Non-orthogonal multiple access (NOMA), an emerging technology to improve system capacity and spectrum efficiency, has attracted significant attention. In this study, the authors propose a NOMA-based downlink cooperative cellular system, where the ba
In the downlink of wideband code division multiple access (WCDMA) or WCDMA- high speed downlink packet access (HSDPA) system, the frequency reuse factor is equal to 1, which leads to more possible co-channel interference from neighbor cells. In this
This letter considers energy-efficient resource allocation for a general SISO-OFDM downlink system. A fundamental result is proven that OFDMA is optimal for achieving the maximum energy efficiency measured by bits per joule. Using the OFDMA solution
Massive multiple-input multiple-output (MIMO) is an attractive solution to achieve high data rate and tackle interference. In this paper, we study the downlink of a twocell massive MIMO system employing coordinated zero-forcing beamforming with limit
