Abstract: The present invention discloses an encoding apparatus using a Discrete Cosine Transform (DCT) scanning, which includes a mode selection means for selecting an optimal mode for intra prediction; an intra prediction means for performing intra prediction onto video inputted based on the mode selected in the mode selection means; a DCT and quantization means for performing DCT and quantization onto residual coefficients of a block outputted from the intra prediction means; and an entropy encoding means for performing entropy encoding onto DCT coefficients acquired from the DCT and quantization by using a scanning mode decided based on pixel similarity of the residual coefficients.

Abstract: A serial-parallel converter 102 of a transmitter apparatus receives an input of a signal to be transmitted and serial-parallel-converts this to output m (m?2) number of intermediate signals. A unitary matrix modulator 103 modulates the output m number of intermediate signals into a unitary matrix of m rows and m columns whose components other than diagonal components are 0 and outputs the obtained matrix. A splitter 111 supplies the respective diagonal components of the output matrix to the input channels of an inverse Fourier transform unit 112 as input signals. The inverse Fourier transform unit 112 outputs m number of inverse-Fourier-transformed signals obtained by performing inverse Fourier transform of the supplied input signals. A parallel-serial converter 113 parallel-serial-converts the output m number of inverse-Fourier-transformed signals to output one transmission signal. A transmission unit 114 transmits the output transmission signal.

Abstract: When a receiver (200) receives a signal transmitted from a transmitter, an A/D converter (204) converts the signal into a digital signal having two or more levels by A/D conversion. A zero-level detector (207) converts the signal into a two-level digital signal of positive and negative levels. The converted signals are subjected to spectrum despreading by correlators (206, 208), respectively. Whichever signal has a higher intensity is selected by absolute value detectors (209, 210), a comparator (211), and a switch (212). A decoder (213) decodes the selected signal. In a receiving state where the zero-level detector (207) is selected, the transmitter transmits the transmission signal after the signal is converted into a two-level signal. In a receiving state where the A/D converter (204) is selected, the transmitter transmits the transmission signal after the signal is converted into a signal having two or more levels.

Abstract: In a transmission device 101, a modulation portion 102 carries out modulation of encoded data based on an adaptive modulation command based on feedback information sent from the receiving side, a frequency symbol diffusion block 105 multiplies the plurality of signals outputted by a serial-parallel conversion portion 104 by an orthogonal diffusion code and combines them, a pseudo random-number multiplication portion 106 multiplies each of them by a pseudo random number, an inverse Fourier transform portion 107 conducts inverse Fourier transform, a parallel-serial conversion portion 108 conducts parallel-serial conversion, a guard interval addition portion 109 adds a guard interval and a transmission portion 110 transmits a signal so that only one feedback information and modulation level information is required for each frequency symbol diffusion block 105 and transmission rate can be improved.

Abstract: A transmitter codes data to be transferred, performs serial-parallel conversion of the data to two signal groups, and passes one of the groups to a first transmission unit and the other one to a second transmission unit. Each of the first transmission unit and the second transmission unit performs a prephasing process on each of signals included in the input signal group received, performs inverse Fourier transform thereon, and transmits the signal with a predetermined polarization. The polarity of the predetermined polarization of the first transmission is orthogonal to a polarity of the predetermined polarization of the second transmission unit.

Abstract: A transmitter 131 in a communication system 101 receives data to be transferred, performs STBC coding thereon to acquire two signals, performs an OFDM transmission process on the signals which are radio-transmitted to from antennas 141, 142 having polarization polarities orthogonal to each other. A receiver 151 radio-receives the signals using antennas 161, 162 having polarization polarities orthogonal to each other, and performs STBC decoding on two signals acquired by performing an OFDM reception process on the received signals, respectively, thereby acquiring the transferred data. The inclinations of the antenna 141 and the antenna 161 are equal to the inclinations of the antenna 142 and the antenna 162, and are typically 45 degrees.

