We consider a cell-free massive multiple-input multiple-output (MIMO) network utilizing a virtually full-duplex (vFD) mode, where access points (APs) with a downlink (DL) mode and those with an uplink (UL) mode simultaneously serve DL and UL users (UEs). In order to maximize the sum spectral efficiency (SE) of the DL and UL transmissions, we formulate a mixed-integer optimization problem to jointly design the AP mode assignment and power control. This problem is subject to minimum per-UE SE requirements, per-AP power control, and per-UL UE power constraints. By employing the successive convex approximation technique, we propose an algorithm to obtain a stationary solution of the formulated problem. Numerical results show that the proposed vFD approach can provide a sum SE that is $2.5$ and $1.5$ times larger than the traditional half-duplex and heuristic baseline schemes, respectively, in terms of $95\%$-likely sum SE.

翻译：我们考虑的是无细胞的大规模多输出多输出输出网络(MIMO),它使用几乎完全的多元(vFD)模式,使用下链(DL)模式的接入点和上链(UL)模式的接入点同时为DL和UL用户服务。为了最大限度地提高DL和UL传输的光谱效率,我们提出了一个混合整数优化问题,以联合设计AP模式分配和电源控制。这个问题受每UE SE最低要求、每AP电源控制和每UL UE电源限制的限制。我们通过使用连续的螺旋近距离技术,提出了一种算法,以固定地解决问题。数字结果显示,拟议的 vFD方法可以提供比传统的半重复和超常基线计划分别大2.5美元和1.5美元的SE金额,即95 元或似的SE。