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Free Space Optics (FSO) links provide usage of high bandwidth and the flexibility of wireless communication links. However, weather patterns like fog and heavy snow fall limit the availability of FSO. Another technology providing similar properties regarding offered data rates and flexibility of set up is Millimeter Wave Technology (mmW), operating at several tens of GHz. In this case, heavy rain...
The most expensive costs in satellite communication are incurred by the space segment. Therefore, effort should be focused on the efficient use of this resource. One aspect is the optimization of the physical layer, to approach the Shannon limit of channel capacity. In IP-based networks, communication between arbitrary terminals can be established, which must hold for IP-based satellite networks as...
A two-stage algorithm for blind symbol rate estimation is introduced, which applies to any linear modulation scheme. In the first stage, the inverse Fourier transform of the averaged power spectrum is used to extract a coarse estimate based on the evaluation of the related baseband shape. The accuracy of the result can be improved considerably if the accumulated timing error of the subsequent symbol...
Within the framework of an ESA project, a multi-frequency TDMA modem for IP-optimized communications over satellite has been designed. In order to be fully open and flexible for future extensions with respect to different data rates, modulation schemes, baseband shapes and synchronization algorithms, the modem is implemented on an FPGA-PCI platform. In this context, a preambleless solution for initial...
Due to the exponential growth of the Internet, the protocol suite of the Internet has become dominant. In the past, satellite communications systems used proprietary protocols. More recently, satellite multimedia architectures have been based on ATM as well as MPEG transport and multiplexing mechanisms. When the traffic is however mostly IP, then the transmission overhead will be significant in both...
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