Patent ID: 8467477
Filing Date: 2013-06-18
Classification: H03M

Abstract:
1. A decoding system for Low-density Parity-check codes (LDPC codes) concatenated with 4 Quadrature Amplitude Modulation Nordstrom-Robinson codes (4QAM-NR codes) in digital terrestrial multimedia broadcast (DTMB) system, comprising: a channel estimator and equalizer, for receiving input signals y a data partition device, connected to the channel estimator and equalizer, for performing a data partition on the estimation input signals an NR decoder, connected to the data partition device, for performing a decoding operation on the partition estimation input signals Z a time de-interleaver, connected to the NR decoder, for producing a plurality of time de-interleaved symbols {circumflex over (X)} a noise power estimator, for estimating a noise power and producing a noise variance σ a log-likelihood ratio (LLR) computation device, connected to the noise power estimator and the time de-interleaver, for computing and producing an LLR based on the plurality of time de-interleaved symbols {circumflex over (X)} an LDPC decoder, connected to the LLR computation device, for producing a codeword based on the LLR; wherein the channel estimator and equalizer comprises: a phase rotation device, connected to the channel estimator and the FFT device, for producing the corresponding channel estimation signals Ĉ