Éditorial

Interference cancellation in coded OFDM/OQAM

“…On the other hand, the invention of the Turbo codes by Claude Berrou at al., [10], and the iterative algorithms [11] started to be used to implement the Turbo equalization or Turbo interferences cancellation [12], with just linear complexity with respect to the channel impulse response lengths. Whatsoever, the concatenation of the soft successive self-interference cancellation and channel decoding procedure in Turbo mode, [13], offers additional enhancement of the overall performance. It has been proposed and analyzed in [14] for an ISI/ICI canceller in COFDM/OQAM based on development of Turbo-codes and message passing decoding algorithms during the last two decades.…”

“…The control nodes associated with the QAM modulation evaluate the extrinsic probability of the coded bits from the preceding extrinsic probabilities of the modulated symbols. A SISO decoder evaluates the a posteriori probabilities of the information bits and returns the extrinsic probabilities of the coded bits, as for a more classical turbo-equalization algorithm [13]. Then the extrinsic probabilities of the modulated symbols are evaluated from the extrinsic probabilities of the coded bits, and used to determine soft decisions to be subsequently used for canceling the multiple-input singleoutput (MISO) interference, in combination with the estimated real-valued impulse response samples.…”