Invention Grant
- Patent Title: Hard and soft bit demapping for QAM non-square constellations
- Patent Title (中): QAM非正方形星座的硬和软位解映射
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Application No.: US13935083Application Date: 2013-07-03
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Publication No.: US08718205B1Publication Date: 2014-05-06
- Inventor: Douglas Howard Morais
- Applicant: Douglas Howard Morais
- Main IPC: H04L27/06
- IPC: H04L27/06 ; H04L5/12 ; H04W4/00

Abstract:
Low complexity methods for hard and soft bit level demapping in a receiver of QAM signals with non-square, Gray coded constellations created as per U.S. Pat. No. 8,422,579 B1. In these methods the received signal is equalized to remove channel distortion, demodulated into in-phase and quadrature phase related symbols, and these symbols converted into hard-bits or preliminary soft-bits bits via the application of bit decision rules. Further, if converted into preliminary soft-bits, they may be multiplied by a factor to account for the impact of the received signal's signal-to-noise ratio on bit reliability, thereby creating final-soft-bits.
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