From first principles to a real wireless PHY.

PART I–II · AVAILABLE TOPICS

The first 19 lessons already exist in Vietnamese; English lesson pages are being translated progressively.

For now, each item below opens the complete Vietnamese lesson. The VI/EN navigation and English site structure are already live, so individual English lessons can be published without changing the URL scheme later.

1. Lesson 01

   What is a signal?

   Sound → microphone → samples → time/frequency domain → FFT → I and Q → resource grid.

   Vietnamese lesson →
2. Lesson 02

   Sampling, aliasing and Nyquist

   How does a continuous waveform become samples, and what happens when sampling is too slow?

   Vietnamese lesson →
3. Lesson 03

   Amplitude, frequency and phase

   The three parameters behind a sinusoid and why phase matters.

   Vietnamese lesson →
4. Lesson 04

   Complex numbers and phasors

   Why complex representation is so natural in signal processing.

   Vietnamese lesson →
5. Lesson 05

   I and Q and complex baseband

   How I and Q represent amplitude and phase.

   Vietnamese lesson →
6. Lesson 06

   Time domain and frequency domain

   Two views of the same signal and what each one reveals.

   Vietnamese lesson →
7. Lesson 07

   Fourier, DFT and FFT

   How a signal is decomposed into frequency components.

   Vietnamese lesson →
8. Lesson 08

   Modulation: BPSK → QPSK → QAM

   How bits become constellation points and complex symbols.

   Vietnamese lesson →
9. Lesson 09

   Baseband → RF → antenna

   How digital I and Q samples become a physical RF waveform.

   Vietnamese lesson →
10. Lesson 10

    Wireless channel

    Attenuation, delay, phase rotation and fading.

    Vietnamese lesson →
11. Lesson 11

    Noise, SNR and EVM

    Ways to quantify degradation at the receiver.

    Vietnamese lesson →
12. Lesson 12

    Multipath and delay spread

    Why copies of the same signal can arrive at different times.

    Vietnamese lesson →
13. Lesson 13

    Correlation

    How a receiver finds a known sequence in noise.

    Vietnamese lesson →
14. Lesson 14

    OFDM: the big picture

    Why splitting bandwidth into many subcarriers is useful.

    Vietnamese lesson →
15. Lesson 15

    IFFT/FFT in OFDM

    How frequency-domain symbols become time-domain samples and back again.

    Vietnamese lesson →
16. Lesson 16

    Cyclic Prefix

    How CP protects OFDM against channel delay spread.

    Vietnamese lesson →
17. Lesson 17

    Resource grid

    Subcarriers, OFDM symbols, resource elements and resource blocks.

    Vietnamese lesson →
18. Lesson 18

    5G NR numerology

    How SCS, symbol duration, slots and frames change with numerology.

    Vietnamese lesson →
19. Lesson 19

    What happens when a UE powers on?

    From unknown timing and cell identity to PSS, SSS, PBCH and the MIB.

    Vietnamese lesson →