Signal constellations employing multiplicative groups of Gaussian and Eisenstein integers for Enhanced Spatial Modulation
| Autor: | K Shriharsha, U. Shripathi Acharya, Raghavendra M.A.N.S., G D Goutham Simha |
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| Rok vydání: | 2017 |
| Předmět: |
Discrete mathematics
Gaussian integer Gaussian 020302 automobile design & engineering 020206 networking & telecommunications Constellation diagram 02 engineering and technology Spectral efficiency Upper and lower bounds symbols.namesake 0203 mechanical engineering Eisenstein integer 0202 electrical engineering electronic engineering information engineering symbols Bit error rate Electrical and Electronic Engineering Algorithm Pairwise error probability Computer Science::Information Theory Mathematics |
| Zdroj: | Physical Communication. 25:546-554 |
| ISSN: | 1874-4907 |
| DOI: | 10.1016/j.phycom.2017.10.012 |
| Popis: | In this paper, we propose two new signal constellation designs employing Gaussian and Eisenstein Integers for Enhanced Spatial Modulation (ESM). ESM is a novel technique which was propounded by Cheng et al. The advantage of ESM over other Spatial Modulation (SM) schemes lies in its ability to enhance spectral efficiency while keeping the energy efficiency intact. This is done by activating either one or two antennas judiciously depending upon the required trade-off. In ESM, information radiated from the antennas depends upon index of the active transmit antenna combination(s) and also on the set of constellation points chosen, which may include points from multiple constellations. In this paper, we propose signal constellations based on multiplicative groups of Gaussian and Eisenstein integers. The set comprising of Gaussian and Eisenstein integers serves as primary and secondary constellation points for Gaussian Enhanced Spatial Modulation (GESM) scheme. The secondary constellation points are deduced from a single geometric interpolation from the primary constellation points. The Monte Carlo simulation results indicate that the proposed nonuniform constellations achieve impressive SNR gains compared to conventional constellation points used in the design of ESM. This new design has been described for MIMO employing 4 × 4 and 8 × 8 antenna configurations with only two active antennas. Furthermore, a closed form expression for the pairwise error probability (PEP) for the GESM scheme has been deduced. The PEP is utilized to determine the upper bound on the average bit error probability (ABEP). Our simulations indicate that the proposed GESM from Gaussian and Eisenstein integers scheme outperforms all the other variants of SM including conventional ESM by at least 2.5 dB at an average bit error ratio (ABER) of 10 − 5 . Close correspondence between the theoretical analysis and the Monte Carlo simulation results are observed. |
| Databáze: | OpenAIRE |
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