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|Abstract:||The K -user cyclic Z-interference channel models a situation in which the k th transmitter causes interference only to the ( k -1)th receiver in a cyclic manner, e.g., the first transmitter causes interference only to the K th receiver. The impact of noiseless feedback on the capacity of this channel is studied by focusing on the Gaussian cyclic Z-interference channel. To this end, the symmetric feedback capacity of the linear shift deterministic cyclic Z-interference channel is completely characterized for all interference regimes. Using insights from the linear deterministic channel model, the symmetric feedback capacity of the Gaussian cyclic Z-interference channel is characterized up to within a constant number of bits. As a byproduct of the constant gap result, the symmetric generalized degrees of freedom with feedback for the Gaussian cyclic Z-interference channel are also characterized. These results highlight that the symmetric feedback capacities for both linear and Gaussian channel models are in general functions of K , the number of users. Furthermore, the capacity gain obtained due to feedback decreases as K increases.|
|Citation:||Tandon, Ravi, Soheil Mohajer, and H. Vincent Poor. "On the symmetric feedback capacity of the K-user cyclic Z-interference channel." IEEE Transactions on Information Theory 59, no. 5 (2012): 2713-2734. doi:10.1109/TIT.2012.2235904|
|Pages:||2713 - 2734|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||IEEE Transactions on Information Theory|
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