Time-varying Channel Estimation and Symbol Detection Using Superimposed Training in OFDM Systems
Wireless Personal Communications: An International Journal
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
Soft iterative channel estimator for BICM-ID-SSD over time-varying flat fading channels
WTS'09 Proceedings of the 2009 conference on Wireless Telecommunications Symposium
Unitary differential space-time-frequency codes for MB-OFDM UWB
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
Differential space-time-frequency codes for MB-OFDM UWB with dual carrier modulation
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Optimal superimposed training sequences for channel estimation in MIMO-OFDM systems
EURASIP Journal on Advances in Signal Processing
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This paper proposes a channel estimation algorithm using super-imposed pilots for OFDM systems. The pilot symbols are added linearly to the modulated data symbol at a fraction of the total transmit power, making the method spectrally efficient. We present a series of iterative and non-iterative receivers in which complexity is traded for performance. In particular, a high complexity non-iterative receiver that achieves the theoretically lowest BER and a low complexity iterative receiver that show near-optimal performance are presented. The proposed iterative receiver offers a 50 - 98% reduction in complexity over a non- iterative receiver having equivalent performance, depending on the modulation used. We observe that the performance of the receiver is independent of the channel's Doppler frequency and delay spread. Finally, we compute an analytic bound for the bit error rate of the proposed non-iterative receiver.