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首页> 外文期刊>IEEE Transactions on Cognitive Communications and Networking >Resource Allocation for Cognitive Satellite Communications With Incumbent Terrestrial Networks
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Resource Allocation for Cognitive Satellite Communications With Incumbent Terrestrial Networks

机译：使用现有地面网络的认知卫星通信的资源分配

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The lack of available unlicensed spectrum together with the increasing spectrum demand by multimedia applications has resulted in a spectrum scarcity problem, which affects satellite communications (SatCom) as well as terrestrial systems. The goal of this paper is to propose resource allocation (RA) techniques, i.e., carrier, power, and bandwidth allocation, for a cognitive spectrum utilization scenario where the satellite system aims at exploiting the spectrum allocated to terrestrial networks as the incumbent users without imposing harmful interference to them. In particular, we focus on the microwave frequency bands 17.7–19.7 GHz for the cognitive satellite downlink and 27.5–29.5 GHz for the cognitive satellite uplink, although the proposed techniques can be easily extended to other bands. In the first case, assuming that the satellite terminals are equipped with multiple low block noise converters (LNB), we propose a joint beamforming and carrier allocation scheme to enable cognitive space-to-Earth communications in the shared spectrum where fixed service (FS) microwave links have priority of operation. In the second case, however, the cognitive satellite uplink should not cause harmful interference to the incumbent FS system. For the latter, we propose a joint power and carrier allocation (JPCA) strategy followed by a bandwidth allocation scheme, which guarantees protection of the terrestrial FS system while maximizing the satellite total throughput. The proposed cognitive satellite exploitation techniques are validated with numerical simulations considering realistic system parameters. It is shown that the proposed cognitive exploitation framework represents a promising approach for enhancing the throughput of conventional satellite systems.
机译：缺乏可用的未许可频谱，加上多媒体应用对频谱的需求不断增加，导致了频谱稀缺问题，这影响了卫星通信（SatCom）以及地面系统。本文的目的是针对认知频谱利用场景提出资源分配（RA）技术，即载波，功率和带宽分配，其中卫星系统旨在利用分配给作为现有用户的地面网络的频谱而不强加对他们有害的干扰。特别是，我们将注意力集中在认知卫星下行链路的17.7-19.7 GHz微波频段和认知卫星上行链路的27.5-29.5 GHz微波频段上，尽管所提出的技术可以轻松扩展到其他频段。在第一种情况下，假设卫星终端配备了多个低块噪声转换器（LNB），我们提出了一种联合波束成形和载波分配方案，以实现在固定频谱（FS）的共享频谱中进行认知空地通信微波链路具有操作优先权。然而，在第二种情况下，认知卫星上行链路不应对现有的FS系统造成有害干扰。对于后者，我们提出了联合功率和载波分配（JPCA）策略，然后提出带宽分配方案，该方案可在最大程度提高卫星总吞吐量的同时，确保对地面FS系统的保护。考虑到实际系统参数，通过数值模拟验证了提出的认知卫星开发技术。结果表明，提出的认知开发框架是提高常规卫星系统吞吐量的有前途的方法。

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