A complexity-reduced time alignment control in uplink dynamic parameter controlled OF/TDMA

Ryota Kimura, Ryuhei Funada, Hiroshi Harada, Shigeru Shimamoto

Research output: Contribution to journalArticle


We have been investigating an orthogonal frequency division multiple access (OFDMA) based cellular system that is called "dynamic parameter controlled orthogonal frequency and time division multiple access (DPC-OF/TDMA)" for the development of beyond third generation (B3G) mobile communication systems. Moreover, we have already proposed a time alignment control (TAC) to compensate propagation delays that induce a multiple-access interference (MAI) in the uplink OFDMA. However, that TAC includes a large amount of computations. This means that it is quite difficult for the OFDMA systems to implement TAC into volume-limited hardware devices such as field programmable gate array (FPGA). Thus, we propose a new complexity-reduced TAC (CRTAC) in this paper. CRTAC can be implemented into such devices easily. In this paper, we show some computer simulation results, and then evaluate the error rate performances of DPC-OF/TDMA employing CRTAC. Moreover, we also show the benefit of the reasonable level of the implementation complexity made by CRTAC.

Original languageEnglish
Pages (from-to)2196-2207
Number of pages12
JournalIEICE Transactions on Communications
Issue number8
Publication statusPublished - 2006 Aug



  • Complexity reduction
  • Dynamic parameter controlled orthogonal frequency and time division multiple access (DPC-OF/TDMA)
  • Orthogonal frequency division multiple access (OFDMA)
  • Propagation delay
  • Time alignment control
  • Timing synchronization

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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