期刊名称：International Journal of Distributed Sensor Networks
印刷版ISSN：1550-1329
电子版ISSN：1550-1477
出版年度：2015
卷号：2015
DOI：10.1155/2015/389287
出版社：Hindawi Publishing Corporation
摘要：We investigate the joint effects of feedback delay and channel estimation errors (CEE) over Nakagami-
fading channels for two-hop amplify-and-forward (AF) relaying systems with transmit beamforming
(TB) and relay selection (RS). We derive new closed-form expressions for the system outage performance
including the exact analysis and informative high SNR asymptotic approximations, which indicate that
TB feedback delay reduces the achievable diversity order to one, regardless of Nakagami- fading
parameters. Whereas RS delay reduces the diversity order to a case without relay selection and CEE
merely result in coding gain loss, numerical results verify the theoretical analysis and illustrate that the
outage performance is more sensitive to the TB feedback delay.
