Ngara broadband access system for rural and regional areas

Iain B. Collings*, Hajime Suzuki, David Robertson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Multi-user multiple-input multiple-output (MU-MIMO) systems have been proposed as a solution for increasing bandwidth efficiency in wireless networks. In this paper we describe a new approach to MU-MIMO for rural and regional areas that we have developed and implemented. The proposed system has achieved six-user MU-MIMO with 12 Mb/s per user data rate in each direction (uplink and downlink, ie. symmetric) over a single 7 MHz channel in an actual rural environment for the first time in the world. The system is in fact capable of providing 50 Mb/s symmetric broadband access for up to 12 simultaneous users over a 28 MHz channel from a single access point. The key aspects of the new system are a synchronisation technology, an access point multi antenna design, an accurate channel estimation and feedback algorithm, and a low computational complexity implementation of crucial signal processing components.

Original languageEnglish
Pages (from-to)14.1-14.5
Number of pages5
JournalTelecommunications Journal of Australia
Issue number1
Publication statusPublished - 2012
Externally publishedYes


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