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Coding Schemes with Rate-Limited Feedback that Improve over the Nofeedback Capacity for a Large Class of Broadcast Channels
Date: 2015/11/2             Browse: 359

Speaker: Youlong Wu ( Michele Wigger)

Time: Nov. 2th, 3:00pm – 4:00pm

Location: Room 314, Teaching Center, Zhangjiang Campus


We propose new coding schemes for the two-receiver discrete memoryless broadcast channel (BC) with rate-limited feedback from one or both receivers.

Our coding schemes improve over the nofeedback capacity region for a large class of channels, including the class of strictly essentially less-noisy BCs that we introduce in this article. Examples of strictly essentially less-noisy BCs are the binary symmetric BC (BSBC) or the binary erasure BC (BEBC) with unequal cross-over probabilities or unequal erasure probabilities at the two receivers. Also, when the feedback rates are sufficiently large,  they recover all previously known capacity results for discrete memoryless BCs with feedback. In fact, as the feedback-rates tend to infinity our scheme improves over a special case of the Shayevitz-Wigger scheme which is known to recover the mentioned results.

With appropriate modifications, both our schemes can achieve the same rates also for BCs with noisy feedback assuming that the receivers can code over the feedback links.


Youlong Wu obtained his B.S. degree in electrical engineering from Wuhan University, Wuhan, China, in 2007. He received the M.S. degree in electrical engineering from Shanghai Jiaotong University, Shanghai, China, in 2011. In 2014, he received the Ph.D. degree at Telecom ParisTech, in Paris, France. Since December 2014, he has been a postdoc at the Institute for Communication Engineering, Technische Universit?t München (TUM), Munich, Germany. His research interests include information theory and wireless communication.                                                      

SIST-Seminar 15042