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Re: [Discuss-gnuradio] Re: [Openbts-discuss] how openbts set channel ban
Re: [Discuss-gnuradio] Re: [Openbts-discuss] how openbts set channel bandwidth?
Wed, 29 Dec 2010 10:14:01 +0800
Hi Marcus, Thanks for reply. If set the decimation rate exactly the receive bandwidth then gnuradio will automaticly
filter the signal at the receive bandwidth?
On Wed, Dec 29, 2010 at 9:22 AM, Marcus D. Leech <address@hidden>
The OpenBTS software likely sets the incoming decimation rate to match as closely as possible the desired receive bandwidth,
On 12/28/2010 08:05 PM, James Jordan wrote:
Hi Alexander, where the filter perform? In gnuradio?
Since there is a filter, openbts must set it, how openbts set the filter?
then it likely applies an FIR bandpass filter on the software side.
This is, after all, Software Defined Radio, so it should be no surprise to anyone that applications (OpenBTS, or whatever) use
filters implemented in software to condition the signals before further processing. None of that requires the analog filtering to
work in anything other than an anti-alias mode. Filtering and bandwidth reduction is performed first in the FPGA, in the digital
domain, and then on the host, with software, again in the digital domain. Either Gnu Radio, or OpenBTS, or whatever.
Shirleys Bay Radio Astronomy Consortium
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Re: [Discuss-gnuradio] Re: [Openbts-discuss] how openbts set channel bandwidth?, Alexander Chemeris, 2010/12/29