DocumentCode :
2976554
Title :
Ergodic interference alignment
Author :
Nazer, Bobak ; Gastpar, Michael ; Jafar, Syed Ali ; Vishwanath, Sriram
Author_Institution :
EECS Dept., Univ. of California, Berkeley, CA, USA
fYear :
2009
fDate :
June 28 2009-July 3 2009
Firstpage :
1769
Lastpage :
1773
Abstract :
Consider a K-user interference channel with timevarying fading. At any particular time, each receiver will see a signal from most transmitters. The standard approach to such a scenario results in each transmitter-receiver pair achieving a rate proportional to 1/K the single user rate. However, given two well chosen time indices, the channel coefficients from interfering users can be made to exactly cancel. By adding up these two signals, the receiver can see an interference-free version of the desired transmission. We show that this technique allows each user to achieve at least half its interference-free ergodic capacity at any SNR. Prior work was only able to show that half the interference-free rate was achievable as the SNR tended to infinity. We examine a finite field channel model and a Gaussian channel model. In both cases, the achievable rate region has a simple description and, in the finite field case, we prove it is the ergodic capacity region.
Keywords :
Gaussian channels; fading channels; radio receivers; radiofrequency interference; Gaussian channel model; ergodic interference alignment; finite field channel model; interference-free version; timevarying fading channel; transmitter-receiver pair; user interference channel; Additive white noise; Channel capacity; Fading; Galois fields; Gaussian channels; H infinity control; Interference channels; Interference constraints; Rayleigh channels; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory, 2009. ISIT 2009. IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-4312-3
Electronic_ISBN :
978-1-4244-4313-0
Type :
conf
DOI :
10.1109/ISIT.2009.5205270
Filename :
5205270
Link To Document :
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