LDPC Decoder Applications

5G NR is the mobile broadband standard of the 5th generation. A new rate compatible structure for LDPC codes are employed for channel coding to fulfill the broad applications supported by the standard.
Creonic’s 5G LDPC Decoder IP Core provides a perfect solution for this new LDPC structure with high level of flexibility while maintaining high throughput and low latency as required by the standard.

 

Standard	Low density parity check coding for 5G-NR
Organization	3GPP (3rd Generation Partnership Project)
Publication	5G-NR Physical layer procedures for data (3GPP TS 38.214 version 15.10.0 Release 15)
Documents	3GPP TS 38.214 version 15.10.0 Release 15
Applications	5G modem chipset for base station (BS) or user equipment (UE)
IP Core	Creonic LDPC Decoder and Encoder
LDPC Codes	3978   Basegraph 1: code rate 22/68 to 22/26 Basegraph 2: code rate 10/52 to 10/14 Lifting size set 0 to 7

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)

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 Cores	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 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

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

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 Cores	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

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	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

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 802.11n 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 802.15.3-2003 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)/td>
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

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 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

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

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	Creonic 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

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	Creonic 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

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)
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

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

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

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

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

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 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