Authors: |
A. Dekorsy, V. Kühn, K.-D. Kammeyer |
Abstract: |
Iterative decoding of a serial concatenated coding scheme consisting of an outer convolutional code and M-ary orthogonal Walsh modulation as inner Walsh-Hadamard block code in an OFDM-CDMA system is applied. New aspects arise because OFDM enables the iterative decoding structure to exploit time as well as frequency diversity of a mobile channel. Moreover, the paper points out the low complex symbol-by-symbol maximum a posteriori (SS-MAP) decoding of Walsh-Hadamard block codes. Besides the derivation of the log-likelihood-ratio used for SS-MAP Walsh-Hadamard decoding, simulation results are shown for a differently interleaved indoor channel. They confirm the iterative decoding property to benefit from selectivity in time as well as frequency direction.
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Document type: |
Conference Paper |
Publication: |
Hamburg, Germany, 21. - 22. September 1999 |
Conference: |
4th International OFDM-Workshop (InOWo 99) |
Index: |
84 |
Files: |
BibTEX
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