Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Keiji Takakusaki

Shoji Miyamoto

Takaaki Kishigami

Yasuaki Yuda

Takashi Fukagawa

Mitsuru Uesugi

Atsushi Sumasu

Daichi Imamura

Katsuhiko Hiramatsu

Jinsong Duan

Keisuke Ebiko

Sadaki Futagi

Kazuyuki Miya

Daisuke Yamada

Hideki Yukitomo

Minako Ide

Genichiro Ohta

Genichiro Ota

Takao Nihei

A device for estimating a direction-of-arrival of a radio wave, the device comprising an array antenna including a plurality of antenna elements for receiving a high frequency signal, a demultiplexer for demultiplexing the received high frequency signal for each of the plurality of antenna elements to generate a plurality of frequency component signals and a direction estimating unit for estimating the direction-of-arrival of the radio wave by using two or more of the plurality of frequency component signals which are contiguous in a frequency direction.

Adaptive antenna radio communication device

A mobile terminal device for performing multi-carrier communication with a base station device can improve communication quality while reducing the data amount without lowering accuracy of feedback information. In the mobile station device (), a reception level measuring unit () measuring SINR as a reception level for each chunk formed by a plurality of sub-carriers according to a known signal; a control information transmission control unit () transmits feedback information (CQI information) based on the communication quality of each chunk to a base station device (); a relative value calculation unit () calculates a relative value of MCS corresponding to the reception level between adjacent chunks from the reception level of each chunk; and a CQI information generation unit () generates feedback information (CQI information) from an absolute value of MCS corresponding to the reception level of the reference chunk and a relative value of MCS corresponding to the reception level between the adjacent chunks.

Mobile station apparatus, communication method, and base station apparatus

Mobile station device

A modulation apparatus is disclosed that enables significant improvements in signal transmission rate in a limited frequency band as compared with conventional modulation schemes. The modulation apparatus has first and second frequency-increasing single side band (SSB) modulators. The modulators are configured to have respective carrier frequencies with a difference by a frequency corresponding to the symbol frequency (i.e. fundamental frequency of the input symbol). An adder combines a lower side band (LSB) signal obtained from the SSB modulator set for a higher carrier frequency, and an upper side band (USB) signal obtained from the SSB modulator set for a lower carrier frequency to obtain a modulation signal.

Modulation device, demodulation device, modulation method and demodulation method

An adaptive antenna radio communication device comprises a divided band direction estimating unit for estimating the direction by calculating the cross correlations between a pilot signal and sub-carrier signals of the respective divided bands received by an array antenna and calculating a spatial profile from correlation matrices determined by combining the correlation values between antenna elements of the different sub-carriers according to the output of the cross correlation calculation; a divided band array weight creating unit for creating a weight of a receive array having a directional beam in the direction of estimation for each divided band; and a sub-carrier directivity creating unit for creating a directivity by multiplication-combining the created receive array weight with the corresponding sub-carrier signal.

A modulating device capable of generating an OFDM signal and having a drastically improved frequency use efficiency. The modulating device has modulators (()) for modulating a signal to be modulated and having a Nyquist roll-off frequency characteristic with a carrier frequency having a difference two times the Nyquist frequency and combiners (()) for generating modulation output having a speed two times that of the signal to demodulated and the same Nyquist roll-off slope as the signal to be modulated by combining the outputs of the modulators (()). Thus a double speed wave can be superposed on the same frequency without varying the roll-off slope of the Nyquist characteristic, and therefore an OFDM signal () having a drastically improved frequency use efficiency is provided.

Modulation apparatus, modulation method, and demodulation apparatus

A transmission weight computing section computes a transmission weight for directional transmission using an OFDM signal. A transmission correcting value memory section stores one correcting value for correcting the transmission weight for each sub-carrier of an OFDM signal or each band gathering a plurality of sub-carriers. A transmission weight correcting section corrects the transmission weight by the correcting value. A transmitting branch weights transmission data by a transmission weight outputted from the transmission weight correcting section on a sub-carrier-by-sub-carrier basis and delivers it to an antenna.

Radio base station apparatus

An apparatus that can lower the possibility of failing reception modulation in communication where data is transmitted with and without directivity and prevent deterioration of transmission efficiency caused by retransmission. With this apparatus, a gain control signal multiplex section () time division multiplexes a directional transmission signal and a gain control signal. A transmission level control section () controls the transmission power level of a gain control signal so that the transmission power level of the gain control signal is smaller than the transmission power level of a directional transmission signal and the received power level of the gain control signal is larger than a received power level of a nondirectional transmission signal at the receiving side, and controls the transmission power level of a directional transmission signal so that the received power level of the directional transmission signal is larger than the received power level of a nondirectional transmission signal and the received power level of a gain control signal at the receiving side.

Transmission device and gain control method

An adaptive antenna radio communication device comprises a divided band direction estimating unit () for estimating the direction by calculating the cross correlations between a pilot signal and sub-carrier signals of the respective divided bands received by an array antenna () and calculating a spatial profile from correlation matrices determined by combining the correlation values between antenna elements of the different sub-carriers according to the output of the cross correlation calculation; a divided band array weight creating unit () for creating a weight of a receive array having a directional beam in the direction of estimation for each divided band; and a sub-carrier directivity creating unit () for creating a directivity by multiplication-combining the created receive array weight with the corresponding sub-carrier signal.

A radio communication apparatus using an array antenna has a plurality of reception branches for conveying reception signals received at the antenna element of the array antenna, and a calibration branch for selecting one of the plurality of reception branches and conveying the reception signal. Channel estimations are made respectively on the reception-branch signals and a calibration-branch signal. RAKE composition is made on the channel estimation values, a result of which is used to detect amplitude and phase deviations on the reception branch thereby carrying out a correction.

Radio communication apparatus

A path search circuit according to the present invention has an orthogonal multi-beam forming sectionfor directional reception with a plurality of orthogonal multi-beams orthogonal one to another, correlation-operating sectionsM for correlation-operating outputs of the orthogonal multi-beam forming sectionwith a known signal, weight multiplying sectionsNb for multiplying the output of the correlation-operating sectionM by a weight converted into a beam space, delay profile generating sectionsNb for generating delay profiles from the output signals of the weight multiplying sectionsNb, and a path detecting sectionfor detecting a reception timing and arrival direction of arrival path from the delay profile. This path search circuit can enhance the accuracy of path direction detection by the use of a directional reception signal, and further reduce the direction dependence of path timing detection accuracy.

Path search circuit, radio receiver and radio transmitter, utilizing a directional beam

Baseband signal generatoroutputs a transmission baseband signal with a coefficient for setting antenna directivity multiplied and a gain control signal to transmit power amplifierand transmit power amplifieramplifies the transmission baseband signal with a gain corresponding to the gain control signal and transmits the signal from antenna. ATTattenuates the output signal of amplifieraccording to the gain control signal, amplitude/phase comparatorcalculates amplitude and phase errors between the attenuated signal with a frequency equalized by frequency conversion sectionsandand the input signal of amplifierand phase/amplitude correction sectioncorrects the transmission baseband signal and gain control signal so as to eliminate the errors. This makes it possible to correct the amplitude and phase shifts of the transmission signal during a communication with other apparatuses and reduce the size and cost of the apparatus.

Communication apparatus and communication method

A reception radio circuit and a reception radio circuit receive radio communication signals from a mobile station and calibration signals from a CAL-CDMA radio signal transmission section through respective a reception antenna and a reception antenna , followed by performing down-conversion of received signals. A reception CDMA signal processing section B (for CAL) measures characteristic errors of respective reception radio circuits while observing the calibration signals undergoing down-conversion, before holding the measured characteristic errors in a compensation table of a recorder . A reception CDMA signal processing section A (for communication) performs CDMA demodulation processing of radio communication signals from the mobile station , which signals are subjected to the down-conversion, at the same time as observing operation of the reception CDMA signal processing section B (for CAL) , on the basis of the characteristic errors held in the compensation table.

Array-antenna radio communication apparatus

The array antenna radio communication apparatus of the present invention combines the outputs of calibration desired signal generator and calibration interference signal generator using combination section When changing the power of the combined calibration signal, it fixes the power of calibration desired signal to avoid phase rotations due to the power control section and changes only the power of the calibration interference signal by power control section. The array antenna radio communication apparatus supplies this combined calibration signal to a plurality of radio circuits simultaneously or alternately and performs reception processing on only the calibration desired signal by received signal processing section and measures reception characteristics.

Array antenna radio communication apparatus

Received signal provided via plural antennas,are memorized in memory,. First weight controller,calculates the first weights by which the received signals are weighted, and second weight controller,calculates the second weights using the received signals. Multipliers,and,multiply the memorized received signals by the first weights, while multiply the memorized received signals by the second weights when a channel quality of radio signals deteriorates due to a change of the radio signal's direction of arrival Adder,synthesizes the multiplication results. Propagation path distortion compensator,estimates a deterioration of the channel quality using synthesis result to compensate. Detector,detects the compensation result that is used as a parameter to calculate the first and second weights, which allows the apparatus to receive radio signals without deteriorating reception qualities when the channel quality deteriorates rapidly due to the change of the radio signal's direction of arrival.

Growing community of inventors

Kanagawa, Japan

Keiji Takakusaki