摘要:
An object of the invention is to obtain a high-speed and high-accuracy radio-wave propagation characteristic forecasting system in combination with the launching method by correctly estimating a diffraction phenomenon when a ray passes the vicinity of an edge of a structure. To estimate a radio-wave propagation characteristic in accordance with the ray launching method, when a ray passes the vicinity of an edge of a structure, a diffracted wave is generated at the edge if the distance between the edge and the ray is smaller than the radius of a ray spread. Thereby, it is easy to combine the ray launching method with the conventional ray launching method and it is possible to estimate a high-speed high-accuracy radio-wave propagation characteristic also considering a ray diffracted wave.
摘要:
To shorten a required estimation time while keeping an estimation precision in an object environment given for estimating propagation characteristics with a ray launching method. In the case where a ray is propagated within a given observation area, and collides with a barrier residing on its path, a space in the vicinity of the ray is divided into a plurality of partial spaces until a predetermined condition is satisfied. The space in the vicinity of the ray that is considered to cause a degradation in the estimation precision is divided in reflection until there is less influence of degradation, whereby each of the subdivided partial spaces can be handled individually, so that the estimation precision of radio wave propagation characteristics can be made better than a conventional method. On the other hand, in the case where there is possibly less influence of degradation in the estimation precision, the space is not divided, whereby if a ray is radiated from a transmitting antenna coarsely, the total number of rays is reduced below that of the conventional method, so that a total calculation time taken for a propagation estimation can be shortened.
摘要:
To provide a propagation environment notification method in radio communication allowing a user to easily understand radio propagation environment information. When receiving a service start command C1 from a user terminal 100, a server 102 transfers software for clients to the user terminal 100 (C2). The user terminal 100 starts the transferred software for clients, and a user condition inputting process P2 is carried out to collect user specific information and radio base station information and transfer the same to the server 102 (C3). When receiving the information, the server 102 starts a distribution information generating process P1 for generating radio propagation environment information based on the information, and the generated information is transferred to the user terminal 100 (C4), and is converted into a format convenient for the user by the software for clients transferred on the user terminal 100, and displayed on the user terminal 100 (P3).
摘要:
An object of the present invention is to provide a method for detecting a shield in predicting the radio wave propagation characteristics by a technique of the geometrical optics capable of detecting a content which a ray strikes, at high rate, when the ray is radiated within the observation space. In the case where the rays and the contents are given, the projected objects given by the line or plane are set up, and if an image of the content projected onto the projected object and an image of the ray projected onto the projected object do not intersect, the content is excluded from the shield detection object. A plurality of projected objects i (i=1 to M) are prepared, the selection of shield detection object is performed for each projected object i in order for i=1 to M, and the content of the shield detection object is concluded in sequence. Though the conventional method required the multiple variable equations to be solved for all the contents within the observation area, this invention allows the multiple variable equations to be solved only for the concluded contents of the shield detection object. Hence, the processing time can be shortened.
摘要:
An object of the invention is to obtain a high-speed and high-accuracy radio-wave propagation characteristic forecasting system in combination with the launching method by correctly estimating a diffraction phenomenon when a ray passes the vicinity of an edge of a structure. To estimate a radio-wave propagation characteristic in accordance with the ray launching method, when a ray passes the vicinity of an edge of a structure, a diffracted wave is generated at the edge if the distance between the edge and the ray is smaller than the radius of a ray spread. Thereby, it is easy to combine the ray launching method with the conventional ray launching method and it is possible to estimate a high-speed high-accuracy radio-wave propagation characteristic also considering a ray diffracted wave.
摘要:
An object of the present invention provides a method of predicting radio wave propagation characteristics that can implement a ray launching technique at higher speed. A plurality of Central Processing Units (CPUs) are interconnected via a network, and a recording device that can be read or written from all the CPUs is installed, and plural rays radiated from a predetermined transmitting point are divided into a plurality of groups, each group being assigned to a different CPU, whereby the CPUs perform a ray launching processing for the assigned rays independently and simultaneously to predict the radio wave propagation characteristics. The plural rays radiated from the transmitting point are divided and assigned to the CPUs, and the ray launching processing is performed simultaneously, resulting in a shorter computation time.
摘要:
A physical quantity measuring system includes an optical source which emits a measurement light to fiber Bragg grating (FBG) lines containing FBGs connected in cascade by an optical fiber, an optical switch including a common port for receiving the measurement light from the optical source, and input/output ports connected to the FBG lines, the optical switch outputting the measurement light, from the common port to each of the input/output ports at different time points, a wavelength separator which receives light reflected from the respective FBGs of the FBG lines, and separating the reflected light into a plurality of component lights having predetermined wavelengths, after the measurement light is output from the input/output ports, and optical receivers which receives the component lights from the wavelength separator and detects light intensities of the component lights.
摘要:
A method of butting and connecting a first optical fiber and a second optical fiber in an optical connector comprises placing said optical connector that holds said first optical fiber in wherein an optical fiber connection tool; mounting said optical fiber holder on a holder mounting base of a front end bevel processing tool; processing a front end face of said second optical fiber such that said front end face of said second optical fiber is beveled relative to the surface perpendicular to the optical fiber axis direction; transferring said optical fiber holder to said holder support base; and moving said optical fiber holder toward said optical connector along said guide part, and butting and connecting the beveled front end face of said second optical fiber to the front end face of said first optical fiber such that their bevel directions are aligned.
摘要:
There is provided a semiconductor integrated circuit including: a plurality of first logic blocks which are reconfigurable, the plurality of first logic blocks inputting data of a first bit width and performing computation; a first network connecting the plurality of first logic blocks in a dynamically reconfigurable manner; a plurality of second logic blocks inputting data of a second bit width different from the first bit width and performing computation; a second network connected to outputs of the plurality of second logic blocks; and a third network connecting a carry bit output of a computing unit included in the first logic block to an input of a computing unit included in the second logic block in a dynamically reconfigurable manner.
摘要:
Provided are a communication system and the like capable of making a stable relay route even when a propagation channel is fluctuated by the fluctuation of RSSI. For making a tree-type communication route whose root is a core node, each slave node, after the reception of the latest reset routing packet from a node, judges if the transmission source node should be the parent of the tree-type structure based on the sequential average of the reception power of n routing packets received from the same transmission source node. As the reception power is log-normally distributed in general, an asymptotically stable relay route can be obtained, especially by using the sequential average.