Abstract: A transmitting device and a receiving device wherein, on the transmitting side, a signal creation unit creates, as its output, a signal generated adding up the signals assuming that different data has passed through multiple virtual channels and, on the receiving side, oversampling is performed, the sampled data is distributed, and signals are detected assuming that the distributed data is the output of multiple virtual reception antennas.

Abstract: A transmitting device and a receiving device wherein, on the transmitting side, a signal creation unit creates, as its output, a signal generated adding up the signals assuming that different data has passed through multiple virtual channels and, on the receiving side, oversampling is performed, the sampled data is distributed, and signals are detected assuming that the distributed data is the output of multiple virtual reception antennas.

Abstract: A transmitting device and a receiving device wherein, on the transmitting side, a signal creation unit creates, as its output, a signal generated adding up the signals assuming that different data has passed through multiple virtual channels and, on the receiving side, oversampling is performed, the sampled data is distributed, and signals are detected assuming that the distributed data is the output of multiple virtual reception antennas.

Abstract: A transmitting device and a receiving device wherein, on the transmitting side, a signal creation unit creates, as its output, a signal generated adding up the signals assuming that different data has passed through multiple virtual channels and, on the receiving side, oversampling is performed, the sampled data is distributed, and signals are detected assuming that the distributed data is the output of multiple virtual reception antennas.

Abstract: A transmitting device and a receiving device wherein, on the transmitting side, a signal creation unit creates, as its output, a signal generated adding up the signals assuming that different data has passed through multiple virtual channels and, on the receiving side, oversampling is performed, the sampled data is distributed, and signals are detected assuming that the distributed data is the output of multiple virtual reception antennas.

Abstract: A parallel sampling device includes a memory that stores the values of the sampling function (Sin ?t/?t), a low pass filter, a sampler that samples a signal, which has passed through low pass filter, at a sampling period of Ts, and a parallel sampler provided in a stage following the sampler. The parallel sampler generates parallel sampled values at an interval of the sampling period Ts/N (N is a natural number equal to or larger than 2) based on sampled values obtained by the sampler and the values of the sampling function stored in the memory. This configuration allows parallel sampling to be performed easily even if the frequency is high or the sampling period of parallel sampling is narrow.

Abstract: A spectrum spread communication method includes a step of generating a data block formed by a plurality of M bits of transmission data in the CDMA communication method, a step of modulating an orthogonal sinusoidal wave by the repeated series of the data block to generate a spread symbol, a step of transmitting the symbol, a step of performing reverse spread of the reception input by using the orthogonal sinusoidal wave, thereby completely isolating the multi-user component including the multi rate.

Abstract: A de-correlating discriminating system of code division multiple access signals including a system structure composed of a plurality of cells, each of the plurality of cells including a base-station and a plurality of user-stations, each of the user-stations including a user-transmitter and a user-receiver, communicating through a multi-access channel with the base station which includes a base-station receiver and a base-station transmitter, and the user-transmitter is capable of transmitting a data symbol to convey a data with a spreading sequence and a pilot symbol that is the spreading sequence to identify a channel from the user transmitter to the base-station receiver and the base-station receiver includes a minimum means square error detector to analyze an input vector that is a received signal containing both multiple users specific data responses.

Abstract: A parallel sampling device comprises a memory that stores the values of the sampling function (Sin ?t/?t), a low pass filter, sampling means that samples a signal, which has passed through low pass filter, at a sampling period of Ts, and parallel sampling means provided in a stage following the sampling means. The parallel sampling means generates parallel sampled values at an interval of the sampling period Ts/N(N is a natural number equal to or larger than 2) based on sampled values obtained by the sampling means and the values of the sampling function stored in the memory. This configuration allows parallel sampling to be performed easily even if the frequency is high or the sampling period of parallel sampling is narrow.

Abstract: In a communication method for transmitting a multipath characteristic measurement signal and a plurality of data transmission signals, the multipath characteristic measurement signal and data transmission signals are a signal array formed by a plurality of coefficient matrices that are orthogonal to one another within the matrices and which comprise at least one coefficient array that is common in the column direction or row direction. The multipath characteristic measurement signal formed by the coefficient matrices is the same signal array formed by the one common coefficient array.

Abstract: A transmitting device and a receiving device wherein, on the transmitting side, a signal creation unit creates, as its output, a signal generated adding up the signals assuming that different data has passed through multiple virtual channels and, on the receiving side, oversampling is performed, the sampled data is distributed, and signals are detected assuming that the distributed data is the output of multiple virtual reception antennas.

