Abstract
This chapter describes several aspects of the Interference Alignment (IA) technique with a focus on the spatial domain. The basic idea of Interference Alignment consists in precoding the transmitted signals such that they are aligned at the receiver where they constitute interference, while at the same time disjointed from the desired signal. This alignment limits the generated interference to a subspace at each receiver, which in turn leaves the remaining dimensions free from any interference. Most of the literature on IA considers an idealized scenario with perfect CSI available at the transmitter. In this chapter some well known IA algorithms from the literature are described, also with simulation results for this idealized scenario. Afterwards, some insights are provided on the impact of imperfections, where CSI error and transmit antenna correlation are included within the channel model. Finally, a systemic context is considered where IA is analyzed from a system-level point-of-view, for which some insights on complexity issues are also provided
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Notes
- 1.
There are different ways to calculate the chordal distance, but only the one described in (10.36) is here considered.
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Moreira, D.C., Normando, P.G., Bandeira, C.I.R., Freitas Jr., W.C., Silva, Y.C.B. (2014). Interference Alignment, Concepts and Algorithms for Wireless Systems. In: Cavalcanti, F. (eds) Resource Allocation and MIMO for 4G and Beyond. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8057-0_10
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