Upper bounds on the free distance for trellis codes combined with CPFSK signals

Ertas T., Ali F.

ELECTRONICS LETTERS, cilt.33, sa.17, ss.1438-1440, 1997 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 33 Sayı: 17
  • Basım Tarihi: 1997
  • Doi Numarası: 10.1049/el:19970975
  • Dergi Adı: ELECTRONICS LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1438-1440
  • Bursa Uludağ Üniversitesi Adresli: Hayır

Özet

It is well-known that CPM schemes themselves exhibit attractive spectral efficiencies and that combining them with a rate m/(m + 1) external trellis encoder with 2(m+1)-level modulation results in better power-bandwidth performance. Since the free distance is a good measure of performance, the authors construct upper bounds on the ultimately achievable Free distance for trellis codes of Ungerboeck type combined with constant-envelope CPFSK signals. Some encoders achieving the constructed upper bounds are also presented.