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A coherent detection of OFDM signals (Orthogonal Frequency Division Multiplexing) allows good performances in severely time-dispersive channels. However, coherent receivers require good channel estimates, a difficult task when the channel impulse response is long and/or when space diversity techniques are employed. Usually, the channel estimates are obtained with the help of pilot symbols multiplexed...
Accurate channel estimation is mandatory for the performance of OFDM modulations (orthogonal frequency division multiplexing). For this purpose, pilot symbols and/or training sequences are usually multiplexed with data symbols. To avoid the spectral degradation associated to multiplexed pilots, the use of implicit pilots (i.e., pilots superimposed to data) was recently proposed. However, the interference...
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