Abstract: A frequency multiplex transmission device configured to transmit and receive a frequency multiplex signal having a plurality of subcarriers, the frequency multiplex transmission device comprising: a transmitter configured to transmit the frequency multiplex signal by using a plurality of modulation methods; a receiver configured to receive a signal state to the frequency multiplex signal from an opposite station; and a controller configured to obtain a signal state to each of the subcarriers on the basis of the received signal state and a frequency characteristic of an antenna included in the transmitter, the controller being configured to control transmission on the basis of an obtained result.

Abstract: A radio frequency repeater equipment in a radio communication system is disclosed. An indoor space exists under a radio base station of the radio communication system, and a mobile terminal in the indoor space performs radio communications with the radio base station via the radio frequency repeater equipment, the radio frequency repeater equipment includes: a first antenna for receiving a DOWN LINK signal from the radio base station; a first attenuator for attenuating an output of the first antenna; a second antenna for outputting an output of the first attenuator, and for receiving a signal from the mobile terminal; and a second attenuator for attenuating an output of the second antenna.

Abstract: A frequency multiplex transmission device configured to transmit and receive a frequency multiplex signal having a plurality of subcarriers, the frequency multiplex transmission device comprising: a transmitter configured to transmit the frequency multiplex signal by using a plurality of modulation methods; a receiver configured to receive a signal state to the frequency multiplex signal from an opposite station; and a controller configured to obtain a signal state to each of the subcarriers on the basis of the received signal state and a frequency characteristic of an antenna included in the transmitter, the controller being configured to control transmission on the basis of an obtained result.

Abstract: In a code division multiplexing communication system capable of utilizing a plurality of frequencies, a monitoring section 1 of a base station control apparatus monitors, for each frequency, the number of calls for each call type to which a frequency is allocated; an allocation section 2 allocates, when a new call occurs, a frequency among all the frequencies to the call such that unevenness in the distribution for each call types among frequencies does not occur; and a notification section 3 notifies a terminal through a base station 4, when the frequency differing from an awaiting frequency of the terminal is allocated to the call, of the frequency as a new awaiting frequency.

Abstract: A signal transmission system for transmitting an UP LINK signal received by an antenna shared by at least a first radio communication system and a second radio communication system to at least a radio base station of the first radio communication system is provided. In the signal transmission system, the first radio communication system is affected by a spurious signal of a radio communication system other than the first radio communication system, and the signal transmission system includes: a determination part for determining whether a signal level of a signal, included in the UP LINK signal, from at least the second radio communication system exceeds a permissible level; and a level adjustment part for adjusting a power level of the UP LINK signal so as to output an adjusted signal according to the determination result, and sending the adjusted signal to the radio base station.

Abstract: A radio frequency repeater equipment in a radio communication system is disclosed. An indoor space exists under a radio base station of the radio communication system, and a mobile terminal in the indoor space performs radio communications with the radio base station via the radio frequency repeater equipment, the radio frequency repeater equipment includes: a first antenna for receiving a DOWN LINK signal from the radio base station; a first attenuator for attenuating an output of the first antenna; a second antenna for outputting an output of the first attenuator, and for receiving a signal from the mobile terminal; and a second attenuator for attenuating an output of the second antenna.

Abstract: A signal transmission system including an antenna that is used for transmitting and receiving and that is connected, via a transmission cable, to a radio base station of a radio communication system operating under a TDD scheme is disclosed. The signal transmission system includes: a detection part for detecting a synchronization pattern that is included in a DOWN LINK signal received from the radio base station via the transmission cable; and a part for determining timing for switching between transmitting and receiving for the antenna on the bases of the detection result.

Abstract: In a code division multiplexing communication system capable of utilizing a plurality of frequencies, a monitoring section 1 of a base station control apparatus monitors, for each frequency, the number of calls for each call type to which a frequency is allocated; an allocation section 2 allocates, when a new call occurs, a frequency among all the frequencies to the call such that unevenness in the distribution for each call types among frequencies does not occur; and a notification section 3 notifies a terminal through a base station 4, when the frequency differing from an awaiting frequency of the terminal is allocated to the call, of the frequency as a new awaiting frequency.