Patent application number | Description | Published |
20080267320 | Communication device and channel estimation method - A communication apparatus and a channel estimating method for performing channel estimations with high precision. The communication apparatus, which receives multicarrier signals comprising a plurality of subcarriers, has a first estimating unit that generates temporary channel estimation values from pilot signals located in any ones of a plurality of received subcarriers; a second estimating unit that generates a virtual channel estimation value sequence related to the frequency bands other than the frequency bands of the plurality of subcarriers and that combines the generated virtual channel estimation value sequence with the plurality of temporary channel estimation values to generate a channel estimation value sequence corresponding to a predetermined frequency bandwidth; and a generating unit that uses this generated channel estimation value sequence to generate channel estimation values related to any ones of the plurality of subcarriers. | 10-30-2008 |
20080268782 | Receiving device and communication system - A receiving device and a communication system wherein the frequency usage efficiency is raised to improve the communication throughput. The receiving device comprises a receiving unit that receives multicarrier signals in which a plurality of subcarriers are divided into a plurality of subcarrier blocks (frequency blocks) each including at least one subcarrier and in which signals to be transmitted to receiving devices are allocated on a subcarrier block basis; an estimating unit that estimates, for each of the subcarrier blocks, quality values indicative of the reception statuses of the signals allocated to the plurality of subcarrier blocks; and a notifying unit that notifies a transmitting device of information indicative of a high quality subcarrier block having a high quality value in the quality values, a quality value in the high quality subcarrier block, and an interval of the subcarrier blocks having the quality value of which a difference from the quality value in the high-quality subcarrier block falls within a predetermined threshold value. | 10-30-2008 |
20080293398 | TRANSMISSION PROCESSING METHOD IN MOBILE COMMUNICATIONS SYSTEM AND BASE STATION - In a case where multiple kinds of frames having different lengths (Ngi_s and Ngi_l) of guard intervals inserted before the head of the effective data, the length of the guard intervals are adjusted in such a manner that at least the position of a part of the effective data is are apart from frame timing by the same amount. Thereby, on the receiving end, it is always possible to perform reception processing such as FFT processing in an appropriate time division at a fixed timing, without causing sample deviation of the effective data. | 11-27-2008 |
20080304446 | Frequency division communication system - An orthogonal frequency division communication system which enables flexible modification of the ratio of allocation between uplink and downlink transmissions, while maintaining advantages similar to those of TDD (Time Division Duplex) systems, has a base station and a plurality of mobile stations connected by uplinks and downlinks, and a plurality of mutually orthogonal frequencies are allocated, on the frequency axis and on the time axis, to the uplinks and downlinks and to the plurality of mobile stations. | 12-11-2008 |
20090004971 | RADIO COMMUNICATIONS METHOD, TRANSMITTER, AND RECEIVER - The transmitter transmits at least any one of the multiple kinds of generated pilot signals corresponding to the multiple types of communications services by use of a predetermined band set in a part of a transmission band beforehand, and transmits the other kinds of pilot signals using parts of the transmission band other than the predetermined band. The receiver detects a signal in a band containing at least the predetermined band, out of reception signals from the transmitter, and detects the pilot signal from the detected signal. With this construction, even if other pilot signals are frequency-division multiplexed to the same time domain, the receiver is capable of detecting a pilot signal accurately while avoiding the effect of interference due to the other pilot signals. | 01-01-2009 |
20090141841 | INTERFERENCE NOISE ESTIMATION METHOD, RECEPTION PROCESSING METHOD, INTERFERENCE NOISE ESTIMATION APPARATUS, AND RECEIVER, IN MULTICARRIER COMMUNICATIONS SYSTEM - To make it possible to estimate interference noise power with high accuracy even when channel variations are present in the frequency domain and the time domain, average values between pilot signals received at different timing and at different frequencies are obtained and interference noise is estimated based on a difference between the average values. | 06-04-2009 |
20090168811 | METHOD OF SIGNAL MULTIPLEXING AND TRANSMITTER IN RADIO COMMUNICATION SYSTEM - A transmitter time-division-multiplexes, in time domain, to assign at least a part of a second signal stream of a second channel being relatively high error-resilient compared to a first signal stream of a first channel between a boundary of the blocks and the first signal stream of the first channel of a time-division-multiplexing signal. | 07-02-2009 |
20090262712 | TRANSMITTING AND RECEIVING DEVICES IN CELLULAR SYSTEM - In a multi-carrier cellular system, a second synchronization code (a Walsh code or a GCL series code) mapped on a second synchronization channel is used as a signal for specifying in which cell of the base station a mobile station terminal device itself is. A signal transmitted from the base station to the mobile station terminal device is mapped in a radio frame having two-dimensional extension in frequency and time directions. When mapping a certain series number of the second code for specifying a cell or a cell group on the radio frame as the second synchronization channel, phase rotation or circular shift in which one radio frame is one cycle is applied to the second synchronization code. On the receiving side, the head timing of the radio frame is known by knowing the phase rotation angle or the amount of circular shift of the second synchronization code. | 10-22-2009 |
