| 摘要 |
<p>The intervals (120, 125) between the spectra (111, 112, 113) of carrier waves are greater than or around the coherent bandwidth, and hence the carrier waves can receive mutual correlative phasing. Therefore, even if the spectrum (112) receives phasing by a specific carrier wave during call and consequently the line quality degrades, the call can be continued by the other spectra (111, 113). In this case, the other received signals are synchronously detected and combined by a maximum ratio composite method, and carriers can be regarded as independent of each other. Therefore, diversity reception by a maximum ratio composite method of branches, the number of which is equal to the number of carriers used for communcation, is possible. Since the intervals between the frequencies are so set by using existing circuit techniques that the carriers are almost mutually in correlation, no radio circuit having frequency characteristics of wide band nor processor for high-degree digital signal processing is needed.</p> |
