| Patent application number | Description | Published |
|---|
| 20080279258 | WIRELESS COMMUNICATION SYSTEM AND FREQUENCY HOPPING METHOD THEREFOR, AND BASE STATION AND MOBILE STATION - In a wireless communication system, a control unit ( | 11-13-2008 |
| 20090003304 | Wireless communication system, base station, and wireless communication method - A wireless communication system comprising a base station and a terminal station. The base station extracts paths having a power level that exceeds a predetermined threshold value from delay profiles of said terminal station as available paths, selects a path having a maximum power or a first path from said available paths as a reference path, calculates time difference between an arrival time of said reference path and a predetermined maximum arrival time, and transmits the result to said terminal station as a transmission timing control signal. The terminal station adjusts the transmission timing to the base station according to said time difference. The base station transmits the transmission timing control signal only when the base station detects the reference path. | 01-01-2009 |
| 20090011717 | Mobile communication system and its signal transfer method - A mobile communication system and a signal transfer method, which use a signal having a preferred signal length from the implementation view point, are disclosed. The sending device sends a notify signal in which the time length is defined to be such a time that the number of samples when sampling at the sampling frequency becomes the product of the exponentiation of the predetermined number of prime numbers from the smaller number. The receiving device detects the notify signal by performing predetermined signal processing on the signal received from the sending device. | 01-08-2009 |
| 20090042512 | MOBILE COMMUNICATION SYSTEM, BASE STATION, AND INTER-CELL INTERFERENCE REDUCTION METHOD - Base stations ( | 02-12-2009 |
| 20090067476 | WIRELESS COMMUNICATION SYSTEM AND METHOD - Disclosed is a wireless communication system in which a mobile station transmits a plurality of reference signals upon placing the reference signals in temporally spaced-apart relation in at least one of information transmission units wirelessly transmitted in conformity with a hopping period, and a base station receives an information transmission unit that has been transmitted from the mobile station and, if this information transmission unit is one that includes a plurality of the reference signals, obtains a phase fluctuation from the plurality of reference signals and obtains a frequency deviation from the phase fluctuation. | 03-12-2009 |
| 20090068956 | Method and device for estimating reception quality in radio communication - A reception quality estimation device includes: a correlation extractor for extracting correlation between multiplexed reception reference signals received from the plurality of user terminals and a predetermined reference signal sequence, wherein extracted correlation corresponds to each user terminal; a received power calculator for calculating received signal power from the extracted correlation corresponding to each user terminal; a total received power calculator for calculating total received signal power by summing up the received signal power for all the plurality of user terminals; a noise power estimator for estimating noise power based on the total received signal power and total received power of multiplexed reception reference signals; and a reception quality calculator for calculating the reception quality of each user terminal based on the received signal power and the noise power. | 03-12-2009 |
| 20090232258 | DEVICE AND METHOD FOR DEMODULATING CONTROL SIGNALS - A device performs demodulation of control signals from multiple radio terminals, based on the correlations in the frequency domain between a predetermined code and the orthogonalized control signals and reference signals of the multiple radio terminals obtained by cyclic shifts of the predetermined code. The device includes: a demultiplexer which demultiplexes a reference signal component and a control signal component based on a correlation profile; a path detector which detects a path location or path locations for each radio terminal based on the power values of the reference signal components; extractor which extracts the correlation values of the reference signal components and the correlation values of the control signal components, respectively; and RAKE combiner which combines the extracted values. | 09-17-2009 |
| 20090280809 | WIRELESS COMMUNICATION SYSTEM, WIRELESS BASE STATION, AND WIRELESS COMMUNICATION METHOD - A signal transmitted from a terminal is received by plural adjacent wireless base stations ( | 11-12-2009 |
| 20090286485 | RADIO COMMUNICATION UNIT AND METHOD FOR CALCULATING FREQUENCY SHIFT - A radio communication unit includes: a reference-signal extraction section that extracts a phase of a reference signal from a baseband signal; a frequency-shift calculation section that calculates a phase shift of the received reference signal with respect to time, and calculates a frequency shift of the received carrier frequency; and an estimation-range decision section that determines, based on the calculated frequency shift, an estimation range used in the frequency-shift calculation section for estimating the frequency shift in a next slot. | 11-19-2009 |
| 20100172438 | TRANSMISSION SIGNAL GENERATING APPARATUS, METHOD, AND PROGRAM - Data multiplexing subcarrier identification signal generating means generates a data multiplexing subcarrier identification signal that identifies subcarriers with which data signals are to be multiplexed. Transmission signal generating means generates transmission signals by multiplexing data signals with subcarriers according to the data multiplexing subcarrier identification signal. Peak reducing transmission signal generating means generates peak reducing transmission signals by reducing peak power of the transmission signals according to peak reducing signals in a combination of a first peak reducing process in which subcarriers with which the data signals are not multiplexed are used for the peak reducing signals and subcarriers with which the data signals are multiplexed are not used for the peak reducing signals, and a second peak reducing process in which both subcarriers with which the data signals are not multiplexed and the subcarriers with which the data signals are multiplexed are used for the peak reducing signals. | 07-08-2010 |
| 20110002247 | SIGNAL MULTIPLEXING METHOD, SIGNAL DEMULTIPLEXING METHOD, DIGITAL SIGNAL REFERENCE FREQUENCY CORRECTION METHOD, MULTIPLEXING DEVICE, DEMULTIPLEXING DEVICE, RADIO COMMUNICATION SYSTEM, AND DIGITAL SIGNAL REFERENCE FREQUENCY CORRECTION DEVICE - A multiplexing/demultiplexing device has a phase difference detection part for detecting a phase difference from a reference frequency of a multiplexed signal and a reference frequency of each of input/output lines, an interpolation part for performing an interpolation on a digital transmitting/receiving signal of each of the input/output lines with a signal delayed by time corresponding to the phase difference for each of the input/output lines based on the phase difference detected by the phase difference detection part to obtain a digital transmitting/receiving signal sampled with the reference frequency of the multiplexed signal for each of the input/output lines, and a signal multiplexing/demultiplexing part for performing a multiplex/demultiplex of the digital transmitting/receiving signals of the input/output lines with use of the reference frequency of the multiplexed signal. | 01-06-2011 |
