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Bit-loading for modulation-adaptive transmission in infrared wireless indoor communication

: Grubor, J.; Jungnickel, V.; Langer, K.D.


Institution of Engineering and Technology -IET-:
The 2nd Institution of Engineering and Technology International Conference on Access Technologies : 21-22 June 2006, Abinton Hall, Cambridge, UK
London: IET, 2006 (IET conference publication 521)
ISBN: 0-86341-651-9
ISBN: 978-0-86341-651-4
International Conference on Access Technologies <2, 2006, Cambridge>
Conference Paper
Fraunhofer HHI ()
indoor communication; mobile radio; optical communication; optical modulation; wireless channel

In order to achieve broadband communication between a fixed access point and mobile user terminals in an indoor nondirected LOS infrared wireless system, we consider the concept of rate-adaptive transmission, based on DMT modulation of multiple orthogonal subcarriers. The previously conducted capacity analysis showed great potentials compared to statically operating links, with up to 400 Mb/s conceivable under good channel conditions. In this paper we focus on the throughput maximization in practical modulation-adaptive IR systems. We evaluate the applicability and performance of two bit-loading algorithms developed originally for DSL transmission, with the aim to determine the recommendable loading technique for the specific conditions of optical wireless channel.