摘要:
A radio communication apparatus includes antennas, transceiver units respectively connected to the antennas, and a radio control unit that controls the transceiver units, simultaneously inputs same transmission data to the transceiver units, and instructs, every switching cycle of frequency hopping, the transceiver units to start check processing for an idle state of frequency channels. The transceiver units respectively include hopping control units that switch the frequency channels every fixed time in synchronization with a communication partner and control such that each of the transceiver units uses a different frequency at the same hour. When determining that a frequency channel is in an idle state before a predetermined time elapses from the start of the check processing for an idle state, the transceiver units transmit the transmission data to the communication partner using the frequency channel.
摘要:
A radio communication apparatus includes antennas, transceiver units respectively connected to the antennas, and a radio control unit that controls the transceiver units, simultaneously inputs same transmission data to the transceiver units, and instructs, every switching cycle of frequency hopping, the transceiver units to start check processing for an idle state of frequency channels. The transceiver units respectively include hopping control units that switch the frequency channels every fixed time in synchronization with a communication partner and control such that each of the transceiver units uses a different frequency at the same hour. When determining that a frequency channel is in an idle state before a predetermined time elapses from the start of the check processing for an idle state, the transceiver units transmit the transmission data to the communication partner using the frequency channel.
摘要:
A control system includes a load including an operative part, and a control device for supplying AC power to the load through a power line and operating the operative part. The control device includes an interruption mechanism and a transmission mechanism. The load includes a controller. The transmission mechanism transmits a predetermined control signal to the load through the power line by blocking the power supply to the load by the interruption mechanism for a time duration shorter than a half cycle of AC output. The controller controls the operative part based on the control signal received from the control device.
摘要:
A transmitting apparatus adds a common pilot symbol and known series for each data slot of a subcarrier group. A receiving apparatus combines SIR calculation values obtained for each subcarrier group, and averages the SIR calculation values. Based on this, it is possible to obtain a high-precision SIR calculation value even when there is a level fluctuation such as shadowing.
摘要:
A mobile station sends reception signal quality information to a plurality of base stations. Each of the base stations determines the condition for processing a signal that is to be sent to the mobile station, processes the signal based on the condition determined, and sends the signal. The condition may be any one or more of a modulation method, an interleave length, a coding ratio, and a puncturing rule. The mobile station receives the signals, demodulates the signals to generate soft decision values corresponding to each signal, deinterleaves the soft decision values to obtain a deinterleaved result corresponding to each soft decision value, code-combines all the deinterleaved results, and subjects the combined results to error-correction decoding processing.
摘要:
A control system includes a load including an operative part, and a control device for supplying AC power to the load through a power line and operating the operative part. The control device includes an interruption mechanism and a transmission mechanism. The load includes a controller. The transmission mechanism transmits a predetermined control signal to the load through the power line by blocking the power supply to the load by the interruption mechanism for a time duration shorter than a half cycle of AC output. The controller controls the operative part based on the control signal received from the control device.
摘要:
A signal generation device includes: filter banks that perform sampling frequency conversion with respect to an input signal of a predetermined sampling frequency, and generate a signal obtained after the sampling frequency conversion as an output signal; a control-signal generation unit that selects the filter banks to be used based on a sampling-frequency setting value indicating a sampling frequency of the output signal: and a switching unit selects the filter banks based on a result of selection by the control-signal generation unit.
摘要:
The transmitter comprises a data/modulation control section (4) which sets predetermined parameters necessary for demodulation processing, sub-carrier group modulation processing sections (6a to 8c) which perform frequency spreading for each sub-carrier signal in the sub-carrier group, and time spreading sections (10a to 10c) which multiplex all signals after the modulation processing and the frequency spreading for each sub-carrier signal, and perform time spreading with respect to the multiplexed signals. The receiver comprises time despreading sections (35a to 35c) which perform time despreading for each sub-carrier signal, and sub-carrier group demodulation processing sections (36a to 38c) which perform frequency despreading for each sub-carrier signal after the time despreading.
摘要:
A path detector (140) detects a plurality of multi-path waves that have satisfied a predetermined standard from reverse spread signals, a plurality of adders (161) form beams on the basis of a path, a plurality of transfer path estimating sections (170) and complex conjugate calculators (163) calculate a transfer path estimation value, and based upon the result of the estimation, carry out a weighting process in accordance with the signal amplitude and a removing process of the phase variations. Moreover, a plurality of interference amount estimating sections (171) extract the amount of interference, a plurality of normalizing sections (172) normalize the signals that have been subjected to the phase variation removing process based upon the amount of interference, an adder (185) combines all the signals that have been normalized, and a data determining section (190) determines the signal that have been combined.
摘要:
A communication control unit in accordance with the present invention comprises a channel quality detection unit that includes a differential block for calculating a double differential phase by performing a plurality of times differential on a received signal and a signal lagging behind the received signal by a predetermined time, a frequency calculation block for calculating a frequency by which the double differential phase falls into a pseudo-error area within a predetermined observation time, and a quality index calculation block for calculating an index of the quality of a channel on the basis of an output of the frequency calculation block, and that calculates an index of the quality of a channel employed using a received signal, a quality decision unit for deciding from the result of channel quality index calculation performed on the channel employed which is provided by the channel quality detection unit whether or not a channel is good, a control unit for controlling the channel according to the result of channel quality decision which is provided by the quality decision unit. Consequently, the communication control unit can achieve channel control successfully.