摘要:
A drain diffusion layer 11b includes a low impurity concentration region 5a and a high impurity concentration region 5b, and the low impurity concentration region 5a is located on the channel region side. An impurity layer 7 having an opposite conductivity type to the drain diffusion layer 11b is formed in the channel region, at a position away from the low impurity concentration region 5a by a distance T. Alternatively, the low impurity concentration region 5a and the impurity layer 7 are located so as to contact each other. Still alternatively, a border impurity layer is provided between the low impurity concentration region 5a and the impurity layer 7. Thus, a semiconductor device including a high voltage transistor capable of suppressing the reduction of the electric current driving capability and performing stable driving, and a method for fabricating the same, can be provided.
摘要:
In network groups adjacent to each other constructed by communication apparatuses notifying beacons, the communication apparatuses can exchange necessary data between themselves, avoiding interference. Communication stations in a group set one beacon period to operate the network group. A communication station in the group acquires a beacon period and a reservation period of an adjacent group, sets its own reservation period avoiding the acquired beacon period and reservation period, and as necessary, enters the adjacent group to exchange necessary data. A device shared by a plurality of users does not belong to any group, and a communication apparatus in a different group temporarily enters the beacon period as necessary to exchange data.
摘要:
Disclosed is a method that preferably performs transmission processing to a time sequence signal of a known pattern as the pre-amble and an OFDM transmitted signal. In data communications, the general practice defines the pre-amble and detects the peaks of the mutual correlation to thereby detect synchronization. The pre-amble here is defined by the binary value in most cases for simplification of a correlation detecting device. In this case, the spectrum becomes irregular with sharp peaks and dips, which deteriorates the correlation characteristic. The method of the invention forcibly adjusts the spectrum amplitude of the pre-amble pattern on the transmitting side while retaining the phase information thereof, and thereby the method improves the spectrum and correlation characteristics while securing simplification of a correlation detecting device on the receiving side.
摘要:
A transmitting apparatus, receiving apparatus, communication system, and a signal processing method for each apply a suitable modulation method and transmission path estimation method in accordance with the characteristics of the transmission information and capable of improving the transmission efficiency. At the transmission side, the method of estimation of the transmission path and the modulation method are selected in accordance with an attribute of the data to be transmitted, for example, the size of a packet to be transmitted, the transmission data is mapped by the selected modulation method, the signal is processed in accordance with the transmission path estimation method, and a transmission signal is created by increase fast Fourier transform processing and transmitted. At the reception side, the received signal is fast Fourier transformed, the transmission path is estimated by the transmission path estimation method selected at the transmission side, the received signal is corrected in accordance with the result, and the received data is reproduced in accordance with the modulation method. Therefore, it is possible to always adopt the optimum transmission method in accordance with the attribute of the transmission data etc. and possible to realize an improvement of a transmission efficiency and an enhancement of the quality of communication.
摘要:
A transmitting apparatus, receiving apparatus, communication system, and a signal processing method for each apply a suitable modulation method and transmission path estimation method in accordance with the characteristics of the transmission information and capable of improving the transmission efficiency. At the transmission side, the method of estimation of the transmission path and the modulation method are selected in accordance with an attribute of the data to be transmitted, for example, the size of a packet to be transmitted, the transmission data is mapped by the selected modulation method, the signal is processed in accordance with the transmission path estimation method, and a transmission signal is created by increase fast Fourier transform processing and transmitted. At the reception side, the received signal is fast Fourier transformed, the transmission path is estimated by the transmission path estimation method selected at the transmission side, the received signal is corrected in accordance with the result, and the received data is reproduced in accordance with the modulation method. Therefore, it is possible to always adopt the optimum transmission method in accordance with the attribute of the transmission data etc. and possible to realize an improvement of a transmission efficiency and an enhancement of the quality of communication.
