Patent application number | Description | Published |
20100183100 | RECEIVER AND RECEPTION METHOD - A receiver includes a propagation path estimation unit which produces a channel impulse response estimation value from a received signal, a replica signal creation unit which creates a replica signal as a replica of a transmitted signal based on the received signal, a time period setting unit which sets time periods into which the channel impulse response estimation value is divided, a received signal extraction unit which extracts received signals of the time periods set by the time period setting unit using the replica signal created by the replica signal creation unit, a combining unit which iterates a process for combining the signals of the time periods extracted by the received signal extraction unit, and a demodulation processing unit which performs a demodulation process for the signals combined by the combining unit. The number of time periods set in at least one iterative process is different. | 07-22-2010 |
20100195597 | TRANSMISSION APPARATUS, RECEPTION APPARATUS, COMMUNICATION SYSTEM AND TRANSMISSION METHOD - A transmission apparatus which communicates with a reception apparatus is provided. The transmission apparatus includes a transmission parameter control unit which sets a transmission parameter of at least one of the multiplex channels to be different from those of the other channels, and a transmission unit which transmits information indicating a signal detection order for the multiplex channels to the reception apparatus. | 08-05-2010 |
20100246553 | WIRELESS TRANSMISSION DEVICE, WIRELESS COMMUNICATION SYSTEM AND WIRELESS TRANSMISSION METHOD - A wireless transmission device which communicates with a wireless reception device, includes: a reception quality setting unit which sets the reception quality of at least one code channel among a plurality of code channels to be multiplexed to be different from the reception quality of the other code channels; and a transmitting unit which transmits a signal which has the reception quality set by the reception quality setting unit and is generated by multiplexing the plurality of code channels, to the wireless reception device. | 09-30-2010 |
20100325505 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD, AND COMMUNICATION METHOD - A communication device used in a communication system requesting a retransmission signal when detecting an error in a received initial transmission signal, the communication device including: a reception unit which receives the initial transmission signal and the retransmission signal; a synthesis unit which synthesizes a signal based on a retransmission signal and at least one of a signal based on the retransmission signal or the initial transmission signal, when the reception unit receives the retransmission signal; and an iterative detection and decoding unit which performs signal decoding based on a signal obtained through the synthesis in the synthesis unit, thereby reducing the number of retransmissions and the number of iterations of the iteration process. | 12-23-2010 |
20100325510 | TRANSMISSION DEVICE, RECEPTION DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - A reception device which communicates with a transmission device, the reception device including: a reception unit which receives a signal in which a plurality of data signals are multiplexed, from the transmission device; a data signal detection unit which detects transmission data included in the plurality of data signals from the reception signal received by the reception unit, and outputs the detected transmission data and success/failure of transmission data detection for each data signal; a selection unit which selects some of data signals for which the transmission data detection is not successful among the plurality of multiplexed data signals; a success/failure information signal generation unit which generates success/failure information in data signals for which the transmission data detection is successful and the selected data signals; and a report transmission unit which reports the success/failure information to the transmission device. | 12-23-2010 |
20100329368 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD, AND COMMUNICATION METHOD - A second communication device which communicates with a first communication device, the second communication device including: a reception unit which receives an initial transmission signal and at least one retransmission signal; and an iterative detection and decoding unit which performs iterative processes of signal detection and signal decoding for at least one received signal among received signals received by the reception unit, wherein the iterative detection and decoding unit includes: a combining unit which combines a result of signal detection obtained from at least one other received signal in one of the iterative processes. | 12-30-2010 |
20110019757 | COMMUNICATION SYSTEM, RECEPTION DEVICE, AND COMMUNICATION METHOD - A reception device which communicates with a transmission device including multiple transmission antennas, the reception device including: at least one reception antenna which receives multiple transmission signals transmitted by the transmission device from the multiple transmission antennas; a propagation channel response estimation unit which estimates propagation channel responses among the multiple transmission antennas and the reception antenna; a block division unit which divides a reception signal of at least one of the reception antennas into multiple blocks based on a multipath; and a transmission signal detection unit which detects the transmission signals transmitted by the transmission device based on the reception signal divided by the block division unit into the multiple blocks and the propagation channel responses estimated by the propagation channel response estimation unit. The transmission signal detection unit includes: an interference cancellation unit which generates and removes an interference replica; and a signal separation unit which separates a signal into which a transmission signal is multiplexed from an output of the interference cancellation unit. | 01-27-2011 |
20110038430 | TRANSMISSION APPARATUS, RECEPTION APPARATUS, COMMUNICATION SYSTEM, TRANSMISSION METHOD AND RECEPTION METHOD - Data errors are sufficiently corrected and desired transmission quality is obtained even when the time variation of fading is large in a multicarrier transmission scheme communication system to which HARQ is applied. A transmission apparatus | 02-17-2011 |
20110041023 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD, AND PROGRAM - A communication device in a communication system which requests a retransmission signal when an error is detected from an initial transmission signal detected from a reception signal, the communication device including: a storage unit which stores information indicated by the detected initial transmission signal; a reception unit which receives a signal including a desired signal; an a priori information generation unit which generates a priori information for detecting the desired signal from the signal received by the reception unit based on the information stored by the storage unit when a retransmission signal related to the initial transmission signal of the information stored by the storage unit interferes with the desired signal; and a signal detection unit which detects the desired signal from the signal received by the reception unit using the a priori information. Therefore, the number of retransmission is reduced. | 02-17-2011 |
