Cross-tier interference mitigation considering pilot overhead for TDD MIMO heterogeneous networks

• Kamiwatari Shunsuke

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• Muta Osamu

  Center for Japan-Egypt Cooperation in Science and Technology, Kyushu University

Abstract

In a two-tier heterogeneous network, cross-tier interference mitigation between macro-cell (MC) and small-cell (SC) is an important issue, where MC and SC share the same time/frequency resources. In this article, we propose a method to mitigate downlink cross-tier interference between MC and SC, where macro-cell base-station (MBS) and small-cell base-stations have multiple antenna arrays and their precoding weights are optimized to mitigate mutual cross-tier interference under a given pilot overhead. Simulation results show that the proposed scheme improves the downlink sum-rate compared with conventional scheme that coordinates cross-tier interference from MBS to small-cell users under the same pilot overhead condition.

Journal

• IEICE Communications Express

  IEICE Communications Express 9 (6), 230-237, 2020

  The Institute of Electronics, Information and Communication Engineers

Keywords

• two-tier heterogeneous network
• massive MIMO
• orthogonal pilot
• pilot overhead

Details

• CRID: 1390848250114979712
• NII Article ID: 130007850850
• DOI: 10.1587/comex.2020xbl0021
• ISSN: 21870136
• Web Site: https://www.jstage.jst.go.jp/article/comex/9/6/9_2020XBL0021/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed