Baseband and RF hardware impairments in full-duplex wireless systems: experimental characterisation and suppression
| Autor: | Pavle Belanovic, Andrew C. M. Austin, Andreas Burg, Alexios Balatsoukas-Stimming |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
FOS: Computer and information sciences
Computer Networks and Communications business.industry Computer science Computer Science - Information Theory Information Theory (cs.IT) Transmitter Bandwidth (signal processing) Duplex (telecommunications) Signal Transceiver non-idealities Full-duplex communications Computer Science Applications Quadrature (mathematics) Signal Processing Harmonic Baseband business Digital self-interference cancellation Computer hardware |
| Zdroj: | EURASIP Journal on Wireless Communications and Networking. 2015 |
| ISSN: | 1687-1499 |
| DOI: | 10.1186/s13638-015-0350-1 |
| Popis: | Hardware imperfections can significantly reduce the performance of full-duplex wireless systems by introducing non-idealities and random effects that make it challenging to fully suppress self-interference. Previous research has mostly focused on analyzing the impact of hardware imperfections on full-duplex systems, based on simulations and theoretical models. In this paper, we follow a measurement-based approach to experimentally identify and isolate these hardware imperfections leading to residual self-interference in full-duplex nodes. Our measurements show the important role of images arising from in-phase and quadrature (IQ) imbalance in the mixers. We also observe base-band non-linearities in the digital-to-analog converters (DAC), which can introduce strong harmonic components that have not been previously considered. A corresponding general mathematical model to suppress these components of the self-interference signal arising from the hardware non-idealities is developed from the observations and measurements. Results from a 10 MHz bandwidth full-duplex OFDM system, operating at 2.48 GHz, show up to 13 dB additional suppression, relative to state-of-the-art implementations can be achieved by jointly compensating for IQ imbalance and DAC non-linearities. Comment: Submitted to EURASIP Journal on Wireless Communications and Networking (Special Issue on "Experimental Evaluation in Wireless Communications") |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink