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Parametric report of interference in Ka-band multiple-beam broadband satellite payload architectures

This paper addresses Ka-band multiple-beam satellite payloads as elements of broadband access communications systems. The characteristics of such satellites include a high degree of frequency and cell reuse, multiple-beam architectures and frequency division multiplexers that support the reuse schemes, and multiple carrier modes in which each transponder operates. The combination of these characteristics enables a highly efficient use of the bandwidth allocated to the satellite for a given coverage area. This paper shows that the cost of aggressive frequency reuse, multiplebeam architecture, and multiple carrier operation is that such systems are highly susceptible to interference. Figure 1 depicts a satellite-based access communications system. End-to-end performance of the communications system is measured by its capacity and quality of service (QoS). For the satellite transponderbased systems considered here, Eb/N0 (Energy-perinformation bit /Noise Power Spectral Density ratio) is a key parameter, because it translates to capacity and QoS. Further, Eb/N0 is directly proportional to the satellite carrier to noise plus interference ratio, C/(N + Itot), where C is the carrier power, N is the thermal noise and Itot is the sum of all interference contributions. In this paper, we present C/(N + Itot) as the critical satellite system metric for satellite-based broadband access communications systems. A typical link budget for a Ka-band multiple-beam satellite is presented, highlighting interference as the limiting parameter in C/(N+I)tot). Interference components are characterized and data is presented to describe the performance for Ka-band systems. This nominal link is used to assess the achievable performance and to analyze the impact of C/(N + Itot). Additionally, there will be some discussion of the limitations an interference-limited system imposes on carrier power adjustment to overcome rain fade. This paper concludes with comments on some emerging Ka-band satellite technologies and their projected impact on the reduction of interference in broadband access communications systems.