English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this paper, we have considered the uplink cross-tier interference in multi-macrocell heterogeneous networksystem, where each macrocell consists of a number of small cells. Cross-tier interference between macrocell user equipments (MUEs) and small cells base stations (SBSs) exists in both intra-macrocell and inter-macrocell due to high transmit power of MUEs. The MUE-to-SBS interference from both local and adjacent macrocells is dealt with interference alignment (IA) with the aid of a central processing node, and co-tier interference caused by small cell user equipments (SUEs) and MUEs is dealt with minimum mean square error method. To reduce the channel state information (CSI) bits transmitted through inter-cell backhaul with limited capacity required by IA, the idea of MUE-to-SBS interfering pair selection (IPS) is employed before IA. The effects of different IPS schemes on the performance of the system have been investigated. Results show that the proposed multi-macrocell IA algorithm improves the performance of SUEs while maintaining that of MUEs compared with others&#x2019; previous work in single-macrocell scenario. In addition, numerical results show that it is wise not to align all cross-tier interference. We can achieve better performance while decreasing the load for transmitting precise MUE-to-SBS CSI on inter-cell backhaul by selecting an appropriate number of participants in our proposed IA algorithm.

Cross-Tier Interference Alignment With Interfering Pair Selection in Uplink Heterogeneous Networks With Multiple Macrocells