Asymmetric Cooperation Among Relays with Linear Precoding


Autoria(s): Devroye, Natasha; Mehta, Neelesh B; Molisch, Andreas F
Data(s)

26/12/2007

Resumo

Fixed and mobile relays are used, among other applications, in the downlink of cellular communications systems. Cooperation between relays can greatly increase their benefits in terms of extended coverage, increased reliability, and improved spectral efficiency. In this paper, we introduce the fundamental notion of asymmetric cooperation. For this, we consider a two-phase transmission protocol where, in the first phase, the base station (BS) sends several available messages to the relays over wireless links. But, depending on the channel state and the duration of the BS transmission, not all relays decode all messages. In a second phase, the relays, which may now have asymmetric message knowledge, use cooperative linear precoding for the transmission to the mobile stations. We show that for many channel configurations, asymmetric cooperation, although (slighlty) sub-optimum for the second phase, is optimum from a total-throughput point of view, as it requires less time and energy in the first phase. We give analytical formulations for the optimum operating parameters and the achievable throughput, and show that under typical circumstances, 20-30% throughput enhancement can be achieved over conventional systems.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/41375/1/Asymmet.pdf

Devroye, Natasha and Mehta, Neelesh B and Molisch, Andreas F (2007) Asymmetric Cooperation Among Relays with Linear Precoding. In: GLOBECOM '07. IEEE Global Telecommunications Conference, 2007., 26-30 Nov. 2007, Washington, DC.

Publicador

IEEE

Relação

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4411745&tag=1

http://eprints.iisc.ernet.in/41375/

Palavras-Chave #Electrical Communication Engineering
Tipo

Conference Paper

PeerReviewed