Jiaheng Wang

TL;DR: 6G with additional technical requirements beyond those of 5G will enable faster and further communications to the extent that the boundary between physical and cyber worlds disappears.

TL;DR: In this article, an energy-efficient optimization problem with the resource assignment and power allocation for the orthogonal frequency division multiple access (OFDMA) based heterogeneous cloud radio access networks (H-CRANs) is formulated as a nonconvex objective function.

TL;DR: In this article, the authors investigated the optimal power allocation with given channel assignment over multiple channels under different performance criteria, namely, maximin fairness, weighted sum rate maximization, sum rate minimization with quality of service (QoS) constraints, and energy efficiency maximization with weights or QoS constraints in downlink NOMA systems.

TL;DR: This paper considers robust transmit strategies, against the imperfectness of the channel state information at the transmitter (CSIT), for multi-input multi-output (MIMO) communication systems, and finds that the optimal transmit directions are just the right singular vectors of the nominal channel under some mild conditions.

TL;DR: To mitigate the intertier interference and improve energy efficiency (EE) performances in H-CRANs, characterizing user association with RRH/HPN is considered and the traditional soft fractional frequency reuse (S-FFR) is enhanced.