A Complexity-Reduced Time Alignment Control in Uplink Dynamic Parameter Controlled OF/TDMA

Ryota KIMURA
Ryuhei FUNADA
Hiroshi HARADA
Shigeru SHIMAMOTO

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B    No.8    pp.2196-2207
Publication Date: 2006/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.8.2196
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Terrestrial Radio Communications
Keyword: 
orthogonal frequency division multiple access (OFDMA),  dynamic parameter controlled orthogonal frequency and time division multiple access (DPC-OF/TDMA),  propagation delay,  time alignment control,  timing synchronization,  complexity reduction,  

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Summary: 
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.