multiple phy with osmo-trx

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Tom Tsou tom at tsou.cc
Fri Aug 12 21:07:06 UTC 2016


On Fri, Aug 12, 2016 at 1:33 PM, Keith Whyte <keith at rhizomatica.org> wrote:
> On 10/08/2016 19:35, Tom Tsou wrote:
>> There are two ways to implement multi-ARFCN with the B210 - using
>> independent, direct channels for each ARFCN and mutiplexing multiple
>> ARFCN's onto a single RF channel.
> oo.. Possible silly question, but then is this multiplexing single RF
> channel mode possible on the N210?

Not a silly question at all. In fact, it's a very good question.

Yes and no. The N210 device is capable of operating in a similar
configuration, but the implementation is more complicated and, more
importantly, does not exist.

The reason is that the N210 uses a fixed FPGA clocking frequency that
doesn't match up well with the polyphase channelizer used for
multiplexing. The B200/B210 has configurable clocking so that the
desirable sampling rate for GSM channel spacing can be used.

  -TT



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