Data processing apparatus and method for d=2 optical channels

Details Data processing apparatus and method for d=2 optical channels Data processing apparatus and method for d=2 optical channels

2006-07-18

2006-07-18

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

Binary pulse train information signal

Including sampling or a/d converting

C714S746000

Reexamination Certificate

active

07079467

ABSTRACT:
A data processing apparatus having a partial response forward equalizer (filter) with sufficient number of taps to result in 7-tap target response, designed by jointly optimizing the target response and the target coefficients to maximize an appropriate signal-to-noise ratio (SNR) at the detector input, followed by a new post-processing scheme enhances performance of the threshold based bit-by-bit detector designed for the d=2 optical channels. The resulting performance of the proposed scheme over a range of channel densities of 4.5 and below (used on EFM/EFMPlus coded channels for CD/DVD), is close to maximum-likelihood bound (MLB), and it is better than that of other schemes at channel densities of 4.5 and higher. Advantageously, the detector of the invention is simple in structure compared to conventional partial response Viterbi detector schemes. By processing the detected data in accordance with a set of data correction rules, the invention provides advantageous enhanced detection capacity.

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