| Patent application number | Description | Published |
|---|
| 20080285591 | Apparatus and Method for Deciding Transmission Format Using Variable Frame Length and Decoding Method Using the Same - Provided are an apparatus and method for deciding a transmission format using a variable frame length and a decoding method using the same. The apparatus for deciding the transmission format using the variable frame length includes: a frame synchronization acquiring unit for acquiring a frame synchronization of a received transmission frame; a correlation analyzing unit for performing a correlation analysis with respect to the transmission frame whose synchronization is acquired, considering frame lengths of respective frame structures; and a transmission frame structure deciding unit for deciding the structure of the received transmission frame using the analyzed correlation. Accordingly, a physical layer signaling code (PLSC) demodulation and decoding performance can be enhanced by determining the structure of the transmitted frame without carrying out a PLSC decoding in such a state that a frequency synchronization is not acquired. | 11-20-2008 |
| 20080285685 | Apparatus and Method for Generating Soft Bit Metric and M-Ary Qam Receiving System Using the Same - Provided are an apparatus and method for generating a soft bit metric and a multi-level (M-ary) Quadrature Amplitude Modulation (QAM) receiving system using the same. The apparatus includes an analog to digital converter for converting an analog symbol signal of a demodulated I (Inphase) or Q (Quadrature) channel into a digital signal, a sealer for scaling the converted digital signal based on a reference value used for determining a space between symbols, a positive integer converter for calculating a positive integer of the scaled digital I or Q channel symbol signal, a sign determinator for determining a sign of the scaled digital I or Q channel symbol signal, and a bit information converter for converting the scaled digital I or Q channel symbol signal into soft bit metric information per bit on the basis of the calculated positive integer and the determined sign value. | 11-20-2008 |
| 20090154421 | METHOD FOR HANDOVER BETWEEN HETEROGENEOUS NETWORKS USING LINK TRIGGER SIGNAL IN MULTI-INTERFACE MOBILE ROUTER - Provided is a method for handover between heterogeneous networks using a link trigger signal in a multi-interface mobile router. The method includes: maintaining a state of a second network access interface in a sleep state, activating a first network access interface, receiving and transmitting the first network service to a subordinate node in the mobile router located in a first network; when the mobile router senses a second network link-up trigger signal while moving to the second network, changing the state of the second network access interface into an active state and performing handover; and receiving a second network service through the activated second network access interface in the mobile router performing the handover and transmitting the second network service to the subordinate node. | 06-18-2009 |
| 20090154609 | APPARATUS AND METHOD FOR SELECTING CORRELATION SCHEME BASED ON CARRIER FREQUENCY ERROR - Provided is a correlation scheme selecting apparatus and method that can acquire initial synchronization efficiently by calculating frequency error criterion threshold between correlation schemes and selecting a correlation scheme for each region when a correlation value is calculated for initial sync in a communication system with carrier frequency errors. The method for selecting a correlation scheme based on a carrier frequency error includes: calculating mis-detection probability values based on a normalized frequency offset for each correlation scheme; determining as a frequency-error criterion threshold a crossing point of graphs of the calculated mis-detection probability values for each correlation scheme; and selecting a correlation scheme based on the determined frequency-error criterion threshold. | 06-18-2009 |
| 20100007743 | FRAME SYNCHRONIZATION AND STRUCTURE DETECTION METHOD IN DVB-S2 SYSTEM - Provided is a method for detecting frame sync and frame structure in a satellite broadcasting system. The method for detecting frame sync and frame structure includes the steps of: calculating differential correlation values of reception symbols; generating index sequences of reception symbols whose differential correlation values calculated above exceed a threshold value; calculating positions estimated as frame start points which correspond to a total frame number based on the number of symbols per frame for each frame structure; and detecting frame sync and frame structure based on the umber of positions where the above-calculated frame start point estimated positions and the above-generated index sequences are matched. | 01-14-2010 |
| 20100091913 | APPARATUS AND METHOD FOR ESTIMATING PHASE ERROR BASED ON VARIABLE STEP SIZE - Disclosed is a phase error estimating an apparatus and a method which provides improved convergence speed and tracking speed even in mobile channel environment by variably applying the step size for phase error estimation according to channel status. The apparatus for estimating a phase error includes: a posterior probability (APP) average calculating unit for calculating an APP average value from a soft decision result of a currently received symbol; a step size determining unit for determining a step size variably according to channel status; and a phase error estimating unit for estimating a phase error of the currently received symbol from a phase error of a previously received symbol and the APP average value by using the variably determined step size. | 04-15-2010 |
| 20100262888 | DECODING APPARATUS AND METHOD BASED ON VARIABLE ERROR CORRECTION VALUE - Provided is a decoding apparatus and method based on a variable error correction value. The decoding method includes setting an initial normalized factor and a normalized factor correction value, initially updating a check node based on the initial normalized factor, and updating the check node based on a variable error correction value acquired by adding the initial normalized factor and the normalized factor correction value. | 10-14-2010 |
| 20100271967 | METHOD AND APPARATUS FOR MEASURING DEMODULATING PERFORMANCE OF COMMUNICATION SYSTEM - Provided is a method and apparatus for measuring demodulating performance of a communication system. The method includes: commanding the mobile station to modulate test pattern data and transmit test pattern data to the central station; commanding the central station to comparing a demodulation result of the data transmitted from the mobile station with the test pattern data; and receiving the comparison result from the central station. | 10-28-2010 |
| 20100272190 | SCALABLE TRANSMITTING/RECEIVING APPARATUS AND METHOD FOR IMPROVING AVAILABILITY OF BROADCASTING SERVICE - Provided is a scalable transmitting/receiving apparatus and method for improving availability of a broadcasting service, which can allow a reception party to select an optimum video according to an attenuation degree of a broadcasting signal by scalably encoding video data and transmitting it by a different transmission scheme for each layer. The scalable transmitting apparatus for improving availability of a broadcasting service includes: a scalable video encoder for scalably encoding video data to generate scalable video elementary streams having logical layers; a multiplexer for multiplexing the multiple scalable video elementary stream, a compressed audio elementary stream, and program specification information to generate a transport stream; and a scalable transmitter for separating the transport stream into multiple TS packet streams according to pre-given priority information, and transmitting the packet streams by a different transmission scheme for each layer. down-sampler | 10-28-2010 |
| 20100278192 | CHANNEL DATA MULTIPLEXING APPARATUS AND METHOD FOR SUPPORTING VARIABLE TRANSMISSION RATE - Provided is a channel data multiplexing apparatus and method for supporting a variable transmission rate. The channel data multiplexing apparatus includes an input memory for receiving multi-channel baseband data in parallel and storing the baseband data at a first clock rate; an output memory for reading the baseband data stored in the input memory at a second clock rate and storing the baseband data; a multiplexing unit for reading the baseband data stored in the output memory in channel sequence at a third clock rate and outputting the baseband data in serial; and a control unit for controlling address processing and clock rates for data read/write (storage) from/in the input and the output memories and the multiplexing unit depending on a transmission mode. | 11-04-2010 |
| 20100316161 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA USING SATELLITE CHANNEL - A method for transmitting data using a satellite channel includes: channel-encoding bit data using an e-BCH code; interleaving the encoded data; modulating the interleaved data according to a CPM scheme using four symbols; and transmitting the modulated data to a hub station. | 12-16-2010 |
