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 communication terminal apparatus and a CQI selecting method wherein when CQIs are grouped according to their levels and then an upper-order CQI, which is indicative of a group, is to be informed in a longer period, while a lower-order CQI, which identifies a CQI in the group, being to be informed in a shorter period, the CQI is precisely selected. A reception SIR range of 0-4 dB in UE corresponds to a level 1 of upper-order CQI. A next reception SIR range of 4-8 dB corresponds to a level 2 of upper-order CQI. Similarly, the following SIR ranges up to 24 dB, each of which is 4 dB higher than a respective previous one, correspond to the respective following levels of upper-order CQI. On the other hand, the levels 1-4 of lower-order CQI, with which the level 1 of upper-order CQI is associated, correspond to a SIR range of ?1-5 dB. The levels 1-4 of lower-order CQI, with which the level 2 of upper-order CQI is associated, correspond to a SIR range of 2-9 dB.

Abstract: Disclosed are a radio communication base station device, a radio communication terminal device, and a radio communication method which can reduce interference between adjacent resource blocks even when the DL timing is overlapped with the UL timing at the boundary between an independent allocation band and a cooperation allocation band. When a terminal A is allocated for a UL resource block of the cooperation allocation band serving as a band boundary with the independent allocation band, in ST301, a terminal A transmits a horizontally polarized wave signal to respective terminals B to D, and in ST302, a base station (100) transmits a vertically polarized signal to respective terminals A to D. In ST303, the terminals B to D measure XPD of the received vertically polarized signal and the horizontally polarized signal. In ST304, the terminals B to D transmit the XPD report value to the base station (100).

Abstract: A wireless transmission method for improving the reception characteristic of a preamble. The wireless transmission method allows the patterns of subcarriers (transmitting antenna Tx1: 1, 2, 3, 5, 6, 7, 8, . . . , transmitting antenna Tx2: 4, 9, 10, 12, 13, 14, . . . ) in which preamble sequences are continuously arranged to be changed in a frequency direction. With this, the preamble sequences can be arranged at random subcarrier intervals and, when the autocorrelation values of the preamble sequences are obtained in a time domain, the peak value of the sidelobe becomes small, thereby making it possible to prevent a timing detection error.

Abstract: It is possible to provide a base station device, a mobile station device, a communication system, a channel estimation method, a transmission antenna detection method, and a program which can employ PVS as the SCH transmission diversity method and avoid a side lobe to improve the adjacent cell search performance. When employing the PVS on the frequency axis of the SCH in these, different precoding weights are applied between sub carrier groups so as to correlate a plurality of PSC sequences to a precoding weight matrix and identify the PSC sequence. Moreover, the number of sub carriers to be allocated to sub carrier groups is correlated to the number of transmission antennas so as to detect periodicity of the self-correlation characteristic of a reception SCH signal, thereby identifying the number of transmission antennas.

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.

Abstract: It is possible to provide a novel pilot transmission method which can calculate an accurate channel estimation value, a MIMO transmission device using the pilot transmission method, and a MIMO reception device which performs communication with the MIMO transmission device. The MIMO transmission device (100) includes a cyclic shift processing unit (150) which cyclically shifts a first pilot signal sequence spread by a spread code 1 and second pilot signal sequence spread by a spread code 2 with different shift amounts. The first pilot signal sequence and the second pilot signal sequence which have been cyclically shifted are transmitted from different transmitting antennas at the same pilot transmission symbol section. Thus, by changing the shift amount of the cyclic shift process executed on each pilot signal sequence spread by the respective spread codes, it is possible to improve the pilot separation accuracy at a reception side. This enables more accurate calculation of a channel estimation value.

Abstract: Provided is a MIMO transmission device which can effectively perform a pilot transmission by using a surplus sample generated in a pilot symbol while maintaining the pilot separation accuracy at a reception side. The MIMO transmission device (100) transmits a pilot symbol as follows. That is, in a first pilot transmission symbol section, a transmission section of a pilot signal transmitted from a first transmission antenna is partially overlapped by a pilot transmission section of a second transmission antenna. In a second pilot transmission symbol section, a pilot transmission section of the first transmission antenna is partially overlapped by a pilot transmission section of a third antenna. Among the pilot signals transmitted from the first antenna, the interference portions overlapped by transmission pilot signals from other antennas are different between the first pilot transmission symbol section and the second pilot transmission symbol section.

Abstract: It is possible to provide a novel pilot transmission method which can calculate an accurate channel estimation value, a MIMO transmission device using the pilot transmission method, and a MIMO reception device which communicates with the MIMO transmission device. The MIMO transmission device (100) includes phase adjustment units (130-1, 130-2) which are controlled by a pilot transmission control unit (170) to multiply parallel pilot signals by a phase adjustment coefficient group so as to adjust the pilot signal transmission timing. The pilot transmission control unit (170) differentiates the order of the transmitting antennas in accordance with the pilot transmission timing between an even-number subcarrier group and an odd-number subcarrier group. At a reception side, a path not influenced by the inter-path interference is extracted for each of the combinations of the transmitting antennas and the subcarrier groups.

Abstract: A wireless communication device is provided to make it possible to detect errors with high accuracy while to suppress reduction in throughput in the case that an LDPC (Low-Density Parity-Check) code is used for an error correcting code. In the wireless communication device, a CRC (Cyclic Redundancy Check) coding unit (101) for carrying out a CRC coding of a part of a transmitting bit sequence in accordance with a row weight of an examination matrix of the LDPC code, an LDPC coding unit (102) for carrying out the LDPC coding and generating LDPC coding data by using the same examination matrix as used for the LDPC coding carried out in the CRC coding unit (101).

