Invention Grant
- Patent Title: Bit log likelihood ratio evaluation
- Patent Title (中): 位对数似然比评估
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Application No.: US11330652Application Date: 2006-01-11
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Publication No.: US07660368B2Publication Date: 2010-02-09
- Inventor: Fuyun Ling , Seong Taek Chung , Jinxia Bai , Thomas Sun
- Applicant: Fuyun Ling , Seong Taek Chung , Jinxia Bai , Thomas Sun
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agent Gerald P. Joyce, III
- Main IPC: H03D3/22
- IPC: H03D3/22
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 k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy 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, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.
Public/Granted literature
- US20060178755A1 Bit log likelihood ratio evaluation Public/Granted day:2006-08-10
Information query
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