AG Kommunikationstheorie

Thema:

Cyclic Interference Alignment for the Multi-User Interference Channel with Arbitrary Message Lengths

Abstract:

In this work we consider Interference Alignment for the K-user interference channel. Interference Alignment (IA) is a concept to mitigate multi-user interference in a wireless system. The idea of IA is for the transmitters to cooperate to minimize the perceived interference at each receiver. This is achieved by overlapping interferences at a receiver in such a way that the perceived interference is independent of the number of users and can therefore be treated as a single interferer. A system model for delay-based channels using cyclic polynomials was introduced by Maier et al. in 2012. The cyclic polynomials model the integer-valued shifts by which each message of unit length is delayed during the propagation between transmitter and receiver. Using the same approach, we will extend cyclic IA for the K-user interference channel to arbitrary message lengths. Conditions on the propagation delays for cyclic IA are derived and it is shown how a cyclic IA scheme can be constructed for a given delay matrix.

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