This paper investigates the performance of open-loop multi-antennapoint-to-point links in ad hoc networks with slotted ALOHA medium accesscontrol (MAC). We consider spatial multiplexing transmission with linearmaximum ratio combining and zero forcing receivers, as well as orthogonal spacetime block coded transmission. New closed-form expressions are derived for theoutage probability, throughput and transmission capacity. Our resultsdemonstrate that both the best performing scheme and the optimum number oftransmit antennas depend on different network parameters, such as the nodeintensity and the signal-to-interference-and-noise ratio operating value. Wethen compare the performance to a network consisting of single-antenna devicesand an idealized fully centrally coordinated MAC. These results show thatmulti-antenna schemes with a simple decentralized slotted ALOHA MAC canoutperform even idealized single-antenna networks in various practicalscenarios.
展开▼
