Abstract: In transmitting a wireless packet signal for channel response estimation, after AGC preambles and channel estimation preambles are transmitted by using a plurality of antennas, at least one data stream is transmitted, as subcarriers distributed to the plurality of antennas, by using the plurality of antennas.

Abstract: wireless communication apparatus (transmitter) including a plurality of antennas for transmitting a plurality of known symbol sequences and data symbols, transmits the known symbol sequences, each of the known symbol sequences including a plurality of known symbols, each of the known symbols whose plural known information being carried on a plurality of subcarriers, a phase of last known symbol of the each of the known symbol sequences being rotated, and transmits the data symbols after the known symbol sequences are transmitted.

Abstract: A wireless transmission device which communicates with a wireless reception device is provided with a transmission-signal-generating unit configured to generate, transmission signals having transmission rates arranged in order corresponding to an input order of data items of the information sequence. The transmission device is also provided with a preamble adder which adds, to the transmission signals, respective preamble signals assigned in order of the transmission rates and used for estimation of channel responses at the wireless reception device. The transmission device is further provided with transmission units configured to transmit the transmission signals with the preamble signals added thereto.

Abstract: Radio communication apparatus for receiving OFDM signal from base station and transmitting FH signal to base station, using sub-channels, base station comparing hopping pattern information items indicating hopping patterns from radio communication apparatuses including radio communication apparatus, and generating collision information when hopping patterns include colliding hopping patterns, includes estimation unit configured to estimate channel response values of sub-channels based on OFDM signal, selector which selects, from sub-channels, several sub-channels which have higher channel response values than a value, each of channel response values being expressed by power level, signal-to-noise power ratio, or signal-to-interference ratio, determination unit configured to determine hopping pattern from selected sub-channels, transmitter which transmits, to base station, hopping pattern information item indicating determined hopping pattern, receiver which receives collision information from base station, an

Abstract: A wireless communication apparatus having a plurality of antennas for transmitting a known symbol by using a plurality of subcarriers to a receiver, the known symbol including known information, the apparatus includes each of the subcarriers which carries the known information being classified into at least two groups, and a phase control unit configure to control inversion/non-inversion of a phase of the known information carried on two subcarriers which belong to the same group in accordance with notification information to be notified to the receiver.

Abstract: A wireless communication apparatus includes a plurality of antennas, transmits a plurality of known symbol sequences each including a plurality of known symbols by using the antennas, each of the known symbols having subcarrier arrangement on which plural known information of the each of the known symbols are carried on, and inversion/non-inversion of a phase of known information on one of two adjacent subcarriers of the subcarrier arrangement being controlled in accordance with the number of the known symbols and time position of the each of the known symbols, and transmits data symbols by using the antennas after the known symbol sequences are transmitted.

Abstract: Before data is transmitted from a plurality of antennas, a plurality of known symbol sequences are transmitted from these antennas. Each known symbol sequence contains a plurality of known symbols having different subcarrier arrangements. Known symbols transmitted from different antennas have different subcarrier arrangements.

Abstract: In a wireless transmission method and wireless transmitter using a plurality of antennas at least in signal transmission, a process requiring a high immediateness is enabled to implement at the reception end. A wireless communication apparatus, for making a transmission based on a transmission unit being specified as a predetermined plurality of symbols, sends a plurality of symbols other than the last N symbols (N is an integer equal to or greater than 1) of the transmission unit through use of a plurality of antenna, and the last N symbols of the transmission unit through use of one antenna.

Abstract: A radio transmitting apparatus with a plurality of transmission units comprises a calculation unit configured to calculate, based on a data length of a transmission signal including a control signal and a data signal following the control signal, a transmission time required for transmitting the transmission signal and one or more transmission times corresponding to the number of one or more divisions of the transmission signal, and a signal generation unit configured to generate a signal supplied to at least one of the transmission units, using the transmission signal corresponding to a minimum transmission time of the one or more transmission times or the divisions of the transmission signal which correspond to the minimum transmission time.

Abstract: A wireless device, method, and signal for use in communication of a wireless packet between transmitting device and a wireless receiving device via a plurality of antennas, wherein a signal generator generates wireless packet including a short-preamble sequence used for a first automatic gain control (AGC), a first long-preamble sequence, a signal field used for conveying a length of the wireless packet, an AGC preamble sequence used for a second AGC to be performed after the first AGC, a second long-preamble sequence, and a data field conveying data. The AGC preamble sequence is transmitted in parallel by the plurality of antennas.

Abstract: An estimation apparatus for estimating a channel response of a radio propagation path using a received signal including a first known signal, comprises a generator which generates a reference signal matrix, a calculator which calculates a generalized inverse matrix of the reference signal matrix including singular values which exceed a preset threshold value, an estimation unit configured to estimate an impulse response of the radio channel modeled using a transversal filter based on the first known signal and the generalized inverse matrix, and a converter which converts the estimated impulse response into a frequency-domain signal to acquire a frequency transfer function of the channel.

Abstract: A controller controls weighting factors of received signals of combining units, such that impairment included in an output signal of the combining unit and impairment included in an output signal of the combining unit are mutually uncorrelated and that the combining units strongly receive different multipath signals which arrive at different propagation delay timing. Soft output decoders perform decoding by iterating soft output detection on the basis of the outputs of the combining units and results of mutual soft output detection, to enhance the reliability of likelihood information about the detected signal discrimination. After that, a hard output decoder performs hard output.