Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 55, Issue 7, Pages 1909-1921Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2020.2970718
Keywords
Full duplex (FD); code domain; pseudo-noise sequence; N-path filter self-interference (SI); simultaneous transmit and receive (STAR); spread spectrum
Categories
Funding
- Defense Advanced Research Projects Agency (DARPA) Signal Processing at the RF [HR0011-17-2-0003]
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Code-domain signal processing techniques implemented at radio frequencies (RFs) enable simultaneous transmit and receive (STAR) applications. With direct sequence spread spectrum (DSSS) techniques and RF correlators, transmit (TX) self-interference (SI) is separated from the receive (RX) signal at the antenna interface for STAR. The processing gain inherent in the code-domain approach increases the TX SI rejection in the RF domain to relax filtering and linearity requirements of the RX. A code-domain RX demonstrates 52 dB of TX SI rejection with TX code-notch and RX code-pass filters operating at the same center frequency. The RX is tunable from 0.25 to 1.25 GHz and has a gain of 39 dB at 1 GHz while consuming 90 mW of which 40 mW are consumed in the front-end filters. The RX is implemented in a 45-nm CMOS SOI process and full-duplex operation is verified through an over-the-air demonstration.
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