After the IECE 802.1 1 standardization group established the first ABSTRACT wireless LAN standard two years ago, 5everaI efforts were start^ ed to increilsc data rates and also to use other bands. This article dcicribes the new wire^ less LAN standards develolped by IEEE 802.1 1, ETSI BRAN, and MMAC. l~hc new stdndards are targeting data rates up lo 1 1 Mh/s in the 2.4 GHz band and up to 54 Mbis in the 5 GH2 band. L i k e t h e 1EEE 802.1 1 s l a i i d a r d , tlic El,ropcan TcIeeolnnliIIIieeti~,Ils St:ind;irils Inslitutc (ETSI) IIIPU11-I A N lvnc I siandard 131 soccilics hiith iiicc tlic hcgiiiiiing o l (lie I9Ulls, wirclcss lnciil xrcn & networks (W I A N s) lor ilic 900 Mllz, 2, 4, iiiiil 5 (itlz iiiduslriiil, scicntific, ;ind iiiccliciil (ISM) haiiils liiivc hccn available Ixiscil on a raugc oC proprietary produeis. I n. l u w 10'17, the Institute ol Elcciric:il ;ind I?lccironics Eiigiiiccrs ;ipprovctl iin inlcrnalioo;il intcropcr~i1,ility si;indard (IliliF, 802. I I) [I], 71ic sl;i~ulard specifics hoth mcdium ~C C C S S contnrl iiid thrcc dillcrcni plrysicxl kiycrs (PlHY). Tlicrc arc two I;idi~~-lxisccl FHYs using thc 2.4 GHI hand. T l~c iliirtl I'IIY nscs iiifnircd lighl. i\ll I'llYs support ii daia ralc of 1 Mh/s i i n d opiionally 2 Mbls. The 2.4 CiHz lrcqtmicy Lxind is iiviiiliililc fur liccnsc cxcnipi ~i s c in H u r q x , tlic llnilcd Stalcs, aiid J:ipiii. 'I'iiblc I list& ilic availa1,lc frcqiicncy hiinds i i l d lhc rcstriciirriis to dcviccs wliicli iisc this h;ind lin c(iiniiiiiiiiciitiiiiis. Uscs dcm;ind lor liiglicr hit rates uid intcriiaiioiid availahilitp of the 2.4 GHz band has spiirrcd thc dcvelopniciit of a higher-spccd cxtcnsiiio tu thc 802. I I siandiird. In .

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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.