摘要:
An apparatus for transmitting data in a communication system using a Low Density Parity Check (LDPC) matrix is provided. The apparatus includes an interleaver for interleaving a descending bit-ordered codeword having a predetermined size and in accordance with a predetermined modulation scheme; and a bit mapper for mapping codeword bits constituting the interleaved codeword in accordance with a predetermined mapping scheme that takes into account degrees of the codeword bits and reliability characteristics of modulation symbol-constituting bits based on the predetermined modulation scheme.
摘要:
Disclosed is a method for transmitting a packet in a multimedia system, the method comprising the steps of: configuring a payload on the basis of a data unit, wherein the data unit is divided from at least one media processing unit for constituting media data; generating a packet including the payload and a payload header; and transmitting the packet to a receiving end, wherein if the payload is configured on the basis of a plurality of fragments in which the data unit is divided, the payload header includes division information related to the fragments included in the payload, and the division information related to the fragments included in the payload comprises: a fragment indicator indicating whether data included in the payload is a first fragment or is a last fragment among the plurality of fragments, or whether the data is the remainder of fragments excluding the first fragment and the last fragment among the plurality of fragments; and a value of a fragment counter indicating the number of packets having a payload including each fragment following the fragments included in the payload of the packet among the plurality of fragments.
摘要:
An apparatus and method are provided for transmitting and receiving a quasi-cyclic Low Density Parity Check (LDPC) code in a multimedia communication system. In the method, a signal transmission apparatus generates a quasi-cyclic LDPC code, and transmits the quasi-cyclic LDPC code to a signal reception apparatus. The quasi-cyclic LDPC code is generated by encoding an information word vector using a child parity check matrix, generated by performing one of a scaling operation, a row separation operation, and a row merge operation on a parent parity check matrix. In the scaling operation, a size of the child parity check matrix is determined. In the row separation operation, each of rows included in the parent parity check matrix is separated. In the row merge operation, the rows included in the parent parity check matrix are merged.
摘要:
A method of operating a transmitting apparatus in a multimedia system is provided. The method includes transmitting a data unit of a multimedia service including event information related to an event,wherein the event includes notification to an application, the notification indicating that an action is to be taken.
摘要:
A method and an apparatus for transmitting and receiving a packet in a broadcasting and communication system are provided. The method and apparatus allows a receiver to recognize data in a packet lost due to data loss occurring in a network. To this end, Forward Error Correction (FEC) control-related information is generated, a packet including the generated FEC control-related information is generated, and the packet is transmitted. The FEC control-related information includes at least one of FEC configuration-related information and FEC encoding configuration-related information.
摘要:
A method for transmitting a packet in a communication system is provided. The method includes dividing a data stream into data payloads of a predetermined size and adding a common header to each of the data payloads, to generate a source payload, adding a first Forward Error Correction (FEC) payload Identifier (ID) to the source payload and applying an FEC code thereto, to generate an FEC source packet for a source payload, adding a second FEC payload ID to at least one parity payload and applying an FEC code thereto, to generate an FEC parity packet for the at least one parity payload, and transmitting the FEC source packet and the FEC parity packet.