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92 commits 10 branches 2 tags 508 KiB
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23 commits

Author SHA1 Message Date
Ahmet Inan
0b37102383 getting rid of obsolete version 2019-10-01 22:17:04 +02:00
Ahmet Inan
00246f2a69 skip write disable code if no repeat is necessary 2019-09-30 12:44:13 +02:00
Ahmet Inan
bd3bf1d277 use do while instead of for loop 2019-09-29 22:25:55 +02:00
Ahmet Inan
65863e76b6 repeat layers with DDSMs to resolve write conflicts 
Idea taken from:

HIGH-SPEED CONFLICT-FREE LAYERED LDPC DECODER FOR THE DVB-S2, -T2 AND -C2 STANDARDS
By Cédric Marchand, Laura Conde-Canencia and Emmanuel Boutillon - 2013
 2019-09-29 13:06:23 +02:00
Ahmet Inan
488a8cbe2b keep locations sorted by offset per layer 2019-09-29 10:06:14 +02:00
Ahmet Inan
02d5b5f12c keep word offset and shift paired 2019-09-29 10:02:01 +02:00
Ahmet Inan
a61a7d05cf step pointers after updating at the end 2019-09-28 23:50:34 +02:00
Ahmet Inan
65dd0fab50 moved word offset and shift calc code to the top 2019-09-28 23:23:18 +02:00
Ahmet Inan
969c43f016 use horizontal rotation helper 2019-09-24 00:07:14 +02:00
Ahmet Inan
a10cc6afcb disable OMS code path if BETA is zero 2019-09-23 14:14:53 +02:00
Ahmet Inan
e7dbd7400f added self correcting update of outgoing values 2019-09-23 13:54:23 +02:00
Ahmet Inan
974c4c582d clamp outgoing values before adding 2019-09-23 13:37:15 +02:00
Ahmet Inan
8f5d8d42ae renamed finalp() to cnp() and changed args 2019-09-23 13:07:38 +02:00
Ahmet Inan
717d482822 shuffle codeword for SIMD aligned memory access 
Idea taken from:

Low cost LDPC decoder for DVB-S2
by John Dielissen, Andries Hekstra and Vincent Berg - 2006
 2019-09-23 12:00:06 +02:00
Ahmet Inan
b41799c84d added LDPC decoder version with fully computed LUT 2018-12-16 09:42:02 +01:00
Ahmet Inan
6af9798553 calculate first q entries directly 2018-12-15 19:42:58 +01:00
Ahmet Inan
86bf81dd2d got rid of some modulo operations 2018-12-15 17:09:03 +01:00
Ahmet Inan
4e39392acf only need first q entries 2018-12-15 15:05:19 +01:00
Ahmet Inan
ce9674883c flattened first parity handling 2018-12-15 12:12:56 +01:00
Ahmet Inan
584f6c0d9d use max value for fake parity bit to stay on the safe side 2018-12-14 20:42:25 +01:00
Ahmet Inan
3060e82da6 got rid of exclusive_reduce 2018-12-13 13:23:41 +01:00
Ahmet Inan
3e881ce049 accelerate decoder using SIMD 
Also added a fake parity bit to reduce code duplication.
The fake parity bit seems not to affect the decoding performance.
 2018-12-13 11:21:58 +01:00
Ahmet Inan
199a988def added LDPC encoder and layered decoder 
lifted from my LDPC project:
https://github.com/xdsopl/LDPC
 2018-12-13 11:19:31 +01:00