Notes

Covert Communication (Low Probability of Detection – LPD)

Wireless Communication
I. Makhdoom, M. Abolhasan, and J. Lipman, “A comprehensive survey of covert communication techniques, limitations and future challenges,” Computers & Security, vol. 120, p. 102784, Sep. 2022, doi: 10.1016/j.cose.2022.102784. Best Readings in Covert Communication and Networkinghttps://www.comsoc.org/publications/best-readings/covert-communication-and-networking Covert communication (often called LPD or Low Probability of Detection) is a security paradigm where the goal is not ... Read More

Probability – Introduction

Mathematics, Probability
Book Probability by Jim Pitman, Springer The main concepts of probability theory include: These three concepts form the fundamental framework of probability theory. They describe the structure of any random process, from a simple coin toss to complex risk modeling. Outcome Space (Sample Space) The outcome space (often denoted by the Greek letter Omega, Ω, ... Read More

Linear Algebra – Gaussian Elimination

Linear Algebra, Mathematics
Book: Introduction to Linear Algebra, Johnson et al. Third Edition Gaussian Elimination is a method in linear algebra used to solve systems of linear equations.It systematically transforms a system of equations into a simpler form so the solutions become easy to find. It works by manipulating the augmented matrix of the system using basic row ... Read More

Rank of Matrix

Linear Algebra, Mathematics
The Rank of a Matrix is a fundamental concept in linear algebra that tells you how much “information” or “dimensionality” a matrix preserves. At its core, the rank represents the number of linearly independent rows or columns in a matrix. It is the dimension of the vector space generated by its columns (or rows). https://www.mathsisfun.com/algebra/matrix-rank.html ... Read More

Network Coding

Wireless Communication
https://www.microsoft.com/en-us/research/wp-content/uploads/2007/07/tr-2007-90.pdf In traditional wireless communication, intermediate nodes (routers or relays) act like a postal service: they receive a packet, store it, and then forward it exactly as it was. Network Coding (NC) completely changes this. Instead of just forwarding, nodes are allowed to perform mathematical operations to combine multiple incoming packets into a single outgoing ... Read More

Calculus – Initial Value Problems

Uncategorized
Book Calculus by Thomas/Finney, 9th Edition, Page 282 Understanding Initial Value Problems in Calculus When studying differential equations in calculus, we often encounter something called an Initial Value Problem (IVP). While differential equations describe entire families of functions, an initial value problem helps us find one specific solution that fits a given condition. What Is ... Read More

Channel Estimation and Prediction Datasets

Wireless Communication
The four-dimensional array structure [n_ue, n_rx, n_tx, n_sub] represents the following: WAIR-D Wireless AI Research Datasethttps://arxiv.org/pdf/2212.02159https://www.viwi-dataset.net/ RadoML Datasethttps://github.com/radioML/dataset Raymodtimehttps://www.lasse.ufpa.br/raymobtime

Reconfigurable Intelligent Surface (RIS)

Wireless Communication
https://www.etsi.org/technologies/reconfigurable-intelligent-surfaceshttps://www.rohde-schwarz.com/au/solutions/wireless-communications-testing/wireless-standards/6g/reconfigurable-intelligent-surfaces-ris/reconfigurable-intelligent-surfaces-ris_257043.htmlhttps://www.6gacademy.com/what-is-ris/https://wirelesspi.com/reconfigurable-intelligent-surfaces-ris-a-tutorial/ Reconfigurable Intelligent Surfaces (RIS) are physically placed to act as a bridge between the Base Station (BS) and the User Equipment (UE), particularly in scenarios where the direct path is obstructed. Physical Components of the Surface The physical layout of the surface itself is carefully engineered:

Wireless Systems – Terms

Networking, Wireless Communication
MIMO- Multi input and multi output is wireless technology that multiplies the capcity of a radio link using multiple transmit and receive antennas.https://en.wikipedia.org/wiki/MIMO FDD (Frequency Division Duplex): A transmission mode where uplink and downlink channels operate on different frequency bands. In FDD systems, the base station typically relies on user feedback to obtain downlink CSI ... Read More

Calculus – Integration

Calculus, Mathematics
Book Calculus by Thomas/Finney, 9th Edition, Page 275 Differential Calculus to Integral Calculus. This is where we stop asking “how fast is it changing?” and start asking “how much have we accumulated?” Indefinite Integrals The chapter kicks off with a simple question: If I give you the answer (the derivative), can you tell me the ... Read More
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