Bit log likelihood ratio evaluation

Details Bit log likelihood ratio evaluation Bit log likelihood ratio evaluation

2006-01-11

2010-02-09

Payne, David C (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C341S143000, C370S207000, C375S262000, C375S265000, C375S341000

Reexamination Certificate

active

07660368

ABSTRACT:
A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12or k22. The method selects a mismatched energy ratio (k2) between k12and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2is selected to be about 5.0625. Alternately stated, the mismatched k2energy ratio in selected by determining the approximate midpoint between k12and k22.

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