MIMO Design for Internet of Things: Joint Optimization of Spectral Efficiency and Error Probability in Finite Blocklength Regime

Jinseok Choi, Jeonghun Park

Research output: Contribution to journalArticlepeer-review


In this article, we consider a multiple-input-multiple-output (MIMO) system serving Internet of Things (IoT) devices. To satisfy stringent requirements on the latency of IoT communications, the IoT devices communicate in the finite blocklength regime, wherein the achievable spectral efficiency (SE) has a backoff factor and decoding error probability is nonnegligible. Aiming to jointly optimize the sum SE and the maximum error probability, we first express the achievable SE as a function of the channel coefficients, precoders, and error probabilities. Subsequently, we formulate a problem with respect to precoders and error probabilities. A straightforward approach for the formulated problem, however, is challenging as it not only has multiple objectives but also is nonconvex. To resolve these issues, we first transform the problem as a single-objective optimization by using a weighted sum approach. Based on the reformulation, we propose an algorithm, in which error probabilities and precoders are determined by alternating two phases. Via simulations, we demonstrate that the proposed method offers significant gains compared to baseline methods, in terms of the achievable SE and the maximum error probability. In particular, we show that the communication latency is greatly reduced by using the proposed method.

Original languageEnglish
Pages (from-to)15512-15521
Number of pages10
JournalIEEE Internet of Things Journal
Issue number20
Publication statusPublished - 2021 Oct 15

Bibliographical note

Funding Information:
This work was supported in part by the National Research Foundation of Korea (NRF) grants funded by the Korea Government (MSIT) under Grant 2019R1G1A1094703 and Grant 2021R1C1C1004438, and in part by the Ministry of Science and ICT (MSIT), South Korea, through the Information Technology Research Center (ITRC) Support Program under Grant IITP-2021-2017-0-01635 supervised by the Institute for Information and Communications Technology Planning and Evaluation (IITP).

Publisher Copyright:
© 2014 IEEE.

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications


Dive into the research topics of 'MIMO Design for Internet of Things: Joint Optimization of Spectral Efficiency and Error Probability in Finite Blocklength Regime'. Together they form a unique fingerprint.

Cite this