Performance Analysis of the Channel Equalizers for Partial Response Channels 


Vol. 27,  No. 8, pp. 739-752, Aug.  2002


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  Abstract

Recently, to utilize the limited bandwidth effectively, the concept of partial response (PR) signaling has widely been adopted in both the high-speed data transmission and high-density digital recording/playback systems such as digital microwave, digital subscriber loops, hard disk drives, digital VCR's and digital versatile recordable disks and so on. This paper is concerned with adaptive equalization of partial response channels particularly for the magnetic recording channels. Specifically we study how the PR channel equalizers work for different choices of desired or reference signals used for adjusting the equalizer weights. In doing so, we consider three different configurations that are actually implemented in the commercial products mentioned above. First of all, we show how to compute the theoretical values of the optimum Wiener solutions derived by minimizing the mean-squared error (MSE) at the equalizer output. Noting that this equalizer MSE measure cannot be used to fairly compare (he three configurations, we propose to use the data MSE that is computed just before the final detector for the underlying PR system. We also express the data MSE in terms of the channel impulse response values, source data power and additive noise power, thereby making it possible to compare (he performance of the configurations under study. The results of extensive computer simulation indicate that our theoretical derivation is correct with high precision. Comparing the three configurations, it also turns out that one of the three configurations needs to be further improved in performance although it has an apparent advantage over the others in terms of memory size when implemented using RAM's for the decision feedback part.

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  Cite this article

[IEEE Style]

S. Lee and J. Lee, "Performance Analysis of the Channel Equalizers for Partial Response Channels," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 8, pp. 739-752, 2002. DOI: .

[ACM Style]

Sang-Kyung Lee and Jae-Chon Lee. 2002. Performance Analysis of the Channel Equalizers for Partial Response Channels. The Journal of Korean Institute of Communications and Information Sciences, 27, 8, (2002), 739-752. DOI: .

[KICS Style]

Sang-Kyung Lee and Jae-Chon Lee, "Performance Analysis of the Channel Equalizers for Partial Response Channels," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 8, pp. 739-752, 8. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880