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Message Subject Can anyone help me decipher what this "sign" says? I found this "Tomb" in the cemetary... It may have an important message for me!
Poster Handle dei sapientiam in mysterio
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Picture #4

equation 2:

modern 'Heaviside' form of one of Maxwell's electromagnetic wave equations in a vacuum


Picture #7

Trigonometric polar coordinates unit circle

45 pi/4
135 3pi/4
225 5pi/4
315 7pi/4


'QPSK (Quadrature Phase Shift Keying)'

QPSK (Quadrature Phase Shift Keying) is a phase modulation algorithm.

Phase modulation is a frequency modulation version where the carrier wave’s phase is modulated to encode bits of digital information in each phase change.

The “PSK” in QPSK refers to the use of Phased Shift Keying. Phased Shift Keying is a form of phase modulation that is accomplished by using a discrete number of states. QPSK refers to PSK with 4 states. With half that number of states, there is a BPSK (Binary Phased Shift Keying). With twice the number of states as QPSK, there is a 8PSK.

The “Quad” in QPSK refers to four phases in which a carrier is sent in QPSK: 45, 135, 225, and 315 degrees.

QPSK Encoding
Because QPSK has 4 possible states, QPSK can encode two bits per symbol.
 
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