Abstract: A coding section 201 of a transmitter receives an input of a transmitting signal and LDPC-codes the received signal, a serial-to-parallel conversion section 102 converts the coded signal from serial to parallel, and outputs m (m?2) intermediate signals, a unitary matrix modulation section 103 modulates the m intermediate signals to a unitary matrix of m rows and m columns where elements excepting diagonal elements are zero, and outputs an obtained matrix, a split section 111 supplies each of the diagonal elements of the matrix to each input channel of an inverse Fourier transform section 112 as an input signal, the inverse Fourier transform section 112 inversely Fourier transforms the input signals supplied to the input channels, and outputs the obtained m inversely Fourier transformed signals, a parallel-to-serial conversion section 113 converts the m inversely Fourier transformed signals from parallel to serial, and outputs one transmission signal, a transmitting section 114 transmits the output transmissio

Abstract: A serial-parallel converter 102 of a transmitter apparatus receives an input of a signal to be transmitted and serial-parallel-converts this to output m (m?2) number of intermediate signals. A unitary matrix modulator 103 modulates the output m number of intermediate signals into a unitary matrix of m rows and m columns whose components other than diagonal components are 0 and outputs the obtained matrix. A splitter 111 supplies the respective diagonal components of the output matrix to the input channels of an inverse Fourier transform unit 112 as input signals. The inverse Fourier transform unit 112 outputs m number of inverse-Fourier-transformed signals obtained by performing inverse Fourier transform of the supplied input signals. A parallel-serial converter 113 parallel-serial-converts the output m number of inverse-Fourier-transformed signals to output one transmission signal. A transmission unit 114 transmits the output transmission signal.

Abstract: A serial-parallel converter 102 of a transmitter apparatus receives an input of a signal to be transmitted and serial-parallel-converts this to output m (m?2) number of intermediate signals. A unitary matrix modulator 103 modulates the output m number of intermediate signals into a unitary matrix of m rows and m columns whose components other than diagonal components are 0 and outputs the obtained matrix. A splitter 111 supplies the respective diagonal components of the output matrix to the input channels of an inverse Fourier transform unit 112 as input signals. The inverse Fourier transform unit 112 outputs m number of inverse-Fourier-transformed signals obtained by performing inverse Fourier transform of the supplied input signals. A parallel-serial converter 113 parallel-serial-converts the output m number of inverse-Fourier-transformed signals to output one transmission signal. A transmission unit 114 transmits the output transmission signal.

Abstract: In a transmission device 101, a modulation portion 102 carries out modulation of encoded data based on an adaptive modulation command based on feedback information sent from the receiving side, a frequency symbol diffusion block 105 multiplies the plurality of signals outputted by a serial-parallel conversion portion 104 by an orthogonal diffusion code and combines them, a pseudo random-number multiplication portion 106 multiplies each of them by a pseudo random number, an inverse Fourier transform portion 107 conducts inverse Fourier transform, a parallel-serial conversion portion 108 conducts parallel-serial conversion, a guard interval addition portion 109 adds a guard interval and a transmission portion 110 transmits a signal so that only one feedback information and modulation level information is required for each frequency symbol diffusion block 105 and transmission rate can be improved.

Abstract: A transmitter 131 in a communication system 101 receives data to be transferred, performs STBC coding thereon to acquire two signals, performs an OFDM transmission process on the signals which are radio-transmitted to from antennas 141, 142 having polarization polarities orthogonal to each other. A receiver 151 radio-receives the signals using antennas 161, 162 having polarization polarities orthogonal to each other, and performs STBC decoding on two signals acquired by performing an OFDM reception process on the received signals, respectively, thereby acquiring the transferred data. The inclinations of the antenna 141 and the antenna 161 are equal to the inclinations of the antenna 142 and the antenna 162, and are typically 45 degrees.

