摘要:
When retransmission requests are issued based on the results of error-correction decoding of received data packets to perform data transmission, statistical information indicating whether received data packets have been successfully decoded or have not been decoded is acquired, and based on the rate at which correct decoding has been made or the rate at which correct decoding has not been made, which is obtained from the statistical information, a request is transmitted to the transmission source to change the window size, which is the number of data units handled in a predetermined layer, so that when for example the communication environment is not excellent, processing can be performed at a small window size, and the occurrence of circumstances in which data retransmission and the discarding of received data are repeated can be efficiently prevented. Accordingly, data transmission efficiency in a wireless transmission system performing high-speed data transmission is improved under conditions of a poor radio wave environment.
摘要:
In a case of being judged that a compressed mode is applied in a mobile terminal, if it is judged that reception quality during data communication is favorable, gap intervals are not created by passing through a processing of gap interval creation. Further, if the data communication over the HS-DSCH is performed, the data communication over the HS-DSCH is continued. This prevents degradation of data transmission rate over a channel for high speed data transmission service, in the presence of a mobile terminal in a favorable reception quality area.
摘要:
Disclosed herein is a method of receiving a spread-spectrum signal in a radio communication terminal device having a plurality of demodulators for demodulating a received spread-spectrum signal, comprising the steps of detecting when at least one of a plurality of demodulators is temporarily unable to properly demodulate the received spread-spectrum signal, determining whether or not there is a demodulator which is not being used other than the at least one of the demodulators, and continuing a demodulating process of the at least one of the demodulators, if there is a demodulator which is not being used. Thus, according to the present invention, the time in which the demodulator is unlocked is minimized, and a stable, high-quality signal can be received.
摘要:
A circuit that compensates for distortion of an output signal of a power amplifying circuit of a transmitting section of a base station or a terminal of a radio communication system and apparatus such as a mobile phone, and a predistorter system applicable to radio communication systems and that does not depend on a use system other than generation of envelope change due to a high-frequency input signal without addition of the distortion compensating circuit to a base band portion, the compensating circuit including a memory device where inverted distortion data of a high-frequency power amplifying device for a mobile phone are stored is driven with data obtained by detecting an envelope of a high-frequency input signal having envelope change as an address and distortion compensation of the power amplifying device is made by adjusting a variable gain device provided at a prestage of the power amplifying device.
摘要:
A pilot signal detection method and a receiver, in which a search window having a predetermined time width is generated at every substantially constant time interval, and pilot signals existing in search window thus generated are detected. The position of the search window of each period is set in accordance with the delay amount between the timing (T_ref) of the first pilot signal and the timing (T_last) of the last pilot signal detected in the immediately preceding search window.
摘要:
A compact GPS receiver includes a GPS antenna composed of a patch and a ground plane to receive high frequency satellite signals, an analog circuit which processes the high frequency satellite signals into a digital signal, a digital circuit which processes the digital signal to compute positional coordinates of the GPS antenna, and an interface connector which outputs the positional coordinates to an external device. A substrate is provided to support the GPS antenna, the analog circuit, the digital circuit, and the interface connector. An EMI (electromagnetic interference) shield is provided to shield at least the digital circuit to block a noise developing at the digital circuit from interfering with the GPS antenna. The GPS antenna is mounted on the EMI shield to share the ground plane with the EMI shield, while keeping the patch insulated electrically from the EMI shield. Thus, the GPS receiver can be made compact by making the use of the EMI shield also as the ground plane of the antenna, while assuring to block the noise from interfering with the antenna and affording sufficient antenna gain with the increased ground plane.
摘要:
A colorless chromate coating film is formed on a bright aluminum wheel by subjecting the surface of an aluminum wheel to a cathodic electrolytic treatment in an acidic aqueous solution containing not less than 2 g/l of hexavalent chromium ions, 20 to 2,000 ppm of sulfate ions, 10 to 400 ppm of fluorine (F) as fluoride and not less than 20 ppm of zirconium ions at a pH of 0.6 to 1.7 at a current density of 0.5 to 15 A/dm.sup.2 for at least 30 seconds, thereby forming a coating film with a chromium coating amount of 50 to 250 mg/m.sup.2.
摘要:
An imaging device includes an optical system including a zoom lens and a focus lens, a driver to drive the zoom lens and the focus lens, an image sensor to convert an optical image of a subject formed via the optical system into an electric signal and output the signal as an image signal, an image processor to generate image data of the subject according to the image signal, a digital zoom element to perform digital zoom on the basis of the image data; and a position detector to detect a position of the zoom lens, wherein the digital zoom element is configured to perform the digital zoom even when the zoom lens position has not reached a telephoto end.
摘要:
An imaging apparatus includes an imaging lens forming an optical image of a subject, an image pickup device outputting an image signal according to the optical image of the subject, a display device displaying a subject image according to the image signal, an image processor converting the image signal to data in an image data format to be displayed on the display device, and a storage device storing a plurality of pieces of positional information respectively specifying a plurality of enlargement areas to be enlarged in the subject image. The image processor has an enlarged image generation device generating an enlarged image of each of the plurality of enlargement areas based on the positional information stored in the storage device, and an enlargement display device displaying the plurality of enlarged images on the display device.
摘要:
An ultrasound probe includes a transducer array for a B-mode image which transmits and receives an ultrasonic beam for a B-mode image, and a transducer array for sound speed measurement which is laminated and formed above the transducer array for a B-mode image and receives an ultrasonic beam for sound speed measurement.