Short-Packet Transmission over a Bidirectional Massive MIMO link

TL;DR

This paper analyzes short-packet transmission over bidirectional massive MIMO links, providing nonasymptotic SNR bounds and design guidelines for ultra-reliable low-latency communications with sporadic data exchange.

Contribution

It introduces a finite-blocklength analysis for bidirectional massive MIMO, offering new insights into resource allocation and channel state information acquisition for short-packet links.

Findings

Derived minimum SNR for target error probability

Provided guidelines for resource allocation in massive MIMO

Analyzed both device-initiated and base-station-initiated scenarios

Abstract

We consider the transmission of short packets over a bidirectional communication link where multiple devices, e.g., sensors and actuators, exchange small-data payloads with a base station equipped with a large antenna array. Using results from finite-blocklength information theory, we characterize the minimum SNR required to achieve a target error probability for a fixed packet length and a fixed payload size. Our nonasymptotic analysis, which applies to the scenario in which the bidirectional communication is device-initiated, and also to the more challenging case when it is base-station initiated, provides guidelines on the design of massive multiple-input multiple-output links that need to support sporadic ultra-reliable low-latency transmissions. Specifically, it allows us to determine the optimal amount of resources that need to be dedicated to the acquisition of channel state information.