I'm newbie to the dsp topic and my understanding of math symbols is limited. So at the moment I'm little bit lost to find the right resources.
I receive an IQ stream from a SDR. Sample rate: 250k/s The signal I'm interested in is at -10kHz. I need the amplitude of only the -10kHz frequency.
I've found out how to shift the IQ data frequency up/down. But I thought -10kHz is a nice place to be away from DC, and for buffer sizes and sample rate.
What is the most simple solution? Are there other possibilities next to one of the Fourier transformations? Looks like overkill for my simple signal.
But I've found lot of theory stuff handling IQ signals with only one frequency, but nothing enlightening to understand the demodulation of one frequency out of a mix of many from IQ.
I know about the phase change. But something I miss to understand how to collect and calc the right data for my frequency from the IQ.
What would be a nice book (German/English) which explains the stuff without getting lost in math vocab and theory after a few pages? Anything from a software developers perspective?