标题： 具有 IQ 不平衡的 MIMO STAR-RIS 辅助广播信道的能量高效率分裂 显示英文标题

标题： Energy-efficient Rate Splitting for MIMO STAR-RIS-assisted Broadcast Channels with I/Q Imbalance

摘要： 本文提出了一种能量高效的多小区多输入多输出（MIMO）同时发送和反射（STAR）可重构智能表面（RIS）辅助广播信道方案，采用率分裂（RS）和非正规高斯信号（IGS）。常规RIS只能反射信号，因此只有当发射机和接收机处于RIS的反射空间时，常规RIS才能提供协助。然而，STAR-RIS可以同时发送和反射，从而提供360度覆盖。在本文中，我们假设收发器可能会受到I/Q不平衡（IQI）的影响。为了补偿IQI，我们采用了IGS。此外，我们还采用了RS来管理小区内干扰。结果显示，当RIS组件经过精心优化时，RIS可以显著提高系统的能量效率（EE）。另外，我们还显示，当常规RIS无法覆盖所有用户时，STAR-RIS可以显著优于常规RIS。我们还显示，与将干扰视为噪声相比，RS可以大幅提高EE。 显示英文摘要

摘要： This paper proposes an energy-efficient scheme for multicell multiple-input, multiple-output (MIMO) simultaneous transmit and reflect (STAR) reconfigurable intelligent surfaces (RIS)-assisted broadcast channels by employing rate splitting (RS) and improper Gaussian signaling (IGS). Regular RISs can only reflect signals. Thus, a regular RIS can assist only when the transmitter and receiver are in the reflection space of the RIS. However, a STAR-RIS can simultaneously transmit and reflect, thus providing a 360-degrees coverage. In this paper, we assume that transceivers may suffer from I/Q imbalance (IQI). To compensate for IQI, we employ IGS. Moreover, we employ RS to manage intracell interference. We show that RIS can significantly improve the energy efficiency (EE) of the system when RIS components are carefully optimized. Additionally, we show that STAR-RIS can significantly outperform a regular RIS when the regular RIS cannot cover all the users. We also show that RS can highly increase the EE comparing to treating interference as noise.