发明名称 |
Method and apparatus for computing soft decision input metrics to a turbo decoder |
摘要 |
A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature amplitude modulation (16QAM). In both implementations log-likelihood ratio (LLR) metrics on code symbols are estimated as products of various constant values and various combinations of the in-phase and quadrature components of a demodulated soft decision. In the implementation associated with the 16QAM modulation scheme, an estimate of the carrier-signal-to-interference (C/I) ratio is also used to estimate some of the LLR metrics. Estimates of the LLR metrics may also be obtained in association with generalized square QAM and M-ary PSK modulation schemes including, e.g., 64QAM, 256QAM, and 16PSK.
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申请公布号 |
US7583744(B2) |
申请公布日期 |
2009.09.01 |
申请号 |
US20070671459 |
申请日期 |
2007.02.05 |
申请人 |
SINDHUSHAYANA NAGABHUSHANA |
发明人 |
SINDHUSHAYANA NAGABHUSHANA |
分类号 |
H04L5/12;H03M13/27;H03M13/29;H03M13/45;H04L1/00;H04L27/00;H04L27/22;H04L27/38 |
主分类号 |
H04L5/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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