Blind Receiver for Multi-Layered Space-Frequency Coded MIMO Schemes Based on Temporally Extended Linear Constellation Precoding

This work formulates a new receiver for the blind decoding of multi-layered space-frequency codes (MLSFC) in multiple input multiple output (MIMO) systems based on orthogonal frequency division multiplexing (OFDM). We introduce a slight modification on the standard MLSFC transmit structure with linear constellation precoding, which consists in extending the constellation rotation across multiple OFDM symbols. Thanks to this added feature, we formulate the received signal as a three-way array following a parallel factor (PARAFAC) model exploiting the powerful uniqueness property of this tensor model, blind MLSFC decoding is guaranteed under mild conditions using an alternating least squares estimation algorithm. Our preliminary numerical results illustrate the bit error rate (BER) performance of the proposed receiver in comparison with the non-blind zero-forcing based MLSFC receiver that assumes perfect channel knowledge.