aubidamax
2012-01-09, 04:37 AM
hi
take a look to this paper..
Abstract
This paper investigates the performance of open-loop multi-antenna point-to-point links in ad
hoc networks with slotted ALOHA medium access control (MAC). We consider spatial multiplexing
transmission with linear maximum ratio combining and zero forcing receivers, as well as orthogonal
space time block coded transmission. New closed-form expressions are derived for the outage probability,
throughput and transmission capacity. Our results demonstrate that both the best performing scheme and
the optimum number of transmit antennas depend on different network parameters, such as the node intensity
and the signal-to-interference-and-noise ratio operating value. We then compare the performance
to a network consisting of single-antenna devices and an idealized fully centrally coordinated MAC.
These results show that multi-antenna schemes with a simple decentralized slotted ALOHA MAC can
outperform even idealized single-antenna networks in various practical scenarios.
http://arxiv.org/PS_cache/arxiv/pdf/1009/1009.3090v2.pdf
thanks....
take a look to this paper..
Abstract
This paper investigates the performance of open-loop multi-antenna point-to-point links in ad
hoc networks with slotted ALOHA medium access control (MAC). We consider spatial multiplexing
transmission with linear maximum ratio combining and zero forcing receivers, as well as orthogonal
space time block coded transmission. New closed-form expressions are derived for the outage probability,
throughput and transmission capacity. Our results demonstrate that both the best performing scheme and
the optimum number of transmit antennas depend on different network parameters, such as the node intensity
and the signal-to-interference-and-noise ratio operating value. We then compare the performance
to a network consisting of single-antenna devices and an idealized fully centrally coordinated MAC.
These results show that multi-antenna schemes with a simple decentralized slotted ALOHA MAC can
outperform even idealized single-antenna networks in various practical scenarios.
http://arxiv.org/PS_cache/arxiv/pdf/1009/1009.3090v2.pdf
thanks....