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All-Digital Channelizers and Aggregators for Multi-Standard Video Distribution

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Background

Multi-standard video distribution in broadband cable networks benefits from flexible signal channelization and aggregation to handle standard-dependent subband widths (typically 6, 7, and 8 MHz), subsampling rates, and adjacent-channel attenuation requirements. In principle, this problem can be solved straightforwardly via a properly designed set of digital filters and sampling rate converters, but this solution has a very high computational complexity. It can also be (partly) solved in the analog domain but with a resulting performance degradation.

Problem statement

This thesis work amounts to investigating and developing design methods for new promising all-digital flexible solutions targeting orders-of-magnitude reductions in the computational complexity as compared with the straightforward alternative. The solutions rely on oversampled complex-modulated filter banks and are inspired by recent results in the area of flexible frequency-band reallocation networks used in satellite communication and cognitive radio.

Prerequisites

A strong background in digital signal processing and good programming skills in MATLAB.

References

[1] H. Johansson and P. Löwenborg, Flexible frequency-band reallocation network using variable oversampled complex-modulated filter banks, EURASIP J. Advances Signal Processing - Special Issue on Multirate Systems and Applications, vol. 2007, Article ID 63714, 15 pages, 2007.
[2] A. Eghbali, H. Johansson, P. Löwenborg, and H. G. Göckler, Dynamic frequency-band reallocation and allocation: From satellite-based communication systems to cognitive radios, J. Signal Processing Syst., Signal, Image, Video Technology, vol. 62, no. 2, 187-203, Feb. 2011.
[2] W. Fischer, Digital Video and Audio Broadcasting Technology, Springer, 2010.

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Last updated: 2015 02 24   15:55