Abstract: The present disclosure provides a radio communication apparatus, a radio communication system, a radio communication method, and a program capable of demodulating signals at appropriate reception timings. A radio communication apparatus 11 includes: a measurement unit 111 configured to measure delay profiles of a plurality of frequency bands; and a determination unit 112 configured to determine a path timing of a first frequency band f1 based on a time difference between a first time tm1 indicating a time of a maximum amplitude in the first frequency band f1 of the plurality of frequency bands and a second time tm2 indicating a time of a maximum amplitude in a second frequency band f2 of the plurality of frequency bands.

Abstract: The present disclosure provides a radio communication apparatus, a radio communication system, a radio communication method, and a program capable of demodulating signals at appropriate reception timings. A radio communication apparatus 11 includes: a measurement unit 111 configured to measure delay profiles of a plurality of frequency bands; and a determination unit 112 configured to determine a path timing of a first frequency band f1 based on a time difference between a first time tm1 indicating a time of a maximum amplitude in the first frequency band f1 of the plurality of frequency bands and a second time tm2 indicating a time of a maximum amplitude in a second frequency band f2 of the plurality of frequency bands.

Abstract: A method for improving the accuracy of synchronization between base stations even when the propagation path condition between the base stations is poor or when noises are large is provided. A base station (100) according to the present invention includes a communication unit (10) configured to receive a first reference signal transmitted from a first base station (101) and a second reference signal transmitted from a communication device (102) different from the first base station (101), and an execution unit (20) configured to obtain synchronization between the base station (100) and the first base station (101) based on the first and second reference signals.

Abstract: It is desired to provide a receiving apparatus in a wireless communication system and a channel estimation control method that are capable of reducing delay in channel estimation and the error rate in decoding channel information. To achieve this, in a wireless communication system using a first reference signal, with which a control information signal is not multiplexed, and a second reference signal, with which a control information signal is multiplexed, a receiver (200) includes: an A/N detection selection unit (211) that selects whether to use both the first reference signal and the second reference signal for channel estimation or to use only the first reference signal for channel estimation; and a channel estimation unit (209) that carries out channel estimation by use of the selected reference signal(s).

Abstract: A method for improving the accuracy of synchronization between base stations even when the propagation path condition between the base stations is poor or when noises are large is provided. A base station (100) according to the present invention includes a communication unit (10) configured to receive a first reference signal transmitted from a first base station (101) and a second reference signal transmitted from a communication device (102) different from the first base station (101), and an execution unit (20) configured to obtain synchronization between the base station (100) and the first base station (101) based on the first and second reference signals.

Abstract: It is desired to provide a receiving apparatus in a wireless communication system and a channel estimation control method that are capable of reducing delay in channel estimation and the error rate in decoding channel information. To achieve this, in a wireless communication system using a first reference signal, with which a control information signal is not multiplexed, and a second reference signal, with which a control information signal is multiplexed, a receiver (200) includes: an A/N detection selection unit (211) that selects whether to use both the first reference signal and the second reference signal for channel estimation or to use only the first reference signal for channel estimation; and a channel estimation unit (209) that carries out channel estimation by use of the selected reference signal(s).

Abstract: To achieve a wireless communication apparatus capable of lowering power consumption for a digital signal processing of a transmitter in response to a transmission path condition. A wireless communication system performs communication by digital transmission or analog transmission of a signal processed by a digital signal processing unit in a transmitting section on a transmission side toward a reception side through a line, wherein a transmission path condition of the line is measured on the reception side, the transmission path condition is transmitted to the transmission side using a reverse line with respect to the above described line, and a bit width for signal processing of digital signal processing units such as a modulating unit and a digital/analog converting unit is varied by a bit width selecting unit in response to the transmission path condition of the line notified by the reverse line on the transmission side.