A proposal of short time DFT syllabic compander and its configurations

Effective utilization of the radio frequency resources is eager to be promised in narrowing spectrum occupancy bandwidth or saving transmission power. Unfortunately, the more efficient in narrowing bandwidth of angular modulation signals the merit of low -noise loses worse in wide -band amplgiers, or the more effective in saving transmission power speech quality is the worse suffered from such noises as thermal and fading. The noise reduction facility of implementing compander or diversity receiving becomes to be inevitable in the narrow band communication systems for preventing frequency resources from exhausting. The short time DFT compander achieves companding on the frequency domain with employing the concept of instantaneous spectrum without detecting the input signal envelopes. Where input signals are analyzed into instantaneous spectrum through the short time DFT, companding is performed via such operations a s multiplying or dividing these components of instantaneous spectrum without giving any phase deviation to the vector of the spectrum. The olltput signal is, therefore, realized with synthesizing from the companded instantaneous spectrums. Noise reduction, which is one of the most important function of the compander, is examined to be sufficient for cellular telephone systems through baseband fading simulation system over 900 MHz channel of existing cellular systems.

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Optimized configuration of the short time DFT compander and its noise reduction effect

Kishi

Iwata

[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology

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A design of digital syllabic compander using the mean absolute estimator

Kim

Rho

Park

IEEE 43rd Vehicular Technology Conference

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Envelope detection in strict sense and its application to syllabic companders

Kishi

Proceedings of IEEE Vehicular Technology Conference (VTC)

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A proposal of short time DFT syllabic compander and its configurations

Cited by 3 publications

References 2 publications

Optimized configuration of the short time DFT compander and its noise reduction effect

Optimized configuration of the short time DFT compander and its noise reduction effect

A design of digital syllabic compander using the mean absolute estimator

Envelope detection in strict sense and its application to syllabic companders

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