Tutorial on Channel Equalization for Mobile Channels

Equalizer design for multi-path channels is closely linked to the distribution of zeros of mobile channels. While in a deterministic scenario, equalizers can be designed based on knowledge of the exact locations of zeros in the complex plane, mobile channels like in GSM/EDGE systems ask for a different approach. Various channel distortions make the derivation of a deterministic model a hard if not infeasible task. However, one can show that a statistical channel description can help in the development of suitable equalizers. We summarize some of the results obtained in [Schober01] on the importance of the distribution of zeros of the channel and finally explain some equalization respectively prefiltering strategies to overcome the burden of inter-symbol interference. Based on given power delay profiles, one can choose proper equalizer concepts for improving overall transmission performance.