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Since their dawning, space communications have been among the strongest driving applications for the development of error correcting codes. Indeed, space-to-Earth telemetry (TM) links have extensively exploited advanced coding schemes, from convolutional codes to Reed-Solomon codes (also in concatenated form) and, more recently, from turbo codes to low-density parity-check (LDPC) codes. The efficiency...
NEXCODE is a project promoted by the European Space Agency aimed at research design development and demonstration of a receiver chain for telecomm and links in space missions including the presence of new short low-density parity-check codes for error correction. These codes have excellent performance from the error rate viewpoint but also put new challenges as regards synchronization issues and implementation...
The work presented in this paper aims at illustrating the improvements foreseen for the Payload Data Transmitter of Near Earth and Deep Space scientific missions. Taking advantage of technology evolution combined with innovative architectures and advanced digital signal processing, the paper shows how to increase dramatically the data return in severely power-constrained scenarios, typical of Deep...
In this study the use of Ramanujan transform (RT) for the assessment of T-Wave alternans (TWA) is investigated. The RT projects a signal on particular basis functions constituted by Ramanujan sums (RS). The resulting components highlight the presence of 1/q resonances, being q an integer number. Thus, the transform is suitable for detecting the typical 1/2 pattern of TWA. After alignment, the successive...
In this paper, the transmission of VoIP over WCDMA is considered, focusing on the enhanced uplink HSUPA. The main limitation to system capacity in such a scenario is the constant presence of an uplink control channel. A technical solution to overcome such a problem is presented and assessed by means of link simulations.
In this paper, link performance aspects of the high speed uplink packet access (HSUPA), evolution of the WCDMA/UTRA-FDD standard, are investigated. The main focus is on the impact of the transmit time interval (TTI) on the overall system performance. Different aspects should be taken into account when choosing the TTI to be used. The simulation results presented here could give system designers a...
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