Conference Paper

# Beamforming for Space Division Duplexing

Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada

DOI: 10.1109/icc.2011.5962761 Conference: Communications (ICC), 2011 IEEE International Conference on Source: IEEE Xplore

- [Show abstract] [Hide abstract]

**ABSTRACT:**In-band full-duplex (IBFD) operation has emerged as an attractive solution for increasing the throughput of wireless communication systems and networks. With IBFD, a wireless terminal is allowed to transmit and receive simultaneously in the same frequency band. This tutorial paper reviews the main concepts about in-band full-duplex wireless .A key challenge behind IBFD operation is mitigation of self-interference, i.e., the interference caused by an IBFD node's own transmissions to its desired receptions. A wide array of techniques proposed in the literature for IBFD self-interference suppression are surveyed in this tutorial. Also discussed are numerous research challenges and opportunities in the design and analysis of IBFD wireless systems11/2013; - [Show abstract] [Hide abstract]

**ABSTRACT:**In this paper, we consider the problem of full-duplex bidirectional communication between a pair of modems, each with multiple transmit and receive antennas. The principal difficulty in implementing such a system is that, due to the close proximity of each modem's transmit antennas to its receive antennas, each modem's outgoing signal can exceed the dynamic range of its input circuitry, making it difficult-if not impossible-to recover the desired incoming signal. To address these challenges, we consider systems that use pilot-aided channel estimates to perform transmit beamforming, receive beamforming, and interference cancellation. Modeling transmitter/receiver dynamic-range limitations explicitly, we derive tight upper and lower bounds on the achievable sum-rate, and propose a transmission scheme based on maximization of the lower bound, which requires us to (numerically) solve a nonconvex optimization problem. In addition, we derive an analytic approximation to the achievable sum-rate, and show, numerically, that it is quite accurate. We then study the behavior of the sum-rate as a function of signal-to-noise ratio, interference-to-noise ratio, transmitter/receiver dynamic range, number of antennas, and training length, using optimized half-duplex signaling as a baseline.IEEE Transactions on Signal Processing 01/2012; 60(7):3702-3713. · 2.81 Impact Factor -
##### Conference Paper: Large-system analysis of rate regions in bidirectional full-duplex MIMO link: Suppression versus cancellation

[Show abstract] [Hide abstract]

**ABSTRACT:**We analyze the performance of bidirectional communication links between two multi-antenna full-duplex transceivers, explicitly taking into account the effect of unavoidable self-interference. The main theme of this paper is to compare spatial-domain suppression (implemented in the form of null-space projection) and subtractive time-domain cancellation: both schemes can eliminate the self-interference but the former consumes spatial degrees of freedom unlike the latter. We perform large-system analysis based on the replica method, while reference simulations show that the asymptotic results are applicable also for practical systems with low number of antennas. In particular, we evaluate rate regions achieved by controlling the spatial multiplexing order in each node and time sharing between different stream configurations. Consequently, we can characterize the rate loss of suppression versus cancellation.Information Sciences and Systems (CISS), 2013 47th Annual Conference on; 01/2013

Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.