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Performance of transmultiplexers based on oversampled filter banks under variable oversampling ratios

Weiss, Stephan and Millar, Andrew Paul and Stewart, Robert and Macleod, Malcolm (2010) Performance of transmultiplexers based on oversampled filter banks under variable oversampling ratios. In: 18th European Signal Processing Conference, 2010-08-23 - 2010-08-28.

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In this paper, we explore the influence of oversampling on a filter bank based transmultiplexer, for which previous research has established oversampling as a useful mean to ease synchronisation. The effect of oversampling is assessed mainly in terms of inter-symbol interference due to synchronisation errors and due to the residual time-dispersive effect of the transmission medium after transmultiplexing. Both effects can be targetted by a fractionally spaced equaliser. Although the achievable minimum mean square error is lower for higher oversampling ratios, we show by example of a powerline communications channel that slow convergence of least mean square type adaptive equalisers prohibits the exploitation of this benefit. Together with considerations on bandwidth efficiency and peak-to-average power ratio, it is advantageous to keep the oversampling ratio as small as possible.