Toggle Main Menu Toggle Search

Open Access padlockePrints

Adaptive TDD Synchronisation for WIMAX Access Networks

Lookup NU author(s): Dr Konstantinos Ntagkounakis, Professor Bayan Sharif


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


In adaptive time division duplex (ATDD) wireless systems, severe co-channel interference conditions can occur if the movable downlink/uplink (UL) TDD boundary is not synchronised among all frames in base stations. To reduce interference outage and to improve a system's spectral efficiency, a new single frequency cell (SFC) network architecture is proposed, which allows for distributed boundary synchronisation (DBS) via inter-sector signalling. SFC-DBS dynamically synchronises TDD boundaries among neighbouring sectors for each frame, thus avoiding sector-to-sector interference, while preserving the ATDD radio resource assignment efficiency. Analysis shows that SFC-DBS achieves an additional 6-11dB in the average UL signal-to-interference ratio, compared with existing channel assignment schemes, which corresponds to 25-50 capacity gain subject to traffic asymmetry in different sectors. More importantly, the proposed SFC scheme does not incur any further cost in the frequency planning, whereas the DBS scheme requires only minor system modifications. Compared with interference cancellation via antenna arrays and beamforming, SFC-DBS achieves similar performance, albeit without the cost for complex radio transceivers and multiple antenna elements.

Publication metadata

Author(s): Ntagkounakis K, Dallas P, Sharif B, Valkanas A

Publication type: Article

Publication status: Published

Journal: IET Communications

Year: 2007

Volume: 1

Issue: 6

Pages: 1218-1223

ISSN (print): 1751-8628

ISSN (electronic): 1751-8636

Publisher: The Institution of Engineering and Technology


DOI: 10.1049/iet-com:20060005


Altmetrics provided by Altmetric