Manner of the radio signal processing in micro electrolysis cell communicating station and micro electrolysis cell communicating station, the micro cellular communication system, and cellular communication base station

摘要

A microcellular station ( 107) is a transceiving unit covering a relatively small geographic area and adapted to establish bidirectional links between mobile telephone subscriber stations and a main base station (100). Each such microcellular station includes a transmitter (201) for generating outgoing signals directed to the main base station over an optical fiber link. Radio signals received from a mobile station at a separate diversity antenna (116) of the microcellular station (107) are frequency shifted (205,206) and combined (209) with other signals received from the mobile station. The transmitter at the microcellular station generates an optical carrier signal which is modulated by the resulting combined signals. A frequency converter, located at the main base station, restores the frequency band of signals received from the microcellular station to its original frequency. Frequency shifting and conversion are implemented at the microcellular station and at the main base station by frequency mixing steps performed by oscillators at both locations, which oscillators use the same reference frequency thereby achieving channel coherency. IMAGE