In this paper, the achievable rate of a K-user
interference channel with single antenna at individual node is
studied. Interference alignment and zero forcing are applied at
the transmitter and receiver, respectively. It is well known from
the paper  of Cadambe and Jafar that a multiplexing gain
(degrees of freedom) of K/2 is achievable. We propose two new
pre-coding methods and study how they enhance the achievable
rate in terms of the high SNR offset, while maintain the optimality
of degree of freedom the Cadambe-Jafar scheme achieved.
CitationShen, M.; Host-Madsen, A.; Vidal, J. An improved interference alignment scheme for frequency selective channels. A: IEEE International Symposium on Information Theory. "ISIT 2008". Toronto: 2008, p. 559-563.
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