摘要:
An order-ensemble searching unit classifies a distribution of reception signals at each bit position of a modulation symbol, and searches an order ensemble of a parity check matrix that minimizes an SNR threshold value. A code generating unit generates a parity check matrix and a generation matrix, based on the order ensemble obtained as a search result.
摘要:
An order-ensemble searching unit classifies a distribution of reception signals at each bit position of a modulation symbol, and searches an order ensemble of a parity check matrix that minimizes an SNR threshold value. A code generating unit generates a parity check matrix and a generation matrix, based on the order ensemble obtained as a search result.
摘要:
When an error correction decoding unit 26 of a data reception device 2 fails in error correction decoding of a codeword, an MIMO processing unit 15 of a data transmission device 1 deforms transmitted codewords according to a predetermined rule, and transmits the codewords, and the error correction decoding unit 26 of the data reception device 2 reproduces data by using the deformed codewords. As a result, not only the noise but the interference wave components can be reduced, and the success rates of the demodulation and error correction decoding can be improved greatly.
摘要:
When an error correction decoding unit 26 of a data reception device 2 fails in error correction decoding of a codeword, an MIMO processing unit 15 of a data transmission device 1 deforms transmitted codewords according to a predetermined rule, and transmits the codewords, and the error correction decoding unit 26 of the data reception device 2 reproduces data by using the deformed codewords. As a result, not only the noise but the interference wave components can be reduced, and the success rates of the demodulation and error correction decoding can be improved greatly.
摘要:
Within a communication system in which an ARQ control is exercised, in a transmission-side communication apparatus 11, a transmission scheduling unit 113 determines a transmission amount to be transmitted to a reception-side communication apparatus 21; an erasure correction encoding unit 112 performs an erasure correction encoding process on an information packet group that is made up of a plurality of packets to be transmitted so as to generate one or more erasure correction coded packets that fit the transmission amount instructed by the transmission scheduling unit 113 and specifies the one or more erasure correction coded packets as a unit of delivery confirmation; and a modulating unit 115 transmits a transmission data signal that has been generated by performing a predetermined modulation process on each of the erasure correction coded packets. In the reception-side communication apparatus 21, an erasure correction decoding unit 213 generates the information packet group by performing an erasure correction decoding process on the received signal and also generates, in the case where the erasure correction decoding process has successfully been performed, a delivery confirmation signal for each unit of delivery confirmation, the delivery confirmation signal indicating that reception of the transmission data signal has been completed, so that the generated delivery confirmation signal is transmitted to the transmission-side communication apparatus 11.
摘要:
A method selects antennas in an OFDMA wireless network including a base station and a mobile station. The mobile station measures a channel state of a downlink in a downlink subframe using different subsets of available antennas, and selects a subset of receive antennas for downlink reception based on the channel states between the base station and the different subsets of antennas at the mobile station. The base station measures the channel state in an uplink using an uplink subframe received in the base station from the mobile station, and selects a subset of transmit antennas for mobile station's uplink transmission based on the channel states between the base station and different subset of antennas at the mobile station.
摘要:
In a communication apparatus, a grouping unit determines an adaptability based on a reception quality notified by a mobile station located in a cell, and groups mobile stations or connections by each of adaptabilities; an adaptability-based frame-occupancy-rate determining unit determines a data-mapping amount (an available capacity) by each of the adaptabilities depending on an amount of interference; and a frame mapping unit controls the mobile stations or the connections grouped by each of the adaptabilities to be mapped to a wireless frame by each frame based on the determined data-mapping amount.
摘要:
A composite roll for hot rolling wherein the outer layer portion of a composite roll comprises a steel comprised of, in terms of % by weight, 1.5 to 2.4% of C, 3 to 6% of V and 10 to 20% of at least one element selected from the group consisting of Cr, Mo and W and optionally at least one element of 0.05 to 0.20% of Al and 0.02 to 0.10% of Ti as an inoculation material, with the balance comprising Fe and unavoidable impurities, the outer layer portion comprising a metallic structure which has a crystal grain diameter of 30 to 150 .mu.m and is surrounded by a eutectic carbide crystallized in the grain boundary or a metallic structure wherein a primary crystallized carbide is further dispersed and crystallized in a matrix structure of the crystal. It is excellent particularly in the surface roughening resistance.
摘要:
An apparatus for dewatering primary dewatered sludge pieces conditioned with dewatering powders comprises: a first member having a recess and a path communicating with the recess, a fluid-tight diaphragm mounted over the recess thereby defining a fluid chamber with which the path communicates, a second member having a filtrate member, and a filter member provided over the filtrate chamber. At least one of the first member and the second member is mounted to bring them into fluid-tight contact with each other, and the primary dewatered sludge pieces into a cavity defined by the diaphragm and the filter member. A pressure fluid then is fed to the fluid chamber, thereby isostatically compressing the primary dewatered sludge pieces to remove the water contained therein without substantially destroying the inner structures of the primary dewatered sludge pieces. Because of this isostatic pressure exerted by the diaphragm, the sludge pieces are compressed highly uniformly, resulting in high dewatering efficiency.
摘要:
An exhaust gas purifier for removing unburned solid particles, sparks, and flames contained in exhaust gas discharged from internal and external combustion engines includes a closed cylindrical member connected to the exhaust port of an internal or external combustion engine and a swirl-generating member disposed in the cylindrical member and provided with a plurality of swirl vanes for swirling the exhaust gas, whereby the length of time that the exhaust gas is disposed in the cylinder is extended and unburned solid particles, sparks, and flames contained in the exhaust gas are centrifugally separated and extinguished thereby discharging relatively clean gas.