This website gives an overview of all standards that apply LDPC codes. The standards are categorized by the organization that published the standard. Furthermore, draft standards are listed. Just click on the standard you want to know more about.

Furthermore, you might want take a look at the LDPC code database which lists the properties of more than 200 standardized LDPC codes. The database only considers different parity check matrices, e.g., applying puncturing is not considered as obtaining a new parity check matrix. Let us know if anything is missing!

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ETSI

DVB-S2X

DVB-S2X is the next generation satellite transmission standard which is an extended version of its well-established predecessor DVB-S2. The new specification allows for spectral efficiency gains of up to 50% by offering lower roll-off factors, higher modulations and a finer code rate granularity compared to DVB-S2.

Standard

DVB-S2X

  Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications.
Organization ETSI
Publication 2014
Documents BlueBook A83-2 / EN302307-2
Applications Satellite Communication (Broadcasting, DSNG, ...)
IP Cores

Creonic DVB-S2X Demodulator IP Core

Creonic DVB-S2X LDPC/BCH Decoder IP Core

LDPC Codes 55
  Block Length Submatrix Size Code Rates
  16200 360

1/5, 1/3, 2/5, 4/9, 3/5, 2/3, 11/15, 7/9, 37/45, 8/9 (DVB-S2)

11/45, 4/15, 14/45, 7/15, 8/15, 26/45, 32/45 (DVB-S2X)

  64800 360

1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10 (DVB-S2)

2/9, 13/45, 9/20, 90/180, 96/180, 11/20, 100/180, 26/45, 18/30, 28/45, 23/36, 116/180, 20/30, 124/180, 25/36, 128/180, 13/18, 22/30, 135/180, 7/9, 154/180 (DVB-S2X)

DVB-S2

In 2005 DVB-S2 became the first standard to adopt LDPC codes. Today it is quite popular and the de-facto standard for high-speed satellite communication. The standard defines four different system configurations and application areas: broadcast services, interactive services, digital satellite news gathering (DSNG), and professional services.

The properties of the LDPC codes in this standard make the hardware implementation of the LDPC decoder quite challenging. With 64800 bits the DVB-x2 series offers the longest LDPC codeword sizes, consuming quite a bit of memory in a hardware realization. Throughputs are typically less than 100 Mbit/s on the air interface. Together with an outer BCH decoder, the forward error correction of the DVB-S2 standard achieves an outstanding error correction performance.

 

Standard

DVB-S2

  Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications.
Organization ETSI
Publication 2005
Documents ETSI EN 302 307
Applications Satellite Communication (Broadcasting, DSNG, ...)
IP Core Creonic DVB-S2 LDPC/BCH Encoder and Decoder IP Core
LDPC Codes 21
  Block Length Submatrix Size Code Rates
  16200 360 1/5, 1/3, 2/5, 4/9, 3/5, 2/3, 11/15, 7/9, 37/45, 8/9
  64800 360 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10

DVB-T2

DVB-T2 is the successor of DVB-T. It was published in 2009 and integrates a subset of the LDPC codes as defined in DVB-S2. Two LDPC codes (block length 16200, code rate 3/5 and block length 64800, code rate 2/3) were, however, replaced. While DVB-S2 uses LDPC and BCH coding only for payload data (so-called baseband frames, BBFrames), DVB-T2 uses two LDPC codes (16200 bits, rate 1/5 and rate 4/9) for the signalling of the current configuration of the DVB-T2 system.

 

Standard

DVB-T2

  Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system.
Organization ETSI
Publication 2009
Documents ETSI EN 302 755
Applications Terrestrial television broadcasting
LDPC Codes 13
  Block Length Submatrix Size Code Rates
  16200 360 1/5, 4/9, 3/5, 2/3, 11/15, 7/9, 37/45
  64800 360 1/2, 3/5, 2/3, 3/4, 4/5, 5/6

DVB-T2-Lite

The latest version of the DVB-T2 standard (V 1.3.1, Annex I) contains a new lightweight profile. The main objective of DVB-T2-Lite is the reduction of receiver complexity so that applications like mobile broadcasting become feasible. Therefore only the short LDPC frames with 16200 bits are contained within DVB-T2-Lite, resulting in a decreased LDPC/BCH decoder complexity.

