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The emerging IEEE 802.11ac standard introduces spatial division multiplexing access, in its downlink version, to the wireless local access world. Through this multi-user multiple input multiple output (MU-MIMO) technique the access point (AP) can simultaneously transmit multiple independent groups of streams to different stations. The consequent precoding requires precise channel knowledge and thus...
Most of studies dealing with single user multiple input multiple output (SU-MIMO) and multiple user MIMO (MU-MIMO) rely on physical (PHY) layer only or medium access control (MAC) layer only simulations. In the first case, the apparent considerable performance gains enabled by space division multiple access (SDMA) in downlink transmissions are often obtained without taking into account sounding and...
With the increase in the channel bandwidth to satisfy data rate requirements, the saturation of unlicensed bands quickly becomes a source of difficulty. The collisions that result from the ineluctable frequency reuse will then seriously hinder MAC layer performance. In this paper, we propose a new cross-layer aggregation scheme that increases throughput as a result of compromise between robustness...
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