Design of coded CPFSK modulation systems for bandwidth and energy efficiency
作者： B. Rimoldi
DOI: 10.1109/26.35369
关键词:
摘要: Consideration is given to the problems related design of M-ary continuous-phase frequency-shift keying (CPFSK) systems with modulation index h=J/M, combined eternal rate r binary convolution encoders. The following questions are raised and answered: (1) how should different encoder-modulator be compared can comparable recognized from system parameters, i.e. M, h, r?; (2) what limits on information per unit bandwidth, versus signal-to-noise ratio, when reliable transmission required?; (3) does one choose parameters overall has achieve a specified performance?; (4) external convolutional encoder put in front CPFSK h=J/M? A simple approximation for bandwidth signal shown sufficiently accurate purposes. carried out novel way that leads fewer states thus yields improved performance demodulation-decoding complexity previous approaches coded systems. >
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