Patent application number | Description | Published |
20080249739 | Apparatus for Determining Diameter of Parabolic Antenna and Method Therefor - Provided are an apparatus and method for determining a diameter of a reflector antenna. The apparatus includes a setting unit for setting up electrical characteristic values of the reflector antenna upon receipt thereof from outside, a parameter input unit for receiving a frequency, an antenna diameter variable value, antenna efficiency, Edge Taper (ET), and an Edge Of Coverage (EOC) angle as parameters for each of multiple frequencies to be accommodated in the reflector antenna, a graph generator for generating, on one rectangular coordinate, a graph representing the relationship between an antenna diameter and EOC directivity with respect to the EOC angle based on the parameters for each frequency received through the parameter input unit, an antenna diameter determination unit for determining an antenna diameter that simultaneously meets the preset EOC directivities for the frequencies to be accommodated in the reflector antenna by using the graph generated by the graph generation unit, and a graph output unit for mapping and outputting the graph generated by the graph generation unit on one rectangular coordinate with an antenna diameter axis and an EOC directivity axis to thereby represent the antenna diameter determined by the antenna diameter determination unit on the graph. | 10-09-2008 |
20080309419 | Voltage Controlled Oscillator Capable of Tuning Negative Resistance - Provided is a voltage controlled oscillator having a new type of a resonator and a negative resistance part capable of finely tuning negative resistance. Thus, the voltage controlled oscillator has an excellent quality factor characteristic and can finely tune the negative resistance even after its fabrication is completed. The voltage controlled oscillator having an active element includes: a resonating unit for generating an oscillation frequency according to a resonance capacitance; a frequency tuning unit, connected to a source terminal of the active element, for tuning the oscillation frequency; and a negative resistance adjusting unit, connected to the frequency tuning unit, for generating a negative resistance to adjust the oscillation frequency, the negative resistance adjusting unit including a varactor diode for finely adjusting the negative resistance. | 12-18-2008 |
20090154458 | REPETITION APPARATUS AND METHOD FOR REPEATEDLY TRANSMITTING AND RECEIVING DATA PACKET USING DIFFERENT PUNCTURING PATTERNS - Provided are repetition apparatus and method for repeatedly transmitting and receiving a data packet using different puncturing patterns to overcome signal attenuation and fading in a high speed mobile environment by repeatedly transmitting the duplicated information bit sequences with parity bits having a different puncturing pattern after channel-encoding the duplicated information bit. The repetition apparatus for repeatedly transmitting a data packet, includes a dual data generator for generating duplicated information bit sequences identical to each of information bit sequences to transmit, a channel encoder for dividing each of the duplicated information bit sequences into a plurality of information bits, and generating coded data packets alternately having a plurality of parity bits according to different puncturing patterns for each of the divided information bits, and a transmitter for transmitting the generated coded data packets sequentially. | 06-18-2009 |
20090268841 | POWER CONTROL SYSTEM AND METHOD FOR COMMUNICATION SYSTEM USING SPACE-TIME TRANSMIT DIVERSITY SCHEME - A power control system and method for communication system using space-time transmit diversity scheme. In the power control method, transmission power information of a plurality of antennas or a plurality of subcarriers is monitored. A new space-time code is generated by concatenating the monitored transmission power information and symbols to be transmitted. Symbols encoded using the generated space-time code are generated and the encoded symbols are transmitted. Accordingly, after determining the transmission power of each antenna, the transmission power information is monitored so that the transmission power information that does not experience the channel gain can be used at a next slot. Therefore, the performance degradation due to the round trip time can be reduced, thereby improving the system capacity and performance. | 10-29-2009 |
20090274246 | APPARATUS AND METHOD FOR PHASE RECOVERY USING INDEPENDENTLY DECODABLE COMPONENT CODES OF CHANNEL CODE IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method for phase recovery in a wireless communication system employs independently decodable component codes. The apparatus includes a decoding unit for decoding the input signal to thereby output the decoding value; an estimation unit for estimating phase errors of the received signal by estimating phase errors of the each component codeword in the received signal to thereby generate phase error estimation values; and a correction unit for correcting the phase of received signal using the phase error estimation values to thereby generate the phase corrected signal in an effective manner. | 11-05-2009 |
