Robust leakage-based distributed precoder for cooperative multicell systems

Daniel Castanheira; Adão Silva; Atílio Gameiro

Robust leakage-based distributed precoder for cooperative multicell systems

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Author(s): Daniel Castanheira¹ ; Adão Silva¹ ; Atílio Gameiro¹
- Affiliations: 1: DETI , Instituto de Telecomunicações , University of Aveiro , Aveiro , Portugal
Source: Volume 2014, Issue 7, July 2014, p. 368 – 372
DOI: 10.1049/joe.2014.0141 , Online ISSN 2051-3305

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)

Received 02/06/2014, Accepted 16/06/2014, Published 17/06/2014

Coordinated multipoint (CoMP) from long term evolution (LTE)-advanced is a promising technique to enhance the system spectral efficiency. Among the CoMP techniques, joint transmission has high communication requirements, because of the data sharing phase through the backhaul network, and coordinated scheduling and beamforming reduces the backhaul requirements, since no data sharing is necessary. Most of the available CoMP techniques consider perfect channel knowledge at the transmitters. Nevertheless for practical systems this is unrealistic. Therefore in this study the authors address this limitation by proposing a robust precoder for a multicell-based systems, where each base station (BS) has only access to an imperfect local channel estimate. They consider both the case with and without data sharing. The proposed precoder is designed in a distributed manner at each BS by maximising the signal-to-leakage-and-noise ratio of all jointly processed users. By considering the channel estimation error in the design of the precoder, they are able to reduce considerably the impact of these errors in the system's performance. The results show that the proposed scheme has improved performance especially for the high signal-to-noise ratio regime, where the impact of the channel estimation error may be more pronounced.

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