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Mobile Multimedia Broadcasting - Part 1: Framing Structure, Channel Coding and Modulation for Broadcasting Channel
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Basic data
| Standard ID | GY/T 220.1-2006 (GY/T220.1-2006) |
| Description (Translated English) | Mobile Multimedia Broadcasting - Part 1: Framing Structure, Channel Coding and Modulation for Broadcasting Channel |
| Sector / Industry | Radio, Film & TV Industry Standard (Recommended) |
| Classification of Chinese Standard | M60 |
| Classification of International Standard | 33.160 |
| Word Count Estimation | 166,177 |
| Date of Issue | 2006-10-24 |
| Date of Implementation | 2006-11-01 |
| Quoted Standard | GB/T 7400.2; GB/T 7400.11, |
| Regulation (derived from) | Communication Standards and Quality Information Network |
| Issuing agency(ies) | State Administration of Radio and Television |
| Summary | This standard specifies the 3OMHz ~ 3000MHz frequency range, mobile multimedia broadcasting system broadcast channel transmission signal frame structure, channel coding and modulation. This standard applies to the 3OMHz ~ 3000MHz frequency range, via satellite and/or terrestrial wireless transmitter television, radio, data and other multimedia signals broadcast systems. |
GY/T 220.1-2006: Mobile Multimedia Broadcasting - Part 1: Framing Structure, Channel Coding and Modulation for Broadcasting Channel
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Mobile Multimedia Broadcasting.Part 1. Framing Structure, Channel Coding and Modulation for Broadcasting Channel
People's Republic of China Radio, Film and Television Industry Standard
Mobile multimedia broadcasting. Part 1. Broadcast channels
Frame structure, channel coding and modulation
Mobile Multimedia Broadcasting Part 1. Framing Structure, Channel Coding and
Modulation for Broadcasting Channel
2006-10-24 released
2006-11-01 Implementation
Published by the State Administration of Radio, Film and Television
GY
Contents
Foreword ... III
Introduction ... IV
1 Scope ... 1
2 Normative references ... 1
3 Terms, definitions, abbreviations, symbols and conventions ... 1
3.1 Terms and definitions ... 1
3.2 Acronyms ... 2
3.3 Symbols and operators ... 3
4 System description ... 3
4.1 Summary ... 4
4.2 Physical layer structure ... 4
4.3 Physical layer frame structure ... 5
4.4 Input and output of the physical layer ... 8
5 Subsystem description ... 8
5.1 RS coding and byte interleaving ... 8
5.2 LDPC encoding ... 9
5.3 Bit interleaving ... 10
5.4 Constellation mapping ... 10
5.5 Frequency-domain OFDM symbol formation ... 12
5.6 Scrambling Codes ... 15
5.7 OFDM modulation ... 16
5.8 Framing ... 17
5.9 Modulated RF Signal ... 17
Appendix A (Normative) Transmitter Identification Sequence ... 21
Appendix B (Normative Appendix) RS (240, K) Generation Method ... 28
Appendix C (Normative) LDPC codeword bitmap vectors ... 30
Appendix D (Normative) LDPC code parity check matrix H ... 53
Appendix E (Informative) System payload data rate ... 159
Figure 1 Physical layer logical channel of the broadcast channel of the mobile multimedia broadcast system ... 4
Figure 2 Physical layer functional block diagram ... 5
Figure 3 Frame structure based on time slot division ... 5
Figure 4 Beacon Structure ... 5
Figure 5 Synchronous signal pseudo-random sequence generator ... 7
Figure 6 OFDM symbols ... 7
Figure 7 Overlap between guard intervals ... 7
Figure 8 Guard interval signal selection ... 8
Figure 9 Byte interleaver and RS (240, K) coding ... 9
Figure 10 Bit interleaving ... 10
Figure 11 BPSK constellation mapping ... 11
Figure 12 QPSK constellation mapping ... 11
Figure 13 16QAM constellation mapping ... 12
Figure 14 Signal distribution pattern ... 13
Figure 15 Linear feedback shift register generating scramble code ... 16
Figure 16 Schematic diagram of OFDM symbol subcarrier structure (Bf = 8MHz) ... 17
Figure 17 Schematic diagram of OFDM symbol subcarrier structure (Bf = 2MHz) ... 17
Figure 18 Theoretical power spectrum of a broadcast channel modulation signal (Bf = 8MHz) ... 18
Figure 19 Theoretical power spectrum of a broadcast channel modulation signal (Bf = 2MHz) ... 19
Figure 20 Modulated signal spectrum mask (Bf = 8MHz) ... 19
Figure 21 Modulated signal spectrum mask (Bf = 2MHz) ... 20
Table 1 T0 and T1 values ... 7
