Title:
CN RATIO MEASUREMENT MEANS
Document Type and Number:
Japanese Patent JP3237322
Kind Code:
B2
Abstract:
PURPOSE: To measure the C/N before demodulation from a reception signal even when there is no non-modulation part or even from a signal subjected to quasi-synchronization detection.
CONSTITUTION: An in-phase orthogonal component of a burst signal detected and phase-modulated by an orthogonal detector 3 is sampled and quantized by a A/D converter 4, a filter 5 is used to make waveform shaping and the signal is stored by one burst in a buffer memory 6. An XY-R2 converter 7 calculates square of the amplitude of the signals outputted from the buffer memory 6 and a selector 8 selects the value to which accumulator it is to be received. A noise power calculation section 10 uses plural accumulated sums outputted from an accumulation section 9 to obtain noise power of the reception signal and a C/N calculation section 11 estimates the C/N from the accumulation outputted from the accumulation section 9 and the noise power outputted from the noise power calculation section 10 and the estimated C/N by the C/N calculation section 11 is outputted from an output terminal 12.
Inventors:
Yasushi Sokabe
Application Number:
JP17679793A
Publication Date:
December 10, 2001
Filing Date:
July 16, 1993
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H04J11/00; H04L27/18; (IPC1-7): H04L27/18
Domestic Patent References:
| JP5413729A |
Attorney, Agent or Firm:
Kaneo Miyata (1 person outside)
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