20100015972 | METHOD AND APPARATUS FOR HANDOVER IN MOBILE COMMUNICATION NETWORK INCLUDING SATELLITE NETWORK - Provided are a method and mobile communication terminal for handover in a mobile communication network including at least one mobile communication base station and a communication satellite. The handover method includes the steps of: (a) calculating a signal power received from a currently communicating mobile communication base station among the at least one mobile communication base station; (b) calculating a signal power received from each of the communication satellite and the at least one mobile communication base station except the base station of step (a); (c) selecting a mobile communication base station having the highest among the calculated signal powers except the signal power received from the communication satellite and the signal power received from the base station of step (a); and (d) when the signal power calculated in step (a) is below a predetermined minimum handover power, a difference between the signal power of the selected mobile communication base station and the signal power calculated in step (a) is equal to or below a first terrestrial handover sensitivity, and there is no other mobile communication base station capable of communicating with the mobile communication terminal, performing handover to the communication satellite. | 01-21-2010 |
20100123620 | NGSO COMMUNICATION APPARATUS FOR EXTENDING OPERATION TIME AND REDUCING NUMBER OF SATELLITES USING ATC, AND ATC AND OPERATING METHOD THEREOF - Disclosed are a non geostationary satellite orbit (NGSO) communication apparatus that extends an operation time using an ancillary territory component (ATC) and reduces a number of satellites, and an ATC and an operating method thereof. The NGSO communication apparatus for extending an operation time using an ATC and reducing a number of satellites may include a first ATC that communicates with a mobile earth station (MES), and a second ATC that communicate with the first ATC to relay data between the MES and the satellite when the first ATC is unable to communication with the satellite revolving along an orbit. | 05-20-2010 |
20100128656 | SATELLITE, MOBILE TERMINAL, AND COMPLEMENTARY TERRESTRIAL COMPONENT IN OFDM BASED MULTI-BEAM SATELLITE SYSTEM REUSING THE SAME FREQUENCY BAND FOR ALL THE BEAMS, AND COMMUNICATION METHOD THEREOF - Provided is a communication method of a mobile terminal in an orthogonal frequency division multiplexing (OFDM) based multi-beam satellite system reusing the same frequency band for all the beams, the method including: receiving location information of the mobile terminal from a satellite to determine a location of the mobile terminal within multiple beams; determining a subcarrier group for a communication with the satellite according to the location of the mobile terminal within the multiple beams; and communicating with the satellite using the subcarrier group for the communication with the satellite. | 05-27-2010 |
20100135198 | APPARATUS FOR MOBILE SATELLITE COMMUNICATIONS AND METHOD OF CONTROLLING COMMUNICATIONS ROUTE - A mobile satellite transmission/reception apparatus and a communications route control method using the same are disclosed. The mobile satellite transmission/reception apparatus comprises: a first antenna unit configured to receive a signal along a first communications route; a second antenna unit configured to receive a signal along a second communications route; and a data processor configured to compare cyclic redundancy check (CRC) values with respect to packet streams of signals respectively received by the first and second antenna units, and change communications route to one of the first and second communications routes if packets having the same CRC value are detected. | 06-03-2010 |
20100135274 | HIERARCHICAL RANDOM ACCES METHOD FOR WIRELESS COMMUNICATION SYSTEM HAVING SIGNIFICANTLY LARGE CELL - Disclosed is a hierarchical random access method for a wireless communication system having a significantly large cell. According to the present invention, a length of a preamble sequence and a length of a reference slot may be designed based on a terminal having greatest capacity of adjusting a timing error arrived at a base station, and a slot length may be designed to be an integer multiple of the length of the reference slot depending on a timing error correction capacity, thereby enabling terminals to use various slot lengths. | 06-03-2010 |
