Understanding Physical Media and Modulation in Telecommunications
Previous Concepts: Physical Concepts
Dun Signal Spectrum and Bandwidth
We have seen that signals have an associated RMS frequency, called the fundamental parameter. We have also seen that any continuous and differentiable signal can be decomposed into a sum (finite or infinite) of sinusoidal signals. Each of these sine components will therefore also be associated with a maximum amplitude. The spectrum of a signal is nothing other than the two-dimensional graphical representation of amplitude vs. frequency.
Read MoreAsymptotic Notations, Recurrence Relations, and Dynamic Programming
Asymptotic Notations and Correctness of Algorithms
1. Is the following a property that holds for all non-decreasing positive functions f and g? (True=Yes/ False=No) If f(n) = O(n2) for c=1 and n0=0 and g(n) = Theta(n2) for n0=0 and c1 =1 and c2=1 then f(n) = O(g(n)).
2. Rank the following functions by increasing order of growth: log( n! ), 10000n^2, log(n^3), 2^n, n^2log(n) log(n3), log( n! ), 10000n2, n2log(n), 2n
3. Let W(n) and A(n) denote respectively, the worst case and average
Read MorePython 3 Cheat Sheet
Python 3 Cheat sheet – CWK
Comments
A comment is a piece of text within a program that is not executed. It can be used to provide additional information to aid in understanding the code.
The # character is used to start a comment and it continues until the end of the line.
# Comment on a single lineuser “JDo”# Comment after code
Arithmetic Operations
Python supports different types of arithmetic operations that can be performed on literal numbers, variables, or some combination. The primary arithmetic
Read MoreOperating Systems & Memory Management: A Comprehensive Guide
Exam Cheat Sheet
Memory
Stack & Heap
C programs use the stack for local variables, function parameters, and return addresses.
C programs use the heap for explicitly requested dynamically allocated data (with malloc()).
In general, data is put on the stack unless we use malloc(), then it’s on the heap.
Malloc & Free
Used in C as a type of manual memory management.
Always free malloc()! Else, lose points.
Modern languages like Java, Erlang, etc. use Automatic Memory Management. The system allocates
Read MoreOperating Systems: A Comprehensive Guide
The Operating System is the basic computer software. This software manages all hardware resources of a computer system and provides the basis for the creation and implementation of application software. The system consists of a set of programs, services, and functions that manage and coordinate the operation of the hardware. Thanks to the operating system, the hardware is recognized and the computer system starts to work. Through programs and applications of the operating system, the user can perform
Read MoreAdvantages and Technical Aspects of Digital Television
Advantage Digital Television
1) Increased Noise Immunity
In the case of an analog signal, noise adds to the signal, degrading it as an indivisible whole. In a digital signal, while the noise does not exceed the level causing misinterpretation of the data, it can be extracted without affecting the signal.
2) Increased Capacity for Manipulation
The increasing number of available algorithms can generate effects, expand creative possibilities, and improve the quality of signal processing.
3) Bandwidth Control
Once
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