TY  - JOUR
T1  - Data width requirements in SISO decoding with module normalization.
JF  - IEEE Transactions on communications
A1  - Yufei Wu
LA  - English
UL  - https://tuklas.up.edu.ph/Record/UP-99796217609484037
AB  - This letter studies the numerical properties of log-MAP-based soft-input soft-output decoding. The ranges of the differences between the path metrics, the soft output, and the complete information are derived. Since the log-MAP algorithm is functionally dependent only upon the differences between path metrics, not their magnitudes, a module normalization technique that is automatically implemented in two's complement arithmetic can be used to accommodate overflow of the path metrics. An expression for the minimum internal data width of a soft-input soft-output decoder that employs the module normalization technique is derived. As an application, the minimum internal data width of a decoder for the turbo code used in third-generation mobile communication systems is determined
KW  - 3G mobile communication systems.
KW  - SISO decoding.
KW  - Data width requirements.
KW  - Fixed point decoder.
KW  - Log-MAP-based soft-input soft-output decoding.
KW  - Minimum internal data width.
KW  - Module normalization.
KW  - Path metrics.
KW  - Third-generation mobile communication.
KW  - Turbo code.
ER  -