Merz, Ruben ; Le Boudec, Jean-Yves

Presented at: IEEE UWBNETS, Boston, October 7th.

In: IEEE UWBNETS, 2005

Date: 2005

We consider the impact of multi-user interference on a bit-interleaved coded-modulation system with M-ary PPM (BIC M-ary PPM) in an impulse-radio ultra-wideband physical layer. In a realistic scenario such as an ad hoc network, the interference is inherently variable. This justifies the need for a physical layer that can optimally adapt its transmission parameters to the interference level. We use puncturing on the channel code so that we can not only change the modulation order but also the channel code rate. We study by simulation how the optimal combination of modulation order and channel code rate behaves with various degrees of interference. The results show that BIC M-ary PPM can be successfully adapted to various levels of interference conditions. It also shows the benefit of both rate and modulation adaptation, especially in the presence of multi-user interference.

Keyword(s): WLN, UWB, NCCR-MICS, NCCR-MICS/CL2

Reference: LCA-CONF-2005-026

Note: Invited paper