Precoding and Scheduling for AoI Minimization in MIMO Broadcast Channels

09/01/2020
by   Songtao Feng, et al.
0

In this paper, we consider a status updating system where updates are generated at a constant rate at K sources and sent to the corresponding recipients through a broadcast channel. We assume that perfect channel state information (CSI) is available at the transmitter before each transmission, and the additive noise is negligible at the receivers. While the transmitter is able to utilize the CSI information to precode the updates, our object is to design optimal precoding schemes to minimize the summed average age of information (AoI) at the recipients. Under various assumptions on the size of each update and the number of antennas at the transmitter and the receivers, this paper identifies the corresponding age-optimal precoding and transmission scheduling strategies. Specifically, for the case where each user has one receiving antenna, a round-robin based updating scheme is shown to be optimal. For the two-user case where the number of antennas at each receiver is greater than the size of updates, a framed alternating updating scheme is proven to be optimal.

READ FULL TEXT

Authors

page 1

page 2

page 3

page 4

12/05/2020

Age Minimization Transmission Scheduling over Time-Correlated Fading Channel under An Average Energy Constraint

In this paper, we consider transmission scheduling in a status update sy...
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...
11/02/2020

On Sum Secure Degrees of Freedom for K-User MISO Broadcast Channel With Alternating CSIT

In this paper, the sum secure degrees of freedom (SDoF) of the K-user Mu...
01/15/2018

Sending Information Through Status Updates

We consider an energy harvesting transmitter sending status updates rega...
01/29/2020

Partial Updates: Losing Information for Freshness

We consider an information updating system where a source produces updat...
05/01/2019

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

In this paper, we investigate the impact of coding on the Age of Informa...
01/21/2019

Achieving Vanishing Rate Loss in Decentralized Network MIMO

In this paper, we analyze a Network MIMO channel with 2 Transmitters (TX...
This week in AI

Get the week's most popular data science and artificial intelligence research sent straight to your inbox every Saturday.