Covert communication using skewed alpha-stable distributions

ÇEK M. E.

ELECTRONICS LETTERS, cilt.51, sa.1, ss.116-117, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 51 Sayı: 1
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1049/el.2014.3323
  • Dergi Adı: ELECTRONICS LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.116-117
  • Anahtar Kelimeler: digital communication, higher order statistics, telecommunication security, error statistics, signal processing, bit error rate, BER, third-order statistic, fractional lower-order covariance, random signals, skewed alpha-stable distributions, FLOC, random carrier, binary information, covert communication system
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

A covert communication system using a random carrier having skewed alpha-stable distribution is introduced. The proposed method utilises the random signals with skewed alpha-stable distributions exhibiting antipodal characteristics to encode the binary information at the transmitter. The receiver recovers these positive and negative skewed alpha-stable distributed random signals by switching at different time instants, where only the receiver has the correct switching order. The third-order statistic, given as sample skewness, is used to determine the message inside the receiver structure. The main purpose of constructing such a communication system is to improve the security aspect by avoiding the self-repeating autocorrelation behaviour of the transmitted signal in the time domain. The improvement of security is shown by comparing the fractional lower-order covariance with the reference study. According to the bit error rate results, the proposed method also shows better performance when the impulsiveness of the random carrier having skewed stable distribution is increased.