An In-Band Full-Duplex Radio Receiver With a Passive Vector Modulator Downmixer for Self-Interference Cancellation

In-band full-duplex (FD) wireless, i.e., simultaneous transmission and reception at the same frequency, introduces strong self-interference (SI) that masks the signal to be received. This paper proposes a receiver in which a copy of the transmit signal is fed through a switched-resistor vector modul...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2015-12, Vol.50 (12), p.3003-3014
Main Authors: van den Broek, Dirk-Jan, Klumperink, Eric A. M., Nauta, Bram
Format: Article
Language:English
Subjects:
Antennas
Baseband
Distortion
full duplex (FD)
Interference cancellation
Mixers
Noise
Radio frequency
receiver
Receivers
self-interference (SI)
vector modulator (VM)
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Summary:In-band full-duplex (FD) wireless, i.e., simultaneous transmission and reception at the same frequency, introduces strong self-interference (SI) that masks the signal to be received. This paper proposes a receiver in which a copy of the transmit signal is fed through a switched-resistor vector modulator (VM) that provides simultaneous downmixing, phase shift, and amplitude scaling and subtracts it in the analog baseband for up to 27 dB SI-cancellation. Cancelling before active baseband amplification avoids self-blocking, and highly linear mixers keep SI-induced distortion low, for a receiver SI-to-noise-and-distortion-ratio (SINDR) of up to 71.5 dB in 16.25 MHz BW. When combined with a two-port antenna with only 20 dB isolation, the low RX distortion theoretically allows sufficient digital cancellation for over 90 dB link budget, sufficient for short-range, low-power FD links.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2015.2482495