MLSE Post-Detection for ISI Mitigation and Synchronization in UWB Low Complexity Receivers


Florian Trösch and Armin Wittneben


IEEE Vehicular Technology Conference, VTC Spring 2007, Dublin, Ireland, Apr. 2007.

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A ultra-wideband pulse position modulation based wireless body area network with an average throughput of 1Mbps is considered. For a long battery autonomy, a low duty cycle operation of the nodes and thus, a high peak data rate is essential. Due to the moderate path loss, a peak data rate in excess of 50 Mbps is be feasible within the Federal Communications Commissionís transmit power constraints. However, with current low complexity pulse position detectors, e.g., the energy detector, the peak data rate is constrained to much lower values, because they are very sensitive to intersymbol interference. To overcome this constraint a simple post-detection maximum-likelihood sequence estimator is introduced which significantly reduces the impact of moderate intersymbol interference. Furthermore, it is shown that the very same maximum likelihood sequence estimator can be used to replace cumbersome synchronization algorithms at the expense of slight performance losses.


MLSE, UWB, Impulse Radio, Energy Detector, Low Complexity

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