Table 2 Byte Interleaver Parameters MI ... 9
Table 3 LDPC encoding configuration ... 9
Table 4 Bit interleaver parameter values ... 10
Table 5 Position of consecutive pilots in OFDM symbols ... 13
Table 6 Continuous pilots used to transmit system information ... 14
Table 7 Transmission instructions ... 14
Table 8 Initial value of scrambled shift register ... 15
Table 9 Relative power value of each point in the spectrum mask when the in-band power is defined as 0dB (Bf = 8MHz) ... 20
Table 10 Relative power value of each point in the spectrum mask when the in-band power is defined as 0dB (Bf = 2MHz) ... 20
Table A1 Transmitter identification sequence ... 21
Table B1 RS (240,240) generator polynomial coefficients ... 28
Table B2 RS (240,224) generator polynomial coefficients ... 28
Table B3 RS (240,192) generator polynomial coefficients ... 28
Table B4 RS (240,176) generator polynomial coefficients ... 29
Table E1 System payload data rates ...
Foreword
This standard is Part 1 of the GY/T 220 mobile multimedia broadcasting standard series.
Appendices A, B, C, and D of this standard are normative appendices.
Appendix E of this standard is an informative appendix.
This standard is under the jurisdiction of the National Radio and Television Standardization Technical Committee.
This standard was drafted. State Administration of Radio, Film and Television, Academy of Broadcasting Science, Beijing Taimei Century Technology Co., Ltd.
The main drafters of this standard. Yang Qinghua, Tao Tao, Ge Qihong, Liang Yibin, Song Weishi, Bai Dong.
Introduction
The issuer of this standard draws attention to the following facts. When users declare compliance with this standard, they may use
Related granted and pending patents.
The issuing body of this standard does not provide any opinions on the scope, validity and verification information of patents.
The patent holder has assured the issuing authority of this standard that it is willing to cooperate with any applicant on reasonable and non-discriminatory terms and conditions.
Negotiate with authorization. The patent holder's statement has been submitted to the issuer of this standard.
The following table lists the patentee's information.
Contact address of patentee
Beijing Taimei Century Technology Co., Ltd. 11F, Unit 2, Building 2, No. 2 Landianchang East Road, Haidian District, Beijing (100097)
Contact. Ye Ruirui
Correspondence address. 11F, Building 2, Unit 2, No. 2, Landianchang East Road, Haidian District, Beijing
Postal Code. 100097
Email. ruirui.ye@timitech.com
Phone. 010-88865631
Please note that in addition to the patents that have been identified in the standard patent license statement, some parts of this part of GY/T 220 may involve their
It's patented. GY/T 220 The issuing agency of this section shall not bear the responsibility of identifying these patents.
Mobile multimedia broadcasting. Part 1. Broadcast channel frame structure, channel coding and modulation
1 Scope
This standard specifies the frame structure of the signal transmitted by the broadcast channel of the mobile multimedia broadcast system in the frequency range of 30MHz to 3000MHz,
Channel coding and modulation.
This standard applies to the transmission of television, radio, and data signals through satellite and/or terrestrial wireless in the frequency range of 30MHz to 3000MHz
Broadcasting system for multimedia signals such as information.
2 Normative references
The clauses in the following documents have become the clauses of this standard after being referenced. For dated references, all subsequent
Neither amendments (excluding errata) or revised versions are applicable to this standard, however, parties who have reached an agreement under this standard are encouraged to study
Is the latest version of these files available? For undated references, the latest version applies to this standard.
GB/T 7400.2 Radio and television terminology radio broadcasting
GB/T 7400.11 Digital TV Terminology
3 Terms, definitions, abbreviations, symbols and conventions
3.1 Terms and definitions
The following terms and definitions apply to this standard.
3.1.1
Guard interval
Sends a transition signal between symbols for smoothing between symbols.
3.1.2
Pilot pilot
A part of the subcarriers at a specific position in the OFDM symbol is used to transmit a signal demodulated by an auxiliary terminal.
