Changliang Zheng

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Cognitive radio (CR) is an exciting technology to improve spectrum utilization. However, spectrum availability can change very fast due to primary user's activity, which makes most of existing CR routing protocols fail to work because they are designed for cognitive radio networks (CRNs) with slow variation of spectrum availability. Opportunistic routing is(More)
Heterogeneous deployment of macro cells and small cells is considered as a major network topology in future-generation cellular networks. Such layouts could efficiently and effectively enhance network coverage and capacity. To achieve multigiabit radio access, millimeter wave (mmWave) frequencies will be used in 5G heterogeneous networks (HetNets). A(More)
Efficient data transmission in cognitive radio networks (CRNs) is critical for cognitive radio (CR) users to communicate with each other in an opportunistic manner. Even with successful access to required channels, the transmission could still suffer from failures due to channel fading. In this paper, we propose a random linear coded scheme for efficient(More)
In cognitive radio networks (CRNs), there is no guarantee on the availability of spectrum for the opportunistic communications between cognitive radio (CR) users. Transmission design plays a key role in leveraging the benefits of CRNs. In this paper, we propose an efficient batch transmission scheme for the data transmission in multi-channel CRNs with(More)
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