Power Control for Satellite Uplink and Terrestrial Fixed-Service Co-Existence in Ka-Band

Abstract

Abstract-A fundamental problem facing the next generation of Satellite Communications (SatComs) is the spectrum congestion and how the scarce spectral resources are allocated to meet the demand for higher rate and reliable broadband communications. In this context, this paper addresses the satellite uplink where satellite terminals reuse frequency bands of FixedService (FS) terrestrial microwave links which are the incumbent users in the Ka band. In this scenario, the transmit power of the satellite terminals has to be controlled such that the aggregated interference caused at the FS system is kept below some acceptable threshold. In this paper, we review simple and efficient power allocation techniques available in the literature and, with slight adaptations, we evaluate them to the proposed satellite uplink and terrestrial FS co-existence scenario. The presented numerical results highlight the tradeoff between the level of channel state information and the rates that can be achieved at the satellite network.

Power and rate allocation in cognitive satellite uplink networks

“…In both Figures 3(c) and 3(d), we observe the technique presented in [10] perfectly matches with the solution of the maximization of the sum-powers, which goes in line with the conclusion in [17]. However, this is not the optimal in terms of sum-rate neither in terms of fairness.…”

“…Figures 3(c) and 3(d) show the results of the proposed techniques and compare the result with the gradient-based power control proposed in [10], [17] with α k = 0.1, ∀k, and 200 iterations. For comparison, we solved and plotted the result of max p K k=1 w k p k , subject to p ∈ Ω, which corresponds to the maximization of the sum-power optimization.…”

“…Very few works have investigated the cognitive satellite uplink scenario [7]- [10]. The applicability of CR in the aforementioned scenario was discussed in [7], concluding that both satellite and terrestrial systems could potentially operate in the same band without degrading each others' performance.…”

“…In our previous work [9], we took this into account and proposed a sub-optimal joint power and carrier allocation technique for the cognitive satellite uplink and terrestrial FS co-existence scenario. The technique presented in [9] was compared to different transmit power allocation strategies in [10], depending on the amount of side information available at each satellite terminal.…”

Joint Transmit Power and Bandwidth Allocation for Cognitive Satellite Network Based on Bargaining Game Theory

“…Shi et al [21] investigated the power control problem for cognitive satellite networks with real-time service. In [22], some representative methods for power control in satellite networks were reviewed, and these methods were evaluate to the cognitive satellite networks. In [23], a power allocation solution was give to maximize the achievable rate of the cognitive satellite network.…”