Mohammad Amin Shokrollahi

Biography

Amin Shokrollahi has worked on a variety of topics, including coding theory, computational number theory and algebra, and computational/algebraic complexity theory. He is best known for his work on iterative decoding algorithms of graph based codes, an area in which he holds a number of granted and pending patents. He is the co-inventor of Tornado codes, and the inventor of Raptor codes. His codes have been standardized and successfully deployed in practical areas dealing with data transmission over lossy networks.

Prior to joining EPFL, Amin Shokrollahi has held positions as the chief scientist of Digital Fountain, member of the technical staff at Bell Laboratories, senior researcher at the International Computer Science Insitute in Berkeley, and assistant professor at the department of computer science of the university of Bonn. He is a Fellow of the IEEE, and he was awarded the Best Paper Award of the IEEE IT Society in 2002 for his work on iterative decoding of LDPC code, the IEEE Eric Sumner Award in 2007 for the development of Fountain Codes, and the joint Communication Society/Information Theory Society best paper award of 2007 for his paper on Raptor Codes.

Official source

https://people.epfl.ch/amin.shokrollahi

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In mathematics and computer science, an algorithm (ˈælɡərɪðəm) is a finite sequence of rigorous instructions, typically used to solve a class of specific problems or to perform a computation. Algo

In communications and information processing, code is a system of rules to convert information—such as a letter, word, sound, image, or gesture—into another form, sometimes shortened or secret, for c

A number is a mathematical object used to count, measure, and label. The original examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers can be represented in language with number words.

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10.1 A pin-efficient 20.83Gb/s/wire 0.94pJ/bit forwarded clock CNRZ-5-coded SerDes up to 12mm for MCM packages in 28nm CMOS

Klaas Lammert Hofstra, Ali Hormati, Sergio Pesenti, Mohammad Amin Shokrollahi, Anant Pratap Singh, Seyed Armin Tajalli, Omid Talebi Amiri, Christoph Walter

High-speed signaling over package substrates is key to delivering the promise of 2.5D integration. Applications abound and include high-density memory interfaces, sub-division of large dies to increase yield and lower development time, sub-division of a die to achieve upward or downward scalability, or connecting to an off-chip SerDes or optics engine. Each of these in-package applications typically has high throughput and onerously low power constraints along with a low-loss channel. Several solutions have been proposed. Interposer substrates [1], or Chip-on-Substrate-on-Wafer [2] allow for very high-density wiring and low power using CMOS transceivers. Their high manufacturing and testing cost makes them prohibitive for anything but high-end applications. A different approach using high-speed ground-referenced single-ended signaling is reported in [3], which is intended for shorter channels up to 4.5mm and a BER of 1e-12. An approach using differential signaling on up to 0.75" of Megtron 6 material and a BER of 1e-9 is reported in [4]. A comparison is given in Fig. 10.1.1.

2016

A Versatile Spectrum Shaping Scheme for Communicating Beyond Notches in Multi-Drop Interfaces”

Kiarash Gharibdoust, Ali Hormati, Mohammad Amin Shokrollahi, Seyed Armin Tajalli, Christoph Walter

This paper proposes a signal shaping technique to increase the data rate of high-speed SerDes communication systems over multi-drop bus interfaces. This scenario creates a channel with deep notches in its spectrum, and therefore the effective data rate in conventional systems is directly affected by the frequency of the notch. Our method uses a special temporal coding scheme such that the input data stream has a notch at the same frequency as the notch in the channel. In this way, channel notch does not fully deteriorate the incoming data sequence and therefore the receiver can successfully decode the transmitted data stream. Using this approach, the communication rate over a channel with notch located at fnotch can be increased from fb < 2 fnotch (conventional NRZ), to fb = M fnotch (M >= 2).

2016

Bus reversable orthogonal differential vector signaling codes

Mohammad Amin Shokrollahi

Properties and the construction method of Orthogonal Differential Vector Signaling Codes are disclosed which are tolerant of order-reversal, as may occur when physical routing of communications channel wires causes the bus signal order to be reversed. Operation using the described codes with such bus-reversed signals can avoid complete logical or physical re-ordering of received signals or other significant duplication of receiver resources.

2016