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A 2.59-GHz RF Self-Interference Cancellation Circuit with Wide Dynamic Range for In-Band Full-Duplex Radio
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- Authors
- Seunghyeon Kim, Youngil Jeon, Gosan Noh, Youn-Ok Park, Ilgyu Kim, Hyunchol Shin
- Issue Date
- 2016-05
- Citation
- International Microwave Symposium (IMS) 2016, pp.1-4
- Language
- English
- Type
- Conference Paper
- Abstract
- A 2.59GHz self-interference cancellation (SIC) circuit is presented for in-band full-duplex radio. The SIC circuit is based on an analog vector modulator whose output can automatically track the time-varying self-interference signal through an analog LMS algorithm based weight calculation circuit. By adding a variable gain stage after the vector modulator, the total dynamic range is significantly widened so that the SIC can deal with large Tx power variation and/or Tx-to-Rx attenuation. Implemented in 16.4 × 11.9 cm2 printed circuit board, the circuit achieves the cancellation ratio of 39.2 dB and 39.4 dB for 5MHz and 10MHz bandwidth 16-QAM signal, respectively. Also, the dynamic range is increased from 22 dB to 40 dB by properly setting the variable gain.
- KSP Keywords
- 16-ary quadrature amplitude modulation(16QAM), Full-duplex radio, In-band full-duplex(IBFD), Lms algorithm, MHz bandwidth, Power variation, RF self-interference cancellation, Tx Power, Wide Dynamic Range, interference signal, printed circuit board(PCB)