摘要:
A radio communication apparatus includes: a receiving unit configured to receive a cognitive signal including system information of each of a plurality of systems; a metric unit configured to prepare metric information indicating relationship degree between the radio communication apparatus and a communication system to which the radio communication apparatus does not belong; a condition determination unit configured to determine whether a restriction should be imposed on transmission by the radio communication apparatus based on the system information and the metric information; and a transmission unit configured to transmit a signal using predetermined radio resources when transmission by the radio communication apparatus is not prohibited.
摘要:
A radio frequency selection device in a radio communication system in which a radio communication channel is established between a mobile station and a base station by allocating a radio communication frequency band different from other radio communication system frequency bands is disclosed. The radio frequency selection device comprises: a frequency band determining unit that determines a radio control channel frequency band for transmitting control information, among frequency bands allocated to the radio communication system, based on the allocated radio communication channel frequency band; and a radio control channel establishing unit that establishes a radio control channel among the determined radio control channel frequency bands.
摘要:
To improve the channel capacity of an entire communication system in accordance with transmission quality of the channels of each node. A relay node has: a receiving section that receives a received signal from a source node; a channel estimation section that measures SNR of a backward channel between the source node and the relay node, and SNR of a forward channel between the relay node and a destination node; a relay selecting section that selects, from among a QR-P-ZF method, a QR-P-QR method and a ZF-P-QR method, a relay method of the relay node in accordance with the ratio between the SNRs of the backward and forward channels; a relay signal processing section that multiplies the received signal by a transmission weight matrix corresponding to the selected relay method, and thereby converts the received signal to a relay signal; and a transmitting section that transmits the relay signal to the destination node.
摘要:
The present invention provides a compound represented by formula (I): wherein n is an integer selected from 1 to 20, Q is A is cyano or the like; B is hydrogen, halogen, or the like; X1 and X2 are each independently selected from O and S; E is a C1-4 alkyl group; and R1, R2, R3 and R4 are each independently selected from a hydrogen atom and a C1-C6 alkyl group, and a drug, a pharmaceutical composition containing the compound, and the like.
摘要:
A radio communication apparatus for performing transmission and reception of radio communications simultaneously by using different carrier frequencies for transmission and reception, comprising: a transceiver having a coupling loop interference signal removal function for analog domain and/or a coupling loop interference signal removal function for digital domain, for removing a coupling loop interference signal contained in a signal; and a power suppressor for coupling loop interference signal for attenuating the signal power in order to suppress the coupling loop interference signal power that is contained in the signal.
摘要:
A communication device used in a first communication system under a frequency sharing environment where the first communication system and a second communication system establish communications within the same frequency band is disclosed. The communication device comprises a detector for detecting an interfering signal from the second communication system; and a determiner for determining transfer characteristics of a shaping filter according to a result of the detection, the shaping filter being used for a desired signal of the first communication system.
摘要:
A wireless communication system is disclosed that transmits a feedback signal containing a channel estimate value between a first wireless communication device and a second wireless communication device. The first wireless communication device that transmits the feedback signals includes: a channel estimation unit that receives signals containing pilot signals, and determines the channel estimate value of a wireless link; a multiplier that multiplies a pilot signal by the channel estimate value; and a multiplexer that multiplexes an output signal from the multiplier with another pilot signal, to generate the feedback signal. The second wireless communication device that receives the feedback signal includes: a separator that separates the signals that are multiplexed in the feedback signal; and channel estimation units that determine the channel estimate value of the wireless link, based on the separated signals.
摘要:
A controller in a transceiver for radio communications in which the same frequency is shared between multiple communications systems is disclosed that includes: a cyclic autocorrelation value calculation part configured to calculate the cyclic autocorrelation value of a first one of the communications systems from a received signal; and a data transmission authorization part configured to determine whether to authorize data transmission in a second one of the communications systems based on the calculated cyclic autocorrelation value of the first one of the communications systems.
摘要:
A disclosed base station is used in a first wireless communication system using a first frequency band that is the same as or adjacent to a second frequency band used by a second wireless communication system, and includes a propagation loss estimation unit configured to estimate propagation loss of a signal in the first frequency band when the signal arrives at a receiving device of the second wireless communication system; a frequency difference calculation unit configured to calculate a frequency difference between the first frequency band and the second frequency band; a maximum transmission power determining unit configured to determine maximum transmission power based on the estimated propagation loss and the calculated frequency difference; and a transmission control unit configured to transmit a signal with transmission power less than or equal to the maximum transmission power determined by the maximum transmission power determining unit.
摘要:
The present invention has an object of providing a transmitter apparatus, a mobile communication system, a base station and a communication enable signal transmitter unit, which can prioritize communications of a mobile station in a priority communication system over communications of a mobile station in a non-priority communication system, in a network where the priority communication system and the non-priority communication system coexist in the same communication area.The non-priority communication transmitter apparatuses 10B and 30B comprise signal transmitter units 16 and 17 configured to be enabled to transmit, to the non-priority communication receiver apparatuses 10B and 30B, a signal by using a frequency channel of a second frequency band, when the non-priority communication transmitter apparatuses 10B and 30B receive a communication enable signal from a priority communication system or when the non-priority communication transmitter apparatuses 10B and 30B detect that the non-priority communication transmitter apparatuses 10B and 30B has received the communication enable signal.