naa a22 4500 510796095 CHVBK 20180411083337.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11277-012-0506-9 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0506-9 Data Aided Iterative Channel Estimation in OFDM Systems Using a Controlled Superimposition of Training Sequences [Elektronische Daten] [Jinesh Nair, Ratnam Raja Kumar] This work pertains to the use of superimposed training for channel estimation in orthogonal frequency division multiplexing (OFDM) based systems. An iterative time domain Least Squares based channel estimator is proposed. The estimator is generalized to provide scope for exploiting the coherence time and the coherence bandwidth of the channel. By exploiting the periodicity of the training sequences in the time domain and inserting zeros instead of data at some of the training sequence subcarrier locations depending on the desired estimation accuracy, a controlled superimposition technique is proposed. This method includes the flexibility to trade off between bandwidth efficiency and performance without any change in the structure of the channel estimator. The mean squared estimation error (MSEE) performance of such a system is mathematically analyzed and a training sequence selection criterion optimizing the same is proposed. The simulation performance of the scheme is presented in terms of the MSEE and also its impact on the bit error rate is shown. Such a scheme is attractive in high data rate scenarios in closed loop OFDM systems. Springer Science+Business Media, LLC., 2012 Channel estimation nationallicence OFDM nationallicence Superimposed training nationallicence Nair Jinesh SAIT India Lab, Samsung Electronics India Pvt. Ltd., 560093, Bangalore, India aut Raja Kumar Ratnam Department of Electronics and Electrical Communication, IIT, 721302, Kharagpur, India aut Wireless Personal Communications Springer US; http://www.springer-ny.com 68/4(2013-02-01), 1241-1254 0929-6212 68:4<1241 2013 68 11277 https://doi.org/10.1007/s11277-012-0506-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0506-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nair Jinesh SAIT India Lab, Samsung Electronics India Pvt. Ltd., 560093, Bangalore, India aut NATIONALLICENCE 700 1- Raja Kumar Ratnam Department of Electronics and Electrical Communication, IIT, 721302, Kharagpur, India aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 68/4(2013-02-01), 1241-1254 0929-6212 68:4<1241 2013 68 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer