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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Davis, L.M. Srinivasan, S. Sirianunpiboon, S. |
| Copyright Year | 2010 |
| Abstract | Space-time codes built with multiplexed Alamouti components provide multiplexing as well as diversity gain. Their orthogonal structure also leads to simpler decoding algorithms. We consider a $4\times2$ system with multiplexed Alamouti codes. An exhaustive search maximum likelihood (ML) decoding for a $4 \times 2$ system is of order $M^4$, for a modulation scheme with constellation size $M$. For multiplexed orthogonal designs, an exact fast ML decoding algorithm has recently been reported whose complexity order is $M^2$ for a $4 \times 2$ system with QAM constellations. Nevertheless, the quadratic complexity of this fast ML algorithm may still be infeasible in practice for large constellations (e.g. $M \geq$ 64 QAM). In this paper, we present a method for designing low complexity sub-optimal decoders based on a combination of search based ML decoding and linear decoding. Our formulation facilitates a direct investigation of the trade-off between performance and complexity. The complexity of our hybrid decoder is flexible and it can be fixed based on the desired performance for a hardware implementation. Although extendable to more general multiplexed Alamouti systems, we focus here on a $4\times2$ space-time-polarization system comprising of two dual-polarized transmit antennas and one dual-polarized receive antenna. |
| Starting Page | 1 |
| Ending Page | 5 |
| File Size | 145137 |
| Page Count | 5 |
| File Format | |
| ISBN | 9781424425181 |
| ISSN | 15502252 |
| DOI | 10.1109/VETECS.2010.5493714 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2010-05-16 |
| Publisher Place | Taiwan |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Maximum likelihood decoding Receiving antennas Quadrature amplitude modulation Transmitting antennas Bayesian methods Vectors Detectors Interference cancellation Space technology Diversity methods |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Electrical and Electronic Engineering Computer Science Applications |
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