In this dissertation we consider several relay selection strategies for multi-hop cooperative networks.
The relay selection strategies we propose do not require a central controller (CC).
Instead, the relay selection is on a hop-by-hop basis.
As such, these strategies can be implemented in a distributed manner.
Therefore, increasing the number of hops in the network would not increase the complexity or time consumed for the relay selection procedure of each hop.
We first investigate the performance of a hop-by-hop relay selection strategy for multi-hop decode-and-forward (DF) cooperative networks.
In each relay cluster, relays that successfully receive and decode the message from the previous hop form a decoding set for relaying,
and the relay which has the highest signal-to-noise ratio (SNR) link to the next hop is then selected for retransmission.
We analyze the performance of this method in terms of end-to-end outage probability,
and we derive approximations for the ergodic capacity and the effective ergodic capacity of this strategy.
Next we propose a novel hop-by-hop relay selection strategy where
the relay in the decoding set with the largest number of ``good'' channels to the next stage is selected for retransmission.
We analyze the performance of this method in terms of end-to-end outage probability in the case of perfect and imperfect channel state information (CSI).
We also investigate relay selection strategies in underlay spectrum sharing cognitive relay networks.
We consider a two-hop DF cognitive relay network with a constraint on the
interference to the primary user.
The outage probability of the secondary user
and the interference probability at the primary user are analyzed
under imperfect CSI scenario.
Finally we introduce a hop-by-hop relay selection strategy for underlay spectrum sharing multi-hop relay networks.
Relay selection in each stage is only based on the CSI in that hop.
It is shown that in terms of outage probability,
the performance of this method is nearly optimal.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-05262016-103215 |
| Date | 09 June 2016 |
| Creators | Sun, Hui |
| Contributors | Naraghi-Pour, Morteza, Liang, Xuebin, Wei, Shuangqing, Wu, Hsiao-Chun, Larson, Keri |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-05262016-103215/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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