Recently, the difficulty of placing multiple antennas onto a mobile terminal to exploit more
diversity has been solved by using the cooperative communication technique, in which several
relay nodes with a single antenna partner with each other to serve as virtual multiple antennas
for providing the spatial diversity. Many existing researches in cooperative communication
focuses on designing relay strategies to achieve better communication performance. However,
most of their designs require the channel state information (CSI) being perfectly known. Unfortunately,
CSI is generally unknown in practice. Therefore, before getting benefits brought by
the relay-assisted network, it is necessary to obtain accurate channel state information (CSI)
at the destination or relays. In this thesis, we also consider the training design for channel
estimation in the AF relay network.
The involvement of multiple relay nodes to exploit space diversity in cooperative communications
requires sophisticated and complicated protocols, which poses a difficulty in avoiding
all possible misbehaving relay nodes. Therefore, the channel estimation scheme in cooperative
communication network needs to be robust against the possible relay misbehaviors. However,
most prior works focused on developing channel estimation schemes by assuming perfect relayassisted
communication protocol. By contrast, this work focuses on designing robust channel
estimation schemes to combat the possible presence of the relay misbehaviors. Besides considering
the robust design against relay misbehaviors, this work also considers more general channel
model when designing the training sequence and channel estimation scheme. Specifically, in
contrast to assume independent channels across relays, this thesis considers the correlated channels
in both phases and the correlated noises in the first phase. Overall, the main problem of
this work is to design robust channel estimation and training sequences against relay misbehaviors
when the communication channels within the cooperative network are not restricted to
be independent.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0721110-144450 |
| Date | 21 July 2010 |
| Creators | Huang, Chiun-wei |
| Contributors | Chih-Peng Li, Tsang-Yi Wang, Yu-Chao Tang, Jwo-Yuh Wu, Wan-Jen Huang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0721110-144450 |
| Rights | withheld, Copyright information available at source archive |
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