A mechanism for context awareness proximity-based establishment of wireless communication connections can be implemented in Bluetooth-compatible devices for simplifying procedures for device discovery, connection, service discovery, and content exchange In response to determining to execute a context task associated with an application associated with a first communication device, the first communication device can determine whether a second communication device is within a threshold detection distance from the first communication device If the second communication device is within the threshold detection distance from the first communication device, the first communication device can establish a communication link with the second communication device based, at least in part, on one or more connection parameters associated with the second communication device The first communication device can determine whether to execute the context task based, at least in part, on a service list associated with the second communication device and the context task

Context awareness proximity-based establishment of wireless communication connection

In an elastic wave device, an electrode, which is formed in a comb-like shape and is made of conductive material having a prescribed thickness, is arranged on a substrate of a piezo-electric element containing lithium niobate as a main component Also, in this elastic wave device, a surface of the substrate is set to a plane which is obtained by rotating a plane perpendicular to a crystal Y-axis of the lithium niobate by an angle ranging from 55 degrees to 57 degrees around a crystal x-axis of the lithium niobate, and a duty ratio (a width w of an electrode finger/an arrangement interval p of a pair of electrode fingers) of each of a plurality of electrode fingers composing the electrode is equal to or higher than 04 and is lower than 10

Elastic wave device

A transmitter has a power amplifier (40) to amplify an input signal having amplitude modulation, a supply voltage controller (10) to control a supply voltage of the power amplifier (40) according to the envelope, a sensor (R1) for sensing a modulation of a current drawn by the power amplifier (40), a delay detector (20) for detecting a delay of the controlled supply voltage relative to the sensed current, and a delay adjuster (30) for compensating the relative delay according to the detected delay. By sensing a current drawn, the delay detected can include any delay contributed by the power amplifier (40) up to that point, and yet avoid the more complex circuitry needed to derive the delay from an output of the power amplifier. Thus the distortion and out of band emissions caused by differential delays can be reduced more effectively.

Rf transmitter with compensation of differential path delay

A mobile terminal allocates data to a first wireless interface using a first communication network and a second wireless interface using a second communication network and executes wireless communication. The mobile terminal executes Web access to a server using the first wireless interface and acquires an authentication screen from the server. The mobile terminal executes Web access to a predetermined Web page, which is confirmed not to exist in advance, using the first wireless interface after the Web access is executed performed, and suppresses the allocation of the data to the second wireless interface when the Web access succeeds.

Wireless communication apparatus, wireless communication method, and computer-readable recording medium

An object of the invention is to provide a polar modulation transmitter that can perform adaptive distortion compensation processing without the need for a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal of a power amplifier. An adaptive operation control section 1501 measures the unbalance amount of an output spectrum of a power amplifier 1 and a coefficient adjustment determination section of the adaptive operation control section 1501 performs iteration control so that if the unbalance amount is equal to or greater than a predetermined threshold value, coefficient information output to a distortion compensation processing circuit 1301 is adjusted and an adjustment is made to distortion compensation processing in the distortion compensation processing circuit 1301 and if the unbalance amount is less than the predetermined threshold value, the coefficient information is maintained, whereby the characteristic change of the power amplifier 1 at the environmental temperature change time can be adaptively compensated for without using a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal from the power amplifier 1.

Polar modulation transmitter, adaptive distortion compensation processing system, polar modulation transmission method, and adaptive distortion compensation processing method

PROBLEM TO BE SOLVED: To provide a low-loss electrode for high frequency circuit, for which a surface effect is reduced, for a circuit such as a transmission line or resonator to be used in a high frequency area. SOLUTION: Concerning structure, plural metal films 11-13 on which high frequency currents flow, dielectric films 21-22 for separating he metal films 11-13 and connection conductors 31-32 for connecting the plural metal films 11-13 are provided and the metal films 11-13 and the dielectric films 21-22 are mutually laminated. Since the plural metal films 11-13 are electrically connected by the connection conductors 31-32 at the peripheral edge part or central part of metal films 11-13, the high frequency current flows while being distributed to the plural metal films 11-13. Thus, the electrode for high frequency circuit, for which the concentration of currents onto the surfaces of metal films is relaxed and the loss in the high frequency area is reduced in comparison with an electrode composed of a single metal film, is provided.

