Title :
Precoding and the MMSE-DFE
Author :
Wesel, Richard D. ; Cioffi, John M.
Author_Institution :
Inf. Syst. Lab., Stanford Univ., CA, USA
fDate :
31 Oct-2 Nov 1994
Abstract :
This paper provides upper and lower bounds on the information rates achievable with a minimum mean square error (MMSE) Tomlinson-Harishima precoder (THP) assuming ideal interleaving. We also give an exact formula for zero-forcing (ZF) THP achievable information rates. At high SNR, the performance of the MMSE-THP and the ZF-THP identically suffer only the 2.55 bit or 1.53 dB -shaping” loss from capacity. At low SNR, shaping loss is negligible, but the THP systems again do not achieve capacity, largely due to the receiver modulo operation (and interleaving in the MMSE case). In general, the MMSE-THP outperforms the ZF-THP at low SNR. We show these effects for an example ISI channel
Keywords :
Gaussian channels; channel capacity; decision feedback equalisers; encoding; interleaved codes; intersymbol interference; least mean squares methods; AWGN channel; ISI channel; MMSE-DFE; SNR; Tomlinson-Harishima precoder; ideal interleaving; information rates; lower bounds; minimum mean square error; receiver modulo operation; shaping loss; upper bounds; zero-forcing THP; AWGN channels; Channel capacity; Decision feedback equalizers; Filters; Information rates; Information systems; Intersymbol interference; Laboratories; Mean square error methods; Transmitters;
Conference_Titel :
Signals, Systems and Computers, 1994. 1994 Conference Record of the Twenty-Eighth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-6405-3
DOI :
10.1109/ACSSC.1994.471638
