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In this paper, we investigate the outage performance of dual-hop relay networks with co-channel interference which is a major problem in the cellular radio system. A more realistic channel fading model for micro-cellular radio network is adopted as follows, and the desired signal is assumed to have Rician fading due to the presence of line-of-sight (LOS) propagation and the interfering signals from...
Since the infrastructures of the Cognitive radio network are more flexible than the conventional network, a novel network structure is required to adapt with such changes. Thus, we develop the joint design between the transport layer and MAC&PHY layer in overlay Cognitive Radio networks.The objective is to achieve the maximum throughput rationally, concerned with the constraint of interference...
Dynamic spectrum access has become a focal issue recently. Lots of works have been done concerning secondary users (SU) synchronously accessing primary users' (PU) network. However, on one hand, SU have to periodically synchronize with PU's time tables, which will bring lots of unnecessary overhead. On the other hand, it is possible that SU have no idea about PU's communication scheme at all or even...
This paper studies the problem of adaptive resource allocation in OFDMA system. An ant colony algorithm based adaptive resource allocation is proposed in this paper. The problem is modeled as finding a minimum cost path in a graph. The ants' solution construction is guided by pheromone trail and heuristic information. Due to the unique heuristic searching mechanism of the ant colony algorithm, the...
OFDM has become one of the most important Beyond-3G transmission technologies. Mobile WiMAX is a typical representative of OFDM systems. The cross-layer optimization problem of inter-cell coordinated resource allocation for OFDM systems is addressed in this paper. We first analyze the problem by utility-based method, and formulate this optimization problem. Then the globally optimal and a sub-optimal...
Cooperative relay transmission is an effective way to combat multi-path fading. With proper coding scheme, the diversity and coding gains can be obtained. A two-hop decode- and-forward relay protocol using distributed linear dispersion code (LDC) is introduced and analyzed in terms of capacity gains over the system with the traditional uniform power allocation. To optimize the capacity of the system...
In distributed detection systems with wireless sensor networks, the communication between sensors and a fusion center is not perfect due to interference and limited transmitter power at the sensors to combat noise at the fusion center's receiver. The problem of optimizing detection performance with such imperfect communication brings a new challenge to distributed detection. In this paper, sensors...
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