| 摘要 |
PROBLEM TO BE SOLVED: To provide an estimation system for complex gain of transmission channel designed for a modulator/demodulator arranged parallel to be used for digital radio broadcasting. SOLUTION: This estimation system is provided with prescribed N sets of interpolating devices 1n for estimating the gain of an effective symbol among known symbols constituting a gain reference equally arranged in a signal to be transmitted, each of interpolating devices 1n is made suitable for the special state of a received signal and enables coverage from a single stable speech channel to the channel of large time distribution and high unstability to a selector 2, and this said interpolating devices 1n are connected to a selector 2, and this selector 2 is programmed so as to select the set of interpolating devices 1b to output a minimum estimation noise during a specified time. The field of application is digital radio transmission. |