Electrode for high frequency circuit, transmission line and resonator using the same

PROBLEM TO BE SOLVED: To prevent deterioration in modulation spectrum due to a propagation delay difference between an amplitude component signal and a phase component signal in a transmission system adopting a polar coordinate modulation system. SOLUTION: A signal delay means 10 changes a delay amount of the amplitude component or the phase component so as to minimize a distortion amount of an output modulation signal of a power amplifier 150. Or the delay amount is changed so that the modulation signal includes a particular frequency component by using a chirp signal in place of the modulation signal, so that timing of the phase component signal is matched with timing of the amplitude component signal in the power amplifier 150, to realize radio equipment which is decreased in distortion of the modulation spectrum and enhanced in power efficiency of the power amplifier. COPYRIGHT: (C)2005,JPO&NCIPI

Transmitter and receiver

PROBLEM TO BE SOLVED: To provide a small filter which has the satisfactory damping characteristic with small loss in a high frequency area and also has the stable characteristic against its external environment. SOLUTION: This filter has a specific structure where the input/output coupled circuits 102-103 are connected to a ring resonator 101 with a distance of 1/4 ring length secured between them and accordingly the discontinuity is caused in terms of an electromagnetic field at a position 107 that is symmetrical to the coupling points 105-106 of the circuits 102-103. Then a negative resistance circuit using a distributed coupling line 104 connected to a ring resonator line and a transistor is added to connect together two modes orthogonal to each other in the resonator 101. Thus, a two-stage filter is constructed by a single resonator so that a small plane filter is obtained. Furthermore, the satisfactory damping characteristic is attained for the plane filter since a damping pole is produced at a place near a passing band.

Dual mode filter

PROBLEM TO BE SOLVED: To attain a state wherein users can easily communicate with each other without going through a troublesome setting procedure and to prevent authentication information from being monitored by a third person as much as possible. SOLUTION: An information terminal 100 comprises: a radio communication part 126 for performing radio communication with opposite equipment 200; a contact interface part 110 for detecting contact with the opposite equipment 200 on the basis of the detection output of a contact sensor 111 arranged on the surface of the case body of the information terminal; and a radio communication setting part 127 for performing an authentication processing for the radio communication by the radio communication part 126 in the case that the contact with the opposite equipment 200 is detected by the contact interface part 110. In the case that the contact with the opposite terminal 200 is detected by the contact interface part 110, the information terminal 100 exchanges the authentication information required for setting the radio communication with an opposite terminal 200 through the radio interface part 120. COPYRIGHT: (C)2006,JPO&NCIPI

Radio information terminal

PROBLEM TO BE SOLVED: To promote a spreading of an automatic toll collection system, etc., by working out a users advantage to have an on-vehicle device being an individual burden. SOLUTION: An advertisement data provided by an advertiser is transmitted from a road side machine 30 to the on-vehicle device 10 transmitting/receiving a signal with the road side machine 30 installed at a tollgate and the on-vehicle device 10 indicates it on an indication part 22 of a navigation device 20. Since the user has a pleasure for watching the advertisement and can get a useful information, the user is motivated to purchase the on-vehicle device. A spreading of the on-vehicle device can be promoted by giving a privilege such as a discount of a toll of a toll road, etc., to the user if the user receives the advertisement. COPYRIGHT: (C)2002,JPO

道明松尾

Papers

Electrode for high frequency circuit, transmission line and resonator using the same

Transmitter and receiver

Dual mode filter

Radio information terminal

Advertisement distribution system

道明 松尾

Papers

Electrode for high frequency circuit, transmission line and resonator using the same

Transmitter and receiver

Dual mode filter

Radio information terminal

Advertisement distribution system

道明松尾