University of Oulu

R. Akbar, E. A. M. Klumperink, N. Tervo, K. Stadius, T. Rahkonen and A. Pärssinen, "A Wideband IF Receiver Chip for Flexibly Scalable mmWave Subarray Combining and Interference Rejection," in IEEE Transactions on Microwave Theory and Techniques, doi: 10.1109/TMTT.2023.3279919.

A wideband IF receiver chip for flexibly scalable mmWave subarray combining and interference rejection

Saved in:
Author: Akbar, Rehman1; Klumperink, Eric A. M.2; Tervo, Nuutti1;
Organizations: 1Center for Wireless Communications–Radio Technologies, University of Oulu, Oulu, Finland
2Faculty of Electrical Engineering, Mathematics, and Computer Science, IC Design Group, University of Twente, Enschede, The Netherlands
3Department of Electronics and Nano Engineering, Aalto University, Espoo, Finland
4Faculty of Information Technology and Electrical Engineering, Circuit and System Group, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.9 MB)
Persistent link:
Language: English
Published: Institute of Electrical and Electronics Engineers, 2023
Publish Date: 2023-06-20


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 Undefined control sequence \ttimes MHz carrier aggregated 5G NR waveform was demonstrated.

see all

Series: IEEE transactions on microwave theory and techniques
ISSN: 0018-9480
ISSN-E: 1557-9670
ISSN-L: 0018-9480
DOI: 10.1109/TMTT.2023.3279919
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been supported in part by Academy of Finland Ex5GRx under Grant 2430226211 and in part by Academy of Finland, 6G Flagship program under Grant 346208.
Academy of Finland Grant Number: 346208
Detailed Information: 346208 (Academy of Finland Funding decision)
Copyright information: © Copyright 2023 IEEE - All rights reserved. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see