Update README.md

README.md

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 ## Communication Systems
 
 - [`course`](https://www.mathworks.com/campaigns/offers/download-rtl-sdr-ebook.html) [`reading`](https://www.mathworks.com/discovery/sdr.html) [`code`](https://github.com/tapyu/stewart-rtl-sdr-using-matlab) **Software-Defined Radio Using MATLAB, Simulink, and the RTL-SDR** - A hands-on course on SDR using the Realtek RTL2832U chip. It is based on the book "Software Defined Radio Using MATLAB & Simulink and the RTL-SDR", by Bob Stewart.
-- [`course`](https://www.youtube.com/playlist?list=PLBfTSoOqoRnOTBTLahXBlxaDUNWdZ3FdS) [`book`](https://www.analog.com/media/en/training-seminars/design-handbooks/Software-Defined-Radio-for-Engineers-2018/SDR4Engineers.pdf) [`reading`](https://wpi.cleancatalog.net/electrical-and-computer-engineering/ece-4305) [`reading`](https://sdrforengineers.github.io/) [`reading`](https://ieeexplore.ieee.org/document/6815911) [`reading`](https://courses.washington.edu/ee506/projects/asee2011.pdf) [`reading`](https://newsdr.org/workshops/sdr-classroom-panel/) [`reading`](https://github.com/sdrforengineers/LectureMaterials) [`reading`](https://github.com/sdrforengineers/LabGuides) [`video`](https://www.youtube.com/watch?v=9CMX3b-4RUw&ab_channel=WPIECE) [`code`](https://github.com/sdrforengineers/code) - **ECE4305 Software Defined Radio Systems and Analysis** - Hands-on course on SDR communication system from the Department of Electrical and Computer Engineering (ECE), at Worcester Polytechnic Institute (WPI), taught by Prof. Dr. Alexander Wyglinski. The course is based on the book "Software-Defined Radio for Engineers", developed by Analog Devices.
+- [`course`](https://www.youtube.com/playlist?list=PLBfTSoOqoRnOTBTLahXBlxaDUNWdZ3FdS) [`book`](https://www.analog.com/media/en/training-seminars/design-handbooks/Software-Defined-Radio-for-Engineers-2018/SDR4Engineers.pdf) [`reading`](https://wpi.cleancatalog.net/electrical-and-computer-engineering/ece-4305) [`reading`](https://sdrforengineers.github.io/) [`reading`](https://ieeexplore.ieee.org/document/6815911) [`reading`](https://courses.washington.edu/ee506/projects/asee2011.pdf) [`reading`](https://newsdr.org/workshops/sdr-classroom-panel/) [`reading`](https://github.com/sdrforengineers/LectureMaterials) [`reading`](https://github.com/sdrforengineers/LabGuides) [`video`](https://www.youtube.com/watch?v=9CMX3b-4RUw&ab_channel=WPIECE) [`code`](https://github.com/sdrforengineers/code) - **ECE4305 Software Defined Radio Systems and Analysis** - Hands-on course on SDR communication system from the Department of Electrical and Computer Engineering (ECE), at Worcester Polytechnic Institute (WPI), taught by Prof. Dr. Alexander Wyglinski. The course is based on the book "Software-Defined Radio for Engineers", developed by Analog Devices, by Travis F. Collins et. al., and the ADALM-PLUTO SDR device.
 - [`reading`](https://www.ieee.li/pdf/essay/quadrature_signals.pdf) **Book Quadrature Signals: Complex, But Not Complicated.**
 - [`reading`](https://www.researchgate.net/publication/3321471_How_I_learned_to_love_the_trellis) **How I learned to love the trellis.**
 - [`reading`](http://whiteboard.ping.se/SDR/IQ) **I/Q Data for Dummies.**