20100124299 | METHOD FOR MIMO DECODING, APPARATUS FOR MIMO DECODING, AND MIMO RECEIVER - There is provided a method for MIMO decoding, based on a channel estimated value between a plurality of transmitting antennas and a plurality of receiving antennas, a received signal received by the plurality of receiving antennas, including: in obtaining a unitary matrix Q and a triangular matrix R through QR decomposition of a channel estimated value matrix H, creating the triangular matrix R such that a sum of scalars of non-diagonal elements of the triangular matrix R is the minimum; and estimating a signal transmitted from the plurality of transmitting antennas through the use of the created triangular matrix R, the unitary matrix Q, and the received signal received by the plurality of receiving antennas. | 05-20-2010 |
20110092166 | Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information. | 04-21-2011 |
20110111702 | Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information. | 05-12-2011 |
20110117857 | Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information. | 05-19-2011 |
20110135029 | TRANSMITTER, TRANSMISSION METHOD, RECEIVER, AND RECEPTION METHOD - Multi-level modulation is performed with a signal point constellation in which any three adjacent signal points on a phase plane form an equilateral triangle and at least a distance between a signal point closest to the origin of the phase plane and the origin is increased within a range that the transmission mean power remains unchanged. | 06-09-2011 |
20110136440 | Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information. | 06-09-2011 |
20110143681 | Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information. | 06-16-2011 |
20110165852 | Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information. | 07-07-2011 |
20110199995 | BASE STATION, TERMINAL DEVICE, CONTROL CHANNEL ASSIGNMENT METHOD AND REGION SIZE DETERMINATION METHOD - In a base station that performs radio data communication with terminal devices by using a plurality of bands of which each has a data channel region to which a data channel is assigned and a control channel region to which a control channel is assigned, the base station includes a control channel assigning unit that assigns a control channel for the terminal device at a location corresponding to a band to which a data channel assigned to the terminal device belongs, in the control channel region of any band of the plurality of bands, and a control channel transmitting unit that transmits the control channel to the terminal device at the location assigned by the control channel assigning unit. | 08-18-2011 |
20110243265 | WIRELESS COMMUNICATION SYSTEM - A wireless communication system is disclosed including a MIMO wireless communication apparatus that can communicate through multiple antennas and a non-MIMO wireless communication apparatus that can communicate through a single antenna or multiple antennas. The MIMO wireless communication apparatus includes a communication unit configured to transmit and receive control information divided into a second control information containing information related to the demodulation and decoding of traffic channel and a first control information containing information related to the MIMO separation of the second control information. | 10-06-2011 |
20110249665 | COMMUNICATION APPARATUS, MOBILE STATION, AND COMMUNICATION CONTROL METHOD - A radio communication system including a communication apparatus can transmit signals each including same data from a transmission antenna and a transmission antenna to a mobile station. The mobile station measures a difference in receiving timing between the signal from the transmission antenna and the signal from the transmission antenna. The communication apparatus exercises control so as to change at least one of transmission timing of the signal from the transmission antenna and transmission timing of the signal from the transmission antenna according to the difference in receiving timing at the mobile station. | 10-13-2011 |
20110255584 | DEVICE, CHANNEL QUALITY ESTIMATION METHOD, AND TRANSMISSION METHOD - A mobile device includes a first receiving unit that receives a dedicated pilot signal included in a dedicated pilot signal part of a data unit that is transmitted from a base station to the self-device, an second receiving unit that receives a signal included in a dedicated pilot signal part of a data unit that is transmitted from the base station to the other device other than the self-device, a CQI generating unit that estimates a channel quality indicator that indicates a reception environment when the self-device receives data on the basis of the dedicated pilot signal received by the first receiving unit and the signal received by the second receiving unit, and a radio unit that transmits the channel quality indicator estimated by the CQI generating unit to the base station. Therefore, the present invention can contribute to the assignment optimization of a radio resource of the base station. | 10-20-2011 |
20110320098 | TRANSMISSION POWER CONTROL PARAMETER CALCULATION METHOD AND DEVICE - A cubic metric calculator performs a calculation of a time average of power of the amplitude of a transmission signal when a cubic metric value is calculated as a product-sum operation between a transmission power-dependent term including an amplitude value depending on the transmission power of a transmission signal and a time average term including only a modulation parameter not depending on the transmission power of the transmission signal. When the transmission signal is transmitted, the operator inputs the amplitude value to calculate the transmission power-dependent term, reads the value of the time average term from coefficient memory, and performs the product-sum operation using an operation result of the transmission power-dependent term and the read value of the time average term, thereby calculating a time average of the power of the amplitude of the transmission signal. | 12-29-2011 |
20120002657 | RADIO COMMUNICATION SYSTEM, MOBILE STATION APPARATUS, BASE STATION APPARATUS, AND RADIO COMMUNICATION METHOD IN RADIO COMMUNICATION SYSTEM - A radio communication system including: a base station apparatus; and a mobile station apparatus, the mobile station apparatus includes: a receiver which receives data signal transmitted from the base station apparatus; a controller which switches a unit of grouping to the data signal and groups the data signal, according to one parameter or a combination of a plurality of parameters out of a type of a channel, a type of modulation scheme and encoding rate, an assigned resource amount, or a number of transmitting antennas of the mobile station apparatus, when an ACK signal or an NACK signal to the data signal is transmitted; and a transmitter which transmits the ACK signal or the NACK signal in each the group, and the base station apparatus includes: a transmitter which transmits the data signal; and a receiver which receives the ACK signal or the NACK signal. | 01-05-2012 |
