Questions tagged [sdr]

Software Defined Radio (SDR) is the implementation of radio receiver, detector and transmitter systems in software, as opposed to analog hardware or application-specific ICs. It usually uses a baseband sampled representation of the RF bandpass signals.

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0answers
620 views

IQ imbalance on quadrature signal

Hi I am attempting to develop a reasonable IQ balance mechanism for a quadrature signal coming from a software defined radio.I can balance out the amplitude and phase differences at one frequency ...
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1answer
1k views

Sample rate changing audio pitch

I am using rtl-sdr at an adjustable sample rate to get stuff from a WBFM radio station. I then filter and demodulate it. When I sample at 2.4Msps, the sound is 'choppy'. I tied the sample rate to a ...
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1answer
147 views

Help on implementing an IIR filter

I am new to signal processing and and having difficulty understanding how to implement an IIR filter. The reference is athttp://www.dxatlas.com/rocky/Advanced.asp in the Band scope section. It ...
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1answer
2k views

Splitting a Complex FIR Filter into Real Filters

I'm working on a software defined radio project on a PIC32 MCU. I'm using a CMX 973 quadrature frontend to provide I and Q. I'm independently low passing I and Q with carefully matched analog filters ...
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0answers
342 views

Detect FSK high/low bits in presence of noise with only simple processing

I'm currently in the process of writing DSP code, based on the amazing RTLSDR project, and using this as a vehicle to teach myself the basics of DSP (I have an extensive background in software ...
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2answers
507 views

Software defined radio panadapter

I am trying to make a panadapter for a software defined radio and I am a little bit stuck and hope someone can help me. I have an I Q signal from my radio. (Actually I am using an IQ wav file from ...
3
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1answer
2k views

Processing and plotting quadrature data in the frequency domain

Ok, so I recently started playing around with an SDR in an effort to challenge and educate myself. So, let's say the sampling rate (Fs) is 3MHz and of those we grab 3M samples. Now we are left with 3M ...
3
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1answer
1k views

IQ sampling vs 2X f0 sampling for SDR

Are there any modulation schemes (or other situations) where sampling at or very near twice the carrier frequency would be better than IQ or quadrature sampling using a local oscillator at or near the ...
4
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2answers
1k views

Is it possible to transmit and/or receive multiple types of signals at the same time?

Using an inexpensive SDR (such as the USRP or Per Vices Phi), I want to process two or more communication protocols at the same time (e.g. WiFi and GSM). Is it possible to Tx (or Rx) both at the same ...

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