Abstract
An enhanced 2/3 four-ary modulation code using soft-decision Viterbi decoding is proposed for four-level holographic data storage systems. While the previous four-ary modulation codes focus on preventing maximum two-dimensional intersymbol interference patterns, the proposed four-ary modulation code aims at maximizing the coding gains for better bit error rate performances. For achieving significant coding gains from the four-ary modulation codes, we design a new 2/3 four-ary modulation code in order to enlarge the free distance on the trellis through extensive simulation.The free distance of the proposed four-ary modulation code is extended from 1.21 to 2.04 compared with that of the conventional four-ary modulation code. The simulation result shows that the proposed four-ary modulation code has more than 1 dB gains compared with the conventional four-ary modulation code.
| Original language | English |
|---|---|
| Article number | 09NA06 |
| Journal | Japanese journal of applied physics |
| Volume | 56 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2017 Sep |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2017R1A2B3006025).
Publisher Copyright:
© 2017 The Japan Society of Applied Physics.
All Science Journal Classification (ASJC) codes
- Engineering(all)
- Physics and Astronomy(all)