A threshold computation approach for the selection of additional pilot symbols

KALAYCIOĞLU A., İLK H. G.

9th WSEAS International Conference on Telecommunications and Informatics, TELE-INFO '10, Catania, İtalya, 29 - 31 Mayıs 2010, ss.74-78 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Catania
  • Basıldığı Ülke: İtalya
  • Sayfa Sayıları: ss.74-78
  • Anahtar Kelimeler: Adaptive, Additional pilots, Computed threshold, Error correction decoder, HF, Soft outputs
  • Ankara Üniversitesi Adresli: Evet

Özet

An adaptive threshold computation method for pilot symbol assisted iterative channel estimation in coded OFDM systems is considered. The proposed threshold computation method is based on calculating a particular threshold for each data packet in order to select the reliable decoder output symbols to improve the system bit error rate performance. The adaptive threshold computation approach utilizes the statistical properties of the decoder output symbol reliabilities. In an iterative manner, additional pilot symbols are established according to the computed threshold and the channel is re-estimated with the new pilots inserted to the known channel estimation pilot set. The proposed threshold computation method improves the system bit error rate performance in poor HF channel simulations.