摘要:
A transmission apparatus and method, respectively, mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system. To enable selection of robustness for transmission of data, the apparatus includes a frame forming mechanism mapping data blocks of at least two mapping input data streams onto frames of the mapping output data stream covering the channel bandwidth, each frame including a payload portion, the payload portion including plural data symbols and being segmented into data segments each covering a bandwidth portion of the channel bandwidth. The frame forming mechanism is configured to map the data blocks of the at least two mapping input data streams onto data symbols of the payload portion and includes a MIMO mode selector selecting a MIMO mode of the data blocks per data segment and/or per mapping input data stream.
摘要:
The present invention relates to an apparatus and a corresponding method demapping a demapping input data stream (Q′) having a channel bandwidth received in a multi-carrier broadcast system into a demapping output data stream (Sy′). The demapping input data stream (Q′) comprises, alternately arranged, one or more first and one or more second frames (F1, F2) having different frame structures. In an embodiment a stream demapping means (132) is provided for demapping said second frames from said demapping input data stream (Q′), and a frame demapping means (134) is provided for demapping said second frames (F2) comprising a preamble portion (40) and a payload portion (50) into said demapping output data stream (Sy′), wherein said frame demapping means (134) is adapted for demapping the signalling data (Si) from the preamble portion (40), which comprises at least one preamble symbol (41) carrying at least one preamble signalling block including signalling data, and for demapping the data blocks of said demapping output data stream (Sy′) from the payload portion (50) by use of said signalling information (Si), wherein payload data are mapped onto the payload portion (50) comprising a plurality of data symbols (52) carrying payload data of at least two mapping input data streams (S1, S2, . . . , Sp), said payload portion (50) being segmented into data segments (51) each covering a bandwidth portion of said channel bandwidth.
摘要:
The present invention relates to an apparatus and a corresponding method for mapping error correction code encoded time-domain data of at least two mapping input data streams (S1, S2, . . . , Sn) onto a time-domain mapping output data stream (Q) having a frame structure, comprising a data input (102) for receiving said at least two mapping input data streams (S1, S2, . . . , Sn) each being segmented into data blocks (D1, D2, . . . , DN) carrying error correction code encoded data, a data mapper (104) for mapping the data blocks (D1, D2, . . . , DN) of said at least two mapping input data streams (S1, S2, . . . , Sn) onto frames of said mapping output data stream (Q), each frame comprising a number of frame intervals (F1, F2, . . . , FM), wherein the data mapper (104) is adapted for mapping the data blocks (D1, D2, . . . , DN) onto said frame intervals such that each frame interval (F1, F2, . . . , FM) carries sequentially arranged data blocks (D1, D2, . . . , DN) from various mapping input data streams (S1, S2, . . . , Sn) and that within a frame the mapping of data blocks (D1, D2, . . . , DN) from the various mapping input data streams (S1, S2, . . . , Sn) onto frame intervals (F1, F2, . . . , FM) is different from frame interval to frame interval, and a data output (110) for outputting said mapping output data stream (Q).
摘要:
A transmitter for broadcasting data in a broadcasting system that improves the decoding quality, if needed, comprises a data input, and an encoder for error correction code encoding the input data words into codewords, a codeword comprising a basic codeword portion and an auxiliary codeword portion, wherein said encoder is adapted for generating said basic codeword portion from an input data word according to a first code and for generating said auxiliary codeword portion from an input data word according to a second code, said basic codeword portion being provided for regular decoding and said auxiliary codeword portion being provided as incremental redundancy if regular decoding of the codeword by use of the basic codeword portion is erroneous. Further, the transmitter comprises a data mapper for mapping the codewords onto frames of a transmitter output data stream, and a transmitter unit for transmitting said transmitter output data