3.1.3
Transmitter identifier signal
A signal at the beginning of each time slot in the physical layer signal frame, used to distinguish between different transmitters.
3.1.4
Constellation mapping
The process of mapping the symbols to be transmitted to the signal vector on the constellation.
3.1.5
Control logical channel
The physical layer logical channel used to transmit system control information. The channel parameters are fixed.
3.1.6
Scattered pilot
Pilots with different positions in adjacent OFDM symbols.
3.1.7
Continuous pilot
Pilots with the same position in adjacent OFDM symbols.
3.1.8
Forward error correction code
A coding structure that obtains error correction capabilities by adding redundant information.
3.1.9
Scramble code
Binary sequence for data randomization.
3.1.10
Upper-layer data stream
A data stream allocated by an upper-layer protocol and broadcast to a terminal via a logical channel in the physical layer.
3.1.11
Time slot
Signal segments with a fixed time length in the physical layer signal frame can be received separately by the terminal.
3.1.12
Data sub-carrier
A subcarrier in an OFDM symbol used to carry an upper layer data stream.
3.1.13
Physical logical channel
The physical layer carries the transmission channels of the upper-layer service data streams. Each physical layer logical channel is independently coded and modulated, which can occupy one or more
Time slot.
3.1.14
Beacon
A signal at the beginning of each time slot, including the transmitter identification signal and the synchronization signal.
3.1.15
Virtual sub-carrier
The OFDM subcarrier that does not carry any signal, the carrier transmit power is 0.
3.1.16
Cyclic prefix
A piece of data located before the OFDM data body, whose content is a copy of the tail data of the OFDM data body.
3.1.17
Service logical channel
The physical layer logical channel used for transmitting services. The channel parameters are configurable.
3.1.18
Valid sub-carrier
The subcarriers that carry the actual signals in the OFDM symbols include data subcarriers, discrete pilots, and continuous pilots.
3.2 Acronyms
The following abbreviations apply to this standard.
BPSK (Binary Phase Shift Keying)
CP (Cyclic Prefix)
CLCH (Control Logical Channel) Control logical channel
FEC (Forward Error Correction)
GI (Guard Interval)
IFT (Inverse Fourier Transform)
LDPC (Low Density Parity Check)
LSB (Least Significant Bit)
MSB (Most Significant Bit)
MUX (Multiplex)
Orthogonal Frequency Division Multiplexing (OFDM)
PLCH (Physical Logical Channel) Physical layer logical channel
PN (Pseudo-random Noise Sequence)
QAM (Quadrature Amplitude Modulation)
QPSK (Quadrature Phase Shift Keying)
RS (Reed-Solomon Codes) Reed-Solomon Codes
SLCH (Service Logical Channel) service logic channel
TxID (Transmitter Identifier)
TS (Time Slot)
3.3 Symbols and operators
The following symbols apply to this standard.
fB physical layer bandwidth
H LDPC parity check matrix
bI bit interleaver columns
bM bit interleaver rows
IM byte interleaver rows
bN Number of subcarriers for synchronization signal
Number of subcarriers of the IDN transmitter identification signal
Number of subcarriers of SN OFDM symbol
Number of effective subcarriers for VN OFDM symbols
() cP i complex pseudo-random scrambling code sequence
() S t Physical layer RF signal
() bS t sync signal
() IDS t transmitter identification signal
() nS t OFDM symbol
bT synchronization symbol length
CPT OFDM symbol cyclic prefix length
GIT guard interval length
Symbol length of IDT transmitter identification signal
Symbol length of ST OFDM symbol
Data body length of UT OFDM symbol
GIT guard interval length
() wt window function
() bX i frequency domain pseudo-random sequence
() IDX i Transmitter identification signal frequency domain pseudo-random sequence
() bfΔ Subcarrier interval of synchronization signal
() IDfΔ Subcarrier interval of the transmitter identification signal
() SfΔ Subcarrier interval of OFDM symbol
The following operators apply to this standard.
