TY - JOUR

T1 - Design of parallel Tomlinson-Harashima precoders

AU - Gu, Yongru

AU - Parhi, Keshab K.

PY - 2008/5

Y1 - 2008/5

N2 - Like decision feedback equalizers (DFEs), Tomlinson-Harashima precoders (TH precoders) contain nonlinear feedback loops, which limit their use for high-speed applications. Unlike in DFEs, where the output levels of the nonlinear devices are finite, in TH precoders the output levels of the modulo devices are either infinite or finite but very large. Thus, it is difficult to apply look-ahead and pre-computation techniques to speed up TH precoders, which were successfully applied to design parallel and pipelined infinite impulse response (IIR) filters and DFEs in the past. However, a TH precoder can be viewed as an IIR filter with an input equal to the sum of the original input to the TH precoder and a finite-level compensation signal. Based on this point of view, a novel parallel architecture is proposed to speed up TH precoders. This architecture can be used in many high-speed applications, such as 10-Gb Ethernet over copper.

AB - Like decision feedback equalizers (DFEs), Tomlinson-Harashima precoders (TH precoders) contain nonlinear feedback loops, which limit their use for high-speed applications. Unlike in DFEs, where the output levels of the nonlinear devices are finite, in TH precoders the output levels of the modulo devices are either infinite or finite but very large. Thus, it is difficult to apply look-ahead and pre-computation techniques to speed up TH precoders, which were successfully applied to design parallel and pipelined infinite impulse response (IIR) filters and DFEs in the past. However, a TH precoder can be viewed as an IIR filter with an input equal to the sum of the original input to the TH precoder and a finite-level compensation signal. Based on this point of view, a novel parallel architecture is proposed to speed up TH precoders. This architecture can be used in many high-speed applications, such as 10-Gb Ethernet over copper.

KW - High-speed Ethernet transceiver

KW - Look-ahead

KW - P802.3an

KW - Parallel processing

KW - Pipelining

KW - Tomlinson-Harashima precoder

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U2 - 10.1109/TCSII.2007.914435

DO - 10.1109/TCSII.2007.914435

M3 - Article

AN - SCOPUS:44849121349

SN - 1549-7747

VL - 55

SP - 447

EP - 451

JO - IEEE Transactions on Circuits and Systems II: Express Briefs

JF - IEEE Transactions on Circuits and Systems II: Express Briefs

IS - 5

ER -