Turbo-Codes and Turbo-Coded Modulation in CDMA Mobile Radio Systems for Short Frame Transmission

Autor: V. Kühn
Kurzfassung: For the last four years, binary parallel concatenated recursive convolutional codes termed Turbo-Codes received great attention due to their amazing error correcting capabilities. Nevertheless, reaching near Shannon limit performance is only possible with a very large interleaver size preventing an application for speech-transmission. This paper presents simulation results for a short-frame data transmission system based on DS-CDMA (Direct-Sequence Code Division Multiple Access) employing Turbo-Codes. As a result, it is shown that Turbo-Codes are no longer superior to classical convolutional codes if the same decoding costs are assumed. Furthermore, simulation results illustrate that coded modulation schemes are not well suited for the application in CDMA systems. Finally, it is proved that an accurate channel estimation is necessary to take advantage of high coding gains.
Dokumenttyp: Konferenzbeitrag
Veröffentlichung: Sun City, South Africa, 2. - 4. September 1998
Konferenz: IEEE International Symposium on Spread Spectrum Techniques & Applications (ISSSTA 98)
Seiten: 364-368
Volume: 2
Index: 75
ISSSTA_1998_kühn.pdf245 KBISSSTA_1998_kühn.ps.gz115 KB
Zuletzt aktualisiert am 25.04.2008 von Admin
AIT ieee GOC tzi ith Fachbereich 1
© Arbeitsbereich Nachrichtentechnik - Universität BremenImpressum / Kontakt