Samsung Electronics Co., Ltd.

Sung-Chul Hong

Jin-wook Lee

Sang-yoon Jeon

Doo-Yong Yang

Young-Yoon Woo

Tae-Young Kil

Sun-hee Park

Sang-Woong Yoon

Yong-Gyo Seo

Sang-Min Nam

Ha-Hong Kim

Tae-Hong Ahn

Young-Uk Ko

Sung-Mok Yu

Ui-Sik Yoon

A Doherty power amplification apparatus and method using a combined cell are provided. The Doherty power amplification apparatus includes, a power splitter for splitting an input power, and outputting the split powers to a carrier amplification unit and (N&#x2212;1) peaking amplification units, wherein the carrier amplification unit, including M carrier power amplifiers, for amplifying power output from the power splitter; the (N&#x2212;1) peaking amplification units, each of which includes M peaking power amplifiers, for amplifying the respective split powers output from the power splitter, and a power combiner for combining a power amplified by the carrier amplification unit and the respective split powers amplified by the (N&#x2212;1) peaking amplification units, and for outputting the combined power, wherein N represents an integer obtained by adding a number of the carrier amplification units and a number of the (N&#x2212;1) peaking amplification units, and M represents an integer which is equal to or more than 1.

Combined cell doherty power amplification apparatus and method

An apparatus and method for maximizing the performance of a peaking amplifier in a Doherty amplifier are provided. The apparatus includes a splitter, a carrier amplifier, an (N&#x2212;1) number of peaking amplifiers, a Doherty combiner, and an output load. The splitter splits an input signal into an 'N' number of power signals. The carrier amplifier amplifies the signal provided from the splitter using a first Direct Current (DC) bias. The peaking amplifiers amplify the signals provided from the splitter using a second DC bias, which is lower than the first DC bias. When the carrier amplifier and the peaking amplifiers are all operating, the Doherty combiner forms a load impedance of the respective amplifiers such that the load impedance of the peaking amplifiers are less than the load impedance of the carrier amplifier. The output load outputs the signals amplified by the carrier amplifier and the peaking amplifiers.

Apparatus and method for maximizing performance of peaking amplifier in doherty amplifier

An apparatus for providing inter-processor communication (IPC) using transmission control protocol/Internet protocol (TCP/IP) in a communication system, including: an Ethernet interface module for providing an interface between an Ethernet device driver and an interprocessor communication (IPC) module, determining a type of a received message, transmitting the received message to a message process module if the type of the received message is non-frame data, and queuing the received message in a corresponding mailbox corresponding to frame data if the type of the received message is the frame data; a message process module for queuing the non-frame data received through the Ethernet interface module in a corresponding mailbox; and a common application programming interface (API) module for providing an interface for basically performing data transmission and reception through the message process module, mailbox management, interprocessor communication (IPC) buffer management and an interprocessor communication (IPC) control function.

Apparatus for providing inter-processor communication using TCP/IP in communication system

An Internet Protocol telephony exchange system and a call control method thereof. The exchange system integrates an IP terminal and a legacy terminal in a single exchange system, controls a call of the IP terminal in the same manner as an extension subscriber, and contains at least one IP terminal connected to the IP network. The IP terminal contains a user interface for generating user information or converting received user interface information into information of a user-identifiable state, and performs a VoIP function in compliance with one or more of a H.323, a MGCP and an SIP protocol procedure. The IP network is connected to an IP driver and an IP-PBX (Internet Protocol-Private Branch Exchange). The IP driver controls an IP end point at which the IP terminals are positioned, upon receiving IP terminal connection information and call control information based on H.323/MGCP/SIP protocol procedure.

Internet protocol telephony exchange system and call control method thereof

Disclosed is a method for informing a mobile communication terminal of an entrance into a specific service network in a mobile communication system and a method for changing an incoming call indication mode to a vibration or silent mode. The method for informing a user of a private mobile communication service possible area when a mobile communication terminal enters a private mobile communication network being interoperable with a public mobile communication network includes the steps of: a) upon receiving a system parameter message being broadcast by the private mobile communication system, checking a predetermined bit for indicating the private mobile communication service area contained in the system parameter message, and determining whether the mobile communication terminal exists in the private mobile communication service area; b) if the mobile communication terminal exists in the private mobile communication service area, transmitting a location registration message having a predetermined registration type to the private mobile communication system; c) receiving a message indicating a private mobile communication service possible state from the private mobile communication system according to registration result information of the private mobile communication system; and d) informing the user of the private mobile communication service possible state.

Method for informing mobile communication terminal of entrance into specific service network in mobile communication system and method for changing incoming call indication mode to vibration or silent mode

A differential type VCO (Voltage Controllable Oscillator) is disclosed. The VCO has a differential amplifier having a couple of transistors and a couple of LC tanks. At each LC tank, a transformer is connected to form a buffer. An oscillating signal is output through the buffer with no power consumption. Additionally, a capacitor is connected to the secondary coil of the transformer to form a bandpass filter, thereby attenuating a harmonic signal included in the oscillating signal.

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Hwaseong-si, South Korea

Sung-Chul Hong