IEM Seminar Series: A new type of sequences for rate adaptative coded-modulation: C4-sequences
Event details
| Date | 16.06.2023 |
| Hour | 11:00 › 12:00 |
| Speaker |
Prof. Emmanuel Boutillon Université de Bretagne Sud & Visiting Prof. @ EPFL |
| Location | |
| Category | Conferences - Seminars |
| Event Language | English |
Abstract
In this talk, we will introduce C4-sequences, a novel type of sequence that shares similar optimal autocorrelation properties with Zadoff-Chu sequences. However, C4-sequences offer the additional advantage of being also optimal for several truncation lengths, providing flexibility in adapting to different channel conditions without compromising performance. Moreover, unlike Zadoff-Chu sequences, the points of a constellation associated with a C4-sequence are not limited to the unit circle. This opens up possibilities for achieving shaping gain, leading to enhanced spectral efficiency.
The name "C4-sequences" stems for the four “C” of: "Constellation," "Circular," "Correlation," and "Cross." The "Cross" refers to the distinctive pattern exhibited by the circular autocorrelation function when represented in the complex plane.
During the talk, we will explore the construction, properties, and diverse applications of C4-sequences. These sequences are particularly well-suited for rate-adaptive coded/modulation schemes that involve messages with a small number of bits, typically ranging from 6 to 12. By combining a truncated C4-sequence modulation as an inner code with a fixed-rate non-binary outer code, highly efficient rate-adaptive communication systems can be achieved. For instance, when employing a rate 1/3 non-binary error correction code over the Galois Field GF(64) in conjunction with a Truncated C4-sequence, the proposed rate-adaptive coded-modulation system achieves performance within 0.2 dB of the Shannon limit across a wide range of signal-to-noise ratios, spanning from -15 dB up to 10 dB.
About the speaker
Emmanuel Boutillon received the Engineering Diploma in 1990 and its Ph.D.degree in 1995, both from the Telecom Paris Tech, Paris. From 1995 to 2000, he was assistant professor in Telecom Paris Tech. In 1998, he spent a sabbatical year at the University of Toronto, Ontario, Canada. In 2000, he moved to the Université Bretagne Sud (Lorient, France) as a professor. He headed the LESTER lab from 2005 up to the end of 2007. He was then head of CACS department (lab-STICC) until 2016. In 2011, he had a sabbatical year at INICTEL-UNI, Lima (Peru).His research interests are on the interactions between algorithm and architecture in the field of wireless communications and high speed signal processing. In particular, he works on Turbo Codes and LDPC decoders.
In this talk, we will introduce C4-sequences, a novel type of sequence that shares similar optimal autocorrelation properties with Zadoff-Chu sequences. However, C4-sequences offer the additional advantage of being also optimal for several truncation lengths, providing flexibility in adapting to different channel conditions without compromising performance. Moreover, unlike Zadoff-Chu sequences, the points of a constellation associated with a C4-sequence are not limited to the unit circle. This opens up possibilities for achieving shaping gain, leading to enhanced spectral efficiency.
The name "C4-sequences" stems for the four “C” of: "Constellation," "Circular," "Correlation," and "Cross." The "Cross" refers to the distinctive pattern exhibited by the circular autocorrelation function when represented in the complex plane.
During the talk, we will explore the construction, properties, and diverse applications of C4-sequences. These sequences are particularly well-suited for rate-adaptive coded/modulation schemes that involve messages with a small number of bits, typically ranging from 6 to 12. By combining a truncated C4-sequence modulation as an inner code with a fixed-rate non-binary outer code, highly efficient rate-adaptive communication systems can be achieved. For instance, when employing a rate 1/3 non-binary error correction code over the Galois Field GF(64) in conjunction with a Truncated C4-sequence, the proposed rate-adaptive coded-modulation system achieves performance within 0.2 dB of the Shannon limit across a wide range of signal-to-noise ratios, spanning from -15 dB up to 10 dB.
About the speaker
Emmanuel Boutillon received the Engineering Diploma in 1990 and its Ph.D.degree in 1995, both from the Telecom Paris Tech, Paris. From 1995 to 2000, he was assistant professor in Telecom Paris Tech. In 1998, he spent a sabbatical year at the University of Toronto, Ontario, Canada. In 2000, he moved to the Université Bretagne Sud (Lorient, France) as a professor. He headed the LESTER lab from 2005 up to the end of 2007. He was then head of CACS department (lab-STICC) until 2016. In 2011, he had a sabbatical year at INICTEL-UNI, Lima (Peru).His research interests are on the interactions between algorithm and architecture in the field of wireless communications and high speed signal processing. In particular, he works on Turbo Codes and LDPC decoders.
Practical information
- General public
- Free