DocumentCode :
889834
Title :
Novel Techniques to Minimize the Error Propagation of Decision Feedback Equalizer in 8VSB DTV System
Author :
Baek, Jong-Seob ; Park, Sung-Woo ; Seo, Jong-Soo
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul
Volume :
53
Issue :
2
fYear :
2007
fDate :
6/1/2007 12:00:00 AM
Firstpage :
504
Lastpage :
513
Abstract :
In this paper, novel and yet simple techniques are presented to minimize the error propagation caused by the large precursors and postcursors of the decision feedback equalizer (DFE) in 8VSB DTV system. A technique that selects a reference tap (symbol timing of DFE) from an estimated channel impulse response (CIR) is presented to minimize the effect of the large precursors. Another technique that selects the reference tap position, i.e., decision delay in a feedforward filter (FFF), from the estimated CIR and the amplitude of the selected reference tap is proposed to minimize the effect of large postcursors. The combined structure of a feedback filter (FBF) and Viterbi decoder for use in 8VSB DTV system is also proposed to replace the past unreliable decision symbols in FBF as well as to reduce the decision error probability. Simulation results show that our proposed DFE can prevent effectively the error propagation, in particular, by changing the reference tap and its position in FFF according to the channel condition. It is also shown that an echo removing capability of the proposed DFE, where 400 and 620taps are used for the FFF and FBF, respectively, is greater than that of conventional DFEs by about -20 mus in the single pre-echo of -10 dB channel and by about 10 mus in the single post-echo of -1 dB channel
Keywords :
Viterbi decoding; channel estimation; decision feedback equalisers; digital television; error statistics; filtering theory; DFE; FFF; VSB DTV system; Viterbi decoder; channel impulse response estimation; decision delay; decision feedback equalizer; error probability; error propagation minimization; feedforward filter; Amplitude estimation; Decision feedback equalizers; Decoding; Delay effects; Delay estimation; Digital TV; Field-flow fractionation; Filters; Timing; Viterbi algorithm; Channel estimation; decision feedback equalizers; digital TV; error propagation;
fLanguage :
English
Journal_Title :
Broadcasting, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9316
Type :
jour
DOI :
10.1109/TBC.2007.896949
Filename :
4215102
Link To Document :
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