摘要:
A transmitting apparatus, receiving apparatus, communication system, and a signal processing method of each applying a suitable modulation method and transmission path estimation method in accordance with characteristics of the transmission information for improving the transmission efficiency operate so that at the transmission side, the ratio of adding transmission path estimation pilot symbols is suitably controlled in accordance with an aspect of the dat transmitted, for example, the size of the packets transmitted and the state of the transmission path, wherein the transmission data is mapped by the selected modulation method, and the signal is processed in accordance with the method of estimation of the transmission path, and the transmission signal is produced by inverse fast Fourier transform processing and transmitted. At the reception side, the received signal is fast Fourier transformed, the transmission path is estimated by the transmission path estimation method selected at the transmission side, the received signal is correct in accordance with result, and the received data is reproduced in accordance with the modulation method. Therefore, it is possible to always adopt the optimum transmission method in accordance with the attribute of the transmission data etc. and possible to realize an improvement of a transmission efficiency and an enhancement of the quality of communication.
摘要:
A transmitting apparatus, receiving apparatus, communication system, and a signal processing method for each apply a suitable modulation method and transmission path estimation method in accordance with the characteristics of the transmission information and capable of improving the transmission efficiency. At the transmission side, the method of estimation of the transmission path and the modulation method are selected in accordance with an attribute of the data to be transmitted, for example, the size of a packet to be transmitted, the transmission data is mapped by the selected modulation method, the signal is processed in accordance with the transmission path estimation method, and a transmission signal is created by increase fast Fourier transform processing and transmitted. At the reception side, the received signal is fast Fourier transformed, the transmission path is estimated by the transmission path estimation method selected at the transmission side, the received signal is corrected in accordance with the result, and the received data is reproduced in accordance with the modulation method. Therefore, it is possible to always adopt the optimum transmission method in accordance with the attribute of the transmission data etc. and possible to realize an improvement of a transmission efficiency and an enhancement of the quality of communication.
摘要:
It is aimed at performing an inverse FFT for ranging and efficiently estimating channel characteristics of a time response. It is highly possible that the UWB standardization adopts OFDM systems. A transmission estimation section inevitably acquires estimation values for a frequency region. The ranging is a representative feature of the UWB and requires channel estimation values for time response. For this reason, an inverse FFT needs to be performed for conversion. Frequency region smoothing means is used for time response limitation to prevent additional large FFTs from being provided for the ranging. It is therefore possible to acquire time responses using fewer FFT points than for ordinary data reception.
摘要:
In a jig for inspecting a device provided with at least a radio frequency signal terminal and an earth terminal, a metal block is formed with a through hole extending in a first direction. A contact probe is inserted into the through hole. The contact probe is provided with a metal pipe extending in the first direction. A plunger is retractably projected from one longitudinal end of the metal pipe to be brought into contact with the radio frequency signal terminal. At least two dielectric ring members are provided on an outer periphery of the metal pipe, and fitted with the through hole while forming a gap between the outer periphery of the metal pipe and an inner wall of the through hole, in order to form a coaxial path in which the contact probe serves as a core conductor and the metal block serves as an external conductor. A diameter of the through hole and a diameter of the dielectric ring members are selected such that the coaxial path has a predetermined impedance relative to the radio signal frequency terminal.
摘要:
A receiving device makes the data conducted a high precision maximum likelihood sequence estimation and after transmission it can be restored with further improved accuracy. Since the receiving device (31, 32) for outputting a received signal (S27) upon receiving the transmission signal, the weighting circuit (35) for calculating the weight coefficient showing the reliability of slot by which said received signal is transmitted based on the received signal transmitted from the receiving device and multiplying this weight coefficient by the received signal and outputting it, and the decoding circuit (16) for decoding the received signal (S29) to be transmitted from the weighting circuit and restoring the data transmitted are provided, the maximum likelihood sequence estimation can be conducted upon adding the reliability of slot in the decoding circuit, and thereby, even in the case where the qualities of communications vary by slot, the transmitted data can be restored with further improved accuracy by conducting a high precision maximum likelihood sequence estimation.