Dispersive and dispersive-like bores in channels with sloping banks

A dispersive model for undular bores

In this article, consideration is given to weak bores in free-surface flows. The energy loss in the shallow-water theory for an undular bore is thought to be due to upstream oscillations that carry away the energy lost at the front of the bore. Using a higher-order dispersive model equation, this expectation is confirmed through a quantitative study which shows that there is no energy loss if d...

Doubly–Dispersive WSSUS Channels

Optimal link adaption to the scattering function of wide sense stationary uncorrelated scattering (WSSUS) mobile communication channels is still an unsolved problem despite its importance for next-generation system design. In multicarrier transmission such link adaption is performed by pulse shaping which in turn is equivalent to precoding with respect to the second order channel statistics. In...

Wireless Communication over Dispersive Channels

Automatic Digital Modulation Identification in Dispersive Channels

Automatic modulation type identification (AMTI) has seen increasing demand for both military and civilian, nowadays. Most of previous methods have been proposed on classification of modulations in additive white Gaussian noise (AWGN) channels. However in real world scenarios, communication channels suffer from dispersion (fading). This paper proposes a novel automatic digital modulation types i...

Fractional Fourier Transform Based OFDMA for Doubly Dispersive Channels

The performance of Orthogonal Frequency Division Multiple Access (OFDMA) system degrades significantly in doubly dispersive channels. This is due to the fact that exponential sub-carriers do not match the singular functions of this type of channels. To solve this problem, we develop a system whose sub-carriers are chirp functions. This is equivalent to exploiting Fractional Fourier Transform (F...