This paper explores an efficient rate-adaptive error correction coding scheme with a nonbinary (NB) GF(2(q)) extension of raptor-like (RL) quasi-cyclic (QC) subclass of Low-Density Parity-Check (LDPC) codes. In the NB...
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This paper explores an efficient rate-adaptive error correction coding scheme with a nonbinary (NB) GF(2(q)) extension of raptor-like (RL) quasi-cyclic (QC) subclass of Low-Density Parity-Check (LDPC) codes. In the NB RL scheme, the high-rate (HR) code vectors are supplemented by the incremental redundancy (IR) symbols, generated by the parity check equations over GF(2(q)). We provide a procedure for constructing short NB QC-RL-LDPC codes with low encoding complexity and optimized graph structures. The proposed method is based on the graph optimization of the HR code and Monte Carlo simulation-supported placement of additional NB parity checks in the IR graph. Numerical simulations validate the approach, demonstrating the effectiveness of the constructed short NB QC-RL-LDPC codes, compared to the 5G standard binary coding with IR. Further exploration shows that, when the NB QC-RL-LDPC coding over Galois Field GF(2(q)) is combined with adaptive 2(X)-ary digital modulations, which provides flexibility in diversifying modulation orders by mixing higher order modulations for initial HR transmission with a lower order for IR, it can improve performance in the low Signal to Noise Ratio regime. In conclusion, this investigation shows that the raptor-Like nonbinary coding, when the code and the transmission scheme are designed with proper optimizations, exhibits a performance improvement over the counterpart binary coding.
This paper proposes and investigates the use of Application Layer Forward Error Correction (AL-FEC) based on raptor codes for digital television DVB-T (Digital Video Broadcasting - Terrestrial) services. By means of A...
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ISBN:
(纸本)9781424425907
This paper proposes and investigates the use of Application Layer Forward Error Correction (AL-FEC) based on raptor codes for digital television DVB-T (Digital Video Broadcasting - Terrestrial) services. By means of AL-FEC it is possible to increase the robustness of traditional DVB-T transmissions for the provision of mobile TV. The AL-FEC protection is introduced in a backwards compatible way with the legacy DVB-T standard and does not alter the originally transmitted multimedia data. In order to evaluate the performance of AL-FEC in mobile channel environments, we employ laboratory measurements along with dynamic shadowing simulations. The paper presents direct comparisons with the link layer protection mechanism of DVB-H - referred to as MPE-FEC (Multi Protocol Encapsulation - Forward Error Correction) and illustrates the link margin gains that can be achieved in mobile DVB-T reception by means of AL-FEC.
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