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This paper introduces an MSK non-coherent demodulation algorithm that integrates the soft spreading spectrum of CCSK, addressing the issue of signal demodulation in noisy environments. MSK modulation is widely used due to its efficient spec-tral utilization and low bit error rate, but traditional coherent demodulation relies on accurate carrier phase information, which is not suitable for short-burst communication and high-dynamic environments. The algorithm combines CCSK spreading technology, using base functions with strong periodic auto-correlation characteristics and their cyclic shift sequences, and proposes a waveform-matching-based MSK non-coherent demodulation algorithm, which significantly enhances the anti-interference capability, simplifies the receiver design, and maintains good demodulation performance under low signal-to-noise ratio conditions, with a high degree of tolerance to the sampling point drift. The simulation results show that under a signal-to-noise ratio of -5.5 dB, the system's bit error rate (BER) can be kept below 10-6, demonstrating excellent noise resistance. Additionally, simulation experiments analyzed the im-pact of sampling point drift, revealing that a 1-sample point drift can cause 2-3 dB decrease in demodulation performance, while a 2-sample point drift can contribute to a 5-6 dB decrease, yet the demodulation performance remains within an operational range. The algorithm demonstrates outstanding demodulation performance under low signal-to-noise ratios and in high-dynamic scenarios. In conclusion, the waveform-matching-based MSK non-coherent demodulation algorithm proposed in this paper offers an efficient and reliable solution for wireless communication in complex environments.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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