Transmit Precoded Spatial Modulation: Maximizing the Minimum Euclidean Distance Versus Minimizing the Bit Error Ratio

Ping Yang Yong Liang Li 1 Yue Xiao Marco Di Renzo 2 Shaoqian Li 3 Lajos Hanzo 4
1 CREATIS - Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé
2 L2S - Laboratoire des signaux et systèmes
3 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
4 ECS - School of Electronics and Computer Science
Abstract : In this paper, we investigate a pair of transmit precoding (TPC) algorithms conceived for spatial modulation (SM) systems communicating over flat-fading multiple-input multiple-output (MIMO) channels. In order to retain all the benefits of conventional SM, we design the TPC matrix to be diagonal and introduce two design criteria for optimizing the elements of the TPC matrix. Specifically, we first investigate a TPC design based on maximizing the minimum Euclidean distance dmin (max-dmin) between the SM signal points at the receiver side. A closed-form solution of the optimal max-dmin-based TPC matrix is derived. Then, another TPC design algorithm is proposed for directly minimizing the bit error ratio (BER) upper bound of SM, which is capable of jointly optimizing the overall Euclidean distance between all received signal points. In the minimum BER (min-BER)-based TPC algorithm, the theoretical gradient of the BER with respect to the diagonal TPC matrix is derived and a simplified iterative conjugate gradient (SCG) algorithm is invoked for TPC optimization. Our simulation results demonstrate that the proposed max-dmin-based TPC algorithm is optimal in terms of the minimum distance. However, increasing dmin does not achieve a further BER improvement. We also confirm that the min-BER-based TPC outperforms the max-dmin-based TPC schemes in terms of the achievable BER performance.
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IEEE Transactions on Wireless Communications, Institute of Electrical and Electronics Engineers, 2016, 15 (3), pp.2054 - 2068. 〈10.1109/TWC.2015.2497692〉
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https://hal-centralesupelec.archives-ouvertes.fr/hal-01269553
Contributeur : Myriam Baverel <>
Soumis le : vendredi 5 février 2016 - 09:05:29
Dernière modification le : jeudi 11 octobre 2018 - 17:00:46

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Ping Yang, Yong Liang Li, Yue Xiao, Marco Di Renzo, Shaoqian Li, et al.. Transmit Precoded Spatial Modulation: Maximizing the Minimum Euclidean Distance Versus Minimizing the Bit Error Ratio. IEEE Transactions on Wireless Communications, Institute of Electrical and Electronics Engineers, 2016, 15 (3), pp.2054 - 2068. 〈10.1109/TWC.2015.2497692〉. 〈hal-01269553〉

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