20110044409 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD, AND PROGRAM - A communication device including: a reception unit which receives signals including an initial transmission signal and signals including retransmission signals for the same data; a signal detection unit which detects at least two signals among the initial transmission signal and the plurality of retransmission signals for the same data from the received signal using the result of a decoding process; a combining unit which combines at least two signals detected by the signal detection unit; and a decoding unit which obtains the result of the decoding process by decoding the combined signal; wherein the detection by the signal detection unit, the combining by the combining unit, and the decoding by the decoding unit are iteratively performed with respect to the plurality of signals for the same data. | 02-24-2011 |
20110066911 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD, AND COMMUNICATION METHOD - Provided is a communication device which performs a hybrid automatic repeat request process of requesting a transmission source to perform retransmission when an error is detected from a received signal. The communication device includes: a reception unit that receives a signal into which an initial transmission signal and a retransmission signal are multiplexed among signals including the initial transmission signal and the retransmission signal for any one signal; a detection order decision unit that decides an order of detection of the initial transmission signal and the retransmission signal from the signal received by the reception unit in response to the number of retransmissions of the initial transmission signal and the retransmission signal which are included in the signal received by the reception unit; and a signal detection unit that removes an interference component from the signal received by the reception unit by using a signal detected by the communication device according to the order decided by the detection order decision unit, and that detects the initial transmission signal and the retransmission signal. An increase of delay can be prevented when retransmission is repeated. | 03-17-2011 |
20110116581 | COMMUNICATION SYSTEM, RECEPTION DEVICE, AND COMMUNICATION METHOD - A reception device, which communicates with a transmission device having multiple transmission antennas, includes: at least one reception antenna which receives multiple transmission signals that are transmitted from the multiple transmission antennas by the transmission device; a Fourier transform unit which transforms the signals received by the reception antenna from a time domain into a frequency domain; a propagation channel estimating unit which calculates propagation channel estimation values by estimating propagation channels between the multiple transmission antennas and the reception antenna; and a signal detecting unit which detects the multiple transmission signals by dividing multipaths from the signals that are transformed into the frequency domain by the Fourier transform unit. | 05-19-2011 |
20110126072 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD AND COMMUNICATION METHOD - A communication device includes: a reception unit which receives a signal including an initial transmission signal and a retransmission signal for any one signal; a detection order determination unit which determines an order of detection of the initial transmission signal and the retransmission signal from the signal received by the reception unit, according to retransmission repetition numbers of the initial transmission signal and the retransmission signal; and a signal detection unit which detects signals including detected signals for the initial transmission signal and the retransmission signal from the signal received by the reception unit using signals detected by the communication device according to the order determined by the detection order determination unit. The signal detection unit includes a combining unit which combines the detected retransmission signal and a signal detected from a previously received signal including at least one related signal received earlier than the retransmission signal. | 05-26-2011 |
20110292984 | RECEIVER APPARATUS, COMMUNICATION SYSTEM, RECEPTION METHOD AND COMMUNICATION METHOD - A receiver apparatus | 12-01-2011 |
20110305286 | TRANSMISSION APPARATUS, TRANSMISSION METHOD, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - In a transmission apparatus which multicarrier-modulates and transmits symbols, which are basic units of digital signals, a subcarrier in which a symbol is arranged in a first multicarrier symbol having a first guard interval and a subcarrier in which a symbol is arranged in a second multicarrier symbol having a second guard interval longer than the first guard interval are scattered among a plurality of subcarriers constituting a multicarrier at the same time. Therefore, it is possible to improve the resistance to inter-symbol interference without substantially degrading transmission efficiency. | 12-15-2011 |
20110320920 | CODING APPARATUS, RECEIVING APPARATUS, WIRELESS COMMUNICATION SYSTEM, PUNCTURING PATTERN SELECTING METHOD AND PROGRAM THEREOF - By controlling to select encoding appropriately considering characteristics of equalization and decoding of a receiving apparatus employing a turbo equalization technology, it is possible to attain a high transmission characteristic. Information bits of two systems including a sequence which is input to a first RSC encoding unit | 12-29-2011 |
20120063532 | RECEPTION DEVICE, RECEIVING METHOD, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - The filtering unit ( | 03-15-2012 |
20120099679 | RECEIVING APPARATUS AND RECEIVING METHOD - A receiving apparatus and reception method reduces degradation due to multipath interference without increasing the amount of computation even in a system that has a large number of subcarriers. A signal detector, using the symbol replica generated by symbol replica generator and the channel estimate which a channel estimator estimated based on the received pilot signal, suppresses interference attributed to delayed waves exceeding the GI and outputs a suppressed signal for the received signal. A demodulator decodes the signal of which interference has been alleviated, to determine code bit LLR as bit likelihood information. A decoder performs an error correction decoding process on the input code bit LLR. If no error exists in the result of error correction decoding, the decoder outputs information bits to complete the reception process. If there is an error in the decoded result, the decoder outputs the code bit LLR to symbol replica generator. | 04-26-2012 |
20120243628 | RECEPTION DEVICE, RECEPTION METHOD, AND RECEPTION PROGRAM - A channel estimator estimates a channel estimation value. A symbol replica generator generates a symbol replica that is a modulation symbol of the information demodulated. A signal extractor extracts, in a plurality of time durations, each of subcarrier elements of the reception signal from which an interference is cancelled, based on the channel estimation and the symbol replica. A demodulator demodulates signals on the subcarrier elements of the reception signal, based on signals in the plurality of time durations which are extracted by the signal extractor. | 09-27-2012 |