Multiuser Orthogonal frequency division multiplexing (MU-OFDM) is one of the promising techniques for future cellular and wireless networks for achieving high downlink capacities. The objective of the next generation cellular and wireless networks, which are based on (MU-OFDM) is to increase the network efficiency by maximizing the total throughput of the system and minimizing the overall trans...

The WiMAX (IEEE 802.16) technology offers a mechanism to create a multi-hop mesh network and provides a low cost alternative to the cabled access networks. This paper proposes a fuzzy rule based channel allocation technique for efficient spectrum management in multi-channel IEEE 802.16 network (WiMAX). The Subscriber Stations are categorized on the basis of their average traffic pattern. The fr...

Power Line Communications (PLCs) are characterized by a high selectivity of both noise profiles and channel frequency responses which gives importance to the resource allocation problem. Bit-loading has become the acknowledged tool for maximizing system performance over frequency selective channels thanks to its sub-channel-tailored power allocation and has been, therefore, commonly applied in ...

In this paper, we consider the mobility effect with a jointly optimal design of cross-layer congestion control, routing and scheduling for ad-hoc networks. We first formulate the rate constraint and scheduling constraint. In this way, we use multi-commodity flow variables. Then formulate resource allocation in networks with fixed wireless channel and single-rate devices. Because of entrance of ...

Dynamically assigning sub-carriers in the downlink of an OFDMA based cellular system has been shown to exhibit a high potential to combat co-channel interference in according systems. So far, related investigations have assumed up-to-date channel state information as input for the sub-carrier assignment mechanisms, omitting the fact that in most cases there is a significant delay between the ti...

In this chapter, a cooperative broadband relay-based resource allocation technique is proposed for adaptive bit and power loading multiple-input-multiple-output/orthogonal frequency division multiplexing (MIMO-OFDM) system. In this technique, sub-channels allocation, M-QAM modulation order, and power distribution among different sub-channels in the relay-based MIMO-OFDM system are jointly optim...

We focus on a decentralized estimation problem via a clustered wireless sensor network measuring a random Gaussian source where the clusterheads amplify and forward their received signals (from the intra-cluster sensors) over orthogonal independent stationary Nakagami fading channels to a remote fusion center that reconstructs an estimate of the original source. The objective of this paper is t...

This paper concerns sub-channel allocation in multi-user wireless networks with a view to increasing the network throughput. It is assumed there are some sub-channels to be equally divided among active links, such that the total sum rate increases, where it is assumed each link is subject to a maximum transmit power constraint. This problem is found to be a non-convex optimization problem and i...

In this paper we investigate the sub-channel assignment and power control to maximize the total sum rate in the uplink of two-cell network. It is assumed that there are some sub-channels in each cell which should be allocated among some users. Also, each user is subjected to a power constraint. The underlying problem is a non-convex mixed integer non-linear optimization problem which does not h...

In this paper a novel cross layer resource allocation for downlink transmission with heterogeneous traffic in wireless networks is developed. The problem of efficient resource allocation for multiuser orthogonal frequency division multiplexing over Rayleigh fading channels is addressed. Subcarrier and power allocation are carried out sequentially to reduce the complexity. Assuming that the base...