Diversity Analysis of Hierarchical Modulation in Cooperative Communication

Date

2014-01-01

Author

Yalcin, Ahmet Zahid
Yüksel Turgut, Ayşe Melda

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In cooperative communication systems, hierarchical modulation is used to increase systems robustness and to send different information flows simultaneously. In cooperative communication systems which use hierarchical modulation, error propagation is the most important problem that prevents achieving full diversity gain. Thresholds that depend on the signal to noise ratio (SNR) value between the source and the relay can be used to mitigate error propagation. If the instantaneous SNR between the source and the relay is lower than the first threshold, the relay does not transmit. If the SNR is between the first and the second thresholds, the relay demodulates and forwards only the primary bits. If the SNR is higher than the second threshold, the relay demodulates and forwards both the primary and the secondary bits. Mitigating error propagation and achieving full diversity for both primary (high priority) and secondary (low priority) bits depend on setting the thresholds at the relay properly. In this work, the first and the second threshold values are determined so that full diversity gains are attained for both primary and secondary bits. Analytical and simulation results are provided to verify the analysis.

Subject Keywords

Hierarchical Modulation, Cooperative Communication, Relay Networks, Threshold Selection, Diversity Analysis, UNEQUAL ERROR PROTECTION

URI

https://hdl.handle.net/11511/96576

DOI

https://doi.org/10.1109/siu.2014.6830484

Conference Name

22nd IEEE Signal Processing and Communications Applications Conference (SIU)

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

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Citation Formats

A. Z. Yalcin and A. M. Yüksel Turgut, “Diversity Analysis of Hierarchical Modulation in Cooperative Communication,” presented at the 22nd IEEE Signal Processing and Communications Applications Conference (SIU), Trabzon, Türkiye, 2014, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/96576.