-slicing when Frequency-Shift Keying (FSK) is used as the modulation scheme. Although the majority of lightwave systems use conventional On-Off Keying (OOK) or intensity modulation, FSK is preferred in certain situations and this chapter will discuss where transmission using FSK may prove advantageous in the context of a noise-like sp...

This study evaluates the impact of underwater ambient noise using seven real noise samples; Dolphin, Rain, Ferry, Sonar, Bubbles, Lightning, and Outboard Motor in three frequency ranges in extremely low frequency (ELF) band. The ELF band is the most significant bandwidth for underwater long-range communication. ELF band which is extended from 3 to 3000 Hz clearly, faces bandwidth limitation. Me...

Silicon photonic waveguides are promising in small-footprint low-cost monolithic photonic integrated circuits with capability of high-yield mass production using large-diameter wafers. Design, fabrication and performance characterization of a small-footprint monolithic dualpolarization quadrature phase-shift keying silicon-based optical modulator for digital coherent communication, which plays ...

In orthogonal frequency division multiplexing (OFDM) systems with differential phase shift keying (DPSK), it is possible to apply differential modulation either in the time or frequency domain depending on the condition of fading channels, such as the Doppler frequency shift and the delay spread. This paper proposes a simple calculation method, that is, an approximate closed-form equation of th...

There is a great interest in secure communications within industry and various sectors of society. One common approach of achieving this is by encoding the information using shift-keying methods such as Binary Phase Shift Keying and Quadrature Phase Shift Keying. Proposed in this paper is a new robust yet simple multilevel differential chaotic shift-keying scheme. Compared with the schemes curr...

N.K. Askar, S.C. Lin, H.D. Pfister, G.E. Rogerson, and D.S. Furuno General Atomics, Photonics Division, 10240 Flanders Court, San Diego, California 92121 {naiel.askar, susan.lin, henry.pfister, gerald.rogerson, david.furuno}@gat.com Abstract. Spectral Keying (SK) is a novel UWB modulation scheme that combines properties of both Frequency Shift Keying and Pulse Position Modulation. An SK symbol...

The capacity and cutoff rate of frequency-shift keying (FSK) modulation and noncoherent reception when the signal is subject to Rician fading are calculated. Both hard and soft decisions with maximum likelihood combining are considered, as well as soft decisions with square-law combining. Optimal code rates are found that minimize the required signal-to-noise ratio for reliable communication.

This brief presents low-complexity detectors for a zero-IF Bluetooth receiver based on a simple phase-domain analog-to-digital converter. Measurements and simulations prove that the detectors’ sensitivity lies close to an ideal coherent Gaussian frequency-shift keying (GFSK) detector.