Abstract: A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.

Abstract: A transmission apparatus includes: a data-symbol generation unit that generates data symbols for one block in each block; a storage and processing unit that stores therein a data symbol at a first position, among the data symbols for one block, as a copied symbol; a symbol insertion unit that generates a block symbol by putting the data symbols and the copied symbol such that the copied symbol stored in the storage and processing unit are inserted at a second position of the data symbols for one block; a time/frequency conversion unit that converts the block signal into a frequency domain signal; an interpolation unit that performs interpolation processing on the frequency domain symbol; and a CP insertion unit that generates the block signal by inserting a Cyclic Prefix into a signal on which the interpolation processing has been performed.

Abstract: The base station allocates, to one terminal, at least one transmission layer and allocates at least one resource block that is a minimum allocation unit of a communication resource in each transmission layer, to transmit a signal to the terminal, and includes processing units each associated with one of the transmission layers, the processing units being equal in number to the transmission layers. Each processing unit includes a reference signal generation unit to generate a reference signal to be used by the terminal in demodulation processing on a received signal, and an information processing unit to determine an arrangement of the resource block in which to transmit the reference signal to the terminal, based on at least one of a state of a channel between the base station and the terminal or information on the resource block to be used in transmission of the reference signal in an adjacent cell.

Abstract: The present invention relates to a method implemented by computer means of a communicating entity, for inserting a reference signal for phase tracking, said communicating entity using a discrete Fourier transformation spread orthogonal frequency division multiplexing modulator, characterized in that the method comprises: obtaining a succession of signal samples by inserting said reference signal for phase tracking within a succession of data samples, according to at least one insertion pattern chosen among pre-defined patterns with respect to predetermined criteria of communication conditions, and feeding said modulator with a succession of signal blocks obtained from said succession of signal samples, so as to apply the discrete Fourier transformation after the insertion of the reference signal for phase tracking.

Abstract: A base station includes: a control unit that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit; and a precoding unit and a transmitting unit that perform space-division multiplexing on signals of one or more layers arranged by the processing unit, and transmit the multiplexed signals.

Abstract: A transmission device includes: a data symbol generation unit; a static sequence generation unit generating a sequence of static symbols; a multiplexing unit generating a block signal in which static symbols are arranged in leading and trailing parts, while data symbols are arranged in a central part; a DFT unit transforming the block signal to a frequency-domain signal; a band reduction processing unit removing a predetermined number of signals in parts of both ends from the block signal after having been transformed to a frequency-domain signal; an interpolation processing unit performing interpolation processing on the block signal after a predetermined number of signals in parts of both ends have been removed; an IDFT unit transforming the block signal after having undergone the interpolation processing to a time-domain signal; and a transmission unit transmitting the block signal after having been transformed to a time-domain signal.

Abstract: A transmission device according to the present invention includes a reference-signal information management unit as an identifier to identify an interfering terminal that is a possible terminal to perform communication interfering with communication with a target terminal that is a destination terminal of a data signal, and a transmitter to set a group ID for reference signal generation to a group formed by the interfering terminal and the target terminal.

Abstract: A reception device includes a transmission-path estimation unit calculating a transmission-path estimation value based on static symbols included in the block signal, and a block signal demodulation unit demodulating the block signal based on the transmission-path estimation value. The transmission-path estimation unit calculates an initial value of the estimation value based on static symbols included in a first block signal to be demodulated, and recalculates a transmission-path estimation value based on a result obtained by the block signal demodulation unit demodulating data symbols included in the first block signal using the initial value and a result of demodulation of data symbols included in a second block signal having been received immediately-previously to the first block signal. The block signal demodulation unit demodulates the first block signal again using the recalculated estimation value.

Abstract: A transmission apparatus includes: a data-symbol generation unit that generates data symbols for one block in each block; a storage and processing unit that stores therein a data symbol at a first position, among the data symbols for one block, as a copied symbol; a symbol insertion unit that generates a block symbol by putting the data symbols and the copied symbol such that the copied symbol stored in the storage and processing unit are inserted at a second position of the data symbols for one block; a time/frequency conversion unit that converts the block signal into a frequency domain signal; an interpolation unit that performs interpolation processing on the frequency domain symbol; and a CP insertion unit that generates the block signal by inserting a Cyclic Prefix into a signal on which the interpolation processing has been performed.

Abstract: Provided is a communication system capable of suppressing decrease in a transmission rate. An eNB communicates with a UE using a self-contained subframe. The self-contained subframe includes a downlink signal to be transmitted from the eNB to the UE, and an uplink signal to be transmitted from the UE to the eNB in response to the downlink signal. The uplink signal has a structure including an uplink control signal indicating information for controlling transmission of the uplink signal, and uplink user data to be transmitted before and after the uplink control signal. The eNB notifies the UE of a structure of the uplink signal.

