MIMO systems in the presence of feedback delay

Kenichi Kobayashi, Tomoaki Ohtsuki, Toshinobu Kaneko

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

14 Citations (Scopus)

Abstract

Recently, multiple-input multiple-output (MIMO) systems that realize a high bit rate data transmission with multiple antennas at both transmitter and receiver have drawn much attention for high spectral efficiencies. In MIMO systems, eigen-beam space division multiplexing (E-SDM) that achieves good performance by weighting at the transmitter using channel state information (CSI) has been studied. Early studies for ESDM have assumed perfect CSI at the transmitter. However, in practice, CSI fed back to the transmitter is not identical to that when the signals are transmitted owing to the time-varying nature of channels and feedback delay. As a result, the performance of E-SDM is degraded. In this paper, as methods that reduce the performance degradation of E-SDM in the presence of feedback delay, we evaluate the performance of a method that predicts CSI when the signals are transmitted at the receiver and feeds the predicted CSI back to the transmitter (denoted by channel prediction method). We also evaluate the performance of a method that uses the receive weight based on zero-forcing (ZF) or minimum mean square error (MMSE) criterion instead of those based on singular value decomposition (SVD) criterion (denoted by ZF or MMSE receive weight method). Simulation results show that bit error rate (BER) degradation of E-SDM in the presence of feedback delay is reduced by three methods. We also show that the ZF and MMSE receive weight methods achieve the identical BER with smaller amount of calculation than the channel prediction method.

Original languageEnglish
Title of host publication2006 IEEE International Conference on Communications, ICC 2006
Pages4102-4106
Number of pages5
DOIs
Publication statusPublished - 2006 Dec 1
Event2006 IEEE International Conference on Communications, ICC 2006 - Istanbul, Turkey
Duration: 2006 Jul 112006 Jul 15

Publication series

NameIEEE International Conference on Communications
Volume9
ISSN (Print)0536-1486

Other

Other2006 IEEE International Conference on Communications, ICC 2006
CountryTurkey
CityIstanbul
Period06/7/1106/7/15

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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    Kobayashi, K., Ohtsuki, T., & Kaneko, T. (2006). MIMO systems in the presence of feedback delay. In 2006 IEEE International Conference on Communications, ICC 2006 (pp. 4102-4106). [4025125] (IEEE International Conference on Communications; Vol. 9). https://doi.org/10.1109/ICC.2006.255723