Yuanxuan Li

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Accurate and mathematically tractable channel models are valuable tools in the network performance analysis and simulation. Most of Markov chain channel models are designed based on first-order Markov chain, which means that each channel state can only transit to the adjacent states. However, this assumption is no longer valid when the transceivers operate(More)
The wave propagation in tunnels does not only depend on the carrier frequency and properties of the tunnel, but also differs along with the distance between transmitter (Tx) and receiver (Rx). This letter presents a complete structure and model for propagation in tunnels. Compared to existing models, the complete model unifies different academic viewpoints,(More)
Device-to-device (D2D) communications have recently been considered as a promising technology to improve the resource utilization of the cellular network and the user throughput between devices in proximity to each other. In this paper, we present an interference model with the channel shadowing and fading for D2D communications. This model assumes that the(More)
Interference alignment (IA) technique has shown great promise in many theoretical studies. However, the performance improvement brought by IA in the MIMO interference network has not been investigated well when combined with power allocation. This paper proposed a joint IA-based beamforming design and power allocation method with an objective of optimizing(More)
The power allocation is a vital issue for cognitive radio networks. The secondary system should select the proper transmission scheme to meet the demand of data transmission with interference constraint. Many existed papers aim to maximize the channel capacity of the secondary system and whose power allocation schemes do not consider the influence of the(More)
In this paper, a hybrid modulation classification via Kolmogorov-Smirnov test and cumulant test method for the cognitive network has been proposed. The modulation classification is a method to evaluate the unknown modulation format. In cognitive systems, the cognitive users (CR) can classify the modulation formats of the primary users (PR), which helps to(More)
The co-channel interference becomes the main influence factor in the cellular network with the universal frequency reuse. In this paper, we investigate the downlink resource allocation for a cellular network with two-hop cooperative relay, considering the influence of the co-channel interference. We firstly study a randomized transmission scheme, where the(More)
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