Adaptive Coding for Information Freshness in a Two-user Broadcast Erasure Channel

05/01/2019
by   Songtao Feng, et al.
0

In this paper, we investigate the impact of coding on the Age of Information (AoI) in a two-user broadcast symbol erasure channel with feedback. We assume each update consists of K symbols and the source is able to broadcast one symbol in each time slot. Due to random channel noise, the intended symbol at each user will be erased according to an independent and identically distributed (i.i.d.) Bernoulli process. A user is able to successfully decode an update if it accumulates sufficient information and successfully decodes the K symbols of the update. Assuming prefect feedback information at the source right after the transmission of each symbol, our objective is to design an adaptive coding scheme to achieve small AoI at both users. We propose a novel coding scheme to judiciously combine symbols from different updates together, and analyze the AoI at both users. Compared with a baseline greedy scheme, the proposed adaptive coding scheme improves the AoI at the weak user by orders of magnitude without compromising the AoI at the strong user.

READ FULL TEXT

page 1

page 2

page 3

page 4

research
04/30/2019

Age-Optimal Transmission of Rateless Codes in an Erasure Channel

In this paper, we examine a status updating system where updates generat...
research
02/01/2018

Coded Status Updates in an Energy Harvesting Erasure Channel

We consider an energy harvesting transmitter sending status updates to a...
research
10/02/2018

Timely Lossless Source Coding for Randomly Arriving Symbols

We consider a real-time streaming source coding system in which an encod...
research
04/22/2019

Benefits of Coding on Age of Information in Broadcast Networks

Age of Information (AoI) is studied in two-user broadcast networks with ...
research
05/01/2021

Three-terminal Erasure Source-Broadcast with Feedback

We study the effects of introducing a feedback channel in the erasure so...
research
05/09/2023

Minimizing Moments of AoI for Both Active and Passive Users through Second-Order Analysis

In this paper, we address the optimization problem of moments of Age of ...
research
09/01/2020

Precoding and Scheduling for AoI Minimization in MIMO Broadcast Channels

In this paper, we consider a status updating system where updates are ge...

Please sign up or login with your details

Forgot password? Click here to reset