A lattice-theoretic analysis of vector perturbation for multi-user MIMO systems

Daniel J. Ryan, Iain B. Collings, I. Vaughan L Clarkson, Robert W. Heath

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

10 Citations (Scopus)

Abstract

This paper considers the use of multiple transmit antennas to deliver independent data streams to multiple users. In particular, we examine a multi-user technique known as vector perturbation. We provide a new lattice-theoretic approach to analyze its performance in the presence of Rayleigh fading. Vector perturbation is based on performing a channel inversion, with the additional step of perturbing the data signal prior to linear precoding to significantly reduce the required transmit power. To analyze such systems it is necessary to calculate the resulting average energy of the sphere-encoded signal vector, as this determines the signal-to-noise ratio (SNR) at the output of the demodulator. Previous results presented in the literature were partially analytic, requiring further numerical evaluation. Here, we derive a concise approximation to the output SNR. We also provide tight upper and lower bounds on the bit error rate for the reception of QAM symbols using the required modulo demodulator, as a function of the average energy of the sphere-encoded signal vector.

Original languageEnglish
Title of host publicationICC 2008 - IEEE International Conference on Communications, Proceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages3340-3344
Number of pages5
ISBN (Print)9781424420742
DOIs
Publication statusPublished - 2008
Externally publishedYes
EventIEEE International Conference on Communications, ICC 2008 - Beijing, China
Duration: 19 May 200823 May 2008

Other

OtherIEEE International Conference on Communications, ICC 2008
CountryChina
CityBeijing
Period19/05/0823/05/08

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  • Cite this

    Ryan, D. J., Collings, I. B., Clarkson, I. V. L., & Heath, R. W. (2008). A lattice-theoretic analysis of vector perturbation for multi-user MIMO systems. In ICC 2008 - IEEE International Conference on Communications, Proceedings (pp. 3340-3344). [4533664] Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/ICC.2008.628