On Thu, Nov 07, 2013 at 11:32:13PM -0800, coderman wrote:
On Thu, Nov 7, 2013 at 8:44 PM, David I. Emery <die@dieconsulting.com> wrote:
... sending modulated tones over a speaker to a remote microphone is likely wickedly full of multipath ... Sound does not propagate all that fast compared to useful data rates after all.
So OFDM is good.
you can even run OFDM in 900Mhz with the Ubiquiti SR9 radios, oldies but goodies
combine MIMO with OFDM for even more multipath resistance and throughput. (MIMO audio channels ala dolby applied is amusing ;)
SDR MIMO kit leaves much to be desired, however...
Ettus has some new lower-cost SDR boards that are getting approving glances from several of my radio-savvy friends: https://www.ettus.com/product/category/USRP-Bus-Series And the new kid on the block is Nuand BladeRF, with a half-the-cost design that seems pretty promising: https://nuand.com/ Both of these theoretically support MIMO, with clock distribution available as an added-cost option to sync up multiple boards' Tx/Rx. -andy