Base station transmission-reception apparatus for cellular system

Claim 2

A base station transmission-reception apparatus as claimed in claim 1, wherein each of said baseband signal processing sections includes: a monitor signal selection circuit (206) for selecting one reception signal from said collective modulation-demodulation sections and outputting the selected reception signal as a monitoring reception signal; and a reception quality monitoring section (205) for monitoring the reception quality of the monitoring reception signal from said monitor signal selection circuit and supplying a monitor signal to said control section; said control section (207) providing a selection signal for selecting a sector of the best reception quality to said transmission signal selection signal and said reception signal selection circuit in response to the monitor signal.

Claim 3

A base station transmission-reception apparatus for a cellular system, comprising: M first and second sector antennae (107, 408) provided for individual sectors for performing diversity reception; M collective modulation-demodulation sections (2-1,...2-M) connected to said M first and second sector antennae; and N baseband signal processing sections (1-1,...1-N) provided in a number equal to the number of communication channels and connected to said M collective modulation-demodulation sections; each of said baseband signal processing sections including: a control section (207) for outputting a selection signal for controlling the transmission condition; a transmission signal processing section (201) for producing a transmission signal in the form of a digital signal in accordance with a modulation method from transmission date; a transmission signal selection circuit (202) for outputting the transmission signal from said transmission signal processing section to only one of said sector antennae which is indicated by the selection signal; a first reception signal selection circuit (204) for selecting and outputting a reception signal of a sector indicated by the selection signal from among M reception signals received by said first M sector antennae; a second reception signal selection circuit (508) for selecting and outputting a reception signal of a sector indicated by the selection signal from among M reception signals received by said second M sector antennae; and a reception signal processing section (203) for performing diversity reception from the reception signals from the first and second M reception signal selection circuits to detect reception data corresponding to its own communication channel; and each of said collective modulation-demodulation sections including: transmission processing means (301-305) for converting transmission signals from the transmission signal selection circuits into a transmission radio signal in the form of an analog signal and supplying the resulted signal to said sector antennae; frequency conversion means (306, 608) for converting reception radio signals of a bandwidth corresponding to the N communication channels received by said sector antennae collectively into a baseband signal by frequency conversion; and analog-to-digital converter means (307, 609) for converting the base band signals (analog) from said frequency conversion means into digital signals and supplying the digital signals to the reception signal selection circuits.

Claim 4

A base station transmission-reception apparatus as claimed in claim 3, wherein each of said baseband signal processing sections includes: a monitor signal selection circuit (206) for selecting one reception signal from said collective modulation-demodulation sections and outputting the selected reception signal as a monitoring reception signal; and a reception quality monitoring section (205) for monitoring the reception quality of the monitoring reception signal from said monitor signal selection circuit and supplying a monitor signal to said control section; said control section (207) providing a selection signal for selecting a sector of the best reception quality to said transmission signal selection signal and said reception signal selection circuit in response to the monitor signal.