High-Speed Transceivers

Overview

Currently, the IEEE 802.310GBASE-T study group, known as the IEEE-P802.3an Task Force, has completed investigating the feasibility of transmission of 10 Gbps over 4 pairs of unshielded twisted pair (UTP) cables, and is developing its baseline transmission scheme. Like 1000BASE-T, 10GBASE-T achieves 10 Gbps throughput with four wire pairs and eight transceivers (four at each end) with 2.5 Gbps data rate, as shown in Fig. 1. The target bit error rate (BER) is 10-12.

Figure 1. 10GBASE-T setup
Fig. 1 also illustrates the channel conditions. From Fig. 1, we can see that the received signal at a receiver not only suffers from signal attenuation and ISI but also suffers from echo, near-end cross talk (NEXT), far-end cross talk (FEXT), and other noises such as alien NEXT (ANEXT). To meet the desired throughput and target BER requirements, we need to perform significant amount of digital signal processing operations in the transceivers, which include channel equalization, channel coding, and echo/NEXT/FEXT cancellation. Our current research interest is focused on high speed, low power and area-efficient implementation of various DSP blocks used in 10GBASE-T Transceiver which includes: 1. Parallel Decision Feedback Decoders, 2. High speed Tomlinson-Harashima precoders, 3. Interleaved trellis coded modulation and decoding, 4. Efficient long FIR Adaptive Filter Implementation, and 5. Low Power Echo&Next Cancellers

Related Papers

  • Y. Gu and K. K. Parhi, "Pipelining Tomlinson-Harashima Precoders," in Proc. of 2005 IEEE International Symposium on Circuits and Systems, pp 408-411, Kobe, Japan, May 2005
  • Y. Gu and K. K. Parhi, "Pipelined Parallel Decision Feedback Decoders(PDFDs) for High Speed Ethernet over Copper," in Proc. of the Int. Conf. On Acoustics, Speech and Signal Processing (ICASSP 2005), vol. 5, pp 121-124, Mar. 2005
  • Y. Gu and K. K. Parhi, "Parallel design for parallel decision feedback decoders for 10GBASE-T," in Proc. of 2004 47th Midwest Symposium on Circuits and Systems, vol. 2, pp 229-232, July 2004
  • Y. Gu and K. K. Parhi, "Interleaved trellis coded modulation and decoding for 10 Gigabit Ethernet over copper," in Proc. of the Int. Conf. On Acoustics, Speech and Signal Processing (ICASSP 2004), vol. 5, pp 17-21, May. 2004
  • Y. Gu and K. K. Parhi, "Interleaved trellis coded modulation and decoder optimization for 10 Gigabit Ethernet over copper", to appear in Journal of VLSI Signal Processing Systems
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