Invention Grant
US08718205B1 Hard and soft bit demapping for QAM non-square constellations 有权
QAM非正方形星座的硬和软位解映射

Hard and soft bit demapping for QAM non-square constellations
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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