2 research outputs found
Location-Based Optimum Relay Selection in Random Spatial Networks
This paper investigates the location-based relay selection problem, where the
source node chooses its relay from a set of spatially deployed
decode-and-forward relays. The advantages of location-based relay selection are
the elimination of excessive relay switching rate and the feedback reduction
avoiding the requirement of having full channel state information at the source
node. For a homogeneous Poisson point process of candidate relays, we first
derive the distribution for the distance of the relay (relative to the source
and destination nodes) selected by the optimum location-based relay selection
policy. This result is independent of the functional form of the path-loss
function as long as it is a non-increasing function of the transmitter-receiver
separation. By utilizing the derived optimum relay distance distribution, we
then obtain analytical expressions for the average rate and outage probability
by considering the power-law decaying path-loss function for the no-fading and
Rayleigh fading communication scenarios. It is observed that the optimum relay
selection policy outperforms the other common selection strategies notably,
including the ones choosing the relay closest to the source, the relay closest
to the destination and the relay closest to the mid-point between source and
destination
Optimum Location-Based Relay Selection in Wireless Networks
This paper studies the performance and key structural properties of the
optimum location-based relay selection policy for wireless networks consisting
of homogeneous Poisson distributed relays. The distribution of the channel
quality indicator at the optimum relay location is obtained. A threshold-based
distributed selective feedback policy is proposed for the discovery of the
optimum relay location with finite average feedback load. It is established
that the total number of relays feeding back obeys to a Poisson distribution
and an analytical expression for the average feedback load is derived. The
analytical expressions for the average rate and outage probability with and
without selective feedback are also obtained for general path-loss models. It
is shown that the optimum location-based relay selection policy outperforms
other common relay selection strategies notably. It is also shown that
utilizing location information from a small number of relays is enough to
achieve almost the same performance with the infinite feedback load case. As
generalizations, full-duplex relays, isotropic Poisson point processes, and
heterogeneous source-to-relay and relay-to-destination links are also studied