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This contribution describes a novel iterative radio channel estimation algorithm based on superimposed training (ST) estimation technique. The proposed algorithm draws an analogy with the data dependent ST (DDST) algorithm, that is, extracts the cycling mean of the data, but in this case at the receiver's end. We first demonstrate that this mean removal ST (MRST) applied to estimate a single-input single-output (SISO) wideband channel results in similar bit error rate (BER) performance in comparison with other iterative techniques, but with less complexity. Subsequently, we jointly use the MRST and Alamouti coding to obtain an estimate of the multiple-input multiple-output (MIMO) narrowband radio channel. The impact of imperfect channel on the BER performance is evidenced by a comparison between the MRST method and the best iterative techniques found in the literature. The proposed algorithm shows a good tradeoff performance between complexity, channel estimation error, and noise immunity.

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Hybrid MIMO communication systems are defined as a combination of architectures designed to achieve both multiplexing gain (such as VBLAST), and diversity gain, (such as STBC) such that transmission schemes that have both high spectral efficiency and link reliability can be developed. In this paper we introduce a new way to represent hybrid systems, in which the detection process is carried out in a unified manner for both spatial and diversity transmitted symbols, using an OSIC algorithm, but symbol by symbol, just as single VBLAST systems performs. In this paper we present an efficient and low-complexity, ordered, successive interference cancellation receiver based on sorted QR decomposition for the hybrid STBC-VBLAST transmission scheme. We show how the use of our detection scheme proposal outperforms other recent hybrid detection schemes in terms of bit error rate, even when there is precoding at the transmitter. We also show our proposal has lower complexity, achieved by exploiting the structure of the linear dispersion matrices. 1

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A new architecture for detection of Layered Quasi-Orthogonal Space-Time Block Codes (LQOSTBC) with receiver antenna selection over Rayleigh fading channels is presented. The LQOSTBC transmitter consists of a full-rate quasi-orthogonal space-time block code unit, plus one antenna operating as V-BLAST. The LQOSTBC receiver selects nR out of a total of NR available antennas using a low-complexity, nearly optimal algorithm. The proposed receiver is based on Successive Interference Cancellation (SIC) and the QR decomposition, suggesting a simple hardware implementation. It is designed for Zero-Forcing (ZF) criterion and a spatially uncorrelated channel. Reduced complexity is achieved by means of a convenient rearrangement of the channel matrix elements. The detection scheme proposed is compared to similar, recently reported techniques.'

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