20100135327 | APPARATUS AND METHOD FOR GENERATING FRAME FOR MPE-FEC DECODING - An apparatus and method for generating frames for MPE-FEC decoding are disclosed. The apparatus for generating frames for MPE-FEC decoding includes: a packet reception unit configured to receive a packet; a packet attribute inspection unit configured to inspect whether or not the received packet forms a header part of a section; and a frame generation unit configured to generate a frame according to different methods depending on whether or not the packet forms a header part of a section. | 06-03-2010 |
20100138713 | INTERACTION METHOD BETWEEN ARQ AND HARQ FOR SYSTEMS WITH LONG ROUNDTRIP DELAY - Disclosed is an interaction method between an automatic repeat request (ARQ) and a hybrid automatic repeat request (HARQ) in a system having a long roundtrip delay. A transmission window for the ARQ is operated using inner feedback information from the HARQ, and a waiting window is operated using ARQ status information. | 06-03-2010 |
20100138726 | MPE-FEC RS DECODER AND DECODING METHOD THEREOF - A decoding method of an MPE-FEC (MultiProtocol Encapsulation-Forward Error Correction) RS (Reed-Solomon) decoder, includes: substituting a value corresponding to an erasure error position with 0 in a reception signal; calculating a syndrome by using the reception signal; calculating an erasure position polynomial by using erasure information; calculating a modified syndrome by using the syndrome and the erasure position polynomial; calculating an erasure error size polynomial by using the modified syndrome; calculating an error position by using the erasure position polynomial; calculating an error size by using a modified Formey's algorithm; and correcting an error through the error position and the error size. | 06-03-2010 |
20100138878 | RECEIVER CIRCUIT OF SATELLITE DIGITAL VIDEO BROADCAST SYSTEM - A receiver circuit of a satellite digital video broadcast system includes: a multiplication unit outputting a synchronized reception symbol by multiplying a reception symbol by frequency error information as a feedback; a common autocorrelation unit acquiring autocorrelation values for each symbol by multiplying the synchronized reception symbol by an autocorrelation coefficient; a frame synchronization unit detecting a SOF (Start Of Frame), which is a synchronization word indicating start of a frame, from the autocorrelation values for each symbol; a frequency synchronization unit estimating the frequency error information based on the autocorrelation values for each reception symbol and the SOF; and an SNR estimation unit estimating an SNR (Signal to Noise Ratio) based on the autocorrelation values for each symbol and the SOF. | 06-03-2010 |
20100157880 | METHOD OF ESTABLISHING UPLINK IN MOBILE SATELLITE COMMUNICATION SYSTEM - Provided is a method of establishing an uplink in a mobile satellite communication system, the method including: receiving a random uplink access signal from terminals included in a coverage of a satellite beam; estimating a location of each of the terminals; calculating an uplink transmission point in time when each of the terminals transmits an uplink signal, based on the estimated location of each of the terminals; transmitting, to each of the terminals, the calculated uplink transmission point in time; and receiving the uplink signal from each of the terminals at the calculated uplink transmission point in time. | 06-24-2010 |
20100158091 | FREQUENCY ERROR ESTIMATOR AND FREQUENCY ERROR ESTIMATING METHOD THEREOF - Provided is a frequency error estimating method of a communication system. The method includes receiving a frame, and calculating a frequency error from a SOF field of the received frame. | 06-24-2010 |
20100158138 | SATELLITE BROADCASTING SYSTEM AND SIGNAL RECEIVING METHOD THEREOF - Provided is a satellite broadcasting terminals. The satellite broadcasting terminal includes: a first antenna receiving a radio signal of a first band or a second band; a second antenna receiving a radio signal of a third band; a first stream demodulating unit demodulating a first stream signal received through the first band; a second stream demodulating unit demodulating a second stream signal received through the second band; a playing unit playing the demodulated first or second stream signal; and a gap filler receiving unit selectively providing the first stream signal to the first stream demodulating unit in response to a radio signal intensity of the third band, the first stream signal being received through the third band. | 06-24-2010 |
20100182924 | METHOD OF CHANGING TRANSMISSION MODE, METHOD OF REQUESTING PACKET RETRANSMISSION, AND METHOD OF RETRANSMITTING PACKET - The present invention is directed to a method of changing a transmission mode, a method of requesting a packet retransmission, and a method of retransmitting a packet with respect to a broadcasting or multicast service. According to the invention, a plurality of terminals provided with one broadcasting or multicast service shares one random access channel (RACH) so as to transmit channel information. Accordingly, a base station receives the channel information through one RACH from the terminal or detects a packet collision generated in the RACH to confirm a request for changing the transmission mode or a request for maintaining the transmission mode by the terminal. | 07-22-2010 |
