Ahmad Chini

10.3 An analog front-end for 100BASE-T1 automotive Ethernet in 28nm CMOS

Ethernet over a single unshielded twisted pair (UTP) copper cable coupled with power over data lines (PoDL) is gaining momentum for automotive networking, as evidenced by the recent adoption of BroadR-Reach as the IEEE802.3bw (100BASE-T1) standard and the drafting of the IEEE802.3bp (1000BASE-T1) and IEEE802.3bu (PoDL) standards [1]. BroadR-Reach has won out for its superb electromagnetic compatibility (EMC) performance - a major challenge for adapting Ethernet to automotive environments [2]. Ethernet over plastic optical fiber, as specified by IEEE802.3bv [1], appears to be an EMC solution, but a separate medium is required to deliver power to networked sensors (such as cameras). Shielded pairs are not a good choice either, due to weight/size constraints and reliability concerns about shield grounding. This paper describes an analog front-end (AFE) that tackles the EMC problems and enables a 100BASE-T1 automotive product in 28nm CMOS.

Multiple-symbol interleaved RS codes and two-pass decoding algorithm

For communication systems with heavy burst noise, an optimal Forward Error Correction (FEC) scheme is expected to have a large burst error correction capability while simultaneously owning moderate random error correction capability. This letter presents a new FEC scheme based on multiple-symbol interleaved Reed-Solomon codes and an associated two-pass decoding algorithm. It is shown that the proposed multi-symbol interleaved Reed-Solomon scheme can achieve nearly twice as much as the burst error correction capability of conventional single-symbol interleaved Reed-Solomon codes with the same code length and code rate.