Providing reliable broadband wireless communications in high mobility environments, such
as high-speed railway systems, remains one of the main challenges faced by the …

Channel estimation for an orthogonal frequency-division multiplexing (OFDM) broadband
system over a doubly selective channel is very challenging. This is mainly due to the …

In this paper, channel estimation and training sequence design are considered for amplify-
and-forward (AF)-based two-way relay networks (TWRNs) in a time-selective fading …

In this paper we propose a novel method for communication over underwater acoustic
channels that exhibit simultaneously large delay spread and Doppler spread, such as those …

Coherent data communication over doubly-selective channels requires that the channel
response be known at the receiver. Training-based schemes, which involve probing of the …

We propose a novel pilot-aided algorithm for estimation of rapidly varying wireless channels
in OFDM systems. Our approach is specifically designed for channels varying on the scale of …

It is well-known that time-varying channels can provide time diversity and improve error rate
performance compared to time-invariant fading channels. However, exploiting time diversity …

We address the problem of estimating doubly-selective channels using pilot clusters that are
time-division multiplexed with the data. The pilot clusters consist of zero-padded pilot …

We consider comb-type OFDM transmission over doubly-selective channels. Given a fixed
number and total power of the pilot subcarriers, we show that the MMSE-optimum pilot …

In signal processing, the purpose of sampling (or sensing) is to accurately capture the
salient information in a signal of interest using as few samples as possible. A question that …