Wideband N-Beam Arrays Using Low-Complexity Algorithms and Mixed-Signal Integrated Circuits

Sirani M. Perera, Viduneth Ariyarathna, Nilan Udayanga, Arjuna Madanayake, Ge Wu, Leonid Belostotski, Yingying Wang, Soumyajit Mandal, Renato J. Cintra, Theodore S. Rappaport

Research output: Contribution to journalArticlepeer-review


This paper proposes a low-complexity wideband beamforming subarray for millimeter wave (mmW) 5G wireless communications. The multibeam subarray is based on using a novel delay Vandermonde matrix (DVM) algorithm to efficiently generate analog true-time-delay beams that have no beam squint. A factorization for the DVM leading to low-complexity analog realizations is provided and complexity analysis for real and complex inputs is derived. The DVM is a special case of a Vandermonde matrix but with complex nodes that lack any special properties (unlike the discrete Fourier transform matrix). Error bounds for the DVM are established and then analyzed for numerical stability. Mixed-signal CMOS integrated circuits designs are proposed for the implementation of DVM multibeam algorithms along with low-complexity digital realizations to achieve hybrid beamforming for mmW applications. Analog-digital hybrid mmW multibeam beamforming circuits and systems are designed, for example, with eight beams at 28 GHz and simulated in cadence for functional verification.

Original languageEnglish (US)
Pages (from-to)368-382
Number of pages15
JournalIEEE Journal on Selected Topics in Signal Processing
Issue number2
StatePublished - May 2018


  • 5G multibeam arrays
  • Delay Vandermonde matrix
  • low-complexity algorithm
  • wideband beamforming

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering


Dive into the research topics of 'Wideband N-Beam Arrays Using Low-Complexity Algorithms and Mixed-Signal Integrated Circuits'. Together they form a unique fingerprint.

Cite this