The integration of terrestrial and satellite multibeam systems has been regarded as a potential scheme for future communication networks aiming at high-rate, wide-coverage, and low-latency services. Relying on its ubiquitous coverage, integrated terrestrial and satellite multibeam systems (ITSMSs) will play a crucial role in the forthcoming 6G to increase coverage in unserved areas and support more mobile traffic in hotspots. However, the additional multibeam transmissions in an integrated system would introduce an increase of multidimensional interference, which turns the traditional noise-limited scenario into an interference-limited case. In this article, we investigate interference mitigation technologies in ITSMS toward the future 6G wireless communication scenario, where some practical applications and potential specifics are considered. Bearing this in mind, we provide an overview on current mitigation technologies with respect to three types of interference, namely inter-beam interference, intra-beam interference, and inter-system interference. We also discuss two coordinated beamforming transmission schemes to further mitigate the aforementioned three types of interference and increase the minimal user rate. Future challenges and directions for interference mitigation in the ITSMS toward 6G are also discussed.

中文翻译：

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将地面和卫星多波束系统集成到 6G：干扰缓解的技术和挑战


地面与卫星多波束系统的融合被认为是未来通信网络以高速率、广覆盖、低时延为目标的潜在方案。凭借其无处不在的覆盖范围，集成地面和卫星多波束系统 (ITSMS) 将在即将到来的 6G 中发挥至关重要的作用，以增加无服务区域的覆盖范围并支持热点地区的更多移动流量。然而，集成系统中额外的多波束传输会引入多维干扰的增加，从而将传统的噪声限制场景转变为干扰限制情况。在本文中，我们研究了面向未来 6G 无线通信场景的 ITSMS 中的干扰缓解技术，其中考虑了一些实际应用和潜在的细节。考虑到这一点，我们概述了当前针对三种类型干扰的缓解技术，即波束间干扰、波束内干扰和系统间干扰。我们还讨论了两种协调波束成形传输方案，以进一步减轻上述三种类型的干扰并提高最小用户速率。还讨论了面向 6G 的 ITSMS 干扰缓解的未来挑战和方向。