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为使加拿大成为世界上联系最紧密的国家而提出的一项主要原则。加拿大幅员辽阔，人口密度低，北部地形恶劣，给地面宽带网络的扩张带来了经济和后勤障碍。为地面网络未提供服务或服务不足的地区提供普遍接入的唯一经济实惠的方式是通过卫星。下一代先进多频段多波束大容量GEO卫星系统的研究面临着诸多挑战，因为它是一个巨大的、多维的非线性优化问题。实际上不可能完全满足所有相关要求和限制，因为有些要求和限制明显与其他要求和限制相冲突。为了开发一种优化设计先进卫星系统的新颖、全面的方法，一名博士生将进行一项广泛的研究，以评估以下参数之间以及对整个系统的影响：卫星资源和要求（总线、发射器、功率、质量、不动产、轨道槽、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）、服务考虑因素（连接性、容量、覆盖范围、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）、干扰分量（互调、邻卫星、邻载波、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，以下三个主要研究项目将由三名硕士生进行，这些项目可能对卫星资源和链路特性产生深远影响，进而对最佳设计方法产生深远影响：i）上行链路和下行链路之间链路可用性的不对称分配，ii）链路退化的不均匀分配：热噪声与多种干扰，以及iii）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.