Adaptive code modulation for 2D optical memories

Volumetric and page oriented optical storage systems have a great potential for high data density and high speed through page oriented data access (Haichuan Zhang et al, Proc. 18th IEEE Symp. Mass Storage Sys., 2001). However, in order to be practical, they have to maintain data integrity using error correction and modulation codes. The coding comes at a cost of spatial overhead of codeword size over the source data size, and processing time overhead for encoding and decoding. Our proposed adaptive modulation scheme strives to minimize both overheads. It achieves utilization of 74% with constant time complexity, which is competitive with other recently proposed schemes for page-oriented memories.