Pilot symbol assisted high speed packet transmission system based on adaptive OFDM in broadband mobile channel

Chang Jun Ahn, Iwao Sasase

Research output: Contribution to journalArticle

Abstract

4G mobile communication system requires the throughput of 10-100Mbps. Adaptive modulated OFDM system is promising technique for increasing the throughput. In the pilot symbol assisted high-speed packet transmission system, the data symbol duration is generally considered to be small compared to the coherence time. However, OFDM symbol duration is longer than the symbol duration of a single carrier system, so that the packet duration of the pilot symbol assisted high speed packet transmission system is long. In this case, the change of channel conditions is too fast to be accurately estimated by channel estimator at the receiver in high Doppler frequency, so that many errors occur during demodulation, especially with the data symbols at the end of each packet. In this paper, we consider the BER at various instantaneous Eb/N0 that includes the demodulation errors in high Doppler frequency. When the coherence time is ten times longer than the duration of a single packet, the channel can be closely approximated as an AWGN channel. Otherwise, the approximation breaks down and the above-mentioned errors that occur during demodulation must be taken into consideration. In this paper, we propose the pilot symbol assisted high speed packet transmission system based on adaptive OFDM using a novel lookup table to consider the demodulated errors and evaluate the throughput performance.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalJournal of Communications and Networks
Volume5
Issue number1
Publication statusPublished - 2003 Mar

Fingerprint

Orthogonal frequency division multiplexing
Demodulation
Throughput
4G mobile communication systems
Table lookup

Keywords

  • Adaptive OFDM
  • Coherence time
  • High-speed packet transmission
  • Instantaneous E /N

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems

Cite this

Pilot symbol assisted high speed packet transmission system based on adaptive OFDM in broadband mobile channel. / Ahn, Chang Jun; Sasase, Iwao.

In: Journal of Communications and Networks, Vol. 5, No. 1, 03.2003, p. 25-32.

Research output: Contribution to journalArticle

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