Patent application number | Description | Published |
20080212543 | RADIO COMMUNICATION SYSTEM, BASE STATION AND RADIO COMMUNICATION METHOD - The present invention is provided with a control channel searching unit | 09-04-2008 |
20080222482 | TRANSMITTER AND RECEIVER - There is provided with a transmitter including: an input unit configured to input a data symbol sequence; a block generator configured to sequentially generate data blocks each including a plurality of data symbols by using the data symbol sequence; an addition unit configured to add a duplicate of h data symbols at an end of a first data block to a head of the first data block as a cyclic prefix to obtain a first data block with the cyclic prefix; and a transmission unit configured to transmit the first data block with the cyclic prefix, wherein the block generator uses, as k data symbols that precede the h data symbols at the end of the first data block, a duplicate of k data symbols at an end of a second data block that precedes the first data block. | 09-11-2008 |
20080227389 | RADIO COMMUNICATION METHOD, RADIO TRANSMISSION APPARATUS AND RECEIVING APPARATUS - A radio communication method including, generating a first transmit RF signal and a second transmit RF signal from a data signal to be transmitted, each of the first and second transmit RF signals having a power spectrum in symmetric shape in the frequency domain, transmitting the first transmit RF signal and the second transmit RF signal at a different time, receiving the first transmit RF signal and the second transmit RF signal to generate a first received RF signal and a second received RF signal, and reproducing the data signal from the first received RF signal and the second received RF signal. | 09-18-2008 |
20080242233 | RADIO TRANSMITTING METHOD AND APPARATUS, AND RADIO RECEIVING METHOD AND APPARATUS - A radio transmitting apparatus includes a storage unit configured to store a plurality of weight sequence sets, which are each assigned to a plurality of transmission blocks sectioned by time axes and frequency axes, by associating the plurality of weight sequence sets with the plurality of transmission blocks, a first selecting unit configured to select one transmission block from the plurality of transmission blocks, a second selecting unit configured to select one weight sequence from one weight sequence set assigned to the one transmission block signal, a converting unit configured to convert a data signal by using the one weight sequence to generate a converted signal, and a transmitting unit configured to transmit the converted signal by using the one transmission block. | 10-02-2008 |
20080242321 | RADIO COMMUNICATION SYSTEM, BASE STATION APPARATUS, AND TERMINAL APPARATUS - A base station apparatus includes a first transmission unit configured to transmit area common information common to all base station apparatuses in an area by using not less than one time slot of not less than one common time slot assigned to each of a plurality of areas including a plurality of base station apparatuses, the common time slot being assigned to adjacent areas which are different from each other, a carrier sense unit configured to perform carrier sense on a first time slot except for the common time slot, a selection unit configured to select a second time slot determined as being available by the carrier sense, and a second transmission unit configured to intermittently transmit a control signal unique to the base station apparatus in the second time slot at K (K positive integer) time slot periods. | 10-02-2008 |
20090003488 | TRANSMITTER AND RECEIVER - There is provided with a transmitter including: a modulator configured to modulate a data bit sequence by alternately using first and second signal point sets to generate a data symbol sequence; a data block generator configured to generate data blocks each including a plurality of data symbols, an addition unit configured to add a guard interval to each data block to generate data blocks with guard intervals; and a controller configured to control modulation by the modulator so that an end data symbol of a first data block with the guard interval and a head data symbol of a second data block with the guard interval generated following the first data block with the guard interval belong to different signal point sets and data symbols in the first and second data blocks with the guard interval alternately belong to the first and second signal point sets. | 01-01-2009 |
20090060090 | TRANSMITTER AND RECEIVER - There is provided with there is provided with a transmitter including: a pilot generation unit configured to generate a plurality of pilot symbols; a bit sequence generation unit configured to invert each bit in a first bit sequence to generate a second bit sequence; a transmission block generation unit configured to generate a transmission block by giving phase rotation determined according a value of each of bits in the first and second bit sequence to each of the pilot symbols corresponding to each of the bits; and a transmission unit configured to transmit the transmission block. | 03-05-2009 |
