摘要:
A peak suppressing apparatus includes a pre-emphasis section that performs a pre-emphasis process on a signal, which is to be wirelessly transmitted and a peak of which is to be suppressed, the pre-emphasis process emphasizing a given frequency range component of the signal, a clipping section that limits, to a given threshold value, an amplitude of the signal that has been subjected to the pre-emphasis process, a de-emphasis section that performs a de-emphasis process on the signal, whose amplitude has been limited, the de-emphasis process suppressing the given frequency range component of the signal, and a frequency converter that converts, to allow wireless transmission, a frequency of the signal that has been subjected to the de-emphasis process.
摘要:
A mobile station that performs wireless communication through a base station, includes a first connection setup request unit configured to make a first connection setup request for an emergency call and a normal call when communication performed in the communication region of the base station is in a congestion state, the emergency call and the normal call using a signal sequence that corresponds to a sequence number of a connection setup request signal used when communication performed in a communication region of the base station is in a normal state, and a second connection setup request unit configured to make a second connection setup request for another one of the emergency call and the normal call different from the first connection setup request, using a generated-signal sequence generated from the sequence number, when communication performed in the communication region of the base station is in the congestion state.
摘要:
An amplifying device includes a signal separating unit that separates a first signal and a second signal from an input signal; a first signal-generating unit that generates, based on the first signal, a first cancelling signal that suppresses ringing caused during processing of the first signal; a first combining unit that combines the first signal and the first cancelling signal; a first amplifying unit that amplifies a signal output from the first combining unit; a second signal-generating unit that generates, based on the second signal, a second cancelling signal that suppresses ringing caused during processing of the second signal; a second combining unit that combines the second signal and the second cancelling signal; a second amplifying unit that amplifies a signal output from the second combining unit; and a third combining unit that combines a signal output from the first amplifying unit and one output from the second amplifying unit.
摘要:
A device and a process which enable use of transmission diversity in transmission to a receiving station when wirelessly relaying wireless signals from a transmitting station to the receiving station. A reception antenna RA in a wireless relay device (RS) receives from the transmitting station such as a base station (BS) a signal in which data signals are respectively allocated to carriers at adjacent radio frequencies. The wireless relay device performs space frequency block coding (SFBC) of the received signal. Then, the wireless relay device transmits SFBC-encoded signals through two transmission antennas SA0 and SA1 to the receiving station such as a mobile station (MS).
摘要:
A relay station includes a receiver that receives a signal from a base transceiver station, a detection unit that detects a carrier frequency deviation of the received signal, and a calculation unit that calculates a delay rate of the signal based on the detected carrier frequency deviation. The relay station includes a delay control unit that controls an amount of delay of the signal in accordance with the calculated delay rate, a compensation unit that compensates for the detected carrier frequency deviation of the signal, and a transmitter that transmits the signal of which the amount of delay is controlled and of which the carrier frequency deviation is compensated for.
摘要:
A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to both symbol and mobile station, is disclosed. The apparatus encodes transmission data, modulates the encoded data, compresses the time domains of each symbol of the modulated transmission-symbol sequence, repeats the symbols a specified number of times, rearranges each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as the transmission-symbol sequence, generates each phase that changes at a speed specific to each symbol of the transmission-symbol sequence, performs phase rotation specific to the symbols for each symbol of the rearranged repetitive-symbol sequence, generates phase that changes at a speed specific to a mobile station, performs phase rotation specific to the mobile station for the symbol sequence for which the phase rotation was performed, and transmits the phase-rotated symbol sequence.
摘要:
A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to both symbol and mobile station, is disclosed. The apparatus encodes transmission data, modulates the encoded data, compresses the time domains of each symbol of the modulated transmission-symbol sequence, repeats the symbols a specified number of times, rearranges each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as the transmission-symbol sequence, generates each phase that changes at a speed specific to each symbol of the transmission-symbol sequence, performs phase rotation specific to the symbols for each symbol of the rearranged repetitive-symbol sequence, generates phase that changes at a speed specific to a mobile station, performs phase rotation specific to the mobile station for the symbol sequence for which the phase rotation was performed, and transmits the phase-rotated symbol sequence.
摘要:
A transmitter has a mapping unit mapping transmitting symbol data to a plurality of phase amounts, and a phase rotating process unit giving a phase rotation to the transmitting symbol data mapped to the phase amounts to generate a polyphase modulated signal. A receiver has an inter-chip phase difference detecting unit detecting a phase difference between a received signal and a signal received one chip unit time before at each chip unit time, an averaging process unit averaging phase differences detected at respective chip unit times for one symbol time, and an deciding unit deciding an output from the averaging process unit and demodulating the polyphase modulated signal. The symbol error rate can be improved without an error correction circuit.
摘要:
In a frequency-division multiplexing transmitting apparatus for transmitting data at a frequency specific to a mobile station, a symbol compression and repetition unit compresses the time domain of each symbol of a transmit symbol sequence, repeats the symbol a prescribed number of times (L times) and rearranges the symbols of the obtained repetitive symbol sequence in such a manner that the symbols will have an arrangement identical with the arrangement of the transmit symbol sequence; a phase rotating unit applies phase rotation, which varies at a speed specific to the mobile station, to each symbol of the repetitive symbol sequence after the rearrangement thereof; and a transmitting unit transmits the-symbols that have undergone the phase rotation. The phase rotating unit varies the amount of phase rotation, which is applied to each symbol of the repetitive symbols, in increments of k·2π/L (where k represents an integer specific to the mobile station) at the period of the repetitive symbol sequence.
摘要:
A clock generating circuit which generates a clock signal with a desired frequency. An adder adds a first predetermined value to a previous value stored in flip-flops to create a current value (first value). A subtractor computes the difference between a value obtained by adding a second predetermined value to the first value and a third predetermined value and outputs the resultant difference value as a second value. The first value increases every time a reference clock pulse is input. The resultant values are sent to a memory device via a selector and the flip-flops. When the first value gradually increases and finally exceeds a third predetermined value, the selector selects the second value instead of the first value, where the third predetermined value is set to the maximum address value of the memory device.