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Current Ka-band, multi-media satellite systems employ spot beam technology to accommodate a wide range of multi-media type services. These satellites typically employ uniform allocation of RF power and bandwidth to spot beams. Since the traffic distribution tends to be highly asymmetrical and with a high degree of uncertainty, the satellite does not have sufficient flexibility to satisfy the traffic...
We propose a novel method that considerably reduces the Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems, yielding a quasi constant signal envelope in the time domain (PAPR close to 1 dB). The proposed technique, named Rotation Invariant Subcarrier Mapping (RISM), is a novel scheme for subcarriers data mapping, where the symbols belonging to the modulation...
This work presents an innovative, adaptive and optimal approach for Slotted-ALOHA protocols in Satellite Networks. Most ALOHA random access protocols are based on the assumptions that: i) all the involved stations receive packets with the same rate and ii) the transmission probabilities, computed analytically, are the same for each station. These assumptions are too optimistic, since, in real scenarios,...
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