OFDM packet transmission system with added pilot semi-blind iterative channel estimation for tracking fast time-varying channel

Naoto Ohkubo, Tomoaki Ohtsuki

Research output: Contribution to journalArticle


Orthogonal Frequency Division Multiplexing (OFDM) is a promising technique for achieving high bit-rate transmission in radio environments. Various techniques to estimate channel attenuation have been proposed for OFDM transmission. In these techniques, the added pilot semi-blind (APSB) channel estimation has been proposed, which does not require any additional bandwidth. For an OFDM packet transmission that includes preambles, it is difficult to track the channel variation of the latter of packet due to time-varying channels in fast fading environments. We expect that the channel estimation is improved by applying the APSB channel estimation technique to the last symbols of packets without any additional bandwidth or degradation of bit rate. In this paper, we propose an OFDM packet transmission system with APSB channel estimation technique where this technique is applied to the last symbols of packets. We expect that the proposed system can track the fast time-variant channels without decrease of the data-rate, and the packet error rate (PER) is improved, We show that our proposed system is effective for improving the accuracy of the channel estimate in fast fading channels.

Original languageEnglish
Pages (from-to)2729-2737
Number of pages9
JournalIEICE Transactions on Communications
Issue number9
Publication statusPublished - 2004 Sep
Externally publishedYes



  • Added pilot semi-blind channel estimation
  • OFDM

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

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