The 802.11n MIMO-OFDM Standard for Wireless LAN and Beyond

Abstract

An overview is given of the new IEEE 802.11n standard. This is the first wireless LAN standard based on MIMO-OFDM, a technique pioneered by Airgo Networks to give a significant performance increase in both range and rate relative to conventional wireless LAN. Performance results show that net user throughputs over 100 Mbps are achievable, which is about four times larger than the maximum achievable throughput using IEEE 802.11a/g. For the same throughput, MIMO-OFDM achieves a range that is about 3 times larger than non-MIMO systems. This significant improvement in range-rate performance makes MIMO-OFDM the ideal solution not only for wireless LAN, but also for home entertainment networks and 4G networks.

Spectrum sharing between a surveillance radar and secondary Wi-Fi networks

“…By using simplified mean and variance in (30), d min is found as the solution of following equation:…”

“…For any choice of β, protection distances d min and d max can be determined from the constraint in (30), which results in following:…”

“…Therefore, for pulse repetition interval of 1ms, short packets can fall in between inter-pulse intervals with significant probability, while longer packets almost surely overlap with radar pulses. Second, WiFi packets are composed of multiple OFDM symbols each of duration 4µs [30]. A radar pulse of 1-µs width will collide with one symbol (or few symbols when packet is very long) out of many in the packet.…”

Minimizing memory effects in OFDM transmitters using adaptive baseband equalization

“…Advantages of OFOM signals such as 10FT allow to make this equalization at baseband by simply multiplying the 10FT inputs by 1/H(f, Pin) [2,7,8].…”

Evaluating the antenna performance of 802.11n wireless routers in an indoor environment

“…The IEEE 802.11n WLAN standard was ratified in September 2009 and employs multiple antennas at both ends of the link to provide data rates up to 600Mbps [1] [2]. These rates make indoor wireless networks attractive for high-throughput demanding applications such as video-streaming [3].…”