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    (Sub-)Optimality of Treating Interference as Noise in the Cellular Uplink With Weak Interference

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    Type
    Article
    Authors
    Gherekhloo, Soheil
    Chaaban, Anas cc
    Di, Chen
    Sezgin, Aydin
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2015-11-09
    Online Publication Date
    2015-11-09
    Print Publication Date
    2016-01
    Permanent link to this record
    http://hdl.handle.net/10754/602308
    
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    Abstract
    Despite the simplicity of the scheme of treating interference as noise (TIN), it was shown to be sum-capacity optimal in the Gaussian interference channel (IC) with very-weak (noisy) interference. In this paper, the two-user IC is altered by introducing an additional transmitter that wants to communicate with one of the receivers of the IC. The resulting network thus consists of a point-to-point channel interfering with a multiple access channel (MAC) and is denoted by PIMAC. The sum-capacity of the PIMAC is studied with main focus on the optimality of TIN. It turns out that TIN in its naive variant, where all transmitters are active and both receivers use TIN for decoding, is not the best choice for the PIMAC. In fact, a scheme that combines both time division multiple access and TIN (TDMA-TIN) strictly outperforms the naive-TIN scheme. Furthermore, it is shown that in some regimes, TDMA-TIN achieves the sum-capacity for the deterministic PIMAC and the sum-capacity within a constant gap for the Gaussian PIMAC. In addition, it is shown that, even for very-weak interference, there are some regimes where a combination of interference alignment with power control and TIN at the receiver side outperforms TDMA-TIN. As a consequence, on the one hand, TIN in a cellular uplink is approximately optimal in certain regimes. On the other hand, those regimes cannot be simply described by the strength of interference.
    Citation
    (Sub-)Optimality of Treating Interference as Noise in the Cellular Uplink With Weak Interference 2016, 62 (1):322 IEEE Transactions on Information Theory
    Sponsors
    The authors would like to thank the reviewers and the editor for invaluable comments which helped significantly improve the quality of this paper.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Information Theory
    DOI
    10.1109/TIT.2015.2499189
    Additional Links
    http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=7322253
    ae974a485f413a2113503eed53cd6c53
    10.1109/TIT.2015.2499189
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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