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From: | Marcus Müller |
Subject: | Re: [Discuss-gnuradio] How to minimize Spillage of energy in neighboring frequencies while transmission |
Date: | Thu, 22 Oct 2015 09:48:48 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
Hi Abhinav, First off: since you want to have a sampling rate of 2kHz, it really doesn't make sense to use the minimal N210 sampling rate 195312.5 Hz. Use something that is a multiple of 2kHz, for example 200kHz or 1MHz. Use a "low pass filter block" with the resulting decimation, the sampling rate set to the rate coming into the filter, and the cutoff frequency let's say to (15.0/16.0 * 2e3) which allows for a transition width of (1.0/8.0*2e3). The placement of the decimation depends a bit on your actual signal of interest; generally, the earlier, the better, since that simply eliminates a majority of noise power. Make sure, however, that the passband width of the filter is "wide" enough so that the FLL can still work. Best regards, Marcus On 21.10.2015 22:45, abhinav narain
wrote:
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