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://sdrforengineers.github.io/) [`reading`](https://courses.washington.edu/ee506/projects/asee2011.pdf) [`reading`](https://github.com/sdrforengineers/LectureMaterials) [`reading`](https://github.com/sdrforengineers/LabGuides) [`video`](https://www.youtube.com/watch?v=9CMX3b-4RUw&ab_channel=WPIECE) - **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).
+- [`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://sdrforengineers.github.io/) [`reading`](https://ieeexplore.ieee.org/document/6815911) [`reading`](https://courses.washington.edu/ee506/projects/asee2011.pdf) [`reading`](https://github.com/sdrforengineers/LectureMaterials) [`reading`](https://github.com/sdrforengineers/LabGuides) [`video`](https://www.youtube.com/watch?v=9CMX3b-4RUw&ab_channel=WPIECE) - **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).
 - [`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.**