摘要:
A wireless communication apparatus includes: an antenna; a communication unit for receiving a radio signal via the antenna; a tuning unit for tuning an impedance of the antenna; an impedance controller for controlling the tuning unit to match the impedance of the antenna with an impedance of the communication unit; and a halting unit for halting controlling the impendance of the antenna in accordance with an intensity of the received radio signal.
摘要:
A communication system that performs encoding and decoding for communication includes a transmitting apparatus and a receiving apparatus. The transmitting apparatus includes a turbo encoding unit including a first encoding unit that encodes an input signal and generates a first parity bit by bit-based encoding and n (n = 1, 2, 3, ...) second encoding units that encode the input signal and generate second parity bits by bit-based encoding, and a symbol mapping unit that maps an output from the turbo encoding unit to a symbol by bit-based mapping operation and modulates the output. And the receiving apparatus includes a demodulating unit that demodulates a transmission signal, and a turbo decoding unit that performs turbo decoding on the demodulated signal by bit-based decoding.
摘要:
A receiver and a receiving method for receiving code division multiplexed signals transmitted from a first transmitter which is adjacent to second and third transmitters transmitting code division multiplexed signals. The receiver comprises despreading timing means (56) for deciding despreading timings which include receiving a path timing τ of a transmission path from the fist transmitter and interference-reducing timings τ ± Δτ, wherein the timing Δτ corresponds to a time interval between a receiving timing τ 1 of a second transmission path from the second transmitter and a receiving timing τ 2 of a third transmission path from the third transmitter; and despreading means for despreading received signals in accordance with the despreading timings decided by the despreading timing decision means (56).
摘要:
In an equalizer arranged in a wireless communication device: information on correlation in one or more first wireless signals is generated; a channel vector is generated on the basis of the one or more first wireless signals; an extended, circulant matrix is generated; an extended channel vector is generated, the number of which is identical to the number of rows of the extended correlation matrix; and weight coefficients are calculated as a solution, in the frequency domain, of an equation expressed by the extended correlation matrix and the extended channel vector.
摘要:
A receiver and a receiving method for receiving code division multiplexed signals transmitted from a first transmitter which is adjacent to second and third transmitters transmitting code division multiplexed signals. The receiver comprises despreading timing means (56) for deciding despreading timings which include receiving a path timing Ä of a transmission path from the fist transmitter and interference-reducing timings Ä ± ”Ä, wherein the timing ”Ä corresponds to a time interval between a receiving timing Ä 1 of a second transmission path from the second transmitter and a receiving timing Ä 2 of a third transmission path from the third transmitter; and despreading means for despreading received signals in accordance with the despreading timings decided by the despreading timing decision means (56).
摘要:
A transmission apparatus (1) obtains, for each transmission to a reception apparatus (2), information on a per-bit transmission of a transmission bit string, and controls a per-bit transmission condition for a current transmission bit string such that a per-bit transmission quality of the transmission bit string approaches evenly based on cumulative information on the transmissions up to the last transmission. This makes it possible to make the per-bit reception quality of a transmission bit string to approach evenly, thereby improving the communication capacity.
摘要:
In an equalizer arranged in a wireless communication device: information on correlation in one or more first wireless signals is generated; a channel vector is generated on the basis of the one or more first wireless signals; an extended, circulant matrix is generated; an extended channel vector is generated, the number of which is identical to the number of rows of the extended correlation matrix; and weight coefficients are calculated as a solution, in the frequency domain, of an equation expressed by the extended correlation matrix and the extended channel vector.