Time - interval quantization in a high - density optical data storage system
نویسنده
چکیده
A hardware system for investigating Intersymbol Interference (ISI) in an optical data storage system has been designed and constructed by the author. The system consists of a pattern generator which produces data patterns of variable lengths and bit rates to be recorded on the optical disk. Data marks of the readback signal are quantized by a high-speed clock-counter system, and transferred in parallel to a personal computer. SNR values for collected data are obtained by computing mark size deviations of the readback signal from the original marks. A pseudo random pattern of 31 bits is used for calculating SNR values for different spot sizes. Finally, Additive Interleaving Detection (AID) technique is implemented to compute another set of SNR values. 3 to 5 dB SNR improvements are observed when the AID technique is used.
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