In this paper, we present the high-level description of a class of MAC protocols called wireless tree protocols (WTPs). WTPs are developed for provisioning QoS guarantees in wireless cellular networks, wireless LANs, and cluster-based ad hoc wireless networks with bursty traffi c and/or heterogeneous bandwidth requirements at different mobile stations. We propose several wireless tree channel a...

With increasing number of wireless devices like laptops, Wi-Fi Web Cams, network extenders, etc., a new kind of problems appeared, mostly related to poor Wi-Fi throughput or communication problems. In this paper an investigation on wireless networks and it’s saturation in Vilnius City and its surrounding is presented, covering the main problems of wireless saturation and network load during day...

In this paper, we study the traffic optimization problem for a heterogeneous traffic network by considering utility functions of data and voice traffic. We also study the performance of multimodal networks, where other modes of communication like wires, infrared links may operate in addition to wireless nodes to improve the performance of the wireless network. We assume the presence of an addit...

The aim of this paper is to share novel paradigm of channel estimation for orthogonal frequency division multiplexing (OFDM) systems. OFDM is used to improve spectral efficiency and spatial diversity in wireless communications systems. This paper provides a review of channel estimation techniques (blind and pilot-aided) and its performance on data-aided channel. After comparison with known tech...

The high expectations of performance and availability for wireless mobile systems has presented great challenges in the modelling and design of fault tolerant wireless systems. The proper modelling methodology to study the degradation of such systems is so-called performability modelling. In this paper, we give overview of approaches for the construction and the solution of performability model...

The exceptional growth of the telecommunication industry in recent years fueled by the widespread popularity of mobile phones and wireless computer networking. The demand of wireless communication is constantly growing and need the tether less connectivity. The major limitations to this growth is the disadvantages of traditional wireless communication System due to the limitations of available ...

In this paper, adaptive channel management approach fuzzy neural networks in heterogeneous wireless cellular networks (ACM-FNN) is presented to efficient resource allocation, and admission control schemes are needed to guarantee quality-of-service (QoS) for differentiated services. The channel management in a two-tier such as micro cell or macro cell wireless cellular networks. Effective reliab...

The introduction of third generation wireless systems provides the opportunity to develop a wide range of new mobile data services. Many of the proposed services (e.g. Voice over IP, streaming audio/video, and other multimedia) include data that require guarantees on throughput, delay, and probability of data loss. However, wireless links are inherently unreliable since the channel is subject t...

Wireless communication is blooming along with Internet access from mobile devices which is an essential criterion for information access from anywhere, any time and any device. In this survey, review on various technologies like pervasive computing, mobile communication systems, selective dissemination of information, with location and device independent information interchange specification li...

We present a novel approach to wireless fair scheduling in a distributed architecture. Our scheme is based on a simple extension of wireline fair scheduling by compensation for lost capacity after the losses occur. In addition, the scheduler can give limited compensation for unused capacity. This provides an incentive for users of the location-dependent wireless channel to optimize their channe...