Least-squares channel estimation assisted by self-interference cancellation for mobile pseudo-random-postfix orthogonal-frequency-division multiplexing applications

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Communication Engineering > journal & Dissertation > Item 987654321/29081

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/29081

Title:	Least-squares channel estimation assisted by self-interference cancellation for mobile pseudo-random-postfix orthogonal-frequency-division multiplexing applications
Authors:	Lin,JC
Contributors:	通訊工程研究所
Keywords:	SELECTIVE FADING CHANNELS;OFDM SYSTEMS;TRANSMISSIONS
Date:	2009
Issue Date:	2010-06-29 20:12:50 (UTC+8)
Publisher:	中央大學
Abstract:	A least-squares (LS) channel estimation (CE) technique is investigated to apply pseudo-random-postfix orthogonal-frequency-division multiplexing (PRP-OFDM) communications onto mobile applications, which often operate on a rapidly time-varying frequency-selective fading channel. Since conventional techniques exploiting a moving averager cannot function on a rapidly time-varying channel, the proposed technique takes advantage of several self-interference cancellation (SIC) methods to effectively and timely reduce inter-path interference, inter-symbol interference (ISI) and inter-block interference (IBI). The proposed technique can therefore overcome frequency selectivity caused by multipath fading and time selectivity caused by mobility; in particular, OFDM communication is often anticipated to operate in environments where both wide Doppler spread and long delay spread exist. Meanwhile, lower mean-square estimation errors, lower error probabilities and lower error floors can also be achieved using the proposed technique. Since conventional techniques based on minimum-mean-square-error (MMSE) CE usually highly require a priori channel information or many training preambles, a generic estimator assisted from LS CE is exploited as it can be performed serially, block by block, to reduce computational complexity. Extensive computer simulations in conjunction with strict statistical analysis are carried out to verify the improvements provided by the proposed technique.
Relation:	IET COMMUNICATIONS
Appears in Collections:	[Graduate Institute of Communication Engineering] journal & Dissertation

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