Abstract: A terminal of a communication system includes a power amplifier, an open-loop power controller, a gain controller, a modulator, and a digital/analog converter. The power amplifier amplifies transmission power of a transmission signal. The open-loop power controller measures a received signal strength to control the transmission power, and increases a gain of the power amplifier according to the received signal strength. The gain controller sets a power concentration gain and applies the power concentration gain to the transmission signal when the gain of the power amplifier is maximized. The modulator modulates the transmission signal. The digital/analog converter converts an input signal to an analog signal. The gain controller applies the power concentration gain to the trans mission signal modulated by the modulator, and transmits the power concentration gain to the digital/analog converter.

Abstract: A wireless data communication system includes a software defined radio (SDR) terminal having a wireless map, and accessing a desired wireless data service using the wireless map, wherein the wireless map includes GPS location information, information on wireless data services available at a current location of the SDR terminal based on the GPS location information and information on wireless connection software components for each wireless data service selected by the SDR terminal. The wireless data communication system further includes a base station for providing a wireless connection environment, an authentication center for authenticating the SDR terminal, a download server for providing the wireless connection software component to the SDR terminal, and a location-based service server for providing the wireless map to the SDR terminal.

Abstract: A transmission apparatus for a DS/CDMA system including a multiple-input multiple output MIMO antenna system is disclosed. The apparatus includes a transmitter for transmitting data by applying a different scramble code to each transmitted data through a plurality of transmitting antennas. The apparatus also includes a receiver for receiving the transmitted data by obtaining a diversity gain based on the maximum order of the diversity in order to effectively detect the data. The present invention achieves an excellent detection performance by receiving data with a full order of diversity, which is a multiple of the number of receiving antennas and the number of multipath, without complicated operation such as a decision feed equalizer.

Abstract: The invention relates to a call control method for handoff guarantee in a mobile terminal for minimizing handoff failure rate which continuously guarantees the same quality of service is during handoff of an existing call from the current cell into a new cell in a high-speed radio communication network which is constituted of micro-cells to support multimedia traffic. The bandwidth reservation is performed in the adjacent cells, call approval control is performed by temporarily storing a handoff request into a queue when an available bandwidth is insufficient, and a radio bandwidth is dynamically managed so as to efficiently use communication network resources. Further, new call block rate and handoff failure rate are periodically monitored for adaptation to dynamic variation of the communication network traffic state, by which the amount of a reserved bandwidth is dynamically adjusted according to the state so as to efficiently use communication network resources.

Abstract: A two-dimensional round-robin scheduling method with multiple selection is provided. The two-dimensional round-robin scheduling method in accordance with an embodiment of the present invention includes following steps. First step is for checking whether a request is received from the input buffer module and building mxm request matrix r(i,j), i,j=1, . . . , m. Second step is for setting mxm search pattern matrix, d(i,j), i,j=1, . . . , m. The search pattern matrix describes search sequence, S=1, . . . , m. Third step is for initializing elements of mxm allocation matrix a(i,j), i,j=1, . . . , m. The allocation matrix contains information whether transmission request is accepted and which switching plane the accepted request uses in transmission. Fourth step is for examining a request matrix in accordance with the search sequence S and finding r(i,j) that sent a request.

Abstract: A method for interfacing between a transmitter and receiver of a digital broadcasting system using a satellite, includes the steps of: searching a program association table of the receiver for a corresponding program, and detecting a receiver control message packet number; detecting a receiver control message through the detected packet number; detecting public switched telephone network and public switched data network numbers through the receiver control message; searching for a network information table of the receiver and then detecting an event information table packet number at a time zone corresponding to an event information table construction descriptor, in order to search for a corresponding event information table; inserting a VCR reserved recording descriptor into the event information table to impose an identification number on a corresponding program, thereby performing a reserved recording; inserting a price information descriptor table into the event information table to transmit program price

Abstract: This invention provides an opto-electronic integrated circuit for receiving optical signals as well as method for manufacturing the same in which both the receipt sensitivity and reliability are improved to achieve both high operation speed and process simplicity. This is accomplished by integrating the photo-detector and the amplifier on a single chip, which are essential elements of the optical receiver of the optical communication system. Also, layer between a PIN photo-detector and a junction-field effect transistor (JFET) is shared as large as possible through a two times epitaxial growth. In this way, the opto-electronic integrated circuit is optimized.