We propose channel estimation and direct equalization techniques for transmission over doubly selective channels. The doubly selective channel is approximated using the basis expansion model (BEM). Linear and decision feedback equalizers implemented by time-varying finite impulse response (FIR) filtersmay then be used to equalize the doubly selective channel, where the time-varying FIR filters ...

We present a two-echelon dual-channel inventory model in which stocks are kept in both a manufacturer warehouse (upper echelon) and a retail store (lower echelon), and the product is available in two supply channels: a traditional retail store and an Internet-enabled direct channel. The system receives stochastic demand from two customer segments: those who prefer the traditional retail store a...

channel activities, particularly those of calcium channels, have vital roles in the process of sperm maturation, motility and sperm-egg interaction. a group of the recently discovered ion channels associated with these processes is four novel channel-like proteins known as catsper (cation channel sperm) gene family. catsper1 and catsper2 show sperm specific expression patterns. however, neither...

The performance of a wireless signal propagation can be estimated with the properties or characteristics of the channel. This paper begins with the classification of the important characteristic of a channel i.e, fading. After that fast fading modeling for multipath with no direct path and multipath with direct path is analyzed in the fourth part of this paper. In the last section of this paper...

This paper empirically investigates how the intensity of direct-to-consumer advertising depends on the sales channel, using data from the US mutual fund industry. The empirical analysis exploits the presence of two sales channels within the industry, one where firms sell directly to end consumers and another where firms sell through expert intermediaries. I find that firms in the direct sales c...

This paper assesses the impact of sharing customers’ channel preference information on pricing and performance in a dual channel supply chain, where the supplier opens a direct channel and a traditional retailer owns a retail channel. Both the supplier and the retailer perform their forecasting demands based on the ratio of consumers’ preferences in the direct channel when we consider the chara...

Abstract The influence of the orientation ratchet-type rough surfaces on their fluid dynamic roughness effect is investigated using direct numerical simulations turbulent channel flow at $$Re_{\tau }=395$$ R e τ = 395 </...