Section II - The Protocol Stack
From the Top Down: Channel Multiplex to Interleaver - Layer 2 and Part of Layer 1


Logical Channels
Logical Channels and the Frequency Domain
Logical Channels in the Time Domain
Logical Channel Types and Rates

Layer 2 PDU Structure
Folding in Data
L2 PDU Types

Layer 1-Processes Common to AM and FM
Scrambling
The Spectral Challenge of OFDM
How Scrambling Works
Convolutional Coding
        Vectors and Matrices
        FM IBOC Rate 2/5 Encoder Example
        Puncturing
        How Convolutional Encoding Helps
        A Diagram Is Worth a Thousand Words
        Puncturing
Interleaving

Layer 1 Continues


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Chapter 5: TABLES
5.1 Protocols Addressed in Chapter 5
5.2 Logical Channels, Service Modes, and OFDM Spectra
5.3 Hybrid IBOC PDU Capacities per Logical Channel
5.4 Layer 2 PDU Formats
5.5 Modulo-2 addition of two bits
5.6 Scrambling of First Six Bits (d1d6) in an L2 PDU
5.7 Input/Output table of the convolution of a data field with a kernel
5.8 Representations of Polynomial Generator Values
5.9 FM IBOC Rate 2/5 Encoder Characteristics
5.10 Sequential Outputs for a K=4, rate 1/3 Polynomial Generator

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Chapter 5: FIGURES
5.1 RF Channel as a Comb
5.2 RF Comb with Tailored Signal Levels
5.3 RF Comb with Analog Signal Interference
5.4 FM Logical Groupings at RF
5.5 Spectral Interlace of IBOC Signals
5.6 AM Logical Groupings at RF
5.7 Layer 2 Inputs and Outputs
5.8 Layer 1 Structure (Generic)
5.9 Harmonic Relationship of OFDM Subarriers
5.10 Peaks generated by nine harmonically related cosine subcarriers (common positive peak)
5.11 Peaks generated by nine harmonically related sine subcarriers (common zero crossing)
5.12 Peaks generated by nine harmonically related subcarriers (four, randomly selected, set 180 degrees out of phase)
5.13 Scrambler Design
5.14 Convolution of a Data Field with a Kernel
5.15 Simple rate 1/3 Encoder, k=1, n=3, m=3, K=4
5.16 FM IBOC Rate 1/3 Mother Code Generator with Rate 2/5 Puncture
5.17 Trellis Diagram of a Rate 1/3, K=4 Polynomial Generator
5.18 Trellis Diagram with Punctured Rate 2/5 Encoding
5.19 AM IBOC Interleavers and Logical Channels
5.20 FM IBOC Interleavers and Logical Channels
5.21 Structure of AM Interleaver Matrix
5.22 Structure of FM Interleaver Matrix

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