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Joint Space-Frequency Block Codes and Signal Alignment for Heterogeneous Networks

Ali, S. Ali ; Castanheira, D. ; Alsohaily, A. ; Sousa, E. ; Silva, A. ; Gameiro, A.

IEEE Access Vol. 5, Nº NA, pp. 71099 - 71109, November, 2018.

ISSN (print): 2169-3536
ISSN (online): 2169-3536

Journal Impact Factor: 1,270 (in 2015)

Digital Object Identifier: 10.1109/ACCESS.2018.2881338

Abstract
In this paper, we propose a new diversity-oriented space-frequency block codes (SFBC) and signal alignment (SA) enabled physical network coding (PNC) method for the uplink of heterogeneous networks. The proposed joint Dual-SFBC with SA-PNC design substantially reduces interference and enables connecting a larger number of users when compared to methods adopting interference alignment (IA) or PNC. The main motivation behind the dual SFBC and SA-PNC design is that it allows the efficient coexistence of macro and small cells without any inter-system channel information requirements. Numerical results also verify that the proposed method outperforms the existing SA-PNC static method without any additional information exchange requirement between the two systems while achieving the main benefits of IA and SA-PNC coordinated methods recently proposed.