Abstract: When a receiver (200) receives a signal transmitted from a transmitter, an A/D converter (204) converts the signal into a digital signal having two or more levels by A/D conversion. A zero-level detector (207) converts the signal into a two-level digital signal of positive and negative levels. The converted signals are subjected to spectrum despreading by correlators (206, 208), respectively. Whichever signal has a higher intensity is selected by absolute value detectors (209, 210), a comparator (211), and a switch (212). A decoder (213) decodes the selected signal. In a receiving state where the zero-level detector (207) is selected, the transmitter transmits the transmission signal after the signal is converted into a two-level signal. In a receiving state where the A/D converter (204) is selected, the transmitter transmits the transmission signal after the signal is converted into a signal having two or more levels.

Abstract: A communicating system is disclosed. The communicating system has a base station and a plurality of mobile stations that radio-communicate through an uplink channel and a downlink channel with frames each of which is composed of a plurality of time divided slots, each of the frames of the uplink channel and the downlink channel being transmitted in accordance with OFDM transmitting system. An OFDM sub carrier used in the OFDM transmitting system is divided in accordance with a predetermined diving method, each of the frames of the uplink channel or downlink channel being allocated to the divided portions of the OFDM sub carrier, a plurality of frames of the uplink channel or downlink channel being radio-communicated between one base station and a plurality of mobile stations.

Abstract: A transmitter codes data to be transferred, performs serial-parallel conversion of the data to two signal groups, and passes one of the groups to a first transmission unit and the other one to a second transmission unit. Each of the first transmission unit and the second transmission unit performs a prephasing process on each of signals included in the input signal group received, performs inverse Fourier transform thereon, and transmits the signal with a predetermined polarization. The polarity of the predetermined polarization of the first transmission is orthogonal to a polarity of the predetermined polarization of the second transmission unit.

Abstract: A coding section 201 of a transmitter receives an input of a transmitting signal and LDPC-codes the received signal, a serial-to-parallel conversion section 102 converts the coded signal from serial to parallel, and outputs m (m?2) intermediate signals, a unitary matrix modulation section 103 modulates the m intermediate signals to a unitary matrix of m rows and m columns where elements excepting diagonal elements are zero, and outputs an obtained matrix, a split section 111 supplies each of the diagonal elements of the matrix to each input channel of an inverse Fourier transform section 112 as an input signal, the inverse Fourier transform section 112 inversely Fourier transforms the input signals supplied to the input channels, and outputs the obtained m inversely Fourier transformed signals, a parallel-to-serial conversion section 113 converts the m inversely Fourier transformed signals from parallel to serial, and outputs one transmission signal, a transmitting section 114 transmits the output transmissio

Abstract: A communicating system is disclosed. The communicating system has a base station and a plurality of mobile stations that radio-communicate through an uplink channel and a downlink channel with frames each of which is composed of a plurality of time divided slots, each of the frames of the uplink channel and the downlink channel being transmitted in accordance with OFDM transmitting system. An OFDM sub carrier used in the OFDM transmitting system is divided in accordance with a predetermined diving method, each of the frames of the uplink channel or downlink channel being allocated to the divided portions of the OFDM sub carrier, a plurality of frames of the uplink channel or downlink channel being radio-communicated between one base station and a plurality of mobile stations.

Abstract: A serial-parallel converter 102 of a transmitter apparatus receives an input of a signal to be transmitted and serial-parallel-converts this to output m (m?2) number of intermediate signals. A unitary matrix modulator 103 modulates the output m number of intermediate signals into a unitary matrix of m rows and m columns whose components other than diagonal components are 0 and outputs the obtained matrix. A splitter 111 supplies the respective diagonal components of the output matrix to the input channels of an inverse Fourier transform unit 112 as input signals. The inverse Fourier transform unit 112 outputs m number of inverse-Fourier-transformed signals obtained by performing inverse Fourier transform of the supplied input signals. A parallel-serial converter 113 parallel-serial-converts the output m number of inverse-Fourier-transformed signals to output one transmission signal. A transmission unit 114 transmits the output transmission signal.