Abstract: A radio transmission apparatus and method for multicasting or broadcasting common data to a plurality of radio receiving apparatuses. The apparatus and method acquire per-subcarrier reception quality information from a radio receiving apparatus. A subcarrier is selected for the multicasting or broadcasting among a plurality of subcarriers, each of which has a different frequency, based on the acquired per-subcarrier reception quality information. And the transmission power of the selected subcarrier is controlled.

Abstract: It is possible to provide a transmission control method, a radio communication system, and a radio base station device which can reduce the time required until an inter-cell interference is reduced so as to improve the system throughput. A base station (200) includes: an FFT unit (210) which receives an interference report transmitted by using a common radio resource common to adjacent cells from a plurality of radio terminals (100) existing in different adjacent cells; and an adaptive FFR processing unit (230) which controls adaptive FFR processing in a downstream line of the local cell according to the reception interference report. Thus, by receiving an interference report directly from the radio terminals (100) existing in adjacent cells, it is possible to modify the transmission mode by considering the interference state in the adjacent cells. This eliminates the need of sending a report on a transmission mode modification which has been conventionally sent between adjacent base stations (200).

Abstract: A radio transmitting apparatus and the like for improving the reception error rate characteristic. In this apparatus, a data modulating part (121) modulates a data signal to provide a modulated symbol. A Q-inverting part (125) generates a symbol that corresponds to the modulated symbol provided by the data modulating part (121) and that, when combined with the modulated symbol, becomes a signal having a particular value. A multiplexing part (110) multiplexes the modulated symbol provided by the data modulating part (121) with the corresponding symbol generated by the Q-inverting part (125) to provide a multiplexed signal.

Abstract: Provided is a mobile station capable of increasing the use efficiency of a transmission resource. The mobile station (100) includes: a line quality measuring unit (105) which measures SINR of a pilot symbol; a CQI generation unit (106) which generates a CQI corresponding to the SINR; and a resource allocation unit (107) allocates a subcarrier corresponding to the content of an inputted CQI among a plurality of subcarriers (i.e., a plurality of resources) to the CQI according to a common reference table in a plurality of mobile stations. Accordingly, in a plurality of mobile stations, the CQI having the same content are mapped to the same subcarrier.

Abstract: Provided is a radio transmission device capable of improving reception accuracy of a unicast channel received after a multicast channel. In the radio transmission device, a multicast transmission power control unit (106) performs control to reduce the transmission power of the OFDM symbol at the end of a sub frame for a multicast signal outputted from a CP insertion unit (105-2). A radio transmission unit (108) transmits a unicast signal multiplexed by a sub frame multiplexing unit (107) and a multicast signal of controlled transmission power via a transmission antenna (109).

Abstract: Provided is a base station capable of giving a pilot appropriate for both of multicast data and unicast data which are frequency-multiplexed. In a pilot generation unit (105) of the base station, an insertion unit (1051) inserts a pilot (common pilot) common to a plurality of cells to generate an orthogonal pilot sequence (2). In accordance with the insertion process in the insertion unit (1051), an insertion unit (1052) inserts a sequence (common sequence) common to a plurality of cells to a unique scrambling sequence to generate a scrambling sequence. A scrambling unit (1053) performs a scrambling process for multiplying the orthogonal pilot sequence (2) by the scrambling sequence. This scrambling process generates, in a part of pilot sequences different for respective cells, a pilot sequence containing a pilot common to the cells.

Abstract: In order to reduce interference between cells through hopping and use frequencies in a good propagation situation, a scheduler section 102 carries out scheduling for determining to which user data should be sent using CQI from each communication terminal apparatus, selects a user signal to be sent in the next frame and determines in which subcarrier block the data should be sent. An MCS decision section 103 selects a modulation scheme and coding method from the CQI of the selected user signal. A subcarrier block selection section 110 selects a subcarrier block instructed by the scheduler section 102 for each user signal. For the respective subcarrier blocks, FH sequence selection sections 111-1 to 111-n select hopping patterns. A subcarrier mapping section 112 maps the user signal and control data to subcarriers according to the selected hopping pattern.

Abstract: It is possible to use a frequency of a preferable propagation condition while reducing the other cell interference by hopping. A scheduler section (102) performs scheduling for deciding a user to whom data is transmitted, by using the CQI from each communication terminal device, selects a user signal to be transmitted in the next frame, and decides a sub-carrier block by which the transmission is performed. An MCS judgment section (103) selects a modulation method and a coding method from the CQI of the user signal selected. A sub-carrier block selection section (110) selects a sub-carrier block specified by the scheduler section (102) for each user signal. For each of the sub-carrier blocks, the hopping pattern is selected by FH-sequence selection sections (111-1 to 111-n). A sub-carrier mapping section (112) maps the user signal and the control data to the sub-carrier according to the hopping pattern selected.

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.

Abstract: It is possible to provide a radio communication device and a CQI generation method capable of reducing the total number of CQI when reporting CQI for each level in a hierarchized RB. In the device and the method, the RB hierarchy is made as follows: a plurality of groups each consisting of the same number of RB are made to be one level, a group consisting of a plenty of RB is made to be a lower level, and a group consisting of a small number of RB is made to be a higher level. UE reports CQI for each level to Node B according to the RB reception quality at a longer cycle for lower level and at a shorter cycle for a higher level.