Abstract:
PURPOSE: A transmission path selection apparatus and method thereof are provided to guarantee stable performance of a relay network by selecting a data transmission path. CONSTITUTION: A transmission path selection unit(312) selects the best indirect transmission path quality in a transmission path quality measurement unit. The transmission path selection unit compares the selected indirect transmission path quality with the measured direct transmission path quality. The transmission path selection unit selects the direct transmission path and the indirect transmission path according to the comparison result. A transmission unit(316) transmits data to a destination node using a transmission path selected by the transmission path selection unit. [Reference numerals] (310) Transmission path quality measurement unit; (312) Transmission path selection unit; (314) Data creation unit; (316) Transmission unit
Abstract:
PURPOSE: A method for encoding and decoding a broadcast signal for parallel process error correction, a device for sending and receiving the same and system thereof are provided to shorten the time of encoding and decoding an error correction code method due to a parallel process. CONSTITUTION: A data encoder(110) outputs encoded broadcasting data in a TS(Transport Stream) unit. A multiplexer(120) performs multiplexing of an inputted TS if a preset numbers. According to an error-correction code mode, an error correction coder(130) performs encoding of an inputted packet of a preset number. An CRC(Cyclic Redundancy Check) processor(140) includes a CRC code which is generated according to a CRC calculation in a code block.
Abstract:
PURPOSE: A broadcasting signal decoding method, broadcasting transmitting/receiving apparatus for the same, and system thereof are provided to encode an error correction code mode through parity which is used for channel conversion of a system. CONSTITUTION: An error correction decoder determines whether channel converting timing is lower start synchronization(S805). In case the channel converting point is lower start synchronization, the error correction decoder receives an encoding block until next start synchronization appears from a lower start synchronization point(S811). The error correction decoder decodes an error correction code in an encoding block unit(S813).
Abstract:
복수의 통신노드를 포함하는 네트워크에서, 두 통신노드 사이에 직접 통신이 가능한 직접 경로가 존재하지 않는 경우, 복수회의 단일 릴레이 방식의 통신을 반복 수행함으로써 통신의 에러율 증가를 억제할 수 있는 통신 방법이 개시된다. 상기 통신 방법은, 송신하고자 하는 데이터를 갖는 통신노드를 소스노드로 하고, 그 주변의 일 통신노드를 릴레이노드로 하고 상기 릴레이노드와 일정 수준 이하의 에러율을 갖는 일 통신노드를 목적노드로 하여 단일 릴레이 방식의 통신을 수행하고, 데이터를 전송받고자 하였던 통신노드가 목적노드가 될 때까지 목적노드를 다시 소스노드로 하는 단일 릴레이 방식의 통신을 반복적으로 수행한다. 통신노드, 소스노드, 릴레이노드, 목적노드, 단일 릴레이 방식,
Abstract:
An apparatus and a method for decoding using MIN-SUM iterative decoding algorithm for improving performance of an LDPC(Low Density Parity check) code is provided to obtain the result approximate to the performance of SUM-PRODUCT algorithm by differently changing a scaling factor multiplied for every iterative decoding for reducing performance deterioration. A variable node updating unit(11) receives a symbol when the repetition number is 0 and updates the LLR of the variable node by receiving Lc in a repetition process. A repetition comparison unit(12) receives the result of the variable node updating unit and determines whether the result is above the determined number or not. A scaling factor multiplier(13) receives the determination result of the repetition comparison unit and multiplies the scaling factor. A check node updating unit(14) updates the Lv multiplied by the scaling factor in the scaling factor multiplier. A vector optimization unit(15) receives the update result of the check node updating unit and obtains the scaling factor. A density evolution unit performs the density evolution for the scaling factor obtained in the vector optimization unit and obtains the threshold value. A comparison unit(17) receives the result of the density evolution unit and compares the previously threshold level with the threshold level at the current repetition. The decision unit(18) receives the result of the repetition comparison unit and determines the output.