The modulation code used in a digital versatile disc (DVD) recording system is referred to as the efmplus code with a rate of 8/16. We present a new time-varying maximum transition run (TMTR) code for DVD recording sy...
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The modulation code used in a digital versatile disc (DVD) recording system is referred to as the efmplus code with a rate of 8/16. We present a new time-varying maximum transition run (TMTR) code for DVD recording systems, which has a rate 8/11 higher than the efmplus code and a lower power spectral density (PSD) at low frequencies. Computer simulations indicate that the proposed TMTR code outperforms the efmplus code when applied to a partial response optical recording channel. The turbo (iterative) decoding for the TMTR-coded partial response optical recording channel is also investigated, in which the TMTR-coded partial response channel is viewed as the inner code and two parallel concatenated convolutional codes (PCCC's) as the outer code. The error performance of the proposed coding scheme is investigated and compared with the conventional coding scheme, in which both the TMTR code and partial response channel are decoded or detected independently. Simulation results reveal that a coding gain of more than 3 dB can be achieved over the conventional coding scheme(1).
Constructions are presented of finite-state encoders for certain (d, k) runlength-limited (RLL) constraints with direct current control. In particular, an example is provided for a rate 8:16 encoder for the (2,10)-RLL...
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Constructions are presented of finite-state encoders for certain (d, k) runlength-limited (RLL) constraints with direct current control. In particular, an example is provided for a rate 8:16 encoder for the (2,10)-RLL constraint that requires no lookahead in decoding, thus, performing favorably compared to the efmplus code used in the DVD standard.
We present a powerful error control decoder which can be used in all of the commercial D VD systems. The decoder exploits the error information from the modulation decoder in order to increase the error correcting cap...
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We present a powerful error control decoder which can be used in all of the commercial D VD systems. The decoder exploits the error information from the modulation decoder in order to increase the error correcting capability. We can identify that the modulation decoder in DVD system can detect errors more than 60% of total errors when burst errors are occurred. In results, for a decoded block, error correcting capability of the proposed scheme is improved up to 25% more than that of the original error control decoder. In addition, the more the burst error length is increased, the better the decoder performance. Also, a pipeline-balanced RSPC decoder with a low hardware complexity is designed to maximize the throughput. The maximum throughput of the RSPC decoder is 740Mbps@100MHz and the number of gate counts is 20.3K for RS (182, 172, 11) decoder and 30.7K for RS (208, 192, 17) decoder, respectively(1).
We present a powerful error control decoder which can be used in all kinds of digital versatile disk (DVD) systems. The decoder exploits the error information from the modulation decoder in order to increase the error...
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We present a powerful error control decoder which can be used in all kinds of digital versatile disk (DVD) systems. The decoder exploits the error information from the modulation decoder in order to increase the error correcting capability. We can identify that the modulation decoder in DVD system can detect errors more than 60% of total errors when burst errors are occurred. In results, for a decoded block, error correcting capability of the proposed scheme is improved up to 25% more than that of the original error control decoder. Also, a pipeline-balanced Reed-Solomon Product code (RSPC) decoder with a low hardware complexity is designed to maximize the throughput. The maximum throughput of the RSPC decoder is 740 Mbps at 100 MHz and the number of gate counts is 20.3 K for RS(182, 172, 11) decoder and 30.7 K for RS(208, 192, 17) decoder, respectively.
This paper introduces a run-length-limited (RLL) (3, 11) code and compares its performance with that of the efmplus code using four different detection methods including partial response maximum likelihood (PRML), fix...
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This paper introduces a run-length-limited (RLL) (3, 11) code and compares its performance with that of the efmplus code using four different detection methods including partial response maximum likelihood (PRML), fixed delay tree search with decision feedback (FDTS/DF), partial response with decision feedback equalizer (PR-DFE) and decision feedback equalizer (DFE). The advantages of the proposed code are: (1) the larger density ratio and (2) the simple encoder/decoder.
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