Robust leakage-based distributed precoder for cooperative multicell systems

The Journal of Engineering

Atílio Gameiro¹  Daniel Castanheira¹  Adão Silva¹ 

[1] DETI, Instituto de Telecomunicações, University of Aveiro, Aveiro, Portugal

关键词: backhaul requirements;    CoMP techniques;    signal-to-noise ratio;    base station;    robust leakage based distributed precoder;    channel estimation error;    BS;    multicell based systems;    coordinated multipoint;    cooperative multicell systems;    spectral efficiency system;    LTE;    backhaul network;    data sharing;    coordinated scheduling;   

DOI  :  10.1049/joe.2014.0141

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

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.

【 授权许可】

CC BY