| 摘要 |
The link quality between a calling station (200) and a called station (201) is tested by the calling station transmitting from a link quality analyzer signal generator (1) by a plurality of signal tones. The called station (201) has a link quality analyzer signal processor (5) which receives the plurality of transmitting tones and samples them. A power spectrum is obtained of the received tones. From the statistics of the power spectrum the parameters of signal-to-noise ratio, multipath delay spread, Doppler frequency spread, frequency offset statistics, frequency-amplitude correlation, average amplitude response versus frequency, signal fading statistics, harmonic and intermodulation distortions, RMS-to-mean signal ratio, noise profile, and various noise statistics are determined. The power spectrum of the plurality of tones is measured through the use of digital sampling techniques and digital fast Fourier transform techniques that are implemented through microprocessor-level technology, the signal processor including a micro-processor (57) controlling a fast Fourier transformer (47) and another microprocessor (63) controlling a microcomputer (43) which carries out analysis of the data provided by the fast Fourier transformer (47). |
