Adapting Side Information to Transmission Conditions in Precoding Systems

  • Josmary Labrador
  • Paula M. CastroEmail author
  • Adriana Dapena
  • Francisco J. Vazquez-Araujo
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10338)


This work proposes an hybrid precoding method in a Multiple-Input/Multiple-Output Frequency Division Duplex (MIMO FDD) system with the objective of reducing the load associated to transmit side information needed to adapt precoding matrices in both the transmitter and the receiver. The type of precoding is determined at the transmitter by using a simple rule that takes into account a receive Signal–to–Noise Ratio (SNR) estimate. The receiver computes the magnitude of the channel level fluctuations and determines the time instants when long pilot sequences are needed to estimate the precoding matrices. Using a low cost feedback channel, the receiver indicates to the transmitter both the type of precoder and transmit frames to be used.


Channel Estimation Channel State Information Pilot Symbol Feedback Channel Linear Minimum Mean Square Error 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work has been funded by the Galician Government under grants ED431C 2016-045 and ED341D R2016/012 as well as by the Spanish Government under grants TEC2013-47141-C4-1-R (RACHEL project) and TEC2016-75067-C4-1-R (CARMEN project).


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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Josmary Labrador
    • 1
  • Paula M. Castro
    • 1
    Email author
  • Adriana Dapena
    • 1
  • Francisco J. Vazquez-Araujo
    • 1
  1. 1.Department of Computer EngineeringUniversity of A CoruñaA CoruñaSpain

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