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Transmission power control has been used in wireless networks to improve the channel reuse and/or reduce energy consumption. It has been mainly applied to Single-Input Single-Output (SISO) systems, where each node is equipped with a single antenna. This paper proposes a power-controlled channel access protocol for MIMO-capable wireless LANs with two antennas per node. The protocol, called E-BASIC, extends the classic CSMA/CA access scheme by allowing for dynamic adjustment of the transmission mode and the transmission power on a per-packet basis so as to minimize the total energy consumption. By transmission mode the authors mean one of the four possible transmit/receive antenna configurations: 1 ? 1 (SISO), 2 ? 1 (MISO), 1 ? 2 (SIMO) and 2 ? 2 (MIMO).
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