Low-Complexity Control of an Electrical-Balance Duplexer

European Microwave Conference (EuMC), pp. 158–161

Abstract

In-band full-duplexing (IBFD) ideally halves the spectral demand of a wireless communication node. A cost-efficient implementation is offered by the electrical-balance duplexer (EBD) architecture, where a tunable impedance is used to ensure Tx to Rx isolation in a hybrid coupler. Conventionally, however, the control of the balancing impedance requires a complex setup, including a controller with high computing power and reflection coefficient measurements. In this paper, an EBD architecture whose control is based on power detector measurements and which runs on a microcontroller with low computing power is proposed. Measured Tx-Rx isolation is demonstrated to be above 52 dB over a broad bandwidth from 2.1 GHz to 2.6 GHz. IBFD operation is emulated in the laboratory, demonstrating the capabilities of the proposed system.

Authors 4

1. Jonas Winkelhake Aachen Chair of High Frequency Electronics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,Chair of High Frequency Electronics,Germany

   Chair of High Frequency Electronics, RWTH Aachen University, Germany

2. Lukas Hüssen Aachen Chair of High Frequency Electronics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,Chair of High Frequency Electronics,Germany

   Chair of High Frequency Electronics, RWTH Aachen University, Germany

3. Muh‐Dey Wei Aachen Chair of High Frequency Electronics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,Chair of High Frequency Electronics,Germany

   Chair of High Frequency Electronics, RWTH Aachen University, Germany

4. Renato Negra Aachen Chair of High Frequency Electronics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,Chair of High Frequency Electronics,Germany

   Chair of High Frequency Electronics, RWTH Aachen University, Germany