Abstract
The solutions to an optimal power allocation problem in dual-hop amplify-and-forward (non-regenerative) OFDM relay systems over given channel gains are provided with a joint transmit power constraint. We analytically derive the allocated power to each hop/subcarrier that satisfies the Karush-Kuhn-Tucker (KKT) conditions by solving simultaneous equations. The solutions imply that at most 3(N) - 1 possible power allocation candidates could exist on both source and relay nodes satisfying KKT conditions when N is the number of subcarriers. Based on the solution, a sub-optimal power allocation method that selects only significant allocated power in strong subcarriers is proposed and achieves higher capacity (achievable rate) than conventional sub-optimal methods. As for the feasibility, the number of candidates to be evaluated is N in the proposed method.
| Original language | English |
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| Title of host publication | IEEE Global Telecommunications Conference (Globecom) |
| Editors | Kaminsky Bourgeois, Francis B Grosz |
| Place of Publication | New York NY USA |
| Publisher | IEEE, Institute of Electrical and Electronics Engineers |
| Pages | 4112 - 4117 |
| Number of pages | 6 |
| ISBN (Print) | 9781424423248 |
| DOIs | |
| Publication status | Published - 2008 |
| Externally published | Yes |
| Event | IEEE Global Telecommunications Conference 2008 - New Orleans, United States of America Duration: 30 Nov 2008 → 4 Dec 2008 https://ieeexplore.ieee.org/xpl/conhome/4697774/proceeding (Proceedings) |
Conference
| Conference | IEEE Global Telecommunications Conference 2008 |
|---|---|
| Abbreviated title | IEEE GLOBECOM 2008 |
| Country/Territory | United States of America |
| City | New Orleans |
| Period | 30/11/08 → 4/12/08 |
| Internet address |