Abstract: A communication terminal device includes: a turbo encoder that performs two systems of convolutional encoding with respect to input data and preforms turbo encoding processing with in-block interleave preformed on one of the two systems using an internal interleaver. Rate matching (puncturing) units which puncture an output of the turbo encoder based on a predetermined rate matching algorithm and interleavers, which change the output of the turbo encoder such that a puncturing cycle based on the rate matching algorithm of the rate matching units is changed. Accordingly, turbo code performance is improved.

Abstract: A wireless communication system wherein frame data is encoded with an outer code and then divided into predetermined number of blocks which are encoded with an inner code into transmission data. In a receiver, a decoder decodes the received transmission data in accordance with the inner code, a retransmission order determining unit determines whether to perform a retransmission order in units of blocks based on the likelihood information (decoded soft-decision value). At this time, the retransmission order determining unit inhibits the retransmission order for the block if the number of inner-code errors in a frame consisting of predetermined number of blocks stays within a limit of what the outer code can correct at a decoder and determines that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit.

Abstract: The present invention provides a receiving apparatus and method in which frequency of calculation such as weighting multiplication and memory capacity of a frame buffer can be reduced. To this end, reference phase information and data are separated by a reference phase inverse spreading unit (106) and a data portion inverse spreading unit (107), respectively. A weighting coefficient calculating unit (115) calculates weighting coefficients based on SNR values as transmission line information from an SNR calculating unit (114) and sends calculated weighting coefficients to a multiplier (109), where phase correction values based on the reference phase information are multiplied by the weighting coefficients to be correction coefficients.

Abstract: Disclosed is a method and an apparatus for controlling transmission electric power capable of minimizing a decrease in the amount of maximum transmission electric power without degrading an adjacent channel leakage power ratio when code-multiplexing additional control information with data and main control information. A mobile device checks values of gain factors ?d and ?c when performing code multiplexing to transmit signals from channels DPDCH to transmit data, DPCCH to transmit main control information, and HS-DPCCH to transmit additional control information. A maximum transmission electric power is decreased at a plurality of levels based on the check result and a ratio (?hs) between the gain factors ?c and ?hs. It may be preferable to check the presence or absence of transmission data instead of the gain factor ?d. In this case, when no transmission data is available, the maximum transmission electric power is decreased at a plurality of levels based on ?hs.

Abstract: Provides a normalizing apparatus that normalizes input signals to a turbo decoder without significantly increasing a size of a circuit. An input signal buffer (341) obtains a sum S for N pieces of input signal data I(i). An input data averaging part (342) obtains an average A by dividing the sum S by the number of data N. A divider (343) obtains normalized data I(i)/A by dividing the input signals I(i) by the average A. A weighting part (345) multiplies the normalized data I(i)/A with a weighting coefficient ?, which is determined based on a ratio of a number of input data and a number of output data in rate matching. As a result, the normalization is made possible. Because a signal receiving quality does not need to be determined, an increase in circuit size is inhibited.

Abstract: Disclosed is a method and an apparatus for controlling transmission electric power capable of minimizing a decrease in the amount of maximum transmission electric power without degrading an adjacent channel leakage power ratio when code-multiplexing additional control information with data and main control information. A mobile device checks values of gain factors ?d and ?c when performing code multiplexing to transmit signals from channels DPDCH to transmit data, DPCCH to transmit main control information, and HS-DPCCH to transmit additional control information. A maximum transmission electric power is decreased at a plurality of levels based on the check result and a ratio (?hs) between the gain factors ?c and ?hs. It may be preferable to check the presence or absence of transmission data instead of the gain factor ?d. In this case, when no transmission data is available, the maximum transmission electric power is decreased at a plurality of levels based on ?hs.

Abstract: A data reception device is provided with: a puncture rate detection element to detect the puncture rate of received data, an interpolation element to interpolate bits decimated at the detected puncture rate, a deinterleaving element to restore interleaved data to the original arrangement, and a turbo-decoding element, while variably setting the length of the learning interval according to the puncture rate detected by the puncture rate detection element, to input sliding window data and the data of the above learning interval following the data of the sliding window to the data processed by the interpolation element and deinterleaving element, and to perform recursive operations to decode the data of the sliding window. The valid received signal contained in the learning interval can be maintained approximately constant even if the puncture rate changes.