20120063535 | TRANSMITTING APPARATUS AND RECEIVING APPARATUS - According to one embodiment, a transmitting apparatus includes a generation unit, a division unit, an imparting unit and a transmitting unit. The generation unit generates first control information in accordance with a first information format. The division unit divides the first control information into control information pieces in accordance with information format divisions into which the first information format is divided and which include respective pointer regions, each of the information format divisions having a same data length as a second information format. The imparting unit imparts, to the pointer region of each of the information format divisions, a pointer indicating a wireless communication resource used to transmit one of the control information pieces corresponding to one of the information format divisions other than the each control information format division. The transmitting unit transmits the control information pieces. | 03-15-2012 |
20120064933 | TRANSMITTING APPARATUS, RECEIVING APPARATUS AND METHOD - According to one embodiment, a transmitting apparatus includes a transmitting unit and a selecting unit. The transmitting unit transmits first control information using one of first communication resources. The first communication resources are included in a first transmission band and have respective independent numbers. The transmitting unit transmits second control information using one of second communication resources. The second communication resources are included in a second transmission band and have respective independent numbers. The selecting unit restricts the second communication resources to restricted second communication resources in accordance with a number assigned to one of the first communication resources used to transmit the first control information, and to select one second communication resource from the restricted second communication resources. The transmitting unit transmits the second control information using the selected second communication resource. | 03-15-2012 |
20120127849 | SIGNAL RECEIVING APPARATUS AND COMMUNICATION SYSTEM - There is provided a signal receiving apparatus including first to pth stage computers configured to apply, in a step-by-step manner, butterfly operations to 2 | 05-24-2012 |
20120170696 | RECEIVER - A receiver includes: a first mixer that generates an in-phase signal from a received signal; a second mixer that generates a quadrature signal from the received signal; a first A/D converter that converts the in-phase signal into a digital in-phase signal; a second A/D converter that converts the quadrature signal into a digital quadrature signal; a calculator that calculates an addition/subtraction quantity based on a correction quantity, which is based on an amplitude value of the digital in-phase signal or the digital quadrature signal, and a quantization error of the first A/D converter or the second A/D converter; and an addition/subtraction unit that adds or subtracts the addition/subtraction quantity to or from the digital in-phase signal or the digital quadrature signal. | 07-05-2012 |
20120195296 | WIRELESS COMMUNICATION APPARATUS - According to embodiments, a wireless communication apparatus supports at least a second wireless communication scheme between a first, wireless communication scheme and the second wireless communication scheme. The first wireless communication scheme requires that a wireless medium is determined to be busy when a reception level is equal to or greater than a minimum reception sensitivity level of physical scheme. The apparatus includes a first processing unit and a second processing unit. The first processing unit is configured to set a value lower than a maximum transmission power of the first wireless communication scheme, for a maximum transmission power of the second wireless communication scheme and set a value greater than the minimum reception sensitivity level, of the physical scheme, for a carrier sense level, when the second wireless communication scheme is used. The second processing unit is configured to carry out carrier sense using the carrier sense level. | 08-02-2012 |
20120243646 | FREQUENCY OFFSET COMPENSATION APPARATUS - According to one embodiment, a frequency offset compensation apparatus includes a first estimation unit, a second estimation unit, a setting unit, a synthesis unit and a compensation unit. The first estimation unit estimates a first rotation. The second estimation unit estimates a second rotation. The setting unit sets a weighting factor for the second rotation to a first value if a received power is less than a threshold value, and sets the weighting factor for the rotation to a second value being smaller than the first value if the received power is not less than the threshold value. The synthesis unit calculates a compensation value. The compensation unit compensates for a frequency offset. | 09-27-2012 |
20120254704 | REED-SOLOMON DECODER AND RECEPTION APPARATUS - According to one embodiment, a Reed-Solomon decoder comprises an analyzer and a calculator. The analyzer analyzes a data frame and calculates a size of a last code word located at an end of a data portion, using information included in a header portion. The calculator calculates correction coefficients, using the size of the last code word, for correcting coefficients of an error locator polynomial and coefficients of an error value polynomial for the last code word in accordance with a difference between a base size of Reed-Solomon code words and the size of the last code word, before error detection for a code word located immediately before the last code word in the data portion begins. | 10-04-2012 |
