We present the ε-outage capacity of incremental relaying at low signal-to-noise ratios (SNR) in a wireless cooperative network with slow Rayleigh fading channels. The relay performs decode-and-forward and repetition coding is employed in the network, which is optimal in the low SNR regime. We derive an expression on the optimal relay location that maximizes the ε-outage capacity. It is shown that this location is independent of the outage probability and SNR but only depends on the channel conditions represented by a path-loss factor. We compare our results to the ε-outage capacity of the cut-set bound and demonstrate that the ratio between the ε-outage capacity of incremental relaying and the cut-set bound lies within 1/ √ 2 and 1. Furthermore, we derive lower bounds on the ε-outage capacity for the case of K relays. © 2009 IEEE.
Outage capacity of incremental relaying at low signal-to-noise ratios / Renk, T.; Jakel, H.; Jondral, F. K.; Gunduz, D.; Goldsmith, A.. - (2009), pp. 1-5. (Intervento presentato al convegno 2009 IEEE 70th Vehicular Technology Conference Fall, VTC 2009 Fall tenutosi a Anchorage, AK, usa nel 2009) [10.1109/VETECF.2009.5378918].
Outage capacity of incremental relaying at low signal-to-noise ratios
D. Gunduz;
2009
Abstract
We present the ε-outage capacity of incremental relaying at low signal-to-noise ratios (SNR) in a wireless cooperative network with slow Rayleigh fading channels. The relay performs decode-and-forward and repetition coding is employed in the network, which is optimal in the low SNR regime. We derive an expression on the optimal relay location that maximizes the ε-outage capacity. It is shown that this location is independent of the outage probability and SNR but only depends on the channel conditions represented by a path-loss factor. We compare our results to the ε-outage capacity of the cut-set bound and demonstrate that the ratio between the ε-outage capacity of incremental relaying and the cut-set bound lies within 1/ √ 2 and 1. Furthermore, we derive lower bounds on the ε-outage capacity for the case of K relays. © 2009 IEEE.
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