Standard

DVB-T2-Lite

  Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system.
Organization ETSI
Publication 2012
Documents ETSI EN 302 755, V1.3.1
Applications Mobile broadcasting
LDPC Codes 7
  Block Length Submatrix Size Code Rates
  16200 360 1/5, 1/3, 2/5, 4/9, 3/5, 2/3, 11/15

DVB-C2

DVB-C2, the successor of DVB-C, contains a subset of the LDPC codes as defined in DVB-S2. A single code is used (64800 bits, code rate 2/3) that was introduced with DVB-T2 only. Since for cable networks high signal-to-noise ratios are common, the lower code rates have been removed allowing for a reduced decoder complexity. The code with the lowest code rate (16200 bits, code rate 4/9) is only used for the sending of signalling information.

 

Standard

DVB-C2

  Frame structure channel coding and modulation for a second generation digital transmission system for cable systems.
Organization ETSI
Publication 2010
Documents ETSI EN 302 769
Applications Digital transmission for cable networks.
IP Core Creonic DVB-C2 LDPC/BCH Decoder IP Core
LDPC Codes 11
  Block Length Submatrix Size Code Rates
  16200 360 4/9, 2/3, 11/15, 7/9, 37/45, 8/9
  64800 360 2/3, 3/4, 4/5, 5/6, 9/10

GMR-1

GEO-Mobile Radio (GMR) is a standard for satellite telephony that follows the GSM standard in many ways. Only the three lower layers of the OSI model differ between GMR and GSM (for GMPRS only the two lowest layers).

Two versions of the standard exist: GMR-1 (ETSI TS 101 376) and GMR-2 (ETSI TS 101 377). For GMR-1 three releases exist. Release 2 and Release 3 of GMR-1 adopted LDPC codes in 2008 and 2009, respectively. The standard is characterized by low throughput requirements of less than 1 Mbit/s. Puncturing, shortening, and repeating is applied in order to obtain different code rates and block lengths from the parity check matrices.

 

Standard

GMR-1 Release 2 (GMPRS-1),

GMR-1 Release 3 (GMR-3G)

Organization ETSI
Publication

2008 (GMPRS-1),

2009 (GMR-3G)

Documents

ETSI TS 101 376-5-3 V2.3.1 (GMPRS-1),

ETSI TS 101 376-5-3 V3.1.1 (GMR-3G)                                    

Applications

Satellite telephony

IP Core

Creonic GMR-1 LDPC Decoder IP Core

LDPC Codes

18

   
 

Block Length

Submatrix Size

Code Rates

  950 19 4/5
  960 32 2/3
  960 16 9/10
  976 61 1/2
  1908 53 2/3
  1920 32 4/5, 9/10
  2400 50 3/4
  2400 48 4/5
  4440 74 2/3, 4/5
  4464 62 1/2
  4480 64 9/10
  8880 74 2/3, 4/5, 9/10
  11100 74 4/5
  11136 87 3/4

 

IEEE

IEEE 802.3 (10 GBASE-T)

The IEEE 802.3 standard defines 10 gigabit Ethernet and was first published in 2002. In 2006 the IEEE 802.3an standard was released as an amendment to IEEE 802.3-2005. This amendment (10 GBASE-T) defines the 10 gigabit transmission over shielded or unshielded twisted pair cables for distances of up to 100 m. It uses LDPC codes for forward error correction. The IEEE 802.3an amendment was consolidated into IEEE 802.3-2008.

10 GBASE-T contains a special class of LDPC codes (so-called Reed-Solomon code-based LDPC codes or RS-LDPC codes). A Reed-Solomon code is used to define the generator matrix of the LDPC code. The LDPC code construction method guarantees that no cycles of length four are contained within the Tanner graph. Since the structure of the parity check matrix differs from all other standardized LDPC codes, different decoder architectures become mandatory.

 

Standard

IEEE 802.3an-2006,

IEEE 802.3-2008

 

Local and metropolitan area networks — Specific requirements

Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications

Organization IEEE
Publication

2006 (IEEE 802.3an-2006 as amendment to IEEE 802.3-2005),

2008

Documents

IEEE 802.3an-2006

IEEE 802.3-2008

LDPC Matrices

Applications Local and metropolitan area networks (LAN/MAN)
LDPC Codes 1
  Block Length Submatrix Size Code Rates
  2048 N/A 1723/2048

IEEE 802.11 (WiFi)

IEEE 802.11n is the successor of the IEEE 802.11a/b/g standards. It is particularly designed for higher throughputs. In contrast to the previous IEEE 802.11 standards, 11n can use multiple antennas (MIMO) allowing for the transmission of multiple data streams in parallel. The throughput of each data stream can be as high as 150 Mbit/s on the air interface. With a maximum of four antennas up to 600 Mbit/s are defined within the standard.

