| Autor: |
Dariush Divsalar, Richard D. Wesel, Adam R. Williamson, Sudarsan V. S. Ranganathan, Kasra Vakilinia |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
ITW |
| DOI: |
10.1109/itw.2014.6970814 |
| Popis: |
One advantage of incremental transmissions with feedback in point-to-point memoryless channels is a reduction in average blocklength required to approach capacity. This paper optimizes the size of each incremental transmission for non-binary (NB) LDPC codes to maximize throughput in VLFT and two-phase VLF settings. The optimization problem uses an approximation based on the inverse-Gaussian p.d.f. of the blocklength required for successful decoding. By using the optimized incremental transmission lengths (with an average blocklength of less than 500 bits), NB-LDPC codes for VLFT setting limited to 5 transmissions achieve a throughput greater than 96% of that obtained by an unlimited-transmission VLFT scheme with the same average blocklength. With a similar average blocklength, a two-phase VLF system limited to five transmissions (with optimized lengths) using the binary image of NB-LDPC codes achieves greater than 90% of the capacity of binary-input AWGN channel with SNR=2 dB. Two-phase VLF does not match the throughput of VLFT, but it is more practical than VLFT because it does not assume noiseless transmitter confirmation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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