Toshiba shows 100 Mbps MIMO Wi-Fi Toshiba used the setting of the Geneva ITU Telecom World 2003 conference to demonstrate what it described as a "low complexity" WLAN capable of achieving data transfer rates of up to 100 Mbps -- nearly double that of the 802.11g and 802.11a standards. Toshiba's solution relies on MIMO (multiple input, multiple output), which improves WLAN performance by using multiple channels simultaneously through multiple antennae. Spatial multiplexing schemes then reconstruct the data, while improved signal processing boosts the network's range. Performance quality increases in proportion to the number of antennae built into the system. MIMO uses OFDM, as does 802.11g. Toshiba says it has extended MIMO in two ways: by improving the bandwidth it offers over single-antenna systems, and by simplifying the underlying hardware. The system uses a technique called pseudo-exhaustive state space searching to reduce the complexity of the work a WLAN adaptor must do to decode incoming radio signals. Toshiba is not the first to use MIMO technology: U.S. chip-maker Airgo is already sampling chipsets which use a dual-antenna MIMO rig to achieve rates of up to 108 Mbps, and Intel said it was committed to include MIMO into its future WLAN products and push for the inclusion of MIMO in 802.11n.
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