Two-hop MIMO relaying systems using random unitary beamforming in Gaussian broadcast channels

Do Hoon Kim, Jin Hee Lee, Young Chai Ko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this paper we propose the multi-user MIMO (MU-MIMO) with the fixed relay station (RS) transmissions scheme where the base station (BS) and the fixed RS are equipped with multiple antennas and the multiple users are equipped with a single antenna. Since the MU-MIMO can improve the sum capacity significantly by transmitting the data streams to multiple users simultaneously without much link gain while the fixed relay station can improve the link gain but loses the spectral efficiency due to the half-duplex transmission, our proposed scheme can compensate each of the drawbacks and can improve both the sum rate and the link gain. We adopt the practical random unitary beamforming (RUB) precoding method for MU-MIMO and the simple amplify-and-forward protocol for the operation of the relay station. Based on our proposed RUB based MU-MIMO with fixed RS, the sumcapacity is upper bounded by the channels between the BS and the RS, not by the channels between the RS and the users. We also show from our extensive simulations that our proposed scheme has lower complexity compartively and provides the performance commensurate with the schemes presented in the literature in terms of the sum-rate for the large user scenario.

Original languageEnglish
Title of host publicationProceedings - 2009 1st International Conference on Advances in Satellite and Space Communications, SPACOMM 2009
Pages69-73
Number of pages5
DOIs
Publication statusPublished - 2009 Nov 16
Event2009 1st International Conference on Advances in Satellite and Space Communications, SPACOMM 2009 - Colmar, France
Duration: 2009 Jul 202009 Jul 25

Publication series

NameProceedings - 2009 1st International Conference on Advances in Satellite and Space Communications, SPACOMM 2009

Other

Other2009 1st International Conference on Advances in Satellite and Space Communications, SPACOMM 2009
CountryFrance
CityColmar
Period09/7/2009/7/25

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Keywords

  • And relay stations
  • Muti-user MIMO
  • Random unitary beamforming

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing
  • Electrical and Electronic Engineering

Cite this

Kim, D. H., Lee, J. H., & Ko, Y. C. (2009). Two-hop MIMO relaying systems using random unitary beamforming in Gaussian broadcast channels. In Proceedings - 2009 1st International Conference on Advances in Satellite and Space Communications, SPACOMM 2009 (pp. 69-73). [5194588] (Proceedings - 2009 1st International Conference on Advances in Satellite and Space Communications, SPACOMM 2009). https://doi.org/10.1109/SPACOMM.2009.42