Abstract: A transmitter for use in a communication system uses a orthogonal modulation method, and the transmitter includes: an orthogonal sequence prescriber 12 that prescribes association between orthogonal signals and information words determined on the basis of sizes of differences between information words of a plurality of mutually different information words and a probability of occurrence of decision errors between orthogonal signals of a plurality of mutually orthogonal signals; and a symbol mapper 11 that, upon input of any of the information words, generates modulation symbols based on the orthogonal signals associated with the input information word according to the associations prescribed by the orthogonal sequence prescriber.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes a data-symbol generation unit that generates data symbols; a fixed-symbol arrangement unit that arranges a data symbol and a fixed symbol such that the fixed symbol is inserted at a predetermined position in the block signal to generate a block symbol; an interpolation unit that performs interpolation processing on the block symbol; and a CP insertion unit that inserts a Cyclic Prefix into a signal on which the interpolation processing has been performed to generate the block signal.

Abstract: A transmitter for use in a communication system uses a orthogonal modulation method, and the transmitter includes: an orthogonal sequence prescriber that prescribes association between orthogonal signals and information words determined on the basis of sizes of differences between information words of a plurality of mutually different information words and a probability of occurrence of decision errors between orthogonal signals of a plurality of mutually orthogonal signals; and a symbol mapper that, upon input of any of the information words, generates modulation symbols based on the orthogonal signals associated with the input information word according to the associations prescribed by the orthogonal sequence prescriber.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes a data-symbol generation unit that generates data symbols; a fixed-symbol arrangement unit that arranges a data symbol and a fixed symbol such that the fixed symbol is inserted at a predetermined position in the block signal to generate a block symbol; an interpolation unit that performs interpolation processing on the block symbol; and a CP insertion unit that inserts a Cyclic Prefix into a signal on which the interpolation processing has been performed to generate the block signal.

Abstract: A communication-line-quality estimating apparatus of which a receiver receives from a transmitter a signal including known signals whose phase relation is known between the transmitter and the receiver. The communication-line-quality estimating apparatus includes a pilot adding unit that cumulatively adds up and averages a power value of a noise component calculated by addition or subtraction in a specified combination of the known signals, a first power calculating unit, a first averaging processing unit, a second power calculating unit that cumulatively adds up and averages a power value of the known signals, a second averaging processing unit, and a power-ratio calculating unit that estimates communication line quality using a noise signal power value input from the first averaging processing unit and a reception signal power value input from the second averaging processing unit.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes a data-symbol generation unit that generates data symbols; a fixed-symbol arrangement unit that arranges a data symbol and a fixed symbol such that the fixed symbol is inserted at a predetermined position in the block signal to generate a block symbol; an interpolation unit that performs interpolation processing on the block symbol; and a CP insertion unit that inserts a Cyclic Prefix into a signal on which the interpolation processing has been performed to generate the block signal.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.

Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes a data-symbol generation unit that generates data symbols; a fixed-symbol arrangement unit that arranges a data symbol and a fixed symbol such that the fixed symbol is inserted at a predetermined position in the block signal to generate a block symbol; an interpolation unit that performs interpolation processing on the block symbol; and a CP insertion unit that inserts a Cyclic Prefix into a signal on which the interpolation processing has been performed to generate the block signal.

Abstract: A communication-line-quality estimating apparatus of which a receiver receives from a transmitter a signal including known signals whose phase relation is known between the transmitter and the receiver. The communication-line-quality estimating apparatus includes a pilot adding unit that cumulatively adds up and averages a power value of a noise component calculated by addition or subtraction in a specified combination of the known signals, a first power calculating unit, a first averaging processing unit, a second power calculating unit that cumulatively adds up and averages a power value of the known signals, a second averaging processing unit, and a power-ratio calculating unit that estimates communication line quality using a noise signal power value input from the first averaging processing unit and a reception signal power value input from the second averaging processing unit.