T matrix transpose operator
⊗ Convolution operator
4 System description
4.1 Summary
This standard defines each functional module of the physical layer of the broadcast channel of the mobile multimedia broadcast system in the frequency range of 30MHz to 3000MHz, and
The frame structure, channel coding, modulation technology, and transmission instruction information of the physical layer transmission signal of the mobile multimedia broadcast channel are presented. This standard sets
The defined broadcast channel physical layer bandwidth (fB) includes 8MHz and 2MHz options. Broadcast channel physical layer in the form of physical layer logical channel
It provides upper-layer services with a configurable transmission channel and one or more independent broadcast channels. Physical layer logical channel support
It supports multiple coding and modulation methods to meet different requirements for signal quality in different services and different transmission environments. Broadcasting information as defined in this standard
The physical layer supports two networking modes. single-frequency network and multi-frequency network. Different transmission modes can be selected according to the characteristics of the application service and the networking environment.
parameter. The physical layer supports a mixed mode of multiple services, matching the service characteristics and transmission modes, and realizing the flexibility and economy of business operations
Sex.
4.2 Physical layer structure
This section outlines the physical layer structure of the broadcast channel of a mobile multimedia broadcast system. Physical Channel Logical Channel
(PLCH) provides a broadcast channel for upper-layer services. The physical layer logical channel is divided into a control logical channel (CLCH) and a service logical channel (SLCH).
The control logical channel is used to carry broadcast system control information, and the service logical channel is used to carry broadcast services. The physical layer has only one fixed control
Control logical channel, occupying the 0th time slot of the system to send Service logical channels are configured by the system.
The number can be 1 to 39, and each service logical channel occupies an integer number of time slots, as shown in Figure 1.
Time slot
Time slot
Time slot
Time slot
Time slot
Time slot
Time slot
k + 1
Time slot
k + 2
Time slot
Time slot
Time slot
Channel coding, modulation, time slot allocation
CLCH SLCH0 SLCH1 SLCH SLCH
PLCH
Figure 1 Physical layer logical channel of the broadcast channel of the mobile multimedia broadcast system
The physical layer encodes and modulates each physical layer logical channel separately, and the control logical channel uses fixed channel encoding and modulation.
Control mode. RS coding uses RS (240,240), LDPC coding uses 1/2 code rate, constellation mapping uses BPSK mapping, and the initial value of the scrambling code is an option
0. The coding and modulation modes of the service logical channel can be flexibly configured according to system requirements. The configuration mode is broadcast to the terminal through system control information.
According to different coding and modulation parameters, the physical layer can provide different transmission payloads. For specific parameters, see Appendix E.
The coding and modulation functional block diagram of the physical layer logical channel is shown in Figure 2. The detailed content of each sub-module is defined in Chapter 5. Input from upper layers
The incoming data stream is multiplexed with discrete pilots and continuous pilots after forward error correction coding, interleaving, and constellation mapping to perform OFDM modulation. Tune
The processed signal is inserted into the frame header to form a physical layer signal frame, and then transmitted after baseband to radio frequency conversion.
RS coding and
Byte interleaving
LDPC
Constellation mapping
Bit cross
Upper data stream 2
Scrambling framing
Baseband to
Radio frequency
Transform
OFDM frequency
Domain symbol
form
OFDM tone
Radio frequency emission
RS coding and
Byte interleaving
LDPC
Constellation mapping
Bit cross
Upper data stream 1
Discrete derivative
Continuous guidance
Transmission
Display information
RS coding and
Byte interleaving
LDPC
Constellation mapping
Bit cross
Upper data stream N
Figure 2 Physical layer functional block diagram
4.3 Physical layer frame structure
4.3.1 Frame Structure
The physical layer signal is 1 frame every 1 second and is divided into 40 time slots. The length of each slot is 25ms, including 1 beacon and 53 OFDM symbols.
The frame structure based on time slot division is shown in Figure 3.
Figure 3 Frame structure based on time slot division
4.3.2 Beacons
The beacon structure is shown in Figure 4, including the transmitter identification signal (TxID) and two identical synchronization signals.
Figure 4 Beacon structure
4.3.2.1 Transmitter identification signal
The transmitter identification signal () IDS t is a pseudo-random signal with limited frequency band and is used to identify different transmitters. () IDS t length is recorded as IDT, value
It is 36.0 sμ. The transmitter identification signal is shown in equation (1).
2 ( ) ( )
1 () (), 0
ID
ID IDCP
jift T
ID ID ID
iID
S t X iet T
Δ −
= ≤ ≤∑ ... (1)
In the formula.
