Abstract: A receiving apparatus that can effectively use spectra to improve the interference resistance and the information transmission efficiency. In this apparatus, a channel estimating part (1006) uses a pilot received from the transmitting end to perform a channel estimation for each of subcarrier groups. A subcarrier group performance analyzer (1011) calculates, based on a channel estimation result, the SIR value of each subcarrier group. A control command generating part (1012) uses the SIR value of each subcarrier group to generate the puncture information and rate of the subcarrier group, then stores the generated puncture information and rate so as to perform an appropriate process when an S/P converting part (1005) performs an S/P conversion for next received information, and then feeds the generated puncture information and rate back to a transmitting apparatus.

Abstract: A classifying-synthesizing transmission method of multi-user feedback information at a base station. At the base station, a classifier (554) classifies users into a plurality of kinds on the basis of different efficiencies at the time when the base station transmits information to the users. On the basis of the characteristics of synthetic data, a compressor (555) compresses the information synthesized, to reduce the quantity of information to be transmitted. A synthesizer (556) again synthesizes the compressed data of different user kinds. An encoder (557) adds redundant information to the feedback information to be transmitted. A transmitter (524) transmits the encoded feedback information to all users. As a result, the quantity of communication of a downward feedback channel can be drastically reduced to spare the use of radio resources.

Abstract: A desired encoding rate is obtained by an error-correcting encoding apparatus including convolution units provided in parallel with each other. The convolution units provided in parallel with each other perform convoluting processes on source data. An interleaver randomizes the source data provided from one of the convolution units. Puncturing units select data elements form parity data sequences produced by the convolution according to predetermined puncturing patterns. A multiplexing unit provides the parity data elements selected by the puncturing units for the output data sequence.

Abstract: A decoding apparatus is disclosed that is capable of reducing the calculation amount and memory capacity and preventing deterioration of characteristics at high decoding rates. In this decoding apparatus, a transition probability calculation section (201) calculates the transition probability from systematic bit Y1, parity bit Y2 and a priori value La1, and a forward probability calculation section (202) divides a data sequence into a plurality of windows and calculates the forward probability per window. A memory (204) stores a backward probability at a predetermined time calculated in previous iterative decoding and a backward probability calculation section (203) divides a data sequence into a plurality of windows and calculates the backward probability per window using the backward probability stored in the memory (204) as the initial value in iterative decoding of this time.

Abstract: An input control apparatus capable of suppressing characteristic deterioration, reducing the circuit scale of a turbo decoder and effectively using memory of the turbo decoder. In this apparatus, control section (110) acquires information on a coding rate and coding block length of a received signal, determines the number of bits of systematic part Y1, and parity parts Y2 and Y3 in accordance with the coding rate and/or coding block length and so that the number of bits of one sequence of the parity parts falls below the number of bits of systematic part Y1 and controls bit number reduction section (109) so that the determined number of bits is obtained. Bit number reduction section (109) reduces the number of bits of systematic part Y1, and parity parts Y2 and Y3 output from separation section (108) under the control of control section (110) and decoder (111) performs turbo decoding using each sequence reduced by bit number reduction section (109).

Abstract: A peak power suppressing apparatus for suppressing the peak power with simple process without deteriorating the error characteristics of multi-carrier signals. In this apparatus, a modulation section (100) modulates transmission data. A coding section (110) codes the modulated data. An S/P conversion section (120) S/P converts the coded data and outputs the obtained parallel data of a plurality of sequences to an IFFT section (130). The IFFT section (130) performs inverse fast Fourier transform on the parallel data to generate an OFDM signal. A GI adding section (140) adds a guard interval to the OFDM signal. A power conversion section (150) converts the power of the OFDM signal using the non-linear function. AD/A conversion section (160) D/A converts the OFDM signal after the power conversion. A wireless transmission section (170) amplifies the power of the analog signal, performs a predetermined wireless transmission process such as up conversion and transmits the result via an antenna (180).

Abstract: A decoding apparatus that is capable of calculating of the likelihood information at high speed while suppressing increases in processing amount and in circuit scale. In this apparatus, in computations of the backward probability in a backward probability computing section (112), while one processing system calculates the backward probability ?k from the backward probability ?k+2, the other processing system calculates the backward probability ?k?1 from the backward probability ?k+1 in parallel. Specifically considering the case of k=1, backward probabilities ?1, and ?0 are calculated in parallel in two processing systems. The calculated backward probabilities are stored in a storage section (114) on a window basis. Further, as in the backward probability, in a forward probability computing section (113), forward probabilities ?k and ?k+1 are calculated in parallel in two processing systems.

Abstract: A turbo decoder is disclosed that receives a demodulated input signal before a hard decision, including blocks each of multiple data units, and outputs a decoded signal block by block. The turbo decoder includes a decoding part outputting a decoded output signal and extrinsic likelihood information based on the input signal and preliminary likelihood information, the extrinsic likelihood information being used as the preliminary likelihood information in creating the next output signal; a specification part specifying a data unit of the block with respect to which no error is detected in error checking performed on each data unit of the hard decision output signal; and a replacement part inputting a signal sequence, created by replacing signal data before the hard decision with those after the hard decision with respect to the data unit specified by the specification part, to the decoding part as the input signal.

Abstract: A desired encoding rate is obtained by an error-correcting encoding apparatus including convolution units provided in parallel with each other. The convolution units provided in parallel with each other perform convoluting processes on source data. An interleaver randomizes the source data provided from one of the convolution units. Puncturing units select data elements form parity data sequences produced by the convolution according to predetermined puncturing patterns. A multiplexing unit provides the parity data elements selected by the puncturing units for the output data sequence.

Abstract: The present invention provides an optimum combinational configuration of an encoder and an interleaver of an encoding apparatus with the characteristics of a fading channel taken into account. Signals xk and y1k transmitted to a multiplexer are interleaved and input to a multiplexer. This enables the channel interleaver required between an encoder and multiplexer of a conventional apparatus to be removed. The encoding apparatus includes first and second encoders, first and second interleavers and a multiplexer which multiplexes an output from the first interleaving with an output from the second encoder. Conventionally, a channel interleaver has been provided as a countermeasure against fading. However, in this case, the delay of the channel interleaver is extended to reduce the bit error rate. Therefore, the channel interleaver is removed, and the interleaver is connected in parallel in the encoder so that the delay allowed for one interleaver is extended, thereby improving the transmission characteristics.

Abstract: An encoding device adds parity data to source data and outputs the data. The parity data is generated based on the output of the first encoding unit and the second encoding unit. The first encoding unit encodes the source data. The second encoding unit encodes the data obtained by a plurality of interleavers connected in parallel. The plurality of interleavers perform different randomizing processes on the source data.

Abstract: A desired encoding rate is obtained by an error-correcting encoding apparatus including convolution units provided in parallel with each other. The convolution units provided in parallel with each other perform convoluting processes on source data. An interleaver randomizes the source data provided from one of the convolution units. Puncturing units select data elements form parity data sequences produced by the convolution according to predetermined puncturing patterns. A multiplexing unit provides the parity data elements selected by the puncturing units for the output data sequence.

Abstract: An encoding device adds parity data to source data and outputs the data. The parity data is generated based on the output of the first encoding unit and the second encoding unit. The first encoding unit encodes the source data. The second encoding unit encodes the data obtained by a plurality of interleavers connected in parallel. The plurality of interleavers perform different randomizing processes on the source data.