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Energy-efficient 5G outdoor-to-indoor communication: SUDAS over licensed and unlicensed spectrum

: Ng, Derrick Wing Kwan; Breiling, Marco; Rohde, Christian; Burkhardt, Frank; Schober, Robert


IEEE Transactions on Wireless Communications 15 (2016), Nr.5, S.3170-3186
ISSN: 1536-1276
Fraunhofer IIS ()

In this paper, we study the design of the user selection, the time allocation to uplink and downlink, and the transceiver processing matrix for uplink and downlink multicarrier transmission employing a shared user equipment (UE)-side distributed antenna system (SUDAS). The proposed SUDAS simultaneously utilizes licensed frequency bands and unlicensed frequency bands with large available bandwidths (e.g. the millimeter wave bands) to enable a spatial multiplexing gain for single-antenna UEs to improve the energy efficiency and throughput of 5th generation (5G) outdoor-to-indoor communication. The resource allocation algorithm design is formulated as a nonconvex optimization problem for the maximization of the end-to-end system energy efficiency (bits/Joule). The nonconvex matrix optimization problem is converted to an equivalent nonconvex scalar optimization problem for multiple parallel channels, which is solved by an asymptotically globally optimal iterative algorithm.