Interference Alignment

Interference Channel Model (A)symmetric interference levels

A typical wireless communication scenario is described by pair-wisely communicating transmitters and receivers. Therein, the impact of interference is the key impairment when dealing with multiple users. It has been a long-standing open problem in communications theory to compute the maximal achievable rates of such a multi-user interference channel.

Recent progress in the research area of communications and information theory provided intriguing insights into the opportunities hidden inside a K-user interference channel. The key idea is to cooperatively align the transmitted signals, such that the aggregated interference signal of multiple transmitters exactly overlaps within a minimized signal space of each receiver. Then, the receiver perceives the interference as if it originates from a single interferer only. This is a very useful property that yields extraordinary data rates which are independent of the number of users within the channel. A conceptional example is depicted for K=3 pairs in the left figure above.

Our main focus is on theoretical modelling and the derivation of capacity-achieving schemes for:

Related research topics and publications

Cyclic interference alignment and interference alignment by propagation delay

Interference alignment and multi-way communications

Related projects

Related student work


For further Information please contact Henning Maier.