| 摘要 |
Transmission-efficient digital signaling methods, provided by modulation and subsequent detection of multi-dimensional, non-orthogonal signal basis sets (V (t), V (t), V (t), V (t)), are disclosed herein. In accordance with the invention, Quadrature Minimum-Shift Keyed (QMSK), M-are Quadrature Minimum-Shifted Keyed (M-QMSK), and constant-envelope QMSK (CE) signaling methods are provided for carrier-based transmission. In additional accordance with the invention, a baseband QMSK (BB) signaling method, suitable for conductive transmission, is provided. Bandwidth efficiency and power efficiency (Fig. 20 and Fig. 21) are dramatically improved by the signaling methods of the present invention. For example, band-limited QMSK signaling yields 100 % improvement in bandwidth efficiency in comparison to band-limited QPSK or MSK while retaining esentially antipodal power efficiency. For identical data rates, M-QMSK signaling provides significant bandwidth efficiency and power efficiency improvements in comparison to M-QAM. In still additional accordance with the invention, power-efficient signal detection for the non-orthogonal signals disclosed herein is provided by a non-conventional, augmented correlating demodulator (Fig. 17).
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