The half-duplex multiple relay-assisted channel is investigated,
where the relays work under decode-and-forward (DF) in
time/frequency orthogonal resources. Achievable rates are
optimized with respect to the transmitted powers and with respect
to the fraction oftimelbandwidth allocated to the relay-receive and
the relay-transmit phases. Different transmission strategies
associated to different complexities at the receivers are considered.
For each case we take into account either the synchronous or
asynchronous transmission of the terminals, depending on the
availability of channel state information (CSI) in transmission
from all links. We find that all the cases can be formulated as a
unique convex problem, and we compare the achievable rates thus
obtained. We finally derive under which conditions the use of two
DF relays brings significant gains over the use of one.
CitationVidal, J.; Agustín, A. Resource optimization in the decode-and-forward multiple relay-assisted channel. A: IEEE Signal Processing Advances in Wireless Communications. "SPAWC 2008". Pernambuco: 2008, p. 436-440.
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