20100248714 | METHOD OF TRANSMITTING SIGNAL IN SATELLITE COMMUNICATION SYSTEM WITH TERRESTRIAL COMPONENT - The present invention relates to a method of transmitting a signal in a satellite communication system with a terrestrial component. The present invention transmits a signal using a method of transmitting a space-time code for joint communication between a satellite and a terrestrial component in a satellite system with a terrestrial component. Therefore, using the method of transmitting a space-time code, it is possible to obtain a space-time diversity gain in a satellite communication system with a terrestrial component. Further, it is possible to improve the receiving quality of a satellite signal at an area where the terrestrial component is located and increase the coverage of the terrestrial component. | 09-30-2010 |
20100251053 | SYSTEM AND METHOD FOR REUSING RADIO RESOURCES - The present invention relates to a system and method of reusing radio resources capable of improving radio resource efficiency. According to an embodiment of the present invention, in a communication system including a repeater that retransmits signals transmitted from a satellite to user terminals, it is possible to reuse some of the radio resources used in a wide area coverage, such as the satellite, in a repeater coverage. Therefore, it is possible to ensure radio resources such that repeater data can be transmitted to user terminals without additional radio resources. | 09-30-2010 |
20100259443 | ANTENNA SYSTEM FOR MOBILE VEHICLES - The present invention relates to an antenna system mounted on a mobile vehicle. In the present invention, a power distributor and a part of a high-frequency module that includes a frequency converter are placed in an external fixed unit that is placed outside a radome. In addition, an active cooler/cooling fin, a heater, and an air circulation fan are placed at an internal bottom plane of the antenna system, and a cooling fin and cooling fan are placed at an external bottom plane of the antenna system. | 10-14-2010 |
20100304668 | COMMUNICATION METHOD IN MOBILE COMMUNICATION SYSTEM - The present invention relates to a communication method in a mobile communication system. An exemplary embodiment of the present invention provides a mobile satellite communication system having a complementary terrestrial component among various mobile communication systems. The mobile satellite communication system can simultaneously provide a communication service and a broadcasting service to a terminal according to integration between communication and broadcasting. Different signal transmission methods are used between the complementary terrestrial component and a satellite. Specifically, a time division duplex method and a frequency division duplex method are used together and resources are allocated. As a result, system throughput can be increased, and local broadcasting contents can be effectively transmitted to the terminal. | 12-02-2010 |
20110006950 | MICROSTRIP ANTENNA COMPRISED OF TWO SLOTS - Disclosed relates to a microstrip antenna, particularly, relates to a dual band microstrip antenna including two slots. The microstrip antenna includes a conductor plate having a first hole and a substrate having a microstrip patch where slots of two different sizes are positioned, the substrate being located on a top of the conductor plate. | 01-13-2011 |
20110053628 | SERVICE PROVIDING SYSTEM AND METHOD IN SATELLITE COMMUNICATION SYSTEM - A service providing method in a satellite communication system includes: confirming positions of terminals when the terminals existing within a service area and intended to receive a service is connected to a satellite base station or a complementary terrestrial component; confirming first terminals, which communicate with the satellite base station, and second terminals, which communicate with the complementary terrestrial component, according to the positions of the terminals; allocating resources usable when communicating with the first terminals and resources usable when communicating with the second terminals; and providing a service to the terminals by using the allocated resources through multi-beams of the satellite base station and multi-beams of the complementary terrestrial component. | 03-03-2011 |
20110102264 | APPARATUS AND METHOD FOR DETECTING INTERIOR POSITION USING DIGITAL BROADCASTING SIGNAL - Provided is a receiving apparatus for detecting an interior position using digital broadcasting signals includes: a receiving unit receiving a digital broadcasting signal, which includes navigation information used for determining a position of the receiving apparatus, transmitted from a digital broadcasting signal transmitting apparatus; and an output unit outputting a signal to outside the receiving apparatus via wireless communication, wherein the receiving unit receives the digital broadcasting signals from a plurality of the digital broadcasting signal transmitting apparatuses. | 05-05-2011 |
