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In this paper, we study a privacy-preserving spectrum sharing system to protect secondary users' location privacy while enhancing spectrum access. The location privacy of secondary users can be compromised by an external adversary via the received signal strength (RSS)-based localization technique. To mitigate such privacy threat, we employ a random power perturbation approach that allows each secondary...
In this paper, we develop a social group utility maximization (SGUM) framework for cooperative networking that takes into account both social relationships and physical coupling among users. Specifically, instead of maximizing its individual utility or the overall network utility, each user aims to maximize its social group utility that hinges heavily on its social ties with other users. We show that...
In this paper, we develop a social group utility maximization game model that takes into account both social relationships and physical coupling among users. Specifically, instead of maximizing one's individual utility, each user aims to maximize its social group utility that hinges heavily on its social ties with other users. A salient feature of this model is that it spans the continuum space between...
It is known that distributed power control in wireless ad-hoc networks is challenging, due to the inherent global coupling between concurrent transmissions interfering with each other. Observing that the globally optimal point lies on the boundary of the feasible region, we transform the utility maximization problem into a more structured problem in the form of maximizing the minimum weighted utility...
We characterize the asymptotic behavior of the throughput capacity and packet delay in cognitive radio (CR) networks. For the model where the network density grows, we derive the scaling laws for secondary users (SUs) who opportunistically access the spectrum when primary users (PUs) are idle. More specifically, we assume that SUs do not know PU (transmitter or receiver) locations a priori, and access...
We study the problem of distributed scheduling in multi-hop MIMO networks. We first develop a ``MIMO-pipe" model that provides the upper layers a set of rates and SINR requirements, which capture the rate-reliability tradeoff in MIMO communications. The main thrust of this study is then dedicated to developing CSMA-based MIMO-pipe scheduling under the SINR model. We choose the SINR model over...
We consider a basic model for two-hop transmissions of two information flows which interfere with each other. In this model, two sources simultaneously transmit to two relays (in the first hop), which then simultaneously transmit to two destinations (in the second hop). While the transmission during the first hop is essentially the transmission over a classical interference channel, the transmission...
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