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Cooperative Communications over Flat Fading Channels with Carrier Offsets: A Double-Differential Modulation Approach

Abstract

We propose double-differential (DD) modulation for the amplify-and-forward protocol over Nakagami- fading channels with carrier offsets. We propose an emulated maximum ratio combining (EMRC) decoder, which could be used by the double-differential receiver in the absence of exact channel knowledge. Approximate bit error rate (BER) analysis is performed for the proposed double-differential modulation-based cooperative communication system. The proposed double-differential system is immune to random carrier offsets, whereas the conventional single-differential modulation-based cooperative system breaks down. In addition, the proposed scheme is able to perform better than the same rate training-based cooperative system which utilizes training data for finding estimates of carrier offsets and channel gains.

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Correspondence to Manav R. Bhatnagar.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Bhatnagar, M.R., Hjørungnes, A. & Song, L. Cooperative Communications over Flat Fading Channels with Carrier Offsets: A Double-Differential Modulation Approach. EURASIP J. Adv. Signal Process. 2008, 531786 (2008). https://doi.org/10.1155/2008/531786

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Keywords

  • Error Rate
  • Information Technology
  • Training Data
  • Communication System
  • Quantum Information