Performance of multi level error correction in binary holographic meniory
نویسندگان
چکیده
At the Optical Computing Lab in the Jet Propulsion Laboratory (JPL) a binary holographic data storage system was designed and tested with methods of recording and retrieving the binary information. Levels of error correction were introduced to the system including pixel averaging, thresholding, and parity checks. Errors were artificially introduced into the binary holographic data storage system and were monitored as a function of the defect area fraction, which showed a strong influence on data integrity. Average area fractions exceeding one quarter of the bit area caused unrecoverable errors. Efficient use of the available data density was discussed.
منابع مشابه
Conservative Arrays: Multidimensional Modulation Codes for Holographic Recording [Correspondence] - Information Theory, IEEE Transactions on
AbstructIn holographic storage, two-dimensional arrays of binary data is optically recorded in a medium via an interference process. To ensure optimum operation of a holographic recording system, it is desirable that the patterns of 1’s (light) and 0’s (no light) in the recorded array satisfy the following modulation constraint: in each row and column of the array there are at least t transitio...
متن کاملConservative arrays: multidimensional modulation codes for holographic recording
AbstructIn holographic storage, two-dimensional arrays of binary data is optically recorded in a medium via an interference process. To ensure optimum operation of a holographic recording system, it is desirable that the patterns of 1’s (light) and 0’s (no light) in the recorded array satisfy the following modulation constraint: in each row and column of the array there are at least t transitio...
متن کاملOptimizing the holographic digital data storage channel
Holographic storage has the potential to become a digital data storage technology with fast readout and high density. Computer users have come to expect, however, that data retrieved from their storage devices will be retrieved error-free (with a probability of error <10−12). In both conventional storage devices and holographic data storage, achieving this degree of reliability involves a good ...
متن کاملNew multilevel codes over GF(q)
In this paper, we apply set partitioning to multi-dimensional signal spaces over GF(q), particularly GFq-l(q) and GFq(q), and show how to construct both multi-level block codes and multi-level trellis codes over GF(q). We present two classes of multi-level (n, k, d) block codes over GF(q) with block length n, number of information symbols k, and minimum ,1-1 • { d } distance d_n >_ d, where n =...
متن کاملJoint Rewriting and Error Correction in Flash Memories
The current NAND flash architecture requires block erasure to be triggered in order to decrease the level of a single cell inside a block. Block erasures degrade the quality of cells as well as the performance of flash memories. One solution is to model flash memories as write-once memories (WOM) where the level of a cell can only be increased. Various coding schemes for WOM can then be applied...
متن کامل