Diversity receiving device and diversity receiving method

摘要

A diversity receiving device includes receiving circuits, a diversity combining unit, and an oscillation controller. The receiving circuit performs frequency conversion of an analog received signal obtained at a first receiving system, by using a plurality of lower-side oscillation-frequency signals supplied from a first local oscillator, to generate a plurality of lower-side low-frequency signals, adds up the plurality of lower-side low-frequency signals to generate a first addition signal. The receiving circuit performs frequency conversion of an analog received signal obtained at a second receiving system, by using a plurality of higher-side oscillation-frequency signals supplied from a second local oscillator, to generate a plurality of higher-side low-frequency signals, and adds up the plurality of higher-side low-frequency signals to generate a second addition signal. The oscillation controller controls lower-side oscillation-frequencies so that frequency bands of the plurality of lower-side low-frequency signals become adjacent to one another and controls higher-side oscillation-frequencies so that frequency bands of the plurality of higher-side low-frequency signals become adjacent to one another.

主权项

1. A diversity receiving device for receiving, at a first receiving system and a second receiving system, a transmission signal containing first to K-th high-frequency-channel components having mutually different first to K-th central frequencies respectively, K being an integer not less than 2, the diversity receiving device comprising:
a first receiving circuit that receives, as an input, a first received signal obtained at the first receiving system; a second receiving circuit that receives, as an input, a second received signal obtained at the second receiving system; a diversity combining unit that combines an output of the first receiving circuit and an output of the second receiving circuit for each same frequency component; and an oscillation controller; the first receiving circuit including: a first local oscillator that supplies first to K-th lower-side oscillation-frequency signals having first to K-th lower-side oscillation-frequencies respectively, the first to K-th lower-side oscillation-frequencies being shifted toward lower frequency sides of the first to K-th central frequencies respectively; a first frequency converter that performs frequency conversion of the first received signal by using the first to K-th lower-side oscillation-frequency signals, thereby generating first to K-th lower-side low-frequency signals corresponding to the first to K-th lower-side oscillation-frequencies respectively; a first signal adder that adds up the first to K-th lower-side low-frequency signals, thereby generating a first addition signal; a first channel-component extractor that extracts, from the first addition signal, first to K-th lower-side low-frequency-channel components corresponding to the first to K-th high-frequency-channel components respectively; and a first channel signal processor that performs signal processing of the first to K-th lower-side low-frequency-channel components, thereby generating first to K-th lower-side low-frequency-channel processing signals corresponding to the first to K-th lower-side low-frequency-channel components respectively to output the first to K-th lower-side low-frequency-channel processing signals to the diversity combining unit; the second receiving circuit including: a second local oscillator that supplies first to K-th higher-side oscillation-frequency signals having first to K-th higher-side oscillation-frequencies respectively, the first to K-th higher-side oscillation-frequencies being shifted toward higher frequency sides of the first to K-th central frequencies respectively; a second frequency converter that performs frequency conversion of the second received signal by using the first to K-th higher-side oscillation-frequency signals, thereby generating first to K-th higher-side low-frequency signals corresponding to the first to K-th higher-side oscillation-frequencies respectively; a second signal adder that adds up the first to K-th higher-side low-frequency signals, thereby generating a second addition signal; a second channel-component extractor that extracts, from the second addition signal, first to K-th higher-side low-frequency-channel components corresponding to the first to K-th high-frequency-channel components respectively; and a second channel signal processor that performs signal processing of the first to K-th higher-side low-frequency-channel components, thereby generating first to K-th higher-side low-frequency-channel processing signals corresponding to the first to K-th higher-side low-frequency-channel components respectively, and outputs the first to K-th higher-side low-frequency-channel processing signals to the diversity combining unit; the oscillation controller controlling the first to K-th lower-side oscillation-frequencies so that frequency bands of the first to K-th lower-side low-frequency signals become adjacent to one another and controlling the first to K-th higher-side oscillation-frequencies so that frequency bands of the first to K-th higher-side low-frequency signals become adjacent to one another.