TY - GEN
T1 - Interference alignment at finite SNR for time-invariant channels
AU - Ordentlich, Or
AU - Erez, Uri
PY - 2011
Y1 - 2011
N2 - A time-invariant (constant channel gains) K-user interference channel is considered, where all interference (cross) channel gains are integers. For such channels, previous results demonstrate that the number of degrees of freedom is very sensitive to slight variations in the direct channel gains. In this paper we derive an achievable rate region for such channels which is valid for finite SNR. At moderate values of SNR the derived rate region is robust to slight variations in the direct channel gains. At asymptotic high SNR conditions, the known results on the degrees of freedom are recovered. The new rate region is based on lattice interference alignment. The result is established via a new coding theorem for the two-user Gaussian multiple-access channel where both users use a single linear code.
AB - A time-invariant (constant channel gains) K-user interference channel is considered, where all interference (cross) channel gains are integers. For such channels, previous results demonstrate that the number of degrees of freedom is very sensitive to slight variations in the direct channel gains. In this paper we derive an achievable rate region for such channels which is valid for finite SNR. At moderate values of SNR the derived rate region is robust to slight variations in the direct channel gains. At asymptotic high SNR conditions, the known results on the degrees of freedom are recovered. The new rate region is based on lattice interference alignment. The result is established via a new coding theorem for the two-user Gaussian multiple-access channel where both users use a single linear code.
UR - http://www.scopus.com/inward/record.url?scp=83655164953&partnerID=8YFLogxK
U2 - 10.1109/ITW.2011.6089498
DO - 10.1109/ITW.2011.6089498
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AN - SCOPUS:83655164953
SN - 9781457704376
T3 - 2011 IEEE Information Theory Workshop, ITW 2011
SP - 442
EP - 446
BT - 2011 IEEE Information Theory Workshop, ITW 2011
T2 - 2011 IEEE Information Theory Workshop, ITW 2011
Y2 - 16 October 2011 through 20 October 2011
ER -