摘要:
It is an object to provide a wireless communication base station device that can prevent the decline of a system throughput due to the degradation of a utilization efficiency of a communication resource of a channel for carrying out a frequency diversity transmission when a frequency scheduling transmission and a frequency diversity transmission are concurrently carried out in multiple carrier communication. In the wireless communication base station device, a modulation unit (12) carries out modulation processing for Dch data after coding to generate a Dch data symbol. A modulation unit (22) carries out modulation processing for Lch data after coding to generate an Lch data symbol. An allocation unit (103) allocates the Dch data symbol and Lch data symbol to each sub-carrier composing an OFDM symbol and outputs the allocated sub-carrier to a multiplex unit (104). In this case, the allocation unit (103) allocates the Dch data symbol to a plurality of resource blocks where one Dch is arranged at an interval equal to integral multiples of the number of resource blocks composing a resource block group.
摘要:
A PL demodulating unit (203) demodulates a pilot signal in a received signal. An SIR determining unit (205) determines the reception quality of the demodulated pilot signal. An fd determining unit (206) determines the Doppler frequency by use of the demodulated pilot signal. A requested-modulation-mode deciding unit (207) uses the reception quality of the pilot signal and the determined Doppler frequency to decide the modulation mode for which to request the base station apparatus. A command generating unit (208) generates a command corresponding to the decided modulation mode. An adaptive demodulation unit (204) demodulates the received signal by use of the demodulation mode corresponding to the modulation mode decided by the requested- modulation-mode deciding unit (207). In this way, the reception quality can be kept high even under a fading condition.
摘要:
It is possible to provide a radio communication system, a radio base station device, and a radio terminal device capable of reducing the power consumption in a radio terminal device without thinning pilot signals used for measuring upstream line quality. In the radio base station device (100) used in a radio communication system using different frequency bands for the upstream line and the downstream line, an upstream line pilot generation unit (115) forms a CQI measuring pilot signal and an upstream line RF unit (105) transmits the communication quality measuring pilot signal by using the upstream line use frequency band in the upstream line pilot transmission section. ; Thus, the upstream communication quality measuring pilot signal used by the radio base station device (100) to measure the line quality is transmitted by using the upstream line frequency band and accordingly, it is possible to reduce the power consumption in the radio terminal device.
摘要:
Provided is a radio communication device which can separate propagation paths of antenna ports and improve a channel estimation accuracy even when using virtual antennas. The device includes: a mapping unit (103) which maps a data signal after modulation to a virtual antenna (0) and a virtual antenna (1); a phase inversion unit (104) which inverts the phase of S0 transmitted from an antenna port (2) in synchronization with a phase inversion unit (105) between the odd-number slot and the even-number slot; the phase inversion unit (105) which inverts the phase of R0 transmitted from the antenna port (2); a phase inversion unit (113) which inverts the phase of S1 transmitted from an antenna port (3) in synchronization with a phase inversion unit (114); and the phase inversion unit (114) which inverts the phase of R1 transmitted from an antenna port (3).
摘要:
Provided is a radio communication device which can prevent interference between SRS and PUCCH when the PUCCH transmission bandwidth fluctuates and suppress degradation of CQI estimation accuracy by the band where no SRS is transmitted. The device includes: an SRS code generation unit (201) which generates an SRS (Sounding Reference Signal) for measuring uplink line data channel quality; an SRS arrangement unit (202) which frequency-multiplexes the SRS on the SR transmission band and arranges it; and an SRS arrangement control unit (208) which controls SRS frequency multiplex so as to be uniform in frequency without modifying the bandwidth of one SRS multiplex unit in accordance with the fluctuation of the reference signal transmission bandwidth according to the SRS arrangement information transmitted from the base station and furthermore controls the transmission interval of the frequency-multiplexed SRS.
摘要:
Desired signal power measured at a desired signal power measuring circuit 105 is averaged over a plurality of slots by an averaging circuit 106 to reduce a power error in desired signal power of each slot. An SIR measuring circuit 108 calculates SIR(n)of each slot from the average value of desired signal power in the plurality of slots and the measured value of interference signal power of each slot, and a TPC generating circuit 109 makes a comparison between SIR(n) of each slot and a threshold value, and generates transmission power control information. This makes it possible to control transmission power for each slot with high accuracy in asymmetrical communication.
摘要:
A retransmission request signal producing unit (119) outputs, based on an error detection result applied from an error detector unit (118), an ACK or NACK signal to a NACK signal counter unit (120). The NACK signal counter unit (120) counts, for each communication mode, the number of outputted NACK signals (i.e., the number of the times of data retransmission) until the retransmission request signal producing unit (119) outputs an ACK signal. A table rewriting unit (121) compares the retransmission times counted by the NACK signal counter unit (120) with a predetermined threshold value of retransmission times, and rewrites, based on that comparison result, the contents of a communication mode table (102).