Improved composite q-function approximation and its application in asep of digital modulations over fading channels

Aleksandar Markovic, Zoran Peric, Stefan Panic, Petar Spalevic, Zoran Todorovic

Research output: Contribution to journalArticle

1 Citation (Scopus)


In this paper, capitalizing on Mils ratio for Qfunction approximation, we have presented novel improved composite Q-function approximation. Based on our improved approximation, we have further presented tight approximation for the average symbol error probability (ASEP) expressions of digital modulations over Nakagami-m fading channels. First, comparison to other known Q-function closed-form approximations has been performed, and it has been shown that accuracy improvement has been achieved in the observed range of values. Further, it has been shown that by using proposed approximation, values of average symbol error probability (ASEP) for some applied modulation formats could be efficiently and accurately evaluated when transmission over Nakagami-m fading channels is observed. Also, it has been shown in the paper that by using proposed approximation, observed ASEP measures are bounded more closely, than by using other known Q-function closed-form approximations.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalElektronika ir Elektrotechnika
Issue number3
Publication statusPublished - 1 Jan 2017
Externally publishedYes



  • Function approximation
  • Gaussian distribution
  • Modulation
  • Nakagami distribution

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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