Binary CPFSK Modulation and Demodulation Using Non-Square-Root Raised Cosine Shaping Filter

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Resource Overview

Binary CPFSK modulation and demodulation employing non-square-root raised cosine shaping filter, with demodulation achieved through 8x oversampled final-point detection method.

Detailed Documentation

In the modulation and demodulation process of binary Continuous Phase Frequency Shift Keying (CPFSK), a highly effective non-square-root raised cosine shaping filter is employed for modulation to ensure optimal spectral efficiency and noise immunity. The implementation typically involves using shaping coefficients calculated without the square root operation, which simplifies the filter design while maintaining smooth phase transitions. For demodulation, an 8x oversampled final-point detection method is utilized, where the receiver samples the incoming signal at eight times the symbol rate and extracts the decision metric from the final sample of each symbol period. This approach enhances demodulation accuracy and reliability by providing better timing synchronization and reduced intersymbol interference. The algorithm can be implemented using matched filtering followed by peak detection at the optimal sampling instants.

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