20110113302 | TERMINAL TRANSMISSION APPARATUS FOR PROVIDING MULTIMEDIA SERVICE VIA SATELLITE COMMUNICATION LINK AND METHOD FOR PROVIDING MULTIMEDIA SERVICE USING THE SAME - The present invention separates inputted triple play IP data into Internet and TV data and voice (VoIP) data, encodes the Internet and TV data permitting a long delay time according to the existing DVB-S2 standard, and encodes the voice data permitting only a short delay time according to a DVB-RCS+M standard based 4K mode. Each encoded data is subjected to the orthogonal modulation and the orthogonally modulated voice data is subjected to a direct sequence spectrum spread according to a spreading factor. The spread spectrum signal is multiplexed in a SCPC frequency division multiple access (FDMA) scheme so as to overlap with frequencies allocated to each user. | 05-12-2011 |
20110142005 | METHOD AND SYSTEM FOR FAST LAYER 3 HAND-OVER - The present invention relates to a method of seamlessly providing a satellite multimedia Internet service to a fixed subscriber belonging to a lower user network even in a satellite shadow environment and shortening a hand-over processing time between heterogeneous networks by applying a fast layer 3 hand-over technology between satellite and wireless networks in a mobile satellite terminal device. | 06-16-2011 |
20110143695 | SENSING APPARATUS, NETWORK SYSTEM AND CONTROLLING METHOD ON THE BASIS OF SATELLITE - Disclosed is a sensing apparatus, a network system, and a controlling method on the basis of a satellite. A satellite-based sensing network system, comprising: a plurality of satellite transmitters that collect information on a peripheral environment and an operating state, and transmits it to peripheral satellites; a satellite wireless receiving/display device that directly receives and displays the information collected from the satellites; a ground control center that receives, stores, and analyzes the information collected from the satellites; and a management center that maintains and repairs the satellite transmitter based on the analyzed results. | 06-16-2011 |
20110149836 | POWER CONTROLLED ADAPTIVE MODULATION AND CODING SCHEME IN SATELLITE COMMUNICATIONS SYSTEM - A power controlled adaptive modulation and coding (AMC) scheme in a satellite communications system includes: calculating, by a user terminal, a received signal-to-noise ratio (SNR) through a packet received from a base station; removing a power control level applied to a packet received before the received packet from the calculated received SNR, and deciding the value obtained by decreasing the calculated received SNR by the power control level; deciding an AMC mode based on the decided received SNR; determining whether power control is required, and deciding a required power control magnitude depending on a channel state positioned in the AMC mode range; transmitting the decided AMC mode and the decided power control information to the base station through channel quality indicator (CQI) feedback; and applying the AMC mode based on information received, and increasing a power by a power control magnitude decided from the received information. | 06-23-2011 |
20110149837 | METHOD FOR MOBILE SATELLITE COMMUNICATION BY COORDINATED MULTI-POINT TRANSMISSION AND APPARATUS THEREOF - Provided is mobile satellite communication method and apparatus. The satellite communication method includes detecting a location of a terminal, determining a signal transmission scheme for the terminal using the terminal location, determining a subcarrier region to transmit a signal to the terminal using the location of the terminal, and communicating with the terminal using the determined signal transmission scheme and the determined subcarrier region. | 06-23-2011 |
20110149906 | METHOD FOR REDUCING PACKET ORDERING TIME OF LAYER 3 HANDOVER AND MOBILE SATELLITE TERMINAL USING THE SAME - There are provided a method for reducing a packet ordering time of layer 3 handover and a mobile satellite terminal using the same. The method for reducing a packet ordering time of layer 3 handover of a mobile router in a home agent of a satellite network connected with the mobile router includes: transmitting a first packet and a second packet to the mobile router through a satellite link of the mobile router; transmitting a sequence control packet to the mobile router through the satellite link; and transmitting a third packet to the mobile router via a wireless link of the mobile router. The sequence control packet provides a reference time for rapidly reordering the second and third packets which reach the mobile router in a reverse sequence. | 06-23-2011 |
