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Differentially encoded blind multicell multiuser massive MIMO

Fozi, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1109/ICCW.2015.7247316
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2015
  4. Abstract:
  5. In this paper, we consider the uplink of the narrowband multicell multiuser massive multiple-input multiple-output (MIMO) systems. In traditional approaches, orthogonal pilots among users of all (interfering) cells are utilized to estimate their channels assumed to be constant during channel coherence time. However, in multicell scenarios, such schemes suffer from pilot contamination. In order to address this issue, based on asymptotic pairwise orthogonality of the users' channels in massive regime, blind channel estimation schemes have been proposed. On the other hand, such schemes rely on low interference or high signal to noise ratio (SNR) levels, to achieve reliable performance. Inspired by the statistically noise-free 1-lag autocovariance matrix, we let the users' signal utilize a differential structure, by which, the effect of additive noise in such blind schemes is significantly reduced while preserving system robustness to out of cell interference. Numerical simulations are also used to verify the outperformance of the proposed scheme over the current pilot-based and blind schemes. © 2015 IEEE
  6. Keywords:
  7. Additive noise ; Channel estimation ; Communication channels (information theory) ; Interference suppression ; MIMO systems ; Signal interference ; Autocovariance matrices ; Blind channel estimation ; Differential structure ; High signalto-noise ratios (SNR) ; Massive multiple-input- multiple-output system (MIMO) ; Multi-cell scenarios ; Out-of-cell interference ; Traditional approaches ; Signal to noise ratio
  8. Source: IEEE International Conference on Communication Workshop, ICCW 2015, 8 June 2015 through 12 June 2015 ; June , 2015 , Pages 1054-1059 ; 9781467363051 (ISBN)
  9. URL: http://ieeexplore.ieee.org/document/7247316/?reload=true