摘要:
Even when communication is performed independently in each CC (Component Carrier), the occurrence of an error in communication is prevented. Provided is a wireless communication system in which a wireless transmission apparatus and a wireless reception apparatus communicate with each other using a plurality of system frequency bands, wherein the wireless transmission apparatus performs transmission power control on transmission data in each of the system frequency bands, and furthermore, a maximum transmission power which can be transmitted in each of the system frequency bands can be controlled so as to be different from each other. Priorities are set on each of the system frequency bands, and transmission powers of the system frequency bands are determined in descending order of the priorities.
摘要:
A frequency resource required for communication between an RS and an eNB is reduced. Provided is a radio relay method for relaying a radio signal exchanged between a mobile station and a base station. The radio relay method includes performing relaying such that a frequency to be used in a case of relaying at least one of transmission signals transmitted from a plurality of mobile stations is overlapped with and allocated to at least a part of a frequency to which another non-relayed transmission signal is allocated. The frequency to be used for transmitting the relayed transmission signal may be disposed discretely on a frequency axis.
摘要:
To reduce power consumption in a mobile station apparatus in uplink, while making the system more efficient, the mobile station apparatus has a plurality of transmission antennas 7, performs wireless communications with a base station apparatus, and is provided with a PDCCH reception part 2 that receives designation information for designating the number of transmission antennas to use from the base station apparatus, a PH calculation part 5 that calculates PH (Power Headroom) indicative of a difference between maximum transmission power and transmission power required to achieve desired reception power in the base station apparatus, and a PUSCH transmission part 6 that transmits a signal including the PH to the base station apparatus using the number of transmission antennas designated by the designation information.
摘要:
A mobile station apparatus includes a plurality of PAs (Power Amplifiers) and a plurality of antennas and transmission performances thereof is to be improved when transmission signals having peak powers different from one another are transmitted through the use of the respective antennas. A transmission apparatus includes a plurality of PAs and a plurality of antennas and transmits a signal having a high peak power, by means of determining a transmission signal to be transmitted through the use of each of the PAs based on the capability of each of the PAs, converting the transmission signal into a frequency signal by time-frequency conversion, dividing the frequency signal into a plurality of clusters, and allocating the clusters to bands non-contiguously. Furthermore, the transmission apparatus transmits a signal having a low peak power by means of allocating the frequency signal to continuous bands.
摘要:
To suppress deterioration of channel estimation accuracy even when a terminal moves at high speed in a system for switching among a plurality of insertion patterns of channel estimation signals, in a wireless communication system for using one of a plurality of types of frame formats with different insertion positions of a channel estimation symbol, and spreading data in the frequency domain to perform communications, the types of frame formats include at least a first frame format having a channel estimation symbol in which channel estimation signals are allocated to all subcarriers, and a second frame format having a channel estimation symbol in which a channel estimation signal and data is multiplexed, and PAPR characteristics of a subcarrier for data transmission in the second frame format are the same as PAPR characteristics of a subcarrier for transmitting a symbol assigned only the data.
摘要:
To improve performance of a decoder even in a system with the coder configuration determined by inserting a doping bit sequence known between a transmission apparatus and a reception apparatus in an information bit sequence to transmit, the transmission apparatus is a transmission apparatus that transmits radio signals to the reception apparatus, and is provided with a doping section 23 that inserts a doping bit sequence which is known between the transmission apparatus and the reception apparatus in an information bit sequence to transmit to the reception apparatus, coding sections 11a, 11b that performerror-correcting coding on a bit sequence with the doping bit sequence inserted therein, a puncturing section that performs puncturing on a bit sequence subjected to the error-correcting coding, and a wireless transmission section 24 that transmits a bit sequence subjected to the puncturing.
摘要:
To provide a radio communication system, a transmission apparatus, a central control unit, and a reception apparatus, which can enhance transmission performances without giving more interference than necessary. The radio communication system in which a plurality of transmission apparatuses 100 and 200 performs communication with a reception apparatus 300 in a coordinated manner determines a transmission method in the respective transmission apparatuses in accordance with a magnitude relation of an average reception power between the respective transmission apparatuses in the communication, and enhances the whole transmission performances. The radio communication system determines a transmission method in accordance with a magnitude relation of an average reception power. Since a significance of each channel differs depending on a magnitude of the average reception power, efficient transmission in accordance with the significance becomes possible. As the result, transmission performances can be enhanced.
摘要:
Even when respective transmitters use different transmission schemes, signals of the respective transmitters are separated. A receiver that is applied to a multiuser MIMO system in which a plurality of transmitters performs transmission to at least one receiver, includes a MIMO separation part 40 that receives signals transmitted in different transmission schemes at the same time and at the same frequency and separates the received signals for each transmitter, a switching part 41 that switches output destinations according to the transmission scheme of the separated signal, and a single-carrier processing part 42 and a multi-carrier processing part 43 provided for each transmission scheme for processing a signal output from the switching part 41 according to its transmission scheme.
摘要:
In SORM (Spectrum-Overlapped Resource Allocation), interference to other cells caused by an increase in transmit power of mobile station apparatuses is suppressed. A wireless control apparatus allows a plurality of wireless terminal apparatuses to locate transmit signals at part of frequencies in a system band in an overlapping manner, and determines frequencies at which the individual wireless terminal apparatuses locate transmit signals, so that an interference level of the entire system band is suppressed to be lower than or equal to a certain value. Also, the wireless control apparatus determines frequencies at which the individual wireless terminal apparatuses locate transmit signals, so that a total sum of frequency bands allocated to the individual wireless terminal apparatuses is smaller than or equal to the system band.
摘要:
There is implemented a clipping technique that does not require a reception apparatus or a transmission apparatus to notify a transmission apparatus or a reception apparatus of information on clipping. A wireless transmission apparatus performs clipping processing not to transmit a spectrum of part of a frequency domain signal when transmitting data to a wireless reception apparatus and determines a frequency band to be subjected to the clipping processing using information other than information notified from the wireless reception apparatus and directly specifying a frequency band to be subjected to the clipping processing.