WiFi Technology

  1. The WiFi Physical Layer (PHY)
    1. Role of the Physical Layer
      1. Data Transmission and Reception
        1. Interface with MAC Layer
          1. Modulation and Demodulation
          2. Spread Spectrum Technologies
            1. Direct-Sequence Spread Spectrum (DSSS)
              1. Operation Principles
                1. Chipping Sequences
                  1. Benefits and Applications
                  2. Frequency-Hopping Spread Spectrum (FHSS)
                    1. Operation Principles
                      1. Hopping Patterns
                        1. Benefits and Applications
                        2. Orthogonal Frequency-Division Multiplexing (OFDM)
                          1. Subcarrier Structure
                            1. Guard Intervals
                              1. Advantages over Single Carrier
                            2. Modulation and Coding Schemes (MCS)
                              1. Modulation Techniques
                                1. Binary Phase Shift Keying (BPSK)
                                  1. Quadrature Phase Shift Keying (QPSK)
                                    1. Quadrature Amplitude Modulation (QAM)
                                    2. QAM Levels
                                      1. 16-QAM
                                        1. 64-QAM
                                          1. 256-QAM
                                            1. 1024-QAM
                                            2. Forward Error Correction (FEC)
                                              1. Convolutional Coding
                                                1. LDPC Coding
                                                  1. Code Rates
                                                  2. Orthogonal Frequency-Division Multiple Access (OFDMA)
                                                    1. Resource Unit Allocation
                                                      1. Multi-User Support
                                                        1. Efficiency Improvements
                                                      2. Channels and Channel Width
                                                        1. Channel Numbering
                                                          1. 2.4 GHz Channel Map
                                                            1. 5 GHz Channel Map
                                                              1. 6 GHz Channel Map
                                                              2. Channel Width Options
                                                                1. 20 MHz Channels
                                                                  1. 40 MHz Channels
                                                                    1. 80 MHz Channels
                                                                      1. 160 MHz Channels
                                                                        1. 320 MHz Channels (Wi-Fi 7)
                                                                        2. Channel Bonding
                                                                          1. Primary and Secondary Channels
                                                                            1. Impact on Throughput
                                                                              1. Trade-offs and Limitations
                                                                              2. Overlapping vs Non-Overlapping Channels
                                                                                1. 2.4 GHz Overlap Issues
                                                                                  1. 5 GHz Non-Overlapping Channels
                                                                                    1. Channel Planning Considerations
                                                                                      1. Interference Avoidance

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                                                                                  4. WiFi Network Architecture and Topologies

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                                                                                  6. The WiFi MAC Layer