A 32-Gb/s Simultaneous Bidirectional Source-Synchronous Transceiver With Adaptive Echo Cancellation Techniques

Fan, Yang-Hang; Kumar, Ankur; Iwai, Takayuki; Roshan-Zamir, Ashkan; Cai, Shengchang; Sun, Bo; Palermo, Samuel

doi:10.1109/jssc.2019.2956369

“…Conventionally, to suppress the SI, the SBD links with low operating baud-rates use hybrids with passive components such as T-coils or magnetic bridges [42]- [44]. In contrast, hybrids for high baud-rate links use active components [7], [23]- [35]. These hybrids need tuning or calibration to matched delays and frequency responses of the main signal path P m and the interference cancellation path P c , as shown in Fig.…”

Section: Si and Echo Cancellation In Conventional Sbd Linksmentioning

confidence: 99%

A 100 Gbps True Full-Duplex Link with Interference Cancellation in the Background

Goyal¹,

Gupta²

2021

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In this work, we introduce the concept of true full-duplexing (TFD) for high-speed interconnects. Full-duplex transceivers at the two ends of an interconnect can support simultaneous bidirectional data transfer. Full-duplexing can help in increasing the throughput per lane and also enable higher data transfer bandwidths without an increase in the routing density. The proposed TFD approach allows for the use of independent modulation schemes as well as independent baud-rates by the transceivers on either side of the interconnect. The approach also obviates the requirement of a dedicated start-up protocol or a training sequence for cancellation of near-end interference in the TFD transceivers. In this work, we have used a correlation-based cancellation technique which can support background cancellation of the interference. Here, we demonstrate a 100 Gbps TFD link over a 1 m long coaxial cable with off-the-shelf components, which is the first demonstration of a full-duplex communication link at such a high data rate.

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“…(iii) Minimize the NE interference present in the S RI [n] using an adaptive digital SI and echo canceller (SEC) to obtain S RIC [n]. To recover the FE information, most digital cancellers used for minimizing the SSI and echoes, apart from initialization also need synchronization between Transceiver-NE and Transceiver-FE [7], [23]- [35]. Here, we propose the use of TFD in high-speed links as well as in high-density interconnects, where these requirements for minimization are obviated by the use of a correlation-based SEC.…”

Section: Si and Echo Cancellation In Conventional Sbd Linksmentioning

confidence: 99%

“…The engines are used for suppressing the time-dependent variations in the amplitude, baud-rate, and pulse shape of the NE transmitted signal. The digital cancellers need synchronization or clock forwarding between the two transceivers in a masterslave configuration [35]. The dependence of these cancellation approaches on the FE transceiver makes calibrating the hybrid and training the canceller challenging, especially when the FE transmitter is active.…”

Section: Introductionmentioning

confidence: 99%

A 100 Gbps True Full-Duplex Link with Interference Cancellation in the Background

Goyal¹,

Gupta²

2021

Preprint

0

View full text Add to dashboard Cite

In this work, we introduce the concept of true full-duplexing (TFD) for high-speed interconnects. Full-duplex transceivers at the two ends of an interconnect can support simultaneous bidirectional data transfer. Full-duplexing can help in increasing the throughput per lane and also enable higher data transfer bandwidths without an increase in the routing density. The proposed TFD approach allows for the use of independent modulation schemes as well as independent baud-rates by the transceivers on either side of the interconnect. The approach also obviates the requirement of a dedicated start-up protocol or a training sequence for cancellation of near-end interference in the TFD transceivers. In this work, we have used a correlation-based cancellation technique which can support background cancellation of the interference. Here, we demonstrate a 100 Gbps TFD link over a 1 m long coaxial cable with off-the-shelf components, which is the first demonstration of a full-duplex communication link at such a high data rate.

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“…These hybrids may also require manual tuning or foreground calibration to support data transfer over a wide range of interface conditions. Furthermore, most of these techniques require timing synchronization between the far-end and the near-end signals, to ensure that the interference is suppressed/cancelled sufficiently, as the amount of cancellation depends on the receiver sampling phase [19], [20], [30], [31]. To overcome the above mentioned limitations, digital techniques have to be implemented, which can support interference cancellation adaptively [18].…”

Section: Introductionmentioning

confidence: 99%

A True Full-Duplex IO (TFD-IO) with Background SI Cancellation for High-Density Interfaces

Goyal¹,

Parulekar²,

Gupta³

2021

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0

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In this work, we have proposed and experimentally demonstrated a true full-duplex IO (TFD-IO) for high-speed high-density interfaces. The proposed TFD-IO can be used as an independent module that converts a unidirectional IO/interconnect to a fully bidirectional IO/interconnect, to ideally double the throughput of the high-speed interface. <br>The TFD-IO uses a correlation-based technique to cancel the self-interference (SI) adaptively in the background. The signals transmitted from the near-end and the far-end can use independent baud-rates and signaling schemes in a TFD-IO. A proof-of-concept design of the TFD-IO module has been fabricated in a 65 nm CMOS technology, and demonstrated with bidirectional throughputs of up to 12.8\,Gb/s.

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A 32-Gb/s Simultaneous Bidirectional Source-Synchronous Transceiver With Adaptive Echo Cancellation Techniques

Cited by 21 publications

References 18 publications

A 100 Gbps True Full-Duplex Link with Interference Cancellation in the Background

A 100 Gbps True Full-Duplex Link with Interference Cancellation in the Background

A 100 Gbps True Full-Duplex Link with Interference Cancellation in the Background

A True Full-Duplex IO (TFD-IO) with Background SI Cancellation for High-Density Interfaces

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