Even with one antenna, 802.11n can achieve higher data rates than the 54Mbit/s max for 802.11g.
802.11n HT20 modes with one antenna allow for up to max 150Mbit/s theoretical data rate. That is why TP-Link advertises these products as capable of 150Mbit/s. Dual antennas are required for the HT40 modes for advertised 300Mbit/s data rates. Also, it's important to point out these advertised rates of 150 or 300MBit/s will never occur in real life (noise, less than perfect signal quality, protocol overhead, etc). On Fri, Nov 20, 2015 at 9:38 AM, Asriadi N <[email protected]> wrote: > according ar9331 datasheet, if we can't use HT40 it means we can't achieve > 150 Mbps data rate and only use data rate > from legacy (b/g). it is right ? > > thanks for you link but I don't know if on this atheros chip is wired for > only one antenna but this link is interesting > (http://www.spinics.net/lists/linux-wireless/msg93735.html). > If we look pcb from mr3020 we can see that there is (maybe) 3 ground antenna > connected to J1, J4 and J2. > > can we use it ? > > > > > 802.11n operation with a single antenna is still possible, i.e. higher data > > rates. Just the spatial and frequency multiplexing aren't available (hence > > HT20 only). > > > Here is more info about the PCB inside those TP-Link travel routers, for > > illustration. You can see photos of the MR3020 PCB with pads for a second > > antenna, but no parts populated. > > http://blog.eikeland.se/2012/09/15/better-wr703n-antenna-mod/ > > <http://blog.eikeland.se/2012/09/15/better-wr703n-antenna-mod/>> > > https://apollo.open-resource.org/lab:argus#modifications > > <https://apollo.open-resource.org/lab:argus#modifications> > > > > On Fri, Nov 20, 2015 at 4:01 AM, Asriadi N <riyadi08 at gmail.com > > <https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users>> wrote: > > >* if this device can only HT20 modes, it means this device can't operate at > >802.11n mode with higher data rate? > *>>* I found that carambola using same SoC but it looks can use HT40. > http://r-ol.blogspot.co.id/2012/12/piratebox.html > <http://r-ol.blogspot.co.id/2012/12/piratebox.html> > *>>* CMIIW* > > > _______________________________________________ > openwrt-users mailing list > [email protected] > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users > > -- Ben West http://gowasabi.net [email protected] 314-246-9434
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