MIDU: enabling MIMO full duplex

Given that full duplex (FD) and MIMO both employ multiple antenna resources, an important question that arises is how to make the choice between MIMO and FD? We show that optimal performance requires a combination of both to be used. Hence, we present the design and implementation of MIDU, the first MIMO full duplex system for wireless networks. MIDU employs antenna cancellation with symmetric placement of transmit and receive antennas as its primary RF cancellation technique. We show that MIDU’s design provides large amounts of self-interference cancellation with several key advantages: (i) It allows for two stages of additive antenna cancellation in tandem, to yield as high as 45 dB self-interference suppression; (ii) It can potentially eliminate the need for other forms of analog cancellation, thereby avoiding the need for variable attenuator and delays; (iii) It easily scales to MIMO systems, therefore enabling the coexistence of MIMO and full duplex. We implemented MIDU on the...

• Type: Journal
• Year: 2012
• Where: MOBICOM
• Authors: Ehsan Aryafar, Mohammad Ali Khojastepour, Karthikeyan Sundaresan, Sampath Rangarajan, Mung Chiang
• Keywords: Communications, Computer Communication Networks, Interference Cancellation, MOBICOM 2012, Variable Attenuator