nmm_enter wrote: > respected > in wlan 802.11a they have mentioned that the data rates varies from > 6,9,12,24,36,48,54 Mbps . So upon what basis thus these data rates > varies and why do they transfer data at these various rates but not > only in a single rate?
The data rate depends on the modulation and coding used. The modulation at lower rates is more robust than the one for higher rates. So depending on the channel quality, BER, eariler lost packets etc., a station may choose to use a more robust modulation/coding (lower data rate). If the link is very good (low packet loss), a station may choose the highest data rate. Having these options lets the transmitter choose the best value for a particular packet. Regards, - Harshal ------------------------ Yahoo! Groups Sponsor --------------------~--> AIDS in India: A "lurking bomb." Click and help stop AIDS now. http://us.click.yahoo.com/VpTY2A/lzNLAA/yQLSAA/5AhqlB/TM --------------------------------------------------------------------~-> http://www.wireless--lan.com/ http://www.wlanforum.com/ http://groups.yahoo.com/group/wirelesslan/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/wirelesslan/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