IEEE 802.11n defines twelve LDPC codes. Convolutional coding is mandatory, usage of LDPC coding is optional. The IEEE 802.11n codes are reused within the IEEE 802.11ac standard that is intended to further increase the transmission speed.

 

Standard

IEEE 802.11n-2009

IEEE 802.11-2012

 

Local and metropolitan area networks — Specific requirements

Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications

Amendment 5: Enhancements for Higher Throughputs

Organization IEEE
Publication

2009 (IEEE 802.11n-2009 as amendment to IEEE 802.11-2007)

Documents

IEEE 802.11n-2009

IEEE 802.11-2012

Applications Local and Metropolitan Area Networks (WLAN/WMAN)
IP Core Creonic IEEE 802.11n LDPC Decoder IP Core
LDPC Codes 12
  Block Length Submatrix Size Code Rates
  648 27 1/2, 2/3, 3/4, 5/6
 

1296

54 1/2, 2/3, 3/4, 5/6
 

1944

81 1/2, 2/3, 3/4, 5/6

IEEE 802.15.3c (60 GHz PHY)

IEEE 802.15.3-2003 is a standard for high data rate wireless personal area networks (WPAN). The IEEE 802.15.3c-2009 amendment describes an alternative PHY layer to the IEEE 802.15.3-2003 standard. The new mmWave PHY layer operates in the 60 GHz band (57 - 64 GHz) and allows for air throughputs of up to 5 Gbit/s. The standard uses LDPC codes for these high data rate modes. In particular, the single carrier (SC) mode and the high speed interface (HSI) mode use LDPC codes.

The standard defines five LDPC codes with two block lengths. In order to satisfy the high throughput requirements, special decoder architectures with an increased parallelism compared to other standards become mandatory.

 

Standard

IEEE 802.15.3c-2009

 

Local and metropolitan area networks — Specific requirements

Part 15.3: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for High Rate Wireless Personal Area Networks (WPANs)

Ammendment 2: Millimeter-wave-based Alternative Physical Layer Extension

Organization IEEE
Publication

2009 (as amendment to IEEE 802.15.3-2003)

Documents IEEE 802.15.3c-2009
Applications High Rate Wireless Personal Area Networks (WPAN)
IP Core Creonic IEEE 802.15.3c LDPC Decoder
LDPC Codes 5
  Block Length Submatrix Size Code Rates
  672 21 1/2, 3/4, 5/8, 7/8
  1440 96 14/15

IEEE 802.16 (Mobile WiMAX)

Along with DVB-S2 and the drafts of IEEE 802.11n, Mobile WiMAX (Worldwide Interoperability for Microwave Access) was one of the first standards to adopt LDPC codes for forward error correction. Mobile WiMAX was first defined in IEEE 802.16e-2005 as an amendment to IEEE 802.16-2004, and later consolidated into IEEE 802.16-2009. The throughputs of WiMAX systems are typically much less than 100 Mbit/s. Using the LDPC codes is optional.

The standard offers the highest block length flexibility of all standards that apply LDPC codes. Overall 19 block lengths are defined. Each block length comes with four code rates. For two code rates (rate 2/3 and rate 3/4 the standard defines two different LDPC codes with minor differences in error correction performance. All in all, 114 LDPC codes are contained within the WiMAX standard. However, only six parity check matrices are used to derive all other matrices. The usage of LDPC coding is optional, only convolutional coding is mandatory.

The same LDPC codes are used within the IEEE 802.22 and ITU-T G.hn standards, see below.

 

Standard

IEEE 802.16e-2005,

IEEE 802.16-2009

 

Local and metropolitan area networks

Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems

Organization IEEE
Publication

2006 (IEEE 802.16e-2005 as amendment to IEEE 802.16-2004),

2009
Documents

IEEE 802.16e-2005,

IEEE 802.16-2009
Applications Local and Wireless Metropolitan Area Networks (WLAN/WMAN)
LDPC Codes 114
  Block Length Submatrix Size Code Rates
  576 24 1/2, 2/3 (2x), 3/4 (2x), 5/6
 

672

28 1/2, 2/3 (2x), 3/4 (2x), 5/6
 

768

32 1/2, 2/3 (2x), 3/4 (2x), 5/6
 

...

... ...
 