20110151777 | DUAL MODE SATELLITE VERY SMALL APERTURE TERMINAL APPARATUS AND CONTROLLING METHOD THEREOF - Provided are a satellite VSAT apparatus and a control method thereof. The satellite VSAT apparatus according to an exemplary embodiment of the present invention can switch a modulation type of a signal to be transmitted from an indoor unit (IDU) to the outdoor unit to a linear or non-linear type in a case in which outputting of a transmitted signal is not controlled to an outdoor unit due to limitations, that is, there is no function such as an automatic signal level control in a block up-converter (BUC), a case in which transmission output limitation is large due to a lot of interference requirements for an adjacent channel, a case in which the number of adjacent channels (carriers) is large, or a case in which adjacent channel interference is large due to a frequency in a satellite multi-beam environment and polarization reuse, in a satellite VSAT apparatus system which aims at a low-priced user terminal. | 06-23-2011 |
20110154168 | EFFECTIVE HIGH-SPEED LDPC ENCODING METHOD AND APPARATUS USING THE SAME - Disclosed is an effective high-speed encoding method using a parity-check matrix proposed in an IEEE 802.1x standard for high-speed low-density parity-check encoding. In the prior art, encoding was performed by blocking and dividing the parity-check matrix of the LDPC code and through relevant matrix equations, or encoding was performed by an encoding apparatus that divides a matrix multiplication operation of a generated matrix acquired by using an arbitrary parity-check matrix of a quasi-cyclic (QC) LDPC code and information vectors into two sequential steps and implements each step as a cyclic shift-register. Unlike the prior art, the present invention provides an effective high-speed encoding method having low additional complexity by using a quasi-cyclic characteristic of a parity-check matrix as well as an encoding method through generation of a temporary parity bit, generation of a correction bit, and correction of a parity bit by using the parity-check matrix having a dual-diagonal parity structure proposed in the standard. | 06-23-2011 |
20110164565 | METHOD AND APPARATUS FOR ROUTING IN WIRELESS NETWORK - A method of routing a wireless network is provided. The method is performed by each of a group of nodes and includes: receiving a routing request signal; determining whether a node itself is a destination node, by referring to a traffic distribution table showing traffic throughput of the group of nodes and an intermediate-node weight table showing weights of intermediate nodes on all paths between the group of nodes and a source node, wherein a route path is selected by referring to the weights of intermediate nodes; and when it is determined that the node itself is the destination node transmitting a routing response signal to the source node that has transmitted the routing request signal, and receiving a packet from the source node, wherein the transmitting and receiving are performed by the determined destination node. By using the method, traffic in wireless network extreme communications can be distributed at intermediate nodes as well as at destination nodes. Therefore, all the networks can be effectively used in extreme circumstances. | 07-07-2011 |
20110202951 | MULTIMEDIA TERMINAL DEVICE AND OPERATING METHOD THEREOF, AND PERSONAL PORTABLE DEVICE FOR PROVIDING WIRED/WIRELESS RETRANSMISSION SERVICE - A personal portable terminal and an operating method of a multimedia terminal device are provided, and more particularly, a multimedia terminal device, an operating method of the multimedia terminal device, and a personal portable terminal are provided. The multimedia terminal device may receive bidirectional content and additional service information corresponding to the bidirectional content, may classify the received additional service information from the received bidirectional content, and may transmit the classified additional service information to a personal portable terminal that is registered in advance and that is connected wired or wirelessly to the multimedia terminal device. | 08-18-2011 |
20120033599 | SATELLITE MOBILE COMMUNICATION SYSTEMS CONSIDERING EVOLUTION OF SATELLITE MOBILE COMMUNICATION SERVICES MARKET AND METHOD FOR COMMUNICATION USING THE SYSTEM - Disclosed is a communication method of a satellite mobile communication system. The communication method of a satellite mobile communication system, includes: receiving system information indicating frame intervals in which first user equipments using a satellite radio interface in commonality with a terrestrial radio interface do not perform communications from a base station; accessing the base station in the rest frame intervals other than frame intervals in which the first user equipments do not perform communications, based on the system information; transmitting the system information from the base station to second user equipments using a satellite radio interface optimized for satellite environment; and accessing the base station in the rest frame intervals based on the system information received in the second user equipments. | 02-09-2012 |