20120258666 | WIRELESS COMMUNICATION APPARATUS AND METHOD - According to one embodiment, a wireless communication apparatus includes a determination unit, a first setting unit, a second setting unit and a wireless unit. The determination unit determines whether a signal degradation degree is higher than a threshold value. The first setting unit sets first parameters relating to a first data rate and a first communication robustness. The second setting unit sets second parameters relating to a second data rate and a second communication robustness if an instruction signal is received and if the signal degradation degree is higher than the threshold value. The wireless unit communicates with a communication partner using one of the first parameters and the second parameters. | 10-11-2012 |
20130243063 | CHANNEL PHASE ESTIMATION APPARATUS, DEMODULATOR, AND RECEIVING APPARATUS - According to one embodiment, a channel phase estimation apparatus includes a phase memory, subtractor, multiplier, and adder. The phase memory is configured to store a first phase estimation value up to a (k−1)-th (for k=1, 2, . . . , K) symbol. The subtractor is configured to calculate a difference value between a phase value of one carrier of a k-th symbol and the first phase estimation value. The multiplier is configured to multiply the difference value by a weight. The adder is configured to add a value output from the multiplier and the first phase estimation value to output a second phase estimation value up to the k-th symbol. | 09-19-2013 |
20140079050 | WIRELESS COMMUNICATION APPARATUS AND METHOD - According to one embodiment, a wireless communication apparatus includes a generation unit, a control unit, a transmission unit, a reception unit and an analysis unit. The control unit sets, as a first value, a magnitude of a transmission power of the first frame, and sets, as a second value smaller than the first value, a magnitude of a transmission power of the second frame. The transmission unit transmits the first frame at a first time interval until an acknowledgement frame is received, and transmits the second frame at a second time interval until an accept frame is received. The analysis unit analyzes the request transmission power information. The control unit determines a transmission power of a data frame based on the request transmission power information. | 03-20-2014 |
20140181170 | ARITHMETIC CIRCUIT AND ARITHMETIC METHOD - According to one embodiment, an arithmetic circuit includes follows. The arithmetic unit performs an arithmetic operation including addition and multiplication to generate a first value of (n+m) bits. The rounding preprocessor performs an OR operation on lower (m−k) bits of the first value to generate a second value of 1 bit. The register stores a third value of (n+k+1) bits obtained by concatenating upper (n+k) bits of the first value and the second value. The rounding postprocessor calculates a carry bit value of 1 bit from a most significant bit of the third value and lower (k+1) bits of the third value, and adds the carry bit value to upper n bits of the third value. | 06-26-2014 |
20140241413 | INFORMATION PROCESSOR, RECEIVER, AND INFORMATION PROCESSING METHOD - An information processor has a CIR estimator configured to estimate channel impulse response of an input signal including a channel estimation sequence and a data sequence, based on the channel estimation sequence, an extended CIR calculator configured to calculate extended channel impulse response based on the channel impulse response estimated by the CIR estimator so that an extended CIR element padded with zeros is repeated a plurality of times in the extended channel impulse response, a Fourier transformer configured to convert the data sequence of the input signal into a frequency domain signal to calculate frequency response based on the extended channel impulse response, and an equalizer configured to perform equalization for removing a distortion from a propagation channel, based on the frequency domain signal and the frequency response. | 08-28-2014 |
20150063341 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus supports at least a second wireless communication scheme between a first wireless communication scheme and the second wireless communication scheme. The first wireless communication scheme requires that a wireless medium is determined to be busy when a reception level is equal to or greater than a minimum reception sensitivity level of a physical scheme. The apparatus includes a first processing unit and a second processing unit. The first processing unit is configured to set a value lower than a maximum transmission power of the first wireless communication scheme, for a maximum transmission power of the second wireless communication scheme and set a value greater than the minimum reception sensitivity level of the physical scheme, for a carrier sense level, when the second wireless communication scheme is used. The second processing unit is configured to carry out carrier sense using the carrier sense level. | 03-05-2015 |