Spectrum awareness and exploitation for Cognitive Radio Satellite Communications

Abstract

Abstract-The Digital Agenda for Europe (DAE) sets forth ambitious requirements for broadband communications, in which Satellite Communications (SatCom) play a major role. In this context, spectrum sharing techniques offer unprecedented opportunities to increase capacity and reduce costs in order to allow SatCom to meet the DAE objectives. The EU FP7 Project CoRaSat is assessing Cognitive Radio (CR) techniques for Ka-band SatCom scenarios, showing that coexistence between Fixed Satellite Service (FSS) and Broadcasting Satellite System (BSS)/Fixed Service (FS) links would introduce significant benefits in non-exclusive frequency bands. In this paper, spectrum awareness and exploitation techniques are analyzed. Simulation results show that significant improvements can be obtained in both spectrum utilization (up to 2.4 GHz of additional spectrum) and available throughput (up to 600% increase).

Performance of the DBS Satellite Receiver under the Impact of Rainfall and Terrestrial Interference

“…A number of publications reported the research in the field of concurrently operating the terrestrial fixed service (FS) with satellite services (SS) (broadcasting (BSS) and fixed (FSS)), in different spectrum frequency bands [4,[7][8][9][10][11][12][13][14][15][16][17][18]. Most researches mainly study the performance of satellite receiver affected by the FS system based on spectrum sharing policies between the dissimilar systems.…”

Resource Allocation for Cognitive Satellite Communications With Incumbent Terrestrial Networks

“…In this paper, we provide a description of the techniques adopted for spectrum exploitation in two of the scenarios discussed in [12], [22]: (i) the cognitive satellite downlink in the 17.7 − 19.7 GHz band, and (ii) the cognitive satellite uplink in the 27.5 − 29.5 GHz band. These scenarios have been chosen based on market, business and technical feasibility analysis [23].…”

Mapa De Ambiente De Rádio Baseado Na Probabilidade De Detecção Para Uso Em Sistemas Cognitivos De Alta Densidade Do Serviço Fixo Por Satélite

“…onde U (f ) é a função degrau unitário definida em (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). A potência média da envoltória complexas(t) é dada por…”

“…Esta etapa provê informação sobre os níveis de interferência em cada um destes canais para estabelecer se os usuários secundários estão sujeitos a interferência prejudicial. A segunda etapa (denominada spectrum exploitation) [14], está relacionada ao aproveitamento dos canais de frequência previamente identificados como disponíveis e utiliza técnicas cognitivas para mitigar, a um nível aceitável, as interferências previamente identificadas na etapa de spectrum awareness. Esta mitigação pode ser obtida, por exemplo, utilizando-se técnicas de formação de feixe (beam-forming) [15] e de realocação dos recursos de frequência disponíveis [16].…”