TY - JOUR
T1 - Full-duplex bidirectional MIMO
T2 - Achievable rates under limited dynamic range
AU - Day, Brian P.
AU - Margetts, Adam R.
AU - Bliss, Daniel W.
AU - Schniter, Philip
N1 - Funding Information:
Manuscript received August 25, 2011; revised January 18, 2012; accepted March 15, 2012. Date of publication April 03, 2012; date of current version June 12, 2012. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Martin Haardt. This work was sponsored by the United States Air Force under Air Force Contract FA8721-05-C-0002. Opinions, interpretations, conclusions, and recommendations are those of the authors and are not necessarily endorsed by the United States Government.
PY - 2012/7
Y1 - 2012/7
N2 - 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.
AB - 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.
KW - Channel estimation
KW - MIMO
KW - channel models
KW - full-duplex
KW - information theory
KW - limited dynamic range
KW - wireless communication
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U2 - 10.1109/TSP.2012.2192925
DO - 10.1109/TSP.2012.2192925
M3 - Article
AN - SCOPUS:84862605173
SN - 1053-587X
VL - 60
SP - 3702
EP - 3713
JO - IEEE Transactions on Signal Processing
JF - IEEE Transactions on Signal Processing
IS - 7
M1 - 6177689
ER -