2208

92 1/2, 2/3 (2x), 3/4 (2x), 5/6
 

2304

96 1/2, 2/3 (2x), 3/4 (2x), 5/6

IEEE 802.22 (WRAN)

IEEE 802.22 is a standard for wireless broadband access that uses the so-called white spaces between occupied channels in the TV frequency spectrum. The aim of the standard is to bring broadband access to low population density areas. The maximum data rate is about 20 Mbit/s. Due to its cognitive radio techniques, it has the potential to be applied in many regions worldwide.

As with ITU-T G.hn the standard uses the WiMAX (IEEE 802.16) LDPC codes as LDPC code basis. Compared to WiMAX two new block lengths are introduced (384 and 480 bits). Furthermore, it no longer contains two different codes for code rate 2/3 and code rate 3/4. Instead it adopted the codes 2/3B and 3/4A only. So despite the new block lengths, the number of LDPC codes decreased from 114 for WiMAX to 84 for IEEE 802.22. LDPC coding is optional, only convolutional coding is mandatory.

 

Standard

IEEE 802.22-2011

 

Wireless Regional Area Networks (WRAN)—Specific requirements

Part 22: Cognitive Wireless RAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Policies and Procedures for Operation in the TV Bands

Organization IEEE
Publication 2011
Documents IEEE 802.22-2011
Applications Wireless Regional Area Networks (WRAN)
LDPC Codes 84
  Block Length Submatrix Size Code Rates
  384 16 1/2, 2/3, 3/4, 5/6
  480 20 1/2, 2/3, 3/4, 5/6
  576 24 1/2, 2/3, 3/4, 5/6
 

...

... ...
 

2208

92 1/2, 2/3, 3/4, 5/6
 

2304

96 1/2, 2/3, 3/4, 5/6

 

Miscellaneous

ATSC 3.0

Advanced Television Systems Committee (ATSC) standards are a set of standards developed by the Advanced Television Systems Committee for digital television transmission over terrestrial, cable, and satellite networks.

The standard describes 24 LDPC codes that are similar to those of DVB-S2/-T2/-C2. The codes are concatenated with an inner BCH encoder.

Standard  
   
Organization ATSC
Publication  
Documents  
Applications Digital TV
IP Core Contact us!
LDPC Codes 24
  Block Length Information Word Submatrix Size Code Rates
  64800 8640 360 2/15
  64800 12960 360 3/15
  64800 17280 360 4/15
  64800 21600 360 5/15
  64800 25920 360 6/15
  64800 30240 360 7/15
  64800 34560 360 8/15
  64800 38880 360 9/15
  64800 43200 360 10/15
  64800 47520 360 11/15
  64800 51840 360 12/15
  64800 56160 360 13/15
  16200 2160 360 2/15
  16200 3240 360 3/15
  16200 4320 360 4/15
  16200 5400 360 5/15
  16200 6480 360 6/15
  16200 7560 360 7/15
  16200 8640 360 8/15
  16200 9720 360 9/15
  16200 10800 360 10/15
  16200 11880 360 11/15
  16200 12960 360 12/15
  16200 14040 360 13/15

DOCSIS 3.1

Data Over Cable Service Interface Specification is an international telecommunications standard that permits the addition of high-bandwidth data transfer to an existing cable TV (CATV) system.

The standard describes six LDPC codes, wherof one is taken from DVB-C2. For some codes puncturing and shortening is applied in order to obtain different block sizes and code rates.

Standard Data-Over-Cable Service Interface Specifications DOCSIS® 3.1
  Physical Layer Specification
Organization CableLabs
Publication 2013 (first release)
Documents CM-SP-PHYv3.1-I07-150910
Applications Data transfer over existing cable TV systems
IP Core DOCSIS 3.1 LDPC Decoder IP Cores
LDPC Codes 6
  Block Length Information Word Submatrix Size Code Rates
  160 80 16 1/2
  480 288 48 3/5
  16200 (DVB-C2) 14400 360 8/9
  1120 840 56 3/4
  5940 5040 180 28/33
  16200 14400 360 8/9

CCSDS

The CCSDS (The Consultative Committee for Space Data Systems) published an "experimental specification" for near-earth and deep space communication in 2007. The document was contributed to CCSDS by NASA (National Aeronautics and Space Administration). In 2011 the LDPC codes were adopted by a blue book as "recommended standard".

The documents describe ten LDPC codes, one optimized for near-earth communication (block length 8176), and all others optimized for deep space communication. The block lengths of the deep space codes were selected such that three lengths of information words exist (1024, 4096, and 16384).

