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Two-Tier Cellular System Up-link Based on Space-Frequency Block Codes and Signal Alignment

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

Two-Tier Cellular System Up-link Based on Space-Frequency Block Codes and Signal Alignment, Proc IEEE Wireless Communications and Networking Conf. - WCNC, Barcelona, Spain, Vol. , pp. - , April, 2018.

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Abstract
Accommodating the coverage and capacity requirements of wireless cellular communication systems evolved contemporary cellular architectures to comprise two tiers: A macro-cell overlay coverage tier encompassing a small-cell tier offloading user traffic in high traffic demand areas. While two-tier cellular architectures can effectively meet coverage and capacity requirements when operating on independent frequency bands, radio spectrum scarcity entails sharing spectrum by both tiers which substantially complicates interference management for such architectures. In order to address uplink interference in two-tier cellular architectures, this paper considers the joint application of dual space-frequency block codes (SFBC) and signal alignment (SA) enabled physical network coding (PNC). When compared to designs adopting interference alignment (IA) or PNC, the proposed joint dual-SFBC with SA-PNC design substantially reduces interference and enables connecting a larger number of users. Numerical results also verify that the proposed method outperforms the SA-PNC static method without any information exchange requirement between the two tiers while achieving close to optimal performance for macro-cells.