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Existing studies on cognitive two-way relay networks assume that the primary users (PUs) transmit data with two power levels. In practice, it is possible that the PUs may adopt multiple power levels to maximize their throughputs or to compensate for wireless link fading. In such a scenario, there exist two key problems: one is the detection accuracy for the secondary users (SUs), and the other is...
In order to improve network performance and cell-edge UE experience, a study item (SI) on "LTE coverage enhancements" has been proposed and approved for LTE-Advanced. In this SI, it was concluded that the coverage of medium data rate PUSCH (Physical uplink shared channel) is poorer than other LTE channels, with significant gap observed. Therefore, coverage improvement for medium data rate...
Heterogeneous Network (HetNet) has been extensively discussed as a solution to increase the capacity of Long Term Evolution-Advanced (LTE-A) systems, which coexist of high power macro base stations (BS) and Low Power Nodes (LPNs) such as pico, femto and relay nodes. This paper focuses on the co-channel deployment of macro and pico cells, in which high spectrum reuse and co-channel interference coexist...
In this paper, we propose two novel HARQ schemes based on dual-stream joint beamforming for long term evolution (LTE) advanced system. As one of the most competitive techniques, dual-stream beamforming can achieve multiplexing gain together with beamforming gain. In this paper, algorithm for beamforming vectors is investigated and two novel HARQ schemes are proposed on this basis to further increase...
As good candidates for uplink multiple access scheme in broadband wireless communication systems, orthogonal frequency division multiplexing (OFDM) and single-carrier (SC) with frequency division multiple access (FDMA) have gained enough attention recently. However, the non-linearity of amplifier deteriorates the performances of these two schemes. On the assumption of non-linear amplifier applied,...
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