Analysis and Design of a Full-Duplex Two-Element MIMO Circulator-Receiver With High TX Power Handling Exploiting MIMO RF and Shared-Delay Baseband Self-Interference Cancellation

In this article, we present how full-duplex (FD) operation can be integrated with multi-input multi-output (MIMO) operation using RF and baseband (BB) self-interference cancellation (SIC). MIMO operation increases the SIC requirements by a factor of N 2 , resulting in severe area, power consumption,...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2019-12, Vol.54 (12), p.3525-3540
Main Authors: Baraani Dastjerdi, Mahmood, Jain, Sanket, Reiskarimian, Negar, Natarajan, Arun, Krishnaswamy, Harish
Format: Article
Language:English
Subjects:
Antennas
Broadband
Cancellation
Cancellers
Circulator (circ.)
Circulators
CMOS
Crosstalk
Degradation
Delay
Delays
Design analysis
full-duplex (FD) wireless
Handling
Interference
interference cancellation
MIMO communication
multi-input multi-output (MIMO)
Noise measurement
Power consumption
Radio frequency
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Summary:In this article, we present how full-duplex (FD) operation can be integrated with multi-input multi-output (MIMO) operation using RF and baseband (BB) self-interference cancellation (SIC). MIMO operation increases the SIC requirements by a factor of N 2 , resulting in severe area, power consumption, and noise penalty. We present the detailed analysis, design, and implementation of RF/BB cancellers that address this challenge, as well as a bootstrapping technique to enhance the power handling of integrated circulator-receivers (circ.-RX). A 65-nm CMOS scalable two-element MIMO FD circ.-RX array with integrated N-path-filter-based nonmagnetic circulators is described that: 1) exploits bootstrapping in the circulator N-path filters to enhance Transmitter (TX) power handling by 8 dB and 2) features areaand power-efficient passive RF and active BB wideband MIMO cancellation with shareddelay elements to address the O(N 2 ) cancellation challenge. The prototype exhibits: 1) up to 35-/45-dB average SIC across 40-/20-MHz BW; 2) more than 42-/53-dB average crosstalk (CT)SIC across 40-/20-MHz BW with
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2019.2945303