Abstract:
A base station apparatus wherein the interference suppression symbol combination can be performed in a case of using the repetition technique in a multicarrier communication. In a base station (100), a repetition part (103) repeats or copies each of data symbols received from a modulating part (102) to create a plurality of same data symbols. A phase rotating part (106) imparts, in accordance with a phase rotation angle set by a setting part (107), phase rotations to the pilot and data symbols received from a multiplexing part (105). At this moment, the phase rotating part (106) imparts the phase rotations of the same angle to the pilot and data symbols assigned to the same subcarrier. Further, the phase rotating part (106) causes the phase rotation difference between the same data symbols in a cell to be different from the phase rotation difference between the same symbols in an adjacent cell.
Abstract:
There are disclosed a random access method for establishing an individual channel between a radio communication terminal device and a base station device in a short time and a radio communication terminal device executing the random access method. In this device, in step ST320, a RACH sub-channel allocation unit (211) allocates a transmission packet inputted from a replication unit (202) to an arbitrary sub-carrier at the RACH arbitrary time slot at random. In step ST330, an allocation unit (210) judges whether an overlap is generated in the allocation result obtained by the RACH sub-channel allocation unit (211). When the allocation unit (210) judges that an overlap is generated in the allocation result, the allocation unit (210) causes one of the RACH sub-channel allocation units (211) which has caused the overlap to again perform allocation of step ST320. On the other hand, when judgment is made that no overlap is generated in the allocation result, step ST340 is executed.
Abstract:
An OFDM communication apparatus that can set an optimum repetition number to data to be transmitted, thereby improving the error rate characteristic and hence the communication quality. In this apparatus, a repetition number deciding part (153) decides, based on quality information outputted from a quality information extracting part (152), a required repetition number. A systematic bit repetition number deciding part (154) decides, based on the repetition number notified of by the repetition number deciding part (153), an optimum repetition number for the systematic bit. A parity bit repetition number deciding part (155) operates similarly. Repetition parts (103-1, 103-2) repeat the bits in accordance with instructions from the systematic bit repetition number deciding part (154) and from the parity bit repetition number deciding part (155).
Abstract:
It is possible to provide a radio communication relay device, a radio communication base station device, a radio communication system, and a radio communication method which can effectively use resources and suppress a data delay and system complexity. When a terminal starts an upstream communication with a base station via a repeater in ST403, the base station simultaneously allocates to the terminal, a resource for an initial transmission and a resource for a retransmission by using Grant 1. If the repeater successfully receives UL data transmitted from the terminal in ST404, the repeater relays, in ST406, the UL data transmitted from the terminal, to the base station by using the resource for retransmission which has been allocated to the terminal.
Abstract:
A wireless transmission device enabled to improve an error rate performance at a receiver, by acquiring at least one of frequency diversity effect and a time diversity effect while keeping the interference resistance which is acquired by diffusion. In this transmission device, a modulation unit (101) modulates data to create a modulation symbol having in-phase components and quadrature components. An IQ individual spreading unit (102) arranges the diffusion chips, which are obtained by spreading the modulation symbol, of the in-phase components and the quadrature components, in areas extending in diffusion domains set individually for the in-phase components and the quadrature components. An IQ combining unit (103) combines the arranged spreading chips of the in-phase components and the quadrature components.
Abstract:
A wireless transmission apparatus that can accurately select an optimal modulation scheme on a per block basis in a multi-carrier communication system in which block division of subcarriers and adaptive modulation are performed. In this wireless transmission apparatus, a propagation path characteristics acquisition section acquires the average SNR and SNR variance for each block, which are estimated by a wireless reception apparatus, using received signals inputted from a reception RF section and outputs these to an assignment section. The assignment section selects a modulation scheme for each block based on the average SNR and SNR variance of each block inputted from the propagation path characteristics acquisition section and modulation sections modulate multi-carrier signals included in each block, with the modulation scheme for each block selected by the assignment section.
Abstract:
A wireless transmitting apparatus capable of improving the reception characteristic at a data stream receiving end. In this apparatus, I/Q separating parts (110, 112) each separate first data modulated symbols included in any of a plurality of data streams, which are to be multiplexed, into first in-phase components and first orthogonal components, while separating second data modulated symbols included in the other ones of the plurality of data streams into second in-phase components and second orthogonal components. An I/Q converting part (114) converts the first in-phase components to third orthogonal components, while converting the second orthogonal components to fourth in-phase components. A multi-code multiplexing part multi-code multiplexes the first and third orthogonal components to provide a first multiplexed signal, while multi-code multiplexing the second and fourth in-phase components to provide a second multiplexed signal. An I/Q combining part (124) combines the first and second multiplexed signals to provide a combined signal.
Abstract translation:一种能够改善数据流接收端的接收特性的无线发送装置。 在该装置中,I / Q分离部分(110,112)将包含在多路复用的多个数据流中的任一个中的第一数据调制符号分离成第一同相分量和第一正交分量,同时分离第二数据 包括在多个数据流中的其他数据流中的数据调制符号变为第二同相分量和第二正交分量。 I / Q转换部分(114)将第一同相分量转换为第三正交分量,同时将第二正交分量转换为第四同相分量。 多码复用部分多码复用第一和第三正交分量以提供第一多路复用信号,同时多码复用第二和第四同相分量以提供第二多路复用信号。 I / Q组合部分(124)组合第一和第二复用信号以提供组合信号。
Abstract:
Provided is a radio communication device which can increase a relay performance of a mobile station. In this device, a connection unit (108) performs connection between the local station and a cradle by connecting a connection unit of the cradle. A connection detection unit (109) detects connection between the local station and the cradle and outputs to a relay processing control unit (110), a signal indicating that the connection with the cradle has been detected. If a signal indicating that connection with the cradle has been detected is inputted from the connection detection unit (109), the relay processing control unit (110) outputs a control signal to a relay processing unit (112), a switch (111), and a switch (113) so as to execute a relay process on the signal transferred from the cradle and transmit the obtained signal to the cradle.
Abstract:
Provided is a radio communication base station device capable of acquiring both a multi-user diversity effect and a frequency diversity effect simultaneously in multi-carrier communications. In this device, modulation units (101-1 to 101-n) modulate data to mobile stations (MS#1 to MS#n) individually to create data symbols. A separation unit (102) separates each data symbol inputted, into an Ich (in-phase components) and a Qch (orthogonal components). An Ich arrangement unit (103) and a Qch arrangement unit (104) arrange the Ich and Qch, respectively, in a plurality of sub-carriers constituting an OFDM symbols, and output the same to a synthesization unit (105). This synthesization unit (105) synthesizes the Ich and Qch arranged for each sub-carrier, to create the synthesized symbol.
Abstract:
A wireless communication apparatus capable of suppressing the reduction in the error correction ability in the wireless communication apparatus at the receiving end even when the propagation path environment is bad and hence the reception quality of received signals is low. This apparatus comprises a turbo encoding part (111) for performing an error correction encoding of transport data; a modulating part (113) for modulating the transport data as error correction coded to generate a modulated signal; a modulation diversity modulating part (120) for generating a modulation diversity modulated signal from the modulated signal; an S/P part (133) for generating a transport signal from one of the modulated signal and the modulation diversity modulated signal; and a deciding part (112) for deciding, in accordance with the propagation path environment of the transport signal as wireless transmitted, from which the transport signal is generated by the S/P part (133), the modulated signal or the modulation diversity modulated signal.