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SUMMARY:Communication over many-user channels via Approximate Message Pass
 ing - Xiaoqi (Shirley) Liu\, University of Cambridge
DTSTART:20240522T130000Z
DTEND:20240522T140000Z
UID:TALK212599@talks.cam.ac.uk
CONTACT:Prof. Ramji Venkataramanan
DESCRIPTION:This talk considers communication over the Gaussian multiple-a
 ccess channel in the regime where the number of users scales linearly with
  the codelength. I will begin by discussing near-optimal coding schemes fo
 r small user payloads\, and explain why these cannot be adapted efficientl
 y to larger payloads. I will then describe a coded CDMA scheme for larger 
 payloads\, where each user's information is encoded via a linear code befo
 re being transmitted using a signature sequence. With an efficient Approxi
 mate Message Passing (AMP) decoder that can be tailored to the structure o
 f the linear code\, I show that coded CDMA schemes can achieve state-of-th
 e-art performance for payloads up to hundreds of bits\, with exact asympto
 tic performance guarantees. I will also explain how the proposed schemes c
 an be adapted to incorporate random user activity. \n\nThis is joint work 
 with Pablo Pascual Cobo\, Kuan Hsieh and Ramji Venkataramanan.\n
LOCATION:MR5\, CMS Pavilion A
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