 

Standard Low Density Parity Check Codes for Use in Near-Earth and Deep Space Applications, Orange Book, Issue 2, Experimental Specification.
  TM Synchronization and Channel Coding, Blue Book, Issue 2, Recommended Standard.
Organization CCSDS (The Consultative Committee for Space Data Systems)
Publication

2007 (Orange Book)

2011 (Blue Book)

Documents

CCSDS 131.1-O-2

CCSDS 131.0-B-2

Applications Near-Earth and deep space communication
IP Core CCSDS LDPC Encoder and Decoder
LDPC Codes 10
  Block Length Information Word Submatrix Size Code Rates
  8176 7154 511 7/8
  1280 1024 128 4/5
  1536 1024 256 2/3
  2048 1024 512 1/2
  5120 4096 512 4/5
  6144 4096 1024 2/3
  8192 4096 2048 1/2
  20480 16384 2048 4/5
  24576 16384 4096 2/3
  32768 16384 8192 1/2

CMMB

The Chinese Mobile Multimedia Broadcasting (CMMB) standard was published in 2006 by the Chinese State Administration of Radio, Film, and Television (SARFT). The standard is intended for handheld devices and supports data rates of up to 16 Mbit/s.

Two LDPC codes are defined, both of the same block length. While in DVB-x2 an outer BCH decoder is applied, CMMB concatenates the LDPC decoder with an outer Reed-Solomon decoder. Each LDPC code can be concatenated with three diffferent RS-Codes of different rates. But it is also possible to omit the outer RS-Code.

 

Standard CMMB
  Mobile Multimedia Broadcasting Part 1: Framing Structure,
Channel Coding and Modulation for Broadcasting Channel
Organization

SARFT (Chinese)

SARFT (English with Google Translator)
Publication 2006
Documents GY/T 220.1-2006
Applications Mobile Broadcasting
LDPC Codes 2
  Block Length Submatrix Size Code Rates
  9216 256 1/2, 3/4

DTMB (DMB-T/H)

Digital Terrestrial Media Broadcast (DTMB) is a Chinese standard for digital broadcasting. Unlike CMMB, it is intended for fixed terminals and supports HDTV transmission. It will replace the analog TV transmission in China. Data rates of up to 32 Mbit/s are supported.

The standard defines three LDPC codes of the same block length. The forward error correction uses an outer BCH decoder. A specialty of the defined codes is the submatrix size of 127. This is a prime number that has some negative influence on an efficient hardware decoder realization.

 

Standard

DTMB

  Framing structure, channel coding and modulation for digital television terrestrial broadcasting system
Organization SAC (Standardization Administration of China)
Publication 2006
Documents GB 20600-2006
Applications Digital Broadcast (terrestrial / handheld)
LDPC Codes 3
  Block Length Submatrix Size Code Rates
  7493 127 2/5, 3/5, 4/5

ITU-T G.hn (G.9960)

G.hn is the name for home grid technologies defined by the International Telecommunication Unit (ITU). The recommendation G.9960 defines physical layer and system architecture while recommendation G.9961 defines the data link level. The standard defines the communication over three different types of wires: coaxial cables (cable networks), telephone lines, and power lines. G.hn systems achieve throughputs of up to 1 Gbit/s.

The standard uses a subset of the WiMAX (IEEE 802.16) LDPC codes in order to derive its own LDPC codes with different block lengths. While the WiMAX codes are defined for a block length of 2304, the G.hn standard defines seven different block lengths with a total of three different code rates (rate 1/2, rate 2/3, rate 5/6). The shortest block length is used for header information only, while all other block lengths hold payload information. The standard defines puncturing patterns to increase the code rate beyond rate 5/6. By the removal of parity bits from the highest rate codes before transmission, the code rates 16/18 and 20/21 are obtained.

 

Standard

ITU-T G.hn

 

Series G: Transmission Systems and Media, Digial Systems and Networks

G.9960: Unified high-speed wire-line based home networking transceivers - System architecture and physical layer specification

Organization ITU (International Telecommunication Unit)
Publication 2009
Documents ITU-T G.9960
Applications Wired home networking (e.g., power line communication)
LDPC Codes 7
  Block Length Information Word Submatrix Size Code Rates
  336 168 14 1/2
  1152 960 48 5/6
  1440 960 60 2/3
  1920 960 80 1/2
  5184 4320 216 5/6
  6480 4320 270 2/3
  8640 4320 360 1/2

WiMedia 1.5 UWB

The WiMedia Alliance is a non-profit organization that promotes and certifies ultra-wide band (UWB) technologies. In version 1.5 of its physical layer, the WiMedia standard adopted LDPC codes for high data rates (payload throughputs of up to 1 Gbit/s). For lower rates, convolutional codes are used. The standard defines two block lengths: 1200 and 1320. The long blocks are obtained by a re-encoding of the short blocks with a rate 10/11 LDPC code. These additional parity bits are transmitted on the guard tones of an OFDM symbol for throughputs of 640 Mbit/s and above. The receiver, however, is allowed to ignore these 120 additional parity bits for decoding.

