Introduction to MIMO and Simple Ways To Use It in GNU Radio
summary
Many GNU Radio users never use extra SMA ports; the slides show practical flowgraphs that change K‑factor, Doppler and tap delays with the built‑in fading model block, demonstrate equal‑gain, selection and maximal‑ratio combining with live constellation and audio, and implement Alamouti space‑time block code implemented in GNU Radio using a Python receiver estimator. Claims include USRPs being MIMO‑capable from USRPs have been MIMO‑capable since USRP1 (2004), observed ~3 dB antenna gain for coherent combining, and a lab example using 64 X310s for 128‑way massive MIMO.
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chapters (14)
- 0:00Introduction
- 2:03What is MIMO
- 3:05How to characterize MIMO
- 5:40Constant vs time varying
- 7:14How to model MIMO
- 8:50Flow graph demo
- 14:24MIMO
- 18:24Communication System
- 20:31Why Use MIMO
- 22:50Diversity Order
- 40:12Space Time Coding
- 43:34Almood Encoder
- 50:08Precoding
- 54:17Massive MIMO
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