A Wideband IF Receiver Chip for Flexibly Scalable mmWave Subarray Combining and Interference Rejection

Rehman Akbar*, Eric A.M. Klumperink, Nuutti Tervo, Kari Stadius, Timo Rahkonen, Aarno Parssinen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
4 Downloads (Pure)

Abstract

Large-scale multibeam phased array systems suffer from interbeam interference (IBI) that should be canceled either in the analog or digital domain. In wideband systems such as fifth generation (5G), interference rejection over a wide bandwidth is challenging to achieve, not only due to nonidealities of the receiver chain but also due to the properties of the radio channel. This article presents a scalable IBI cancellation (IBIC) scheme at intermediate frequency (IF) using an IF receiver (IF-RX) chip. The IF-RX provides the flexibility of not just interference rejection between the subarrays but also wideband signal combining over multiple subarrays. It also provides wideband filtering before the analog-to-digital converter (ADC) to support 5G channel bandwidths of up to 800 MHz, high linearity, and low noise figure. A calibration method is proposed to find the cancellation coefficients for the IF-RX in measurements. Furthermore, a simplified over-the-air (OTA) IBIC model for analyzing rejection bandwidth limitations is presented. Interference rejection performance is demonstrated through the OTA measurements using 5G new radio (5G NR) signals. In the OTA measurements, 34-37-dB rejection was achieved for 50-100-MHz signals, while error vector magnitude (EVM) requirements of the 5G standards were met with good margins. Finally, the interference rejection over 4 × 100 MHz carrier aggregated 5G NR waveform was demonstrated.

Original languageEnglish
Pages (from-to) 5482 - 5497
Number of pages16
JournalIEEE transactions on microwave theory and techniques
Volume71
Issue number12
Early online date7 Jun 2023
DOIs
Publication statusPublished - Dec 2023

Keywords

  • Beamforming
  • complex multiplication
  • interbeam interference cancellation (IBIC)
  • Receivers
  • Wideband
  • 5G Mobile Communication
  • Filtering
  • Phase shifter
  • Phased array

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