Abstract: [Problem] A distance between one device and another device can be calculated without taking delay time on the other device into consideration by calculating an average value of propagation time between the two devices through bidirectional communication performed therebetween.

Abstract: Provided is a communication system in which one transmission path is shared by a plurality of communication devices, wherein the plurality of communication devices each includes a transmitter that repeatedly transmits one packet to the transmission path with a period of the communication device until a prescribed condition is satisfied, and a receiver that integrates a signal on the transmission path over a period of another communication device until a prescribed condition is satisfied.

Abstract: The invention is concerning a proxy payment system including a user device, a physical store device provided in a physical store, an intermediary device provided in the physical store to communicate with the user device and the physical store device, and a proxy payment device provided on a network to make a payment to the physical store device on behalf of the user device in response to a request sent from the intermediary device over the network.

Abstract: Provided is a non-contact communication apparatus which uses a conventional IC chip without any change, while eliminating the need to transmit power to the IC chip and allowing an increase in communication range. A non-contact communication apparatus connectable to an IC chip includes an antenna section, a first detection section that retrieves a first detection signal from a signal received by the antenna section, an amplitude modulating section that amplitude-modulates a clock signal using the first detection signal retrieved by the first detection section and that inputs the amplitude-modulated signal to the IC chip, a second detection section that retrieves a second detection signal from an output signal from the IC chip, a load modulating section that load-modulates a carrier retrieved from the antenna section using the second detection signal retrieved by the second detection section and that inputs the load-modulated carrier to the antenna section, and a power supply section.

Abstract: Provided is a communication system in which one transmission path is shared by a plurality of communication devices, wherein the plurality of communication devices each includes a transmitter that repeatedly transmits one packet to the transmission path with a period of the communication device until a prescribed condition is satisfied, and a receiver that integrates a signal on the transmission path over a period of another communication device until a prescribed condition is satisfied.

Abstract: Provided is a non-contact communication apparatus which uses a conventional IC chip without any change, while eliminating the need to transmit power to the IC chip and allowing an increase in communication range. A non-contact communication apparatus connectable to an IC chip includes an antenna section, a first detection section that retrieves a first detection signal from a signal received by the antenna section, an amplitude modulating section that amplitude-modulates a clock signal using the first detection signal retrieved by the first detection section and that inputs the amplitude-modulated signal to the IC chip, a second detection section that retrieves a second detection signal from an output signal from the IC chip, a load modulating section that load-modulates a carrier retrieved from the antenna section using the second detection signal retrieved by the second detection section and that inputs the load-modulated carrier to the antenna section, and a power supply section.

Abstract: A radio communication system whereby a range is enabled and communication control and quality can be ideally maintained even if the communication distance changes. The transmitting apparatus has a transmitting unit that repeatedly transmits one data packet; a receiving unit that repeatedly receives a response packet; an integrating unit that integrates a repeatedly received response packet; and a determining unit that determines, by use of a result of the integration, whether the received response packet is correct. The receiving apparatus has a receiving unit that repeatedly receives a data packet; an integrating unit that integrates a repeatedly received data packet; a determining unit that determines, by use of a result of the integration, whether the received data packet is correct; and a transmitting unit that repeatedly transmits the response packet when determination is made that the received data packet is correct.

Abstract: A transaction system, comprising: a user apparatus; and a transaction support apparatus, the user apparatus and the transaction support apparatus being connected via a network; and a transaction apparatus connected to the user apparatus via short-rang radio communication, wherein upon receiving a request for transmission of electronic money from the transaction apparatus, the user apparatus is configured to transfer the received request for transmission to the transaction support apparatus; and upon receiving electronic money from the transaction support apparatus, the user apparatus is further configured to transfer the received electronic money to the transaction apparatus, and wherein the transaction support apparatus is configured to store electronic money, and when the request for transmission of electronic money is transferred from the user apparatus to the transaction support apparatus, the transaction support apparatus is configured to transmit the stored electronic money to the user apparatus in acco