good clocks (not using GPS) and multi-channel hw [was: sidebands of great justice]
jamesdbell8 at yahoo.com
Fri Nov 8 01:15:45 PST 2013
From: coderman <coderman at gmail.com>
To: David I. Emery <die at dieconsulting.com>; cpunks <cypherpunks at cpunks.org>
Subject: good clocks (not using GPS) and multi-channel hw [was: sidebands of great justice]
>the hardware available for SDR MIMO development leaves much to be desired.
> ... the blocks and implementations for OFDM coding in software are OK :)
>USRP N2X0 can do it, other setups require external reference clock
>with high fidelity. any recommendations for non-GPS clocks performing
>at 50-100ppb or better?
Other than a good ovenized crystal oscillator (OCXO), there is something called a "DCXO" (Digitally-Compensated Crystal Oscillator) that is probably as good as 50 ppb over a moderate temperature range. See, for example, : http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1546247&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4%2F33000%2F01546247.pdf%3Farnumber%3D1546247
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