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Mutual Information Analysis for Generalized Spatial Modulation Systems With Multilevel Coding

  • Generalized Spatial Modulation (GSM) enables a trade-off between very high spectral efficiencies and low hardware costs for massive MIMO systems. This is achieved by transmitting information via the selection of active antennas from a set of available antennas besides the transmission of conventional data symbols. GSM systems have been investigated concerning various aspects like suitable signal constellations, efficient detection algorithms, hardware implementations, spatial precoding, and error control coding. On the other hand, determining the capacity of GSM is challenging because no closed-form expressions have been found so far. This paper investigates the mutual information for different GSM variants. We consider a multilevel coding approach, where the antenna selection and IQ modulation are encoded independently. Combined with multistage decoding, such an approach enables low-complexity capacity-achieving coded modulation. The influence of the data symbols on the mutual information is illuminated. We analyze the portions of mutual information related to antenna selection and the IQ modulation processes which depend on the GSM variant and the signal constellation. Moreover, the potential of spatial modulation for massive MIMO systems with many transmit antennas is investigated. Especially in systems with many transmit antennas much information can be conveyed by antenna selection.

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Author:Volker KühnORCiD, Daniel Nicolas BailonORCiD, Jürgen FreudenbergerORCiDGND
Parent Title (English):IEEE Open Journal of the Communications Society
Volume:Vol. 3
Document Type:Article
Year of Publication:2022
Release Date:2022/11/22
Tag:Spatial modulation; Information theory; Capacity
First Page:1222
Last Page:1233
Corresponding author: Jürgen Freudenberger
Open Access?:Ja
Relevance:Peer reviewed Publikation in Master Journal List
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International