A robust channel estimator for high-mobility STBC-OFDM systems

Hsiao Yun Chen*, Meng Lin Ku, Shyh-Jye Jou, Chia-Chi Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

In this paper, a robust channel estimator for high-mobility space-time block code-orthogonal frequency division multiplexing (STBC-OFDM) systems is proposed and applied in IEEE 802.16e systems. A high-performance two-stage channel estimation method is adopted. The proposed architecture reduces computational complexity effectively and improves 85.2% of the hardware implementation. The performances of the proposed design have been demonstrated through the simulation of an STBC-OFDM system with two transmit antennas and one receive antenna. At the vehicle speed of 120 and 240 km/hr for quadrature phase shift keying (QPSK) modulation, the proposed design can achieve the bit-error rate (BER) of about 10-4 and 10-3 without using channel coding. Moreover, it has significant performance improvement as compared with interpolation-based channel estimation methods. The proposed channel estimator implemented in 90 nm CMOS technology can support up to 29.03 Mbps (uncoded) downlink data transmission. The design only requires 859.6 K gates and dissipates 43.71 mW at 83.3 MHz operating frequency with 1 V power supply.

Original languageEnglish
Article number5357412
Pages (from-to)925-936
Number of pages12
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume57
Issue number4
DOIs
StatePublished - 1 Jan 2010

Keywords

  • Channel estimator
  • IEEE 802.16e
  • Orthogonal frequency division multiplexing
  • Space-time block code

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