Abstract-In this paper we consider the problem of full-duplex multiple-input multiple-output (MIMO) relaying between multiantenna source and destination nodes. The principal difficulty in implementing such a system is that, due to the limited attenuation between the relay's transmit and receive antenna arrays, the relay's outgoing signal may overwhelm its limited-dynamic-range input circuitry, making it difficult-if not impossible-to recover the desired incoming signal. While explicitly modeling transmitter/receiver dynamic-range limitations and channel estimation error, we derive tight upper and lower bounds on the endto-end achievable rate of decode-and-forward-based full-duplex MIMO relay systems, and propose a transmission scheme based on maximization of the lower bound. The maximization requires us to (numerically) solve a nonconvex optimization problem, for which we detail a novel approach based on bisection search and gradient projection. To gain insights into system design tradeoffs, we also derive an analytic approximation to the achievable rate and numerically demonstrate its accuracy. We then study the behavior of the achievable 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. Index Terms-MIMO relays, full-duplex relays, limited dynamic range, channel estimation.
The transmitter/receiver dynamic-range limitations and channel estimation error at the MIMO DF relay is considered explicitly in REF , and an FD transmission scheme is proposed to maximize a lower bound of the end-to-end achievable rate by designing transmit covariance matrix.
Full-Duplex MIMO Relaying: Achievable Rates Under Limited Dynamic Range
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Computer Science