Asynchronous LMS adaptive equalization
Signal Processing
Novel FEXT cancellation and equalization for high speed ethernet transmission
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Multirate digital filters for symbol timing synchronization in software defined radios
IEEE Journal on Selected Areas in Communications
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The interdependence among multiple channels and the interaction between timing and equalization loops bring new challenges to the design of a multi-channel symbol timing recovery (STR) system for 10GBASE-T. In addition, the nonlinear Tomlinson-Harashima precoding (THP) technique used in the 10GBASE-T system is vulnerable to the imperfect channel state information (CSI). In this paper, we address the problem of timing inaccuracy caused by imperfect CSI and the problem of extracting correct timing information in the presence of channel-interdependence and loop-interaction for 10GBASE-T. This paper proposes a novel averaged-sampling-phase (ASP) hybrid STR scheme, which aligns the sampling clock phase of a single phase-locked loop (PLL) with an average value of the timing information provided by each wire pair so that the impact of the noisy timing information resulting from the imperfect CSI and the timing jitter of the single PLL is reduced. Moreover, a three-phase timing recovery strategy based on our architecture is also designed to correctly extract the timing information and effectively mitigate the loop-interaction. Simulation results demonstrate that the proposed multi-channel STR provides a complete loop-timed solution for 10GBASE-T and achieves a superior performance over conventional approaches in terms of robustness and timing jitter.