IDN-number of subcarriers of the transmitter identification signal
() IDX i-BPSK modulated signal carrying the transmitter identification sequence
() IDfΔ --Subcarrier interval of the transmitter identification signal, the value is 39.0625kHz
IDCPT --Cyclic prefix length of the transmitter identification signal, value is 10.4 sμ
The number of sub-carriers IDN of the transmitter identification signal is as follows according to different physical layer bandwidth (fB).
256, 8
64, 2
ID
B MHz
B MHz
= ⎧⎪ = ⎨ = ⎪⎩
...(2)
The BPSK modulated signal () IDX i carrying the transmitter identification sequence is generated by mapping the transmitter identification sequence () TxID k.
And formula (4).
8fB MHz =.
1 2 (1), 1 95
() 0, 0 96 159
1 2 (65), 160 255
ID
TxID ii
X iii
TxID ii
− × − ≤ ≤⎧⎪ = = ≤ ≤⎨⎪ − × − ≤ ≤⎩
Or ... (3)
2fB MHz =.
1 2 (1), 1 18
() 0, 0 19 44
1 2 (27), 45 63
ID
TxID ii
X iii
TxID ii
− × − ≤ ≤⎧⎪ = = ≤ ≤⎨⎪ − × − ≤ ≤⎩
Or ... (4)
The transmitter identification sequence () TxID k is 191 bits (8fB MHz =) or 37 bits (2fB MHz =), as defined in Appendix A.
4.3.2.2 Sync Signal
The synchronization signal () bS t is a band-limited pseudo-random signal, the length is recorded as bT, and the value is 204.8 sμ. See Equation (5) for the synchronization signal.
2 ( )
1 () (), 0
jift
bbb
ib
S t X iet T
= ≤ ≤∑ ... (5)
In the formula.
bN-the number of subcarriers of the synchronization signal
() bX i-BPSK modulated signal carrying binary pseudo-random sequence () bPN k
() bfΔ-the subcarrier interval of the synchronization signal, with a value of 4.8828125kHz
The number of subcarriers bN of the synchronization signal is as follows according to different physical layer bandwidths (fB).
2048, 8
512, 2
B MHz
B MHz
= ⎧⎪ = ⎨ = ⎪⎩
... (6)
The BPSK modulated signal () bX i carrying the binary sequence pseudo-random () bPN k is generated from the () bPN k mapping.
(7).
8fB MHz =.
1 2 (1), 1 768
() 0, 0 769 1279
1 2 (512), 1280 2047
PN ii
X iii
PN ii
− × − ≤ ≤⎧⎪ = = ≤ ≤⎨⎪ − × − ≤ ≤⎩
Or ... (7)
2fB MHz =.
1 2 (1), 1 157
() 0, 0 158 354
1 2 (198), 355 511
PN ii
X iii
PN ii
− × − ≤ ≤⎧⎪ = = ≤ ≤⎨⎪ − × − ≤ ≤⎩
Or ... (8)
The binary pseudo-random sequence () bPN k is generated by the linear feedback shift register shown in FIG. 5, and the generator polynomial is. 11 9 1x x. Shift
The initial value of the register is the same for each synchronization signal and is 01110101101 (see Figure 5).
Figure 5 Synchronous signal pseudo-random sequence generator
4.3.3 OFDM Symbol
An OFDM symbol consists of a cyclic prefix (CP) and an OFDM data body (see Figure 6). OFDM data body length (UT) is 409.6 sμ, loop
The prefix length (CPT) is 51.2 sμ, and the OFDM symbol length (ST) is 460.8 sμ. See Section 5.7 for the OFDM symbol generation method.
CP OFDM data body
TUTCP
TS
Figure 6 OFDM symbol
4.3.4 Guard interval
The transmitter identification signal, synchronization signal and adjacent OFDM symbols overlap each other through the guard interval (GI), the length of the guard interval
(GIT) is 2.4 sμ. After adjacent symbols are weighted by the window function () wt, the tail GI of the previous symbol and the head GI of the next symbol
See Figure 7 for the superposition. The window function () wt is defined in equation (9).
Figure 7 Overlap between guard intervals
()
() () 0 10 1 0 1 0 1
0.5 0.5cos (/), 0
( ) 1,
0.5 0.5cos (() /), 2
GI GI
GI GI
GI GI GI
t T t T
wt T t TTT
TT t TTTT t TTT
π π
π π
≤ ≤⎧⎪ = < < ⎨⎪ − ≤ ≤ ⎩
...(9)
In the formula.