 

Standard

MultiBand OFDM Physical Layer Specification

  PHY Specification: Final Deliverable 1.5
Organization WiMedia Alliance
Publication 2009
Documents WiMedia PHY Specification 1.5
Applications Wireless Personal Area Networks (WPAN)
IP Core Creonic WiMedia 1.5 LDPC Encoder/Decoder IP Core
LDPC Codes 8
  Block Length Submatrix Size Code Rates
  1200 30 1/2, 5/8, 3/4, 4/5
  1320 30 5/11, 25/44, 15/22, 8/11

 

Drafts

DVB-NGH

DVB-NGH is a draft standard for digital broadcasting systems for handheld devices. Parts of the standards are similar to DVB-T2-Lite. Hence, the maximum block length of the LDPC codes is 16200 bits. Seven new LDPC codes were added to the DVB family of standards (16200 bit codewords with rates 4/15, 7/15, 8/15, 9/15; 4320 bit codewords with rates 1/5 and 1/2, 8640 bit codeword with rate 1/4). All other codes have been used before, e.g., in DVB-S2.

DVB-NGH uses two LDPC codes (4320 bits, rate 1/5 and 8640 bits, rate 1/2) for signalling the current configuration of the DVB-NGH system. The 8640 bits code is an extended LDPC code based on a code with 4320 bits and rate 1/2.

Standard

DVB-NGH

  Next Generation broadcasting system to Handheld, physical layer specification (DVB-NGH)
Organization ETSI
Publication 2012 (draft)
Documents ETSI EN 303 105
Applications Terrestrial television broadcasting for handhelds
LDPC Codes

12

  Block Length Submatrix Size Code Rates
  4320 72 1/5, 1/2
  8640 72 1/4
  16200 360 3/15, 4/15, 5/15, 6/15, 7/15, 8/15, 9/15, 10/15, 11/15

IEEE 802.11ac (WiFi)

The main objective of IEEE 802.11ac is to increase the throughputs of the previous IEEE 802.11 standards. Compared to IEEE 802.11n, the draft of IEEE 802.11ac allows for eight antennas (11n: four), 256-QAM modulation (11n: 64-QAM), and channel bandwidths of up to 160 MHz (11n: 40 MHz). The changes in the standard allow for a theoretical throughput of up to 7 Gbit/s. The LDPC codes are the same as in IEEE 802.11n.

 

Standard

IEEE 802.11ac

   
Organization IEEE
Publication

Draft

Documents IEEE P802.11ac
Applications Local and Metropolitan Area Networks (WLAN/WMAN)
IP Core Creonic IEEE 802.11ac LDPC Decoder IP Core
LDPC Codes 12
  Block Length Submatrix Size Code Rates
  648 27 1/2, 2/3, 3/4, 5/6
 

1296

54 1/2, 2/3, 3/4, 5/6
 

1944

81 1/2, 2/3, 3/4, 5/6

IEEE 802.11ad (WiGig)

IEEE 802.11ad is an amendment to IEEE 802.11-2007. Its intention is to modify the physical and MAC layer of the standard to enable a high throughput data transmission in the 60 GHz frequency band.

The standard defines four LDPC codes that are different from the codes defined in IEEE 802.11n and IEEE 802.11ac. LDPC coding is mandatory, no other coding scheme is specified. The increased submatrix size (42) of the parity check matrices relaxes the problem of achieving Gbit throughputs for such small block lengths in comparison to IEEE 802.11ac/n. In those standards the submatrix size is only 27 for a block length of 648 bits.

 

Standard

IEEE 802.11ad

 

Local and Metropolitan Area Networks – Specific Requirements

Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications

Amendment 5: Enhancements for Very High Throughput in the 60GHz Band

Organization IEEE
Publication

Draft (amendment to IEEE 802.11-2007)

Documents IEEE P802.11ad
Applications Local and Metropolitan Area Networks (WLAN/WMAN)
IP Core Creonic IEEE 802.11ad LDPC Decoder
LDPC Codes 4
  Block Length Submatrix Size Code Rates
  672 42 1/2, 5/8, 3/4, 13/16