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Spatial data stream multiplexing scheme for high-throughput WLANs
A novel scheme using spatial data stream multiplexing (SDSM) in the upcoming multiple-input multipleoutput (MIMO)-based IEEE 802.11n physical layer is proposed. It is shown that with SDSM, the same data rate can be achieved by using less number of transmit and receive antennas and therefore this scheme can reduce the number of antennas which results in reducing mutual coupling effects, hardware costs and implementation complexities. The maximum data rates that can be achieved using a 2 * 2 MIMO system is 270 Mbps and for a 4 * 4 MIMO system is 540 Mbps. The same data rates can be achieved using the SDSM technique which reduces the 2 * 2 MIMO system to 1 * 1 SISO system and the 4 * 4 MIMO system to a 2 * 2 MIMO system
On the Performance of Packet Aggregation in IEEE 802.11ac MU-MIMO WLANs
Multi-user spatial multiplexing combined with packet aggregation can
significantly increase the performance of Wireless Local Area Networks (WLANs).
In this letter, we present and evaluate a simple technique to perform packet
aggregation in IEEE 802.11ac MU-MIMO (Multi-user Multiple Input Multiple
Output) WLANs. Results show that in non-saturation conditions both the number
of active stations (STAs) and the queue size have a significant impact on the
system performance. If the number of stations is excessively high, the
heterogeneity of destinations in the packets contained in the queue makes it
difficult to take full advantage of packet aggregation. This effect can be
alleviated by increasing the queue size, which increases the chances to
schedule a large number of packets at each transmission, hence improving the
system throughput at the cost of a higher delay
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