9 May
2017
9 May
'17
8:41 p.m.
Hi Marcus,
On Tue, May 9, 2017 at 9:53 AM, Marcus Dias <vmarcusv(a)gmail.com> wrote:
Most BTS code I have, generate only one or two 200 kHz
channels, but I need
to test a receiver using several (multiplexed) 200 kHz channels, composing
approximately 5 MHz of total bandwidth. This should be a "valid" multiplex
signal (correct and "decodable" control channel). Can anyone pointout where
should I start to put together the software to generate a binary file with
such signal? I guess I can inspect the code of a BTS that supports two TRX
(two 200 kHz channels) but I would like to double check whether there is a
more direct approach.
It sounds like you need a raw IQ sampled binary file at about 5 Msps.
Is that correct?
There are a variety of methods to achieve this depending on your
requirements. You could generate the multiplexed signal live with up
to 3 adjacent ARFCN channels (800 kHz separation) with a B200 and
osmo-trx with multi-ARFCN enabled.
But, it sounds like you just need a test file, so you could
post-process an existing single ARFCN signal file in Octave or Matlab
to carry multiple versions of the same GSM signal. That may or may not
be sufficient depending on your needs.
-TT