- 期刊
- OpenAccess
以方向性天線改善異質性無線網路之二階層式干擾
Two-Tier Interference Mitigation with Directional Antennas in Heterogeneous Networks
摘要
小細胞（Small-Cell）能以低功率之異質性網路（Heterogeneous Network, HetNet）架構改善系統容量和覆蓋區域，但是伴隨產生的巨細胞（Macrocell）與小細胞間的二階層式干擾（Two-Tier Interference）卻是異質性網路中的主要挑戰，尤其是在公寓大樓中密集佈建的小細胞網路更是顯著。在本文中，我們以三維方向性天線來減少二階層式干擾，以提高超密集異質小細胞網路的系統容量，採用三維方向天線能以其主波瓣的高功率增益特性提供較強的信號給用戶，而以較低增益的旁波瓣來減輕鄰近小細胞基地台間的干擾，得以管理二階層式干擾之影響，透過模擬結果顯示，6扇區的方向性天線較全向性天線可增加146%的系統平均傳輸率。
並列摘要
Small-cells can improve the system capacity and coverage with low power for heterogeneous networks (HetNets). However, the two-tier interference from macrocell and small-cells is the key challenge when small-cells are densely deployed in an apartment building. In this paper, we propose the three-dimension directional antenna to decrease the two-tier interference and improve the system capacity for the ultra-dense heterogeneous small-cell network. The three-dimension directional antenna can provide the strong signal to users with the high main lobe gain, and mitigate the interference to the neighboring small-cells with low side lobes. Therefore, the average system throughput can be significantly improved under the link reliability requirement. Simulation results show that our proposed 6-sector directional antenna can improve 146% average system throughput compared to the omnidirectional antenna under the link reliability requirement. Meanwhile, the omnidirectional antenna cannot provide the stable service quality for users in the ultra-dense heterogeneous small-cell network.