摘要:
In a wireless communication apparatus in a time division duplex system, a transmission signal generation unit generates a transmission signal. A power amplifying device amplifies the generated transmission signal. A control signal generation device generates a drain voltage control signal for control of the drain voltage of the power amplifying device, and a gate voltage control signal for control of the gate voltage of the power amplifying device. The switch unit switches off the drain power supply of the power amplifying device during reception in the time division duplex system according to the drain voltage control signal. In addition, the power amplifying device sets a higher gate voltage during reception in the time division duplex system higher than during transmission according to the gate voltage control signal.
摘要:
A phase tracking circuit includes a divider part dividing an input signal that includes data sub-carriers and pilot sub-carriers into groups so that each of the groups includes at least one of the pilot sub-carriers, and a correcting part correcting phases of data sub-carriers of the input signal included in one of the groups on the basis of an amount of phase rotation of the at least one of the pilot sub-carriers included in the above one of the groups.
摘要:
A disclosed group delay characteristic correcting device corrects group delay characteristics of an analog low-pass filter used to remove aliasing of a digital-analog converter or an analog-digital converter. The group delay characteristic correcting device includes a digital signal processing unit configured to have an all-pass phase circuit at a stage previous to the digital-analog converter or at a stage subsequent to the analog-digital converter so as to correct the group delay characteristics of the analog low-pass filter.
摘要:
A phase tracking circuit includes a divider part dividing an input signal that includes data sub-carriers and pilot sub-carriers into groups so that each of the groups includes at least one of the pilot sub-carriers, and a correcting part correcting phases of data sub-carriers of the input signal included in one of the groups on the basis of an amount of phase rotation of the at least one of the pilot sub-carriers included in the above one of the groups.
摘要:
A disclosed group delay characteristic correcting device corrects group delay characteristics of an analog low-pass filter used to remove aliasing of a digital-analog converter or an analog-digital converter. The group delay characteristic correcting device includes a digital signal processing unit configured to have an all-pass phase circuit at a stage previous to the digital-analog converter or at a stage subsequent to the analog-digital converter so as to correct the group delay characteristics of the analog low-pass filter.
摘要:
A radio communication system including a base station apparatus including a first memory to store a schedule for communication using each of a plurality of set values of a predetermined communication element in the physical layer, a first antenna to communicate with a terminal apparatus using a first set value of the plurality of set values in accordance with the schedule stored in the first memory, and a first processor to select a second set value of the plurality of set values if the condition of communication performed with the terminal apparatus by the first antenna using the first set value has deteriorated, and cause the first antenna to perform communication using the selected second set value in accordance with the schedule and the terminal apparatus including a second memory to store the schedule, a second antenna to communicate with the base station apparatus, and a second processor.
摘要:
A signal converter includes: a dielectric substrate; a first conductor layer disposed on one of opposite sides of the dielectric substrate, while including an input section receiving high-frequency signals inputted thereto; a second conductor layer disposed on the other of the opposite sides of the dielectric substrate; and plural first conducting sections penetrating the dielectric substrate for electrically connecting the first and second conductor layers, while forming a waveguide in the inside of the dielectric substrate with the first and second conductor layers. The first conductor layer is disposed on the dielectric substrate without occupying a separator section disposed on the dielectric substrate. The separator section includes first and second sections extend from the input section towards the waveguide. The first and second sections are separated away from each other for gradually increasing their interval in proportion to a distance away from the input section towards the waveguide.
摘要:
A waveguide substrate has improved signal conversion characteristic to a cavity waveguide at a post wall waveguide less suffering a manufacturing error occurring at a portion leading the signal to the cavity waveguide. The waveguide substrate has a converting part provided at a position shutting off an end of the waveguide, waveguide shutting-off conducting posts penetrating a dielectric plate to electrically conduct between conductor layers on the both surfaces of the dielectric plate, and two slit-like regions, in which no conductor layer is formed, arranged in parallel in the upper stream and the lower stream with respect to a direction of propagation of a high-frequency signal from the waveguide toward the waveguide shutting-off conducting posts.
摘要:
A detection and ranging system includes: a signal generator configured to generate M probe signals having different carrier frequencies; M transmitting elements configured to transmit the M probe signals; N receiving elements configured to receive an echo signal from a target; N demodulators provided for the N receiving elements, each of the demodulators being configured to generate a demodulated echo signal by demodulating an echo signal received by a corresponding one of the receiving elements by using at least one of the M probe signals, and to generate M sets of data signals corresponding to the M probe signals by filtering the demodulated echo signal in a frequency domain; and a signal processor configured to detect the target according to M×N sets of data signals generated by the N demodulators.
摘要:
A high-frequency module includes a stiffener (a support substrate), a resin base member of which one surface is fixed to the stiffener, a first conductive pattern formed on said one surface of the resin base member, a second conductive pattern formed on the other surface of the resin base member for constituting a waveguide in combination with the first conductive pattern to pass a high-frequency signal through the resin base member and including a window for allowing the high-frequency signal to pass therethrough, a cap for covering a semiconductor element and for absorbing or reflecting the high-frequency signal, an adopter (a waveguide tube) fixed onto the second conductive pattern such that one open end thereof surrounds the window, and an antenna fixed to the other open end of the adaptor.