Channel Shortening Prefilter
In a wireless system with a multi-tap Channel Impulse Response (CIR) the receiver is confronted with a computationally challenging issue: Inter Symbol Interference (ISI) and Viterbi equalization. In particular as modern cellular standards tend to use ever higher modulation orders (up to 32-QAM) for Evolved EDGE, the equalizer becomes ever more complex. There exist various approaches to mitigate the induced ISI by a multi-tap CIR. The approach presented in  uses a channel shortening prefilter before equalization. Thus, ISI is mitigated to a large extent and the Viterbi equalizer's complexity is reduced. Said channel shortening prefilter has been thoroughly analyzed at the institute and a fix-point model has been built in MATLAB. In this project, the students ought to understand the channel shortening prefilter from  and implement it on an ASIC. The goal is to have an ultra-low power channel shortening prefilter.
- Looking for 1-2 Semester students
- Contact: Benjamin Weber
- VLSI I
- 20% Theory/Simulation
- 50% VHDL
- 30% ASIC Implementation
 Fredrik Rusek, Adnan Prlja. Optimal Channel Shortening for MIMO and ISI Channels. In Wireless Communications, IEEE Transactions on, vol. 11, no. 2, pages 810–818, 2012.