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We study Tomlinson-Harashima precoding (THP) for the broadcast scenario, i.e., transmission from a central base station to a number of scattered, non-cooperating mobile stations. In the linear description of THP, given the data symbol, a suited signal representation is selected from an effective signal constellation. In this paper, we assess how to choose the effective signal constellation. It is...
Power efficiency of noncoherent receivers for impulse-radio ultra-wideband (IR-UWB) transmission systems can significantly be improved, on the one hand, by employing multiple-symbol differential detection (MSDD), and, on the other hand, by providing reliability information to the subsequent channel decoder. In this paper, we combine these two techniques. Incorporating the computation of the soft information...
With the aim of reducing its search complexity, we study a stopping radius for the sphere decoder (SD) algorithm. We compare two variants in setting this stopping radius. In particular, we consider a stopping radius, based on a lower bound on the packing radius, which preserves the optimality of the SD output, and a stopping radius which is based on the statistics of the underlying search problem...
Multiple-symbol differential detection (MSDD) is a powerful technique for power-efficient low-complexity autocorrelation receivers in ultra-wideband impulse-radio (UWBIR) systems. Since MSDD can be represented as a tree search problem, it is efficiently implemented by the Sphere Decoder (SD) algorithm. In this paper, we introduce a novel stopping criterion for the SD, which is based on a lower bound...
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