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Comments on "on Probability of Error in Decision Feedback Equalizer"

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2 Author(s)
E. J. Hilliard ; Naval Underwater Systems Center Headquarters, Newport, RI 02840 ; R. F. Pinkos

The above-mentioned paper [1] derives bounds on the error probability of a decision feedback equalizer (DFE) which are claimed to be significantly tighter than the earlier upper bound of [2]. Unfortunately, [1] makes an unsupportable assumption which reddars the conclusions incorrect. We show that valid bounds can be obtained by the methods of [1], but that for the numerical example of [2] , the resulting upper bound is never tighter than, and sometimes significantly weaker than, that derived in [2]. Similarly, a lower bound derived by the method of [1] is shown for the same numerical example to be very close to the error-free past lower bound previously known.

Published in:

IEEE Transactions on Aerospace and Electronic Systems  (Volume:AES-14 ,  Issue: 2 )