<Tr> <Td> ah </Td> <Td> Dec 2016 </Td> <Td> 0.9 </Td> <Td> 1 - 16 </Td> <Td> Up to 347 </Td> <Td> </Td> <Td> MIMO - OFDM </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> aj </Td> <Td> Est . Jul 2017 </Td> <Td> 45 / 60 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> ax </Td> <Td> Est . Dec 2018 </Td> <Td> 2.4 / 5 </Td> <Td> </Td> <Td> Up to 10.53 Gbit / s </Td> <Td> </Td> <Td> MIMO - OFDM </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> ay </Td> <Td> Est . Nov 2019 </Td> <Td> 60 </Td> <Td> 8000 </Td> <Td> Up to 20,000 (20 Gbit / s) </Td> <Td> </Td> <Td> OFDM, single carrier, </Td> <Td> 10 m (33 ft) </Td> <Td> 100 m (328 ft) </Td> </Tr>

Explain ieee 802.11 standards for wireless lan (wlan) communications