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Turbo-codes and Turbo-coded Modulation in Cdma Mobile Radio Systems for Short Frame Transmission
| Content Provider | Semantic Scholar |
|---|---|
| Author | Uhn, Volker K. |
| Abstract | | Recently, 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 very large interleavers prohibiting an application in 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. Furthermore, the performance of a turbo-coded modulation scheme is investigated with respect to the typical conditions of DS-CDMA systems. As a result, it is shown that Turbo-Codes are no longer superior to classical convolutional codes if the same decoding costs are assumed. Additionally, 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 for allowing of high coding gains. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.comm.uni-bremen.de/pub/cdma/ISSSTA98.ps.gz |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Assumed Bit error rate Channel state information Code (cryptography) Code rate Concatenation Convolutional code Forward error correction Modulation Noisy-channel coding theorem Recursion Simulation Surgical Replantation Turbo code X.690 Ziziphus mauritiana |
| Content Type | Text |
| Resource Type | Article |
