A Study on Channel Estimation Methods for Time-Domain Spreading MC-CDMA Systems

Atsushi NAGATE
Teruya FUJII

IEICE TRANSACTIONS on Communications   Vol.E92-B    No.3    pp.980-991
Publication Date: 2009/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.980
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Terrestrial Radio Communications
MC-CDMA,  time domain spreading,  channel estimation,  weight,  coherent addition,  

Full Text: PDF(1.6MB)>>
Buy this Article

As a candidate for the transmission technology of next generation mobile communication systems, time-domain spreading MC-CDMA systems have begun to attract much attention. In these systems, data and pilot symbols are spread in the time domain and code-multiplexed. To combat fading issues, we need to conduct channel estimation by using the code-multiplexed pilot symbols. Especially in next generation systems, frequency bands higher than those of current systems, which raise the maximum Doppler frequency, are expected to be used, so that a more powerful channel estimation method is expected. Considering this, we propose a channel estimation method for highly accurate channel estimation; it is a combination of a two-dimensional channel estimation method and an impulse response-based channel estimation method. We evaluate the proposed method by computer simulations.