Generalized Self-Interference Model for Full-Duplex Multicarrier Transceivers

GONZALEZ, GUSTAVO J.; GREGORIO, FERNANDO H.; COUSSEAU, JUAN; RIIHONEN, TANELI; WICHMAN, RISTO

IEEE TRANSACTIONS ON COMMUNICATIONS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2019 p. 1 - 1

0090-6778

In the modeling of full duplex (FD) transceivers using multicarrier modulations, it is usually assumed that the intercarrier (ICI) interference of the coupling path is negligible. Therefore, the system can be analyzed on a subcarrier basis, because the model reduces to a set of orthogonal flat channels. However, for a more general kind of FD transceivers, or when hardware components introduce nonlinear distortion, the orthogonality is lost and a more rigorous model is needed. In this work, we introduce a model for the coupling interference of FD systems which allows the uplink and the downlink to have different time and frequency offsets, and different parameters, such as the number of subcarriers and symbol length. Additionally, we present a linear approximation for the nonlinear coupling based on a generalization of the Bussgang?s theorem, for the case of transmitters with nonuniform power allocation. We validate the proposed model with measurements and show numerically that it improves the accuracy of the signal to interference plus noise ratio (SINR) expression, and the formulation of optimization problems. Therefore, the proposed model paves the way to more realistic performance analysis and the derivation of more accurate power allocation strategies than is possible with the classic model.