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In this paper, we develop a distributed power control scheme for relay channels with confidential message in an uplink OFDMA-relay cellular by Amplify-and-Forward mode. We introduce a two-stage game in a progressive optimization. In this scenario, the relay is considered not only as a sender that assists the information transmission, but also as an eavesdropper who can wiretap information. In the...
In this article, we propose a semi-distributed resource allocation framework for the resource optimization in multi-cell uplink cooperative orthogonal frequency division multiplexing systems. Specifically, we model the resource allocation framework as an optimal problem. This optimization problem is divided into two steps. First, using integer programming, we achieve the joint relay selection and...
Subcarrier and power allocation plays an important part in optimizing the performance of OFDMA systems. However, inter-cellular interference is often neglected in resource allocation. In this paper, with the inter-cell interference taken into account, we propose a subcarrier and power allocation framework based on Game Theory in uplink OFDMA multi-cellular systems. In this algorithm, the subcarrier...
In the paper, we consider the interference as a detriment to the performance of the relay enhanced cellular system. Then we build up the interference channel model based on amplify-and-forward protocol and decode-and-forward protocol, respectively. The interference comes not only from the adjacent cells, but also from the inner of the same cell. Moreover, proper power allocation can obtain a good...
Power allocation with relay selection with incomplete channel state information is considered. Particularly, the utility function is based on the rate and adds the different pricing schemes to reflect the cost of each node according to the different status of each node. We decide if and which relay node to take part in cooperative communication based on the SNR of each node. Then the source and the...
A joint subcarrier and power allocation in uplink OFDMA systems with incomplete channel state information is proposed. The subcarrier allocation problem is considered as a multi-player discrete, stochastic and finite strategy game, and equal power is allocated to the subcarriers of each user. Particularly, the utility function is based on the channel capability and adds the pricing scheme to guarantee...
In this paper, a joint power and subcarrier allocation scheme in single-cell uplink OFDMA systems is proposed based on game theory. Our goal is to maximize the power efficiency of each user under peak power constraint. For the purpose, a utility function is designed which can enhance the rate per joule of energy consumed greatly, and the existence and uniqueness of the Nash equilibrium of the function...
In this letter, we focus on a subcarrier and power allocation scheme in uplink OFDMA systems, where each user has not only the different power constraints, but also was limited by the different rates. A subcarrier and power allocation algorithm is proposed. In this algorithm, the subcarrier allocation is based on the normalized channel gain, and the power allocation is based on the pricing function,...
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