Abstract: A transmission apparatus includes: a data-symbol generation unit that generates data symbols for one block in each block; a storage and processing unit that stores therein a data symbol at a first position, among the data symbols for one block, as a copied symbol; a symbol insertion unit that generates a block symbol by putting the data symbols and the copied symbol such that the copied symbol stored in the storage and processing unit are inserted at a second position of the data symbols for one block; a time/frequency conversion unit that converts the block signal into a frequency domain signal; an interpolation unit that performs interpolation processing on the frequency domain symbol; and a CP insertion unit that generates the block signal by inserting a Cyclic Prefix into a signal on which the interpolation processing has been performed.

Abstract: A transmission apparatus includes a symbol generation unit to generate N symbols, with N being an integer equal to or larger than 2, a time-frequency conversion unit to convert the N symbols to a frequency domain signal having N points, a band limiting filter to perform band limitation on the frequency domain signal having the N points to generate a frequency domain signal having ND points which is less than N, an interpolation-processing and frequency-time conversion unit to convert the frequency domain signal having ND points to a time domain signal, and a transmission unit to transmit the time domain signal at a set transmission interval.

Abstract: A transmission apparatus includes a data-block generating unit that generates and outputs a data block including fixed sequence symbols whose signal values are formed of a fixed sequence and data symbols, a pilot-block generating unit that generates and outputs a pilot block including the fixed sequence symbols and pilot symbols that are fixed symbols known on a reception side, and an output control unit to which the data block and the pilot block are inputted, which controls whether the data block or the pilot block is outputted.

Abstract: A transmission device includes: a data symbol generation unit; a static sequence generation unit generating a sequence of static symbols; a multiplexing unit generating a block signal in which static symbols are arranged in leading and trailing parts, while data symbols are arranged in a central part; a DFT unit transforming the block signal to a frequency-domain signal; a band reduction processing unit removing a predetermined number of signals in parts of both ends from the block signal after having been transformed to a frequency-domain signal; an interpolation processing unit performing interpolation processing on the block signal after a predetermined number of signals in parts of both ends have been removed; an IDFT unit transforming the block signal after having undergone the interpolation processing to a time-domain signal; and a transmission unit transmitting the block signal after having been transformed to a time-domain signal.

Abstract: A transmission apparatus includes a data-block generating unit that generates and outputs a data block including fixed sequence symbols whose signal values are formed of a fixed sequence and data symbols, a pilot-block generating unit that generates and outputs a pilot block including the fixed sequence symbols and pilot symbols that are fixed symbols known on a reception side, and an output control unit to which the data block and the pilot block are inputted, which controls whether the data block or the pilot block is outputted.

Abstract: A transmission apparatus includes a symbol arrangement unit to receive multiple symbols constituting a block, duplicate a first symbol of a block one block previous to the block, and output a block symbol being the present block with the duplicated duplicate symbol inserted at a first position thereof, a frequency conversion unit to convert the block symbol into a frequency domain signal, a frequency component removal unit to remove one or more frequency components from the frequency domain signal, a time conversion unit to convert, after interpolation on the frequency domain signal with the frequency components removed, the interpolated frequency domain signal into a time domain signal, and a cyclic prefix insertion unit to duplicate, in the time domain signal, a signal from a position based on the first position through an end as a cyclic prefix, and insert the cyclic prefix at a beginning of the time domain 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 includes a symbol arrangement unit to receive multiple symbols constituting a block, duplicate a first symbol of a block one block previous to the block, and output a block symbol being the present block with the duplicated duplicate symbol inserted at a first position thereof, a frequency conversion unit to convert the block symbol into a frequency domain signal, a frequency component removal unit to remove one or more frequency components from the frequency domain signal, a time conversion unit to convert, after interpolation on the frequency domain signal with the frequency components removed, the interpolated frequency domain signal into a time domain signal, and a cyclic prefix insertion unit to duplicate, in the time domain signal, a signal from a position based on the first position through an end as a cyclic prefix, and insert the cyclic prefix at a beginning of the time domain signal.

Abstract: A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.

Abstract: A transmitting apparatus includes: a data generator that generates data symbols; a zero generator that generates zero symbols having signal values of zero; a controller that receives the data symbols and the zero symbols, and controls symbols to be output; a static sequence generator that generates static sequence symbols having signal values of a static sequence; a multiplexer that divides the static sequence symbols and generates a pre-interpolation block by arranging the divided static sequence symbols at a head of the pre-interpolation block and a tail of the pre-interpolation block in the pre-interpolation block, the head preceding the symbols input from the controller, the tail following the symbols input from the controller, and a signal converter that performs a Fourier transform, the interpolation, and an inverse Fourier transform on the pre-interpolation block and outputs a block having being subjected to the interpolation.