Abstract: A receiver that estimates a frequency response of a transmission path using a first pilot signal stored in advance and a second pilot signal received, the receiver includes an electric power information calculation means that calculates electric power information of the first pilot signal for each subcarrier, a coefficient calculation means that calculates a coefficient on the basis of comparison between the electric power information and a predetermined threshold, a multiplication means that multiplies the electric power information of the first pilot signal for each subcarrier by a corresponding coefficient calculated by the coefficient calculation means, a transmission path estimation means that calculates an estimation value of a frequency response of a transmission path on the basis of the first pilot signal multiplied in the multiplication means and the second pilot signal received from a transmitter, and an interpolation processing means that performs interpolation processing for the calculated estimat

Abstract: A receiver that estimates a frequency response of a transmission path using a first pilot signal stored in advance and a second pilot signal received, the receiver includes an electric power information calculation means that calculates electric power information of the first pilot signal for each subcarrier, a coefficient calculation means that calculates a coefficient on the basis of comparison between the electric power information and a predetermined threshold, a multiplication means that multiplies the electric power information of the first pilot signal for each subcarrier by a corresponding coefficient calculated by the coefficient calculation means, a transmission path estimation means that calculates an estimation value of a frequency response of a transmission path on the basis of the first pilot signal multiplied in the multiplication means and the second pilot signal received from a transmitter, and an interpolation processing means that performs interpolation processing for the calculated estimat

Abstract: A method determining information enabling a mobile station to identify which wireless telecommunication network resources are allocated to the mobile station. The allocated resources are divided into plural non contiguous clusters of resources.

Abstract: A transmitting apparatus that converts a transmission digital signal to a high-frequency analog signal and transmits the high-frequency analog signal using a plurality of transmission frequencies, the transmitting apparatus including: a dividing unit that divides a transmission signal sequence into a plurality of blocks; a sub-block generating unit that applies pre-coding processing to the blocks and further divides the blocks after the pre-coding processing into sub-blocks; a frequency allocating unit that generates a frequency signal in which the sub-blocks are allocated to the transmission frequencies; and an inverse DFT processing unit that transforms the frequency signal into a time signal, wherein the transmitting apparatus sets the time signal as the transmission digital signal.

Abstract: A method determining information enabling a mobile station to identify which wireless telecommunication network resources are allocated to the mobile station. The allocated resources are divided into plural non contiguous clusters of resources.

Abstract: A communication system in which a base station selects any one of a continuous allocation scheme of allocating frequency bands continuously and a discrete allocation scheme of allocating frequency bands discretely and performs allocation of frequency bands to a user terminal. If the discrete allocation scheme is selected, the base station divides the frequency bands to be allocated into sub blocks on the basis of predetermined discrete allocation information for imposing a constraint on a discrete allocation state, and generates a control signal on the basis of the discrete allocation information (S12, S13), the control signal being intended to notify a result of allocation where arrangement on a frequency axis is determined in units of sub blocks. The user terminal determines the frequency bands allocated to the own terminal on the basis of the discrete allocation information retained and a control signal received from the base station.

Abstract: A transmitting apparatus that converts a transmission digital signal to a high-frequency analog signal and transmits the high-frequency analog signal using a plurality of transmission frequencies, the transmitting apparatus including: a dividing unit that divides a transmission signal sequence into a plurality of blocks; a sub-block generating unit that applies pre-coding processing to the blocks and further divides the blocks after the pre-coding processing into sub-blocks; a frequency allocating unit that generates a frequency signal in which the sub-blocks are allocated to the transmission frequencies; and an inverse DFT processing unit that transforms the frequency signal into a time signal, wherein the transmitting apparatus sets the time signal as the transmission digital signal.

Abstract: A metric calculating unit calculates a metric based on a provisional determination of a transmission signal and a reception signal. A lattice-point-range setting/estimate-symbol generating unit forms a hypersphere centering around a reception signal point based on the calculated metric or an updated metric, and determines whether a candidate of an estimate symbol is present within the hypersphere. A metric calculating/comparing unit calculates a metric based on the candidate of the estimate symbol and the reception signal, stores a minimum metric and corresponding candidate of the estimate symbol, and updates stored information when a newly calculated metric is minimum.

Abstract: A receiving apparatus includes a digital signal demodulating unit, including a desired-signal transmission-path estimating unit that performs transmission path response matrix estimation for a desired signal; an interface-signal transmission-path estimating unit that performs transmission path response matrix estimation for an interference signal; a combined-transmission-path matrix generating unit that combines the matrices to generate a combined transmission path response matrix; a matrix calculating unit that converts the combined matrix into an upper triangular matrix; a hypersphere generating unit that generates a hypersphere centering on a reception signal point in a lattice point space; and a symbol searching unit that forms the lattice point space from the combined matrix by searching lattice points in the hypersphere for a lattice point having the smallest metric to the reception signal point, to determine the lattice point as estimate values of the desired signal and interference signal.