Single Carrier with Frequency-Domain Equalization (SC-FDE) combined with antenna diversity are promising candidates for future broadband wireless systems. On the other hand, pilot symbols and/or training sequences are usually multiplexed with data symbols. Since this leads to overhead and some spectral degradation, the use of superimposed pilots (i.e., pilots added to data) was recently proposed.
In this paper, we consider iterative frequency-domain receivers for block transmission techniques with rate-1 Space Time Block Coding (STBC) for two or four transmit antennas. Since our STBC with 4 transmit antennas is not orthogonal, our receiver includes the cancellation of the residual interference, allowing performances close to the ones of an orthogonal code. We propose an iterative STBC receiver with joint detection and channel estimation. Our performance results show that the proposed SC-FDE STBC receiver allows excellent performance with the use of the channel data obtained from the channel estimation.