Full-Duplex MIMO Relaying: Achievable Rates Under Limited Dynamic Range

Abstract

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.

Self-interference cancellation with nonlinear distortion suppression for full-duplex systems

“…In order to understand the system limitations, several recent publications [10]- [14] have considered the problem of fullduplex transmission to investigate the impact of radio circuit impairments on the system performance and explore system bottleneck. More specifically, the results in [13] show that, due to the large power differential between the self-interference signal and the signal-of-interest, system nonlinearity becomes one of the main factors that limit self-interference mitigation capability.…”

Autocorrelation-based adaptation rule for feedback equalization in wideband full-duplex amplify-and-forward MIMO relays

“…This is in contrast with regenerative decode-andforward relays [2,11,12,13], for which the large decoding delay effectively decorrelates useful and interfering signals.…”

Optimal power allocation for a full-duplex multicarrier decode-forward relay system with or without direct link

“…A group of recent papers such as [23,24] and [25][26][27][28][29][30][31][32][33] address full-duplex relays. But none of them addresses multicarrier fullduplex decode-forward relay with direct link even though it is well known that a decode-forward relay generally yields a higher capacity than an amplify-forward relay [9] .…”