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This paper considers the problem of physical layer security of a wireless orthogonal frequency division multiplexing (OFDM) communication system. We first develop a transmit filter-aided secure OFDM system scheme which can disturb eavesdropper's receptions by destroying the orthogonality of OFDM signals at the eavesdropper, while the quality of legitimate transmission is maintained. Then, in an effort...
Optimum solutions of the power allocation and partner choice of cooperative wireless communications have been addressed in a considerable amount of literatures. However, most achieved results are based on the transmission over flat fading channels, while the wireless transmission channels in closed space should be considered to have the frequency-selective nature. These proposed solutions are not...
In next generation cellular system, heterogeneous network will be widely used to improve the spatial spectrum efficiency. In this paper, we propose a new interference cancelation scheme to increase the achievable sum-rate of multi-carrier interference channels in heterogeneous networks. The subcarriers are cooperated where one group subcarriers transmit in full-rate as if there is no interference...
Intra-cell interference management is one of the technical challenges for device-to-device (D2D) communication underlaying cellular networks. In this paper, we propose two superposition coding-based cooperative relaying schemes to exploit the transmission opportunities for the D2D users without deteriorating the performance of the cellular users. In the first scheme, the D2D transmitter (DT) is enabled...
With the increasing number of mobile terminals, the capacity of cellular network can hardly satisfy the user requirement in the future. In next generation cellular systems, heterogeneous network is proposed to improve the spatial spectrum efficiency. In this paper, we study a joint coding scheme to increase the achievable sum-rate of multi-carrier heterogeneous systems, where we introduce transmission...
This paper proposes a new network-wide optimized time division multiple access (TDMA) scheduling scheme for wireless sensor networks (WSNs). It can simultaneously achieve maximum throughput and fair rate allocation given the requirement of network lifetime. To achieve this object, we first formulate the rate allocation problem based on the Lexicographic Max-Min (LMM) criterion, which takes fairness,...
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