Modified branch metric calculator to reduce interleaver...

Details Modified branch metric calculator to reduce interleaver... Modified branch metric calculator to reduce interleaver...

2005-08-26

2008-12-09

Chaudry, Mujtaba K (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S794000

Reexamination Certificate

active

07464316

ABSTRACT:
A turbo decoder that calculates alpha, beta and gamma (branch metric) values does not normalize the branch metric but instead applies the normalization factor to the newly calculated extrinsic values before writing them to interleaving memory, resulting in use of less memory than in prior turbo decoders. A compensating factor is applied when the extrinsics are read from interleaving memory. The absence of normalization in the gamma calculation not only conserves memory but also enhances decoder sensitivity.

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Claussen et al.; “Improved Max-Log Map Turbo Decoding Using Maximum Mutual Information Combining”; The 14thIEEE 2003 International Symposium on Personal, Indoor and Mobile Radio Communication Proceedings.

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