Joint switched transmit diversity and adaptive modulation in spectrum sharing systems

Khalid A. Qaraqe, Zied Bouida, Mohamed Abdallah, Mohamed Slim Alouini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Under the scenario of an underlay cognitive radio network, we propose in this paper an adaptive scheme using switched transmit diversity and adaptive modulation in order to minimize the average number of switched branches at the secondary transmitter while increasing the capacity of the secondary link. The proposed switching efficient scheme (SES) uses the scan and wait (SWC) combining technique where a transmission occurs only when a branch with an acceptable performance is found, otherwise data is buffered. In our scheme, the modulation constellation size and the used transmit branch are determined to achieve the highest spectral efficiency with a minimum processing power, given the fading channel conditions, the required error rate performance, and a peak interference constraint to the primary receiver. Selected numerical examples show that the SES scheme minimizes the average number of switched branches for the average and the high secondary signal-to-noise ratio range. This improvement comes at the expense of a small delay introduced by the SWC technique. For reference, we also compare the performance of the SES scheme to the selection diversity scheme (SDS) where the best branch verifying the modulation mode and the interference constraint is always selected.

Original languageEnglish
Title of host publicationProceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011
Pages86-90
Number of pages5
DOIs
Publication statusPublished - 24 Oct 2011
Event2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011 - Osaka, Japan
Duration: 1 Jun 20113 Jun 2011

Publication series

NameProceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011

Other

Other2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011
CountryJapan
CityOsaka
Period1/6/113/6/11

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Keywords

  • Adaptive Modulation
  • Performance Analysis
  • Spectrum Sharing
  • Switched Diversity

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Communication

Cite this

Qaraqe, K. A., Bouida, Z., Abdallah, M., & Alouini, M. S. (2011). Joint switched transmit diversity and adaptive modulation in spectrum sharing systems. In Proceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011 (pp. 86-90). [6030753] (Proceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011). https://doi.org/10.4108/icst.crowncom.2011.246248