Joint IRS and precoder design for OFDM-based mmWave massive MIMO systems

Kwame Ibwe ()
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Kwame Ibwe: University of Dar es Salaam

Telecommunication Systems: Modelling, Analysis, Design and Management, 2025, vol. 88, issue 4, No 8, 15 pages

Abstract: Abstract This paper investigates the joint design of hybrid precoding and intelligent reflecting surface (IRS) phase shifts for wideband millimeter-wave (mmWave) massive MIMO systems. The design problem is formulated as a spectral efficiency maximization under hardware constraints, and a hybrid precoding with IRS design (HPID) algorithm is developed. The digital precoders are updated via projected gradient ascent with power projection, while the IRS phases are optimized using alternating optimization. A theoretical upper bound based on fully digital precoding is also derived for benchmarking. Simulation results show that the proposed scheme achieves over 20% higher spectral efficiency compared to conventional hybrid baselines and attains more than 90% of the fully digital upper bound. The algorithm converges within 15–20 iterations and maintains robust performance under phase noise, suitable candidate for high-throughput and reliable 6G wideband deployments.

Keywords: IRS; OFDM; MIMO; mmWave; Precoder (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1007/s11235-025-01349-0

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