Mobile WiMAX: impact of mobility on the performance of limited feedback linear precoding

T Tran, AR Nix, A Doufexi

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)
391 Downloads (Pure)


The mobile WiMAX standard (802.16e) uses multiple-input multiple-output (MIMO) limited feedback linear precoding to exploit the channel state information at the transmitter. Although the performance of limited feedback linear precoding in relation to traditional open-loop MIMO has been extensively studied in the literature, these studies commonly assume a zero-lag feedback channel. However, due to the mobile nature of the mobile station (MS), the channel feedback information at the base station (BS) is incorrect because of an inherent delay between the time the MS estimates the channel feedback information and the time it is used in the BS. This results in performance degradation compared to a zero-lag feedback channel. To date, few researchers have studied the impact of MS velocity and Doppler spread on the performance of limited feedback linear precoding. Simulation results show that the performance of the mobile WiMAX precoded system degrades significantly as the MS velocity increases. At a velocity of 3km/h the precoded system degrades by 0.1-0.2dB in terms of array gain. However, the performance drops considerably when the velocity exceeds 10 km/h. At high MS velocities (i.e., 120 km/h), the linear precoding technique fails to provide any benefits. In this high mobility case we show that a linear precoding MIMO system with more antennas experiences the same performance as an open-loop MIMO system with fewer antennas.
Translated title of the contributionMobile WiMAX: impact of mobility on the performance of limited feedback linear precoding
Original languageEnglish
Title of host publicationIEEE 71st Vehicular Technology Conference 2010 (VTC 2010-Spring), Taipei, Taiwan
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1 - 5
Number of pages5
ISBN (Print)9781424425181
Publication statusPublished - May 2010
Event71st Vehicular Technology Conference 2010 (VTC 2010-Spring) - Taipei, Taiwan
Duration: 1 May 2010 → …

Publication series

ISSN (Print)15502252


Conference71st Vehicular Technology Conference 2010 (VTC 2010-Spring)
Period1/05/10 → …

Bibliographical note

Rose publication type: Conference contribution

Terms of use: Copyright © 2010 IEEE. Reprinted from IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), 2010.

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  • 802.16e
  • WiMAX
  • MIMO
  • linear precoding


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