Interference alignment: frequency and time-based comparison

Interference alignment for wireless networks is a recent technique for increasing the multiplexing gain on the interference channel. It consists in forcing interfering signals at each receiver into a reduced-dimensional subspace of the received space, so that the receivers can observe an interference-free desired signal. The considered space may be an actual space (time, frequency, physical path) or structural space of the signal.

This training work will study interference alignment in time and frequency. Multiple user access will be either obtained via Time Division Multiple Access (TDMA) or Frequency Division Multiple Access (FDMA). The objective is to characterize, depending on the QoS constraints, users load and traffic load, which multi-access technique is the most efficient to fulfil users QoS constraints.

The simulations will be dynamic, accounting for the users traffic load. New access techniques for interference alignment will be determined.

Keywords:

Interference alignment, radio access, TDMA, FDMA

Requirements:

Telecommunications, Matlab and/or C languages.
Good mathematical level.

References:

• C. Suh and D. Tse, "Interference alignment for cellular networks", in Allerton Conf. Commun., Control and Computing, Sept. 2008.
• K. Gomadan, V.R. Cadambe, S.A Jafar, "Approaching the capacity of wireless network through distributed interference alignment", ArXiv, March 2008.

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