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.

A transmitter is configured to convey N bits of information and L bits of information, for a total of N+L bits of information, to a destination device via an auxiliary device. The transmitter is configured to select, from a plurality of auxiliary devices that are respectively associated with different possible states of the L bits of information, an auxiliary device that is associated with a state of the L bits of information to be conveyed. L may be 1. The transmitter is also configured to convey the N+L bits of information from the transmitter to the destination device via the selected auxiliary device, without the transmitter transmitting any of the L bits of information to the destination device or the selected auxiliary device, by transmitting a signal to the selected auxiliary device. This signal comprises the N bits of information. N may be 0.

A transmitter is configured to convey N bits of information and L bits of information, for a total of N+L bits of information, to a destination device via an auxiliary device. The transmitter is configured to select, from a plurality of auxiliary devices that are respectively associated with different possible states of the L bits of information, an auxiliary device that is associated with a state of the L bits of information to be conveyed. L may be 1. The transmitter is also configured to convey the N+L bits of information from the transmitter to the destination device via the selected auxiliary device, without the transmitter transmitting any of the L bits of information to the destination device or the selected auxiliary device, by transmitting a signal to the selected auxiliary device. This signal comprises the N bits of information. N may be 0.

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.

In order to perform UL transmission in a future radio communication system, a user terminal comprising: a generating section that generates an uplink (UL) signal to transmit to a radio base station; and a control section that controls transmission of the UL signal. The control section switches between OFDMA based transmission and SC-FDMA based transmission to apply to the UL signal. In addition, the user terminal controls the OFDMA based transmission and the SC-FDMA based transmission autonomously or based on information transmitted from the radio base station.

Systems/methods are disclosed wherein interconnected first and second transmitters are used to convey information to a destination device by wirelessly transmitting by the first transmitter first data using first frequencies and, responsive to a size of data that is to be transmitted to the destination device, wirelessly transmitting by the second transmitter second data using second frequencies. According to some embodiments, the first and second data are transmitted simultaneously in time. According to further embodiments, a smartphone comprises the first and second transmitters. Aggregation of the first and second data is performed by the destination device.

A transmitter is configured to convey N bits of information and L bits of information, for a total of N+L bits of information, to a destination device via an auxiliary device. The transmitter is configured to select, from a plurality of auxiliary devices that are respectively associated with different possible states of the L bits of information, an auxiliary device that is associated with a state of the L bits of information to be conveyed. L may be 1. The transmitter is also configured to convey the N+L bits of information from the transmitter to the destination device via the selected auxiliary device, without the transmitter transmitting any of the L bits of information to the destination device or the selected auxiliary device, by transmitting a signal to the selected auxiliary device. This signal comprises the N bits of information. N may be 0.

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.

A user terminal is disclosed that includes a transmitter that transmits uplink control information (UCI) using an uplink control channel and a processor that controls at least one of generation and transmission of the UCI based on a spreading factor of the uplink control channel. Additionally, at least one of a number of symbols and a position of a demodulation reference signal for the uplink control channel is fixed irrespective of the spreading factor.

Techniques are described for wireless communication. One method includes searching for a synchronization channel on a first raster point of a frequency raster identified for synchronization channel transmission. The frequency raster includes a plurality of raster points in a radio frequency spectrum. The method also includes identifying a pull-in signal on the first raster point; determining, from the pull-in signal, a second raster point of the frequency raster on which the synchronization channel is transmitted; and receiving the synchronization channel on the second raster point. Another method includes transmitting the pull-in signal and the synchronization channel.