Next-Generation Multi-Band Satellite Systems

让所有加拿大人都能使用信息基础设施是政府提出的一项主要原则，目的是使加拿大成为世界上联系最紧密的国家。加拿大幅员辽阔，人口密度低，北部地形恶劣，对地面宽带网络的扩展构成了经济和后勤障碍。向地面网络没有服务或服务不足的地区提供普遍接入的唯一负担得起的手段是通过卫星。下一代先进多波段多波束大容量地球同步轨道卫星系统的研究是一个巨大的、多维的非线性优化问题，具有许多挑战性。完全满足所有有关的要求和限制实际上是不可能的，因为有些要求和限制显然是相互冲突的。为了开发一种新的、全面的方法来优化设计先进的卫星系统，一名博士生将进行广泛的研究，以评估以下参数对彼此和对整个系统的影响：卫星资源和需求（总线、发射装置、功率、质量、空间、轨道槽位、有效载荷架构、波束配置）、频段（30/20 GHz ka频段、50/40 GHz v频段和80/70 GHz w频段）、业务考虑（连性、容量、覆盖、成本）、终端特性（天线、功率放大器、上行功率控制、接入、速度、调制、编码）、干扰组件（互调、相邻卫星、相邻载波、相邻信道）、交叉极化，波束间，去极化)和性能参数（误码率，延迟，链路可用性）。同时，MASc的三名学生将进行以下三个重大研究项目，这些项目将对卫星资源和链路特性产生深远影响，进而对优化设计方法产生影响：1)上行链路和下行链路之间链路可用性的不对称分配；2)链路退化的不均匀分配：热噪声与多种干扰；3)前向链路和返回链路之间频谱的不平等分配。

Making the information infrastructure accessible to all Canadians is a major principle advanced by the government to make Canada the most connected nation in the world. Canada's vast territory, low population density, and harsh northern terrain pose economic and logistical barriers to the expansion of terrestrial broadband networks. The only affordable means of providing universal access to areas un-served or under-served by terrestrial networks is via satellites. This research on the next-generation of advanced multi-band multi-beam high-capacity GEO satellite systems presents many challenges, as it is a huge, multi-dimensional non-linear optimization problem. It is virtually impossible to fully meet all relevant requirements and constraints, for some are clearly in conflict with others. In order to develop a novel, comprehensive methodology of optimally designing advanced satellite systems, an extensive research will be carried out by a PhD student to assess the impact of the following parameters on one another and on overall system: satellite resources and requirements (buses, launchers, power, mass, real estate, orbital slots, payload architectures, beam configurations), frequency bands (30/20 GHz Ka-band, 50/40 GHz V-band, and 80/70 GHz W-band), service considerations (connectivity, capacity, coverage, cost), terminal features (antenna, power amplifier, uplink power control, access, speed, modulation, coding), interference components (inter-modulation, adjacent satellite, adjacent carrier, adjacent channel, cross-polarization, inter-beam, de-polarization), and performance parameters (bit error rate, delay, link availability). Also, in parallel, the following three major research projects, which can have profound impacts on satellite resources and link characteristics and in turn on the optimum design methodology, will be carried out by three MASc students: i) asymmetric apportioning of link availability between uplink and downlink, ii) uneven apportioning of link degradations: thermal noise versus a multitude of interferences, and iii) unequal allotments of spectrum between forward link and return link.