Abstract: In a transmitting/receiving method, a transmitter device transmits a vertical polarization signal and a horizontal polarization signal, and a receiver device receives the vertical and horizontal polarization signals transmitted by the transmitter device. The vertical polarization signal includes a vertical polarization ID signal which identifies vertical polarization and a vertical polarization data signal which is a data signal. The horizontal polarization signal includes a horizontal polarization ID signal which identifies horizontal polarization and a horizontal polarization data signal which is a data signal. The vertical polarization ID signal and the horizontal polarization ID signal are transmitted simultaneously. The vertical polarization ID signal, the horizontal polarization ID signal, and the vertical polarization data signal are generated from signal sequences having orthogonal correlation.

Abstract: here is provided a new multi-user receiver configuration technique which solves the problems of the user signal separation function of the multi-user receiver such as the interference canceller, decorrelator, and least square error detection. That is, there is provided a code-division multiplex signal decorrelation/identification method for realizing much more excellent performance than the aforementioned methods in the aspect of the power band amplitude product required for one-bit transfer as the evaluation reference of the CDMA method. A function for successively judging the best user is added to the conventional least square error detector MMSE-D shown by a dotted line in the block diagram of the successive detection type least square error detection method (SD-MMSE).

Abstract: A wireless communication system includes plural wireless communication apparatuses. Each wireless communication apparatus includes a transmitter 10 including a spread unit 14 for spreading a transmission sequence to be transmitted with a predetermined spread sequence, a pseudo periodic sequence generating unit 13 for generating a periodic sequence in which the transmission sequence to be transmitted is repeated a predetermined number of times, and a modulating unit 15 for modulating, with a carrier frequency, the transmission sequence to be transmitted. Each wireless communication apparatus includes a receiver 20 including a demodulating unit 22 configured to demodulate a reception wave modulated with the carrier frequency and a despreading unit 27 for despreading the spread signal sequence. The transmission sequence to be transmitted includes a pilot signal used for measuring multipath properties and a transmission data signal.

Abstract: A data communication system and a data transmitting apparatus with improved noise immunity are disclosed. The data communication system includes an orthogonal transforming unit using an N times N orthogonal matrix; a signal transforming unit; a transmitting unit; a receiving unit; a signal inverse-transforming unit; and an orthogonal inverse-transforming unit.

Abstract: This invention provides techniques for a CDMA system having high spectrum efficiency with low transmit power. Each transmitter comprises means of selecting some core-sequences out of multiple sequences to make them convey plural data, means of producing an enveloped selected sequence with such a method as to arrange as guard sequences to a repeated sequence made by repeating each of the selected core-sequences, means of modulating a user specific orthogonal carrier frequency by the enveloped selected sequence to produce a transmit-symbol, and means of transmitting the transmit-symbols. And a receiver comprises means of demodulating a receive-symbol with one of the user specific carrier frequencies to produce a base-band receive-symbol, means of separating respective components corresponding to the sequences selected by the user, by analyzing the base-band receive-symbol with a matrix composed of a channel response vector from the user to the receiver to detect plural data on the components.

Abstract: In a communication method for transmitting a multipath characteristic measurement signal and a plurality of data transmission signals, the multipath characteristic measurement signal and data transmission signals are a signal array formed by a plurality of coefficient matrices that are orthogonal to one another within the matrices and which comprise at least one coefficient array that is common in the column direction or row direction. The multipath characteristic measurement signal formed by the coefficient matrices is the same signal array formed by the one common coefficient array.

Abstract: When transmission data is modulated via spread spectrum, not a spreading sequence itself but a transmission data sequence is processed to make the periodic spectrum of a transmission signal a non-correlated spectrum to reduce an increase in the amplitude of the signal and to reduce the dynamic range of an amplifier on a receiving side. A transmission signal production method comprises the steps of multiplying the transmission data by the coefficients of a predetermined coefficient sequence to produce a plurality of transmission data; and adding 0 data of a predetermined length between the plurality of transmission data, produced by multiplying the transmission data by the coefficients, to produce a transmission data sequence.

Abstract: A direct sequence spread spectrum system consisting of modulator and demodulator wherein the spreading sequence with zero correlation zone properties, and the despreading consists of multiplying the received signal with the same spreading sequence, followed by a low pass filter, decoder and deinterleaver. The bit rate of the spreading sequence for each user is normally much higher than the input encoded data bit rate, and therefore it spreads the system spectrum.

Abstract: A coefficient sequence of a spreading sequence is sequentially shifted one pitch at a time, transmission data is multiplied by a plurality of coefficient sequences to produce a plurality of transmission data, and the plurality of produced transmission data are added up to produce a transmission data sequence. Alternatively, the coefficient sequence of the spreading sequence is multiplied by the transmission data, the result is sequentially shifted one pitch at a time, and a plurality of transmission data are added up to produce a transmission data sequence. Transmission data is multiplied by the coefficient sequence of a spreading sequence to produce a finite-length signal and this finite-length signal is repeated an infinite number of times to produce an infinite-length signal. Transmission data, which is longer than the coefficient sequence, is cut out from this infinite-length signal to produce a transmission data sequence.