The Impact of Link Adaptation in Narrowband Frequency-selective Wireless Ad-hoc Networks - Part I: The Physical Perspective


Mathias Dehm, Sebastian Helmle, Michael Kuhn, Christian Körner, and Dirk Pesch


This paper together with its Part II investigates the impact of relaying and adaptive modulation and coding (AMC) on data throughput in narrowband wireless multi-hop networks. Part I focuses on the physical layer of a single carrier narrowband time division multiple access (TDMA) transmission in the very high frequency (VHF) band. The transmission chain is designed for a narrowband long range application with high order quadrature amplitude modulation (QAM) schemes in combination with low-density parity-check (LDPC) codes. The packet error rate (PER) performance is determined under a digital audio broadcast (DAB) VHF channel model. Based on the achieved PER curves for the DAB channel, the signal-to-noise ratio (SNR)-thresholds, required for an adaptive modulation and coding scheme (MCS) are proposed. These results are utilized in an overall system level simulation to investigate the impact of relaying and link adaptation in a multi-hop network which is subject of Part II of this paper.


7th Karlsruhe Workshop on Software Radios Karlsruhe, Germany, March 2012