0T-length of the data body, the values are shown in Table 1
1T-Cyclic prefix length, see Table 1 for values
Table 1 T0 and T1 values
Signal T0 (sμ)
T1
(sμ)
Transmitter identification signal 25.6 10.4
Sync signal 1) 409.6 0
OFDM symbol 409.6 51.2
1) Note. When the symbols overlap, two synchronization signals in each time slot are treated as one signal, and no guard interval is added between the two synchronization signals
The guard interval signal is selected as shown in Figure 8.
CPGI GI
Data body
TGI T 1 T0 TGI
copy
copy
Figure 8 Guard interval signal selection
4.4 Input and output of the physical layer
The input of the physical layer is the upper layer data stream, and the output is a radio frequency signal.
5 Subsystem description
5.1 RS coding and byte interleaving
RS coding and byte interleaving are performed by inputting and outputting in columns and in row coding. RS code uses RS (240, K) with a code length of 240 bytes
Truncated code. This code is generated by truncating the original RS (255, M) system code, where M = K 15. K is the byte of the information sequence in a codeword
The number of check bytes is (240-K). The RS (240, K) code provides 4 modes, which are K = 240, K = 224, K = 192, and K = 176.
Each symbol of the RS code is taken from the field GF (256), and the field generating polynomial is 8 4 3 2 () 1p xxxxx =. Multiple generations of RS (240, K)
See Appendix B for terms.
The truncated code RS (240, K) is encoded as follows. Add 15 all “0” s before K input information bytes 0 1 1 (,,,) Km mm −L
Byte, constructed as the input sequence of the original RS (255, M) system code
0 1 1 0 1 255 1 (0,0,, 0,,,,,,,,) K Mm mmppp− − −LLL, and then delete the added bytes from the codeword to get a 240-byte truncation Short RS code
Word 0 1 1 0 1 255 1 (,,,,,,,) K Mm mmppp− − −LL.
The byte interleaver is a block interleaver, and its structure is shown in Figure 9. The number of byte interleaver columns is fixed at 240, which is the same as the code length of the RS code, and the interleaving depth
Determined by the number of rows IM. The byte interleaver is divided into an information area (shaded area on the left side of FIG. 9) and a check area (non-shaded area on the right side of FIG. 9) by columns. word
The section interleaver partition is adapted to the RS code. When RS (240, K) is used, columns 0 to (K-1) of the byte interleaver store information bytes. Byte crossing
Each byte in the weaver is represented by its coordinates in the interleaver. For example, the byte located in the sth row and the tth column of the interleaver is denoted as, stB.
The upper layer data stream is input to the byte interleaver in the following way. the binary bit stream is divided into bytes according to the low-order first method, and byte-by-byte and column-by-column.
Padded to the byte interleaver. The column number filled by the byte interleaver is arranged in ascending order from 0 to (K-1). When filling the k-th column, first fill 0, kB bytes,
Fill up to 1, IM kB − bytes in sequence, the k-th column is filled, and the next byte is filled to the 0th byte in the k-1st column, up to the (MI-1) th in the (K-1) th column
Bytes.
In the r-th row of the byte interleaver () 0 1Ir M ≤ ≤ −, the information area forms a message sequence of length K (), 0, 1, 1,,, rrr KB BB −L, as
Input is RS (240, K) code. The output codeword of the RS (240, K) code is (), 0, 1, 1, 0, 1, 239,,,,,,, rrr K rrr KB BB ppp− −LL, where
(), 0, 1, 239,,, rrr Kp pp −L is (240-K) check bytes. Parity byte,, (0 239) r ip i K ≤ ≤ − padding to the byte interleaver, r KB to
, 239rB bytes.
The byte interleaver is output in column order. The 0th column of data is output until the 239th column of data is output. When outputting the k-th column of data
() 0 239k ≤ ≤, output 0, kB, 1, kB, 1, IM kB − bytes in order. All bytes (MI × 240 bytes) mapping in the byte interleaver
Send over an integer number of complete time slots, where the 0,0B byte of the byte interleaver is always sent at the beginning of the time slot.
The byte interleaver includes three modes. See Table 2 for MI value rules in each mode. Wherein, when 2fB MHz =, the interleaving pattern is determined by the star
Block mapping and LDPC code rate decision. interleaving mode 1 is only used for BPSK constellation mapping; interleaving mode 2 is only used for QPSK constellation mapping; interleaving mode 3
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