The importance of cooperative relaying communication in substituting for, or complementing,
multiantenna systems is described, and a brief literature review is presented.
Amplify-and-forward (AF) and decode-and-forward (DF) relaying are investigated and
compared for a dual-hop relay channel. The optimal strategy, source and relay optimal
power allocation, and maximum cooperative gain are determined for the relay channel. It
is shown that while DF relaying is preferable to AF relaying for strong source-relay links,
AF relaying leads to more gain for strong source-destination or relay-destination links.
Superimposed and selection AF relaying are investigated for multirelay, dual-hop relaying.
Selection AF relaying is shown to be globally strictly outage suboptimal. A necessary
condition for the selection AF outage optimality, and an upper bound on the probability of
this optimality are obtained. A near-optimal power allocation scheme is derived for superimposed
AF relaying.
The maximum instantaneous rates, outage probabilities, and average capacities of multirelay,
dual-hop relaying schemes are obtained for superimposed, selection, and orthogonal
DF relaying, each with parallel channel cooperation (PCC) or repetition-based cooperation
(RC). It is observed that the PCC over RC gain can be as much as 4 dB for the outage
probabilities and 8.5 dB for the average capacities. Increasing the number of relays deteriorates
the capacity performance of orthogonal relaying, but improves the performances of
the other schemes.
The application of rateless codes to DF relaying networks is studied by investigating
three single-relay protocols, one of which is new, and three novel, low complexity multirelay
protocols for dual-hop networks. The maximum rate and minimum energy per bit and
per symbol are derived for the single-relay protocols under a peak power and an average
power constraint. The long-term average rate and energy per bit, and relay-to-source usage
ratio (RSUR), a new performance measure, are evaluated for the single-relay and multirelay
protocols. The new single-relay protocol is the most energy efficient single-relay scheme
in most cases. All the multirelay protocols exhibit near-optimal rate performances, but are
vastly different in the RSUR.
Several future research directions for fixed-rate and rateless coded cooperative systems,
and frameworks for comparing these systems, are suggested. / Communications
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/1674 |
| Date | 06 1900 |
| Creators | Nikjah, Reza |
| Contributors | Beaulieu, Norman C. (Electrical and Computer Engineering), Molisch, Andreas F. (Electrical Engineering, University of Southern California), Schmuland, Byron (Mathematical and Statistical Sciences), Tellambura, Chintha (Electrical and Computer Engineering), Jing, Yindi (Electrical and Computer Engineering) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
| Format | 1601921 bytes, application/pdf |
| Relation | R. Nikjah and N. C. Beaulieu, Strict suboptimality of selection amplify-and-forward relaying under global channel information, IEEE Trans. Commun., vol. 57, no. 10, pp. 29182922, Oct. 2009., R. Nikjah and N. C. Beaulieu, Achievable rates and fairness in rateless coded relaying schemes, IEEE Trans. Wireless Commun., vol. 7, no. 11, pp. 44394444, Nov. 2008., R. Nikjah and N. C. Beaulieu, On the average capacity of rate adaptive single-relay selection decode-and-forward dual-hop relaying in Rayleigh fading channels, to appear in Proc. IEEE Wireless Commun. and Networking Conf. (WCNC), Cancn, Quintana Roo, Mexico, Mar. 2831, 2011., R. Nikjah and N. C. Beaulieu, Exact closed-form expressions for the outage probability and ergodic capacity of decode-and-forward opportunistic relaying, in Proc. IEEE Global Telecom. Conf. (GLOBECOM), Honolulu, HI, Nov. 30Dec. 4, 2009., R. Nikjah and N. C. Beaulieu, Exact capacity analysis of rate adaptive power nonadaptive multibranch multihop decode-and-forward relaying networks, in Proc. IEEE Global Telecom. Conf. (GLOBECOM), Honolulu, HI, Nov. 30Dec. 4, 2009., R. Nikjah and N. C. Beaulieu, Novel rateless coded selection cooperation in dual-hop relaying systems, in Proc. IEEE Global Telecom. Conf. (GLOBECOM), New Orleans, LA, Nov. 30Dec. 4, 2008., R. Nikjah and N. C. Beaulieu, On optimal power allocation for source-orthogonal relay-nonorthogonal amplify-and-forward relaying, in Proc. IEEE Global Telecom. Conf. (GLOBECOM), New Orleans, LA, Nov. 30Dec. 4, 2008., R. Nikjah and N. C. Beaulieu, Achievable rates and fairness in rateless coded decode-and-forward half-duplex and full-duplex opportunistic relaying, in Proc. IEEE Intl Conf. Commun. (ICC), Beijing, China, May 1923, 2008, pp. 37013707., R. Nikjah, N. C. Beaulieu, and M. Ardakani, On relaying in cooperative static channels, in Proc. IEEE Global Telecom. Conf. (GLOBECOM), San Francisco, CA, Nov. 27Dec. 1, 2006, pp. 16. |
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