Title :
WLC33-2: On Relaying in Cooperative Static Channels
Author :
Nikjah, Reza ; Beaulieu, Norman C. ; Ardakani, Masoud
Author_Institution :
iCORE Wireless Commun. Lab., Univ. of Alberta, Edmonton, AB
fDate :
Nov. 27 2006-Dec. 1 2006
Abstract :
It is shown that regenerative relaying in a dual- hop diversity static or quasi-static relay channel can outperform non-regenerative relaying only if the source-relay link is reliable and power allocation to the source and the relay is optimized. In regenerative relaying, a maximal ratio combining receiver at the destination has an error floor at high signal-to-noise ratios. However, maximal ratio combining is not a maximum-likelihood structure in this application. Maximum-likelihood detection at the destination can remove this error floor, but cannot always make the performance of regenerative relaying surpass that of non- regenerative relaying. A hybrid protocol which avoids some of the limitations of previous relaying schemes is proposed. Conditions under which relaying increases the equivalent source-destination signal-to-noise ratio, and hence, the source-destination channel capacity are derived and the gain of the cooperation is calculated. The analysis provides quantitative measures for choosing the best relay among a set of candidates.
Keywords :
channel capacity; diversity reception; maximum likelihood detection; protocols; receivers; cooperative static channels; dual-hop diversity static channel; hybrid protocol; maximal ratio combining receiver; maximum-likelihood detection; power allocation; regenerative relaying; source-destination channel capacity; source-relay link; Diversity methods; Diversity reception; Fading; Maximum likelihood decoding; Maximum likelihood detection; Protective relaying; Protocols; Relays; Signal to noise ratio; Wireless communication;
Conference_Titel :
Global Telecommunications Conference, 2006. GLOBECOM '06. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0356-1
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2006.806