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1. (WO2018033836) LDPC PERFORMANCE IMPROVEMENT USING SBE-LBD DECODING METHOD AND LBD COLLISION REDUCTION

Pub. No.:    WO/2018/033836    International Application No.:    PCT/IB2017/054888
Publication Date: Fri Feb 23 00:59:59 CET 2018 International Filing Date: Fri Aug 11 01:59:59 CEST 2017
IPC: H03M 13/03
H03M 13/21
H03M 13/11
G06F 11/10
Applicants: HUGHES NETWORK SYSTEMS, LLC
Inventors: BHATIA, Gaurav
HUANG, Qiujun
EROZ, Mustafa
Title: LDPC PERFORMANCE IMPROVEMENT USING SBE-LBD DECODING METHOD AND LBD COLLISION REDUCTION
Abstract:
Systems and methods are described for performing Layered Belief LDPC decoding on received Standard Belief LDPC encoded data bursts. In on implementation, a receiver: demodulates a signal, the demodulated signal including a noise corrupted signal derived from a codeword encoded using standard belief LDPC encoding; converts the noise corrupted signal derived from the standard belief LDPC encoded codeword to a noise corrupted signal derived from a layered belief LDPC encoded codeword; and decodes the noise corrupted signal derived from the layered belief LDPC encoded codeword using a layered belief LDPC decoder. In further implementations, systems are described for reducing collisions in Layered Belief LDPC decoders that occur when multiple parity checks need the same soft decision at the same time. In these implementations, elements in an original LBD decoder table are rearranged to increase the distance between elements specifying the same location in a RAM where soft decisions are stored.