Abstract: A decoding apparatus, decoding method, data-receiving apparatus, and a data-receiving method for performing a maximum-likelihood decoding process based on a Viterbi algorithm on a data train completing a convolution-encoding process. The apparatus includes a computation device for performing a trellis computation for decoding a data train completing the convolution-encoding process. The decoding apparatus further includes a control device for controlling the trellis computation to be carried out by the computation device with processing timings in processing units each corresponding to a process carried out on n bits of pre-encoding data, in which each of the processing units is parallel processing carried out on computation results obtained for 2n states with one of the processing timings immediately preceding a present one of the processing timings to find the computation results with the present processing timing for the 2n states.

Abstract: The invention proposes a device for generating, from incoming signal values (Xi,n), soft-values (Yi,n) to be input into a channel decoder of a communication device for use in a wireless communication system, comprising truncation means (24, 26, 28) for truncating the incoming signal values (Xi,n) such as to fall within a predetermined limit value range, and normalization means (30, 32) for normalizing the truncated signal values (Xti,n) such as to fit to an input range of the decoder. According to the invention, the truncation means (24, 26, 28) are adapted to determine the boundaries of the limit value range in dependence on information representative of a signal-to-noise ratio of the incoming signal values (Xi,n). The truncated signal values (Xti,n), after normalization, then are output as said soft-values (Yi,n).

Abstract: Disclosed is a wireless communication system wherein frame data is encoded with an outer code and then divided into predetermined number of blocks which are encoded with an inner code into transmission data which a receiver receives by wireless In the receiver, a decoder decodes the received transmission data in accordance with the inner code, a retransmission order determining unit determines whether or not to perform a retransmission order in units of blocks based on the likelihood information (decoded soft-decision value). At this time, the retransmission order determining unit inhibits the retransmission order for the block if the number of inner-code errors in a frame consisting of predetermined number of blocks stays within a limit of what the outer code can correct at a decoder and determines that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit.

Abstract: A data reception device is provided with: a puncture rate detection element to detect the puncture rate of received data, an interpolation element to interpolate bits decimated at the detected puncture rate, a deinterleaving element to restore interleaved data to the original arrangement, and a turbo-decoding element, while variably setting the length of the learning interval according to the puncture rate detected by the puncture rate detection element, to input sliding window data and the data of the above learning interval following the data of the sliding window to the data processed by the interpolation element and deinterleaving element, and to perform recursive operations to decode the data of the sliding window. The valid received signal contained in the learning interval can be maintained approximately constant even if the puncture rate changes.

Abstract: A decoding apparatus, decoding method, data-receiving apparatus, and a data-receiving method for performing a maximum-likelihood decoding process based on a Viterbi algorithm on a data train completing a convolution-encoding process. The apparatus includes a computation device for performing a trellis computation for decoding a data train completing the convolution-encoding process. The decoding apparatus further includes a control device for controlling the trellis computation to be carried out by the computation device with processing timings in processing units each corresponding to a process carried out on n bits of pre-encoding data, in which each of the processing units is parallel processing carried out on computation results obtained for 2n states with one of the processing timings immediately preceding a present one of the processing timings to find the computation results with the present processing timing for the 2n states.

Abstract: Removing adverse effects in case error detection using error detection codes cannot be performed correctly, and improving the data transmission efficiency. The turbo decoder 6 compares data which is decoded this time with data which is decoded previous time, both of which are decoded in repetitive decoding processing, to obtain discord number information indicative of the number of discordant sign bits, and sends the information to a terminal I/F unit 7 and a packet flow retransmission controlling unit 10. Even though it is determined that error detection result from a CRC recalculating unit 9 shows that there exists no bit error, in case the number of discordant sign bits is larger than a predetermined threshold value, it is determined that there is generated error. And, a packet flow retransmission controlling unit 10 sends a signal requesting retransmission of data.

Abstract: A communication terminal device of the present invention includes: a turbo encoder 10 that performs two systems of convolutional encoding (12 through 16, and 20 through 24) with respect to input data 11 which should be transmitted and that preforms turbo encoding processing with in-block interleave preformed on one of the two systems (20 through 24) using an internal interleaver 19; rate matching (puncturing) units 27 and 29 which puncture an output of the turbo encoder based on a predetermined rate matching algorithm; and interleavers 26 and 28 which change the output of the turbo encoder 10 such that a puncturing cycle based on the rate matching algorithm of the rate matching (puncturing) units 27 and 29 is changed. Accordingly, turbo code performance can be prevented from deteriorating when communication is performed at a specific coding rate in mobile phone in a 3GPP mobile communication system.

Abstract: A decoding apparatus, decoding method, data-receiving apparatus, and a data-receiving method for performing a maximum-likelihood decoding process based on a Viterbi algorithm on a data train completing a convolution-encoding process. The apparatus includes a computation device for performing a trellis computation for decoding a data train completing the convolution-encoding process. The decoding apparatus further includes a control device for controlling the trellis computation to be carried out by the computation device with processing timings in processing units each corresponding to a process carried out on n bits of pre-encoding data, in which each of the processing units is parallel processing carried out on computation results obtained for 2n states with one of the processing timings immediately preceding a present one of the processing timings to find the computation results with the present processing timing for the 2n states.

Abstract: The invention aims to decrease a processing load and power consumption for a path searcher during a soft hand-over process and fast search for multipath signals. The invention is so configured that correlation integrators 18a through 18h are divided into a group to search a base station as hand-over origin for multipath signals and another group to search a base station as hand-over destination for multipath signals. This makes it possible to simultaneously search the base stations as hand-over origin and destination for multipath signals. Consequently, a single process can search the base stations as hand-over origin and destination for multipath signals. It is possible to decrease a processing load and power consumption for the path searcher during the soft hand-over process. In addition, multipath signals can be searched fast.

Abstract: Provides a normalizing apparatus that normalizes input signals to a turbo decoder without significantly increasing a size of a circuit. An input signal buffer (341) obtains a sum S for N pieces of input signal data I (i). An input data averaging part (342) obtains an average A by dividing the sum S by the number of data N. A divider (343) obtains normalized data I (i)/A by dividing the input signals I (i) by the average A. A weighting part (345) multiplies the normalized data I(i)/A with a weighting coefficient &agr;, which is determined based on a ratio of a number of input data and a number of output data in rate matching. As a result, the normalization is made possible. Because a signal receiving quality does not need to be determined, an increase in circuit size is inhibited.

Abstract: The spread spectrum communication system based on the CDMA-FDD system in which two or more carrier frequencies can be selectively used in the present invention is equipped with the section that carries out handover between base stations with the same carrier frequency switched by a spreading code from a carrier frequency used in communication and the section that switches carrier frequencies within the handover base station after handover between base stations is completed. This allows the mobile station to carry out handover between base stations with different frequencies without the mobile station transmitting/receiving two or more carrier frequencies simultaneously.

Abstract: The present invention provides a receiving apparatus and a receiving method in which frequency of calculation such as weighting multiplication can be reduced and memory capacity of a frame buffer can be reduced. To this end, reference phase information and data are separated by a reference phase inverse spreading unit (106) and a data portion inverse spreading unit (107), respectively. A weighting coefficient calculating unit (115) calculates weighting coefficients based on SNR values as transmission line information from an SNR calculating unit (114), and sends thus calculated weighting coefficients to a multiplier (109) where phase correction values based on the reference phase information are multiplied by the weighting coefficients to be correction coefficients. A multiplier (111) multiplies reception data from the data portion inverse spreading unit (107) by the correction coefficients, and output data from the multiplier (111) is restricted in bit width by the bit width restricting unit (112).

Abstract: The present invention relates to a code generating method for combining an orthogonal code for CDMA having a specific spreading factor and its polarity inverted spreading code to generate another spreading code having a larger spreading factor than that of the spreading code. And the present invention relates to a code selecting method for combining an orthogonal code for CDMA having a specific spreading factor and its polarity inverted spreading code to generate another spreading code having a larger spreading factor than that of the spreading code, then to assign the generated orthogonal code for a user in order of users having an orthogonal code of small spreading factor.