IEEE Wireless Communications Letters
IEEE Wireless Communications Letters
5 years ago

Group Zero-Forcing for Dense Small Cell Network With Static Pilot Reuse

Qiang Sun, , Jue Wang, Chen Xu
In this letter, we consider the uplink in a dense small cell network (DSCN) with static pilot reuse, where the user terminals (UTs) in far-distant small cells using the same pilot are assigned to one group, whereas the UTs in neighboring small cells employing orthogonal pilots are allocated to different groups. With large pilot reuse factor, the DSCN has less intra-group interference resulting from pilot contamination in the same group. However, it is difficult to mitigate the inter-group interference caused by co-channel interference in the different groups, which will severely degrade the system performance. To this end, we propose a group zero-forcing (GZF) receiver which actively nullifies the strongest inter-group interferers among all neighboring user groups. For the proposed scheme, we derive exact expression of the uplink per-user achievable rate with GZF. Simulation results verify our theoretical analysis and demonstrate that proposed GZF scheme is very effective in suppressing inter-group interferences.

Publisher URL: http://ieeexplore.ieee.org/document/8004489

DOI: 8004489

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.