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Hi, If you need to vary the fractional delay real-time, farrow resampler is a good choice. If you can afford to recompute the coefficients for each different fractional...

Re: Help with precoding (SDR implementation)

Reply posted 4 years ago (06/07/2020)
Hi Sumit,The rotation of the constellation looks like a classic phase shift. Since your frequency source is between TX and RX is the same (and hence in sync), it...

Re: ADC and Complex Mixer Nyquist question

Reply posted 5 years ago (11/09/2019)
Everyone,Thanks for your replies.My fundamental confusion was how to reconcile with the "additional" bandwidth that comes the I/Q conversion - the mixer is bit of...

ADC and Complex Mixer Nyquist question

New thread started 5 years ago
Hello,So I am struggling with a fundamental Nyquist bandwidth question. My SOC consists of a high-speed ADC followed by a complex mixer (with optional decimation).Say...

Re: FFT Channelizer and PFB

Reply posted 5 years ago (10/08/2019)
I would try the following:1. Run only the analysis-synthesis filters (remove FFT-IFFT). If you get perfect replica, you know the filters are not the reason.2. Remember,...

Re: FFT Channelizer and PFB

Reply posted 5 years ago (10/08/2019)
The analysis and synthesis filter response will govern the output.
Are you doing your unpacking of the 4-sample frame correctly, so that the most recent sample is multiplied by h[0] and so on. It is easy to get the order reversed,...

Re: Real to Complex conversion

Reply posted 5 years ago (12/14/2018)
Conceptually doesn't seem right (not saying it isn't). I know 1Gsps real data can be represented as 500Msps complex data - but that makes intuitive sense since its...

Real to Complex conversion

New thread started 5 years ago
Hi,A very basic question related to real to complex conversion. Let's say I have a ADC sampling at 1Gsps - real samples only. In the digital domain (FPGA), I want...

Re: Correlation of complex sinusoid

Reply posted 6 years ago (06/11/2018)
Thanks acheshir that helps. I realized that thinking in exponential notation also makes this obvious - I was trying to visualize the overlaying of sinusoids which...

Re: Correlation of complex sinusoid

Reply posted 6 years ago (06/11/2018)
Hi Jw,I was thinking along those lines too, but that doesn't line up with the constant correlation I get in software (and as said by dudelsound). I suppose for complex...

Re: Correlation of complex sinusoid

Reply posted 6 years ago (06/11/2018)
Yes - it shows the absolute value. Thanks. 

Correlation of complex sinusoid

New thread started 6 years ago
Hi,Feel a bit sheepish about not being able to figure this out on my own.I am playing with correlating known sequences/preambles in a wireless signal. If my template...

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