20120008700 | RADIO COMMUNICATION SYSTEM, TRANSMISSION APPARATUS, RECEPTION APPARATUS, AND RADIO COMMUNICATION METHOD IN RADIO COMMUNICATION SYSTEM - A radio communication system, including: a transmission apparatus; and a reception apparatus, wherein the transmission apparatus and reception apparatus performs a radio communication, the transmission apparatus includes: one or more processor configured to enlarge a sequence length of a transmission data by repeating a sequence of the transmission data, and to perform a first subcarrier arrangement to arrange each of components included in the enlarged transmission data to each of subcarrier according to positions of the each of components in the enlarged transmission data, and to puncture the component of the arranged transmission data, when the subcarrier is not used for transmission; and a transmitter which transmits the transmission data arranged on the subcarrier to the reception apparatus, and the reception apparatus includes a receiver which receives the transmission data. | 01-12-2012 |
20120044923 | MOBILE WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION APPARATUS - A mobile wireless communication system including a wireless communication apparatus and a counterpart wireless communication apparatus is provided, the system establishing wireless communication between the wireless communication apparatus and the counterpart wireless communication apparatus by multiplexing plural channels including at least a traffic channel for transmitting a packet, a control channel for transmitting control information for receiving the packet, and a channel for transmitting information including transmission power control information. The wireless communication apparatus includes a transmission unit that transmits the transmission control information to the counterpart wireless communication apparatus via the channel for transmitting information including transmission power control information at intervals of a prescribed period that is longer than a length of the packet, and transmits the transmission power control information via the control channel when the packet is being transmitted via the traffic channel. | 02-23-2012 |
20120163482 | COMMUNICATION METHOD, COMMUNICATION SYSTEM, TRANSMISSION DEVICE, AND RECEIVING DEVICE - A communication method of transmitting plural packets from a first communication device to a second communication device includes associating identification information items with combinations of reception results of the plural packets in the second communication device, specifying one of the identification information items based on the reception results of the plural packets in initial reception, and transmitting the one item to the first communication device; determining an encoding method and encoding the plural packets based on the determined encoding method, and retransmitting the encoded packets to the second communication device; and decoding the encoded packets based on successfully received packets and reproducing incorrectly received packets in the initial reception. | 06-28-2012 |
20120196634 | WIRELESS COMMUNICATION SYSTEM, MOBILE TERMINAL AND COLLABORATIVE COMMUNICATION METHOD - A first base station receives from a mobile terminal identification information indicating a combination of a weight coefficient for the first base station and a weight coefficient for a second base station, transfers the received identification information to the second base station, and performs precoding of a data signal to be transmitted to the mobile terminal by collaborative transmission, by using the weight coefficient for the first base station identified by means of latest identification information. The second base station receives the identification information from the first base station, and performs precoding of a data signal to be transmitted by collaborative transmission, by using the weight coefficient for the second base station identified by means of identification information obtained as latest identification information and different from that for the weight coefficient for the first base station used for precoding of the data signal. | 08-02-2012 |
20120307763 | WIRELESS COMMUNICATION SYSTEM - A wireless communication system is disclosed including a MIMO wireless communication apparatus that can communicate through multiple antennas and a non-MIMO wireless communication apparatus that can communicate through a single antenna or multiple antennas. The MIMO wireless communication apparatus includes a communication unit configured to transmit and receive control information divided into a second control information containing information related to the demodulation and decoding of traffic channel and a first control information containing information related to the MIMO separation of the second control information. | 12-06-2012 |
20130039435 | WIRELESS COMMUNICATION SYSTEM - A wireless communication method used by a wireless communication apparatus is disclosed. The wireless communication method transmits and receives control information divided into a second control information containing information related to the demodulation and decoding of traffic channel and a first control information containing information related to the MIMO separation of the second control information. | 02-14-2013 |
20130157583 | Radio Channel Control Method And Receiving Apparatus - A radio channel control method for controlling, in a radio communication system having a transmitter and a receiver, a radio channel from the transmitter toward the receiver. The method includes receiving a signal transmitted from the transmitter by the receiver, measuring reception quality of the signal, generating information which indicates increment or decrement of the reception quality, and controlling a modulation or coding for the radio channel based on the information. | 06-20-2013 |
20130343361 | METHOD OF SIGNAL MULTIPLEXING AND TRANSMITTER IN RADIO COMMUNICATION SYSTEM - A transmitter time-division-multiplexes, in time domain, to assign at least a part of a second signal stream of a second channel being relatively high error-resilient compared to a first signal stream of a first channel between a boundary of the blocks and the first signal stream of the first channel of a time-division-multiplexing signal. | 12-26-2013 |