Graduate Thesis Or Dissertation
 

Co-channel Blocker and Self-Interferer Tolerant Receiver Architectures for MIMO and Full-Duplex MIMO Receivers

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  • This research focuses on receiver architectures which enable better spectral eciency by handling blockers in the same spectral range as the signal. The presence of such blockers, without the use of blocker cancelling/ltering techniques leads to gain compression and hence, consequent performance degradation of receivers leading to reduced spectrum eciency. Two approaches have been devised, implemented in silicon and measured to demonstrate that they alleviate the problems associated with blockers. A system capable of handling co-channel spatially separated blockers is implemented in the rst work and another system capable of handling self-interference caused due to the transmitter during full-duplex operation constitutes the second work. In the rst work, a 4-channel phased array based on a novel architecture incorporating a coupler and a noise-cancelling LNA in combination with a polyphase lter was implemented to eliminate spatial co-channel blockers. This approach allows signal reception from all directions except from the direction of the blocker providing better than 20dB blocker cancellation in the X-band. The second work is aimed at achieving true simultaneous transmit-and-receive (STAR) performance through a hybrid coupler based full-duplex integrated N-path based circulator-Rx architecture. STAR radios enable higher spectrum eciency and dynamic spectrum access. Integrating the shared antenna-interface is attractive for small-form factor and MIMO channel estimation. Implemented for frequencies ranging from 550MHz to 900MHz this work addresses the challenge of low-noise wideband self-interference-cancellation by demonstrating a wide band hybrid-coupler circulator antenna interface using N-path mixers that achieves low noise gure while preserving the linearity of passive-mixer rst receiver. Better than +5.5dBm power handling of self-interference while providing over 40dB average cancellation over a bandwidth of 56MHz with a 2.7dB noise gure has been measured. Further, the full-duplex circulator architecture has been expanded to a MIMO implementation wherein we demonstrate a 65nm CMOS 2.2GHz 2x2 FD MIMO RX that achieves up to 35/45dB average self-interference-cancellation (SIC) across 40/20MHz BW with more than 42dB/53dB average cross-talk (CT)-SIC across 40/20MHz BW. Interference cancellation mechanisms cause < 2.1dB degradation in RX NF and allows an overall TX power handling of +14dBm enabled by clock bootstrapping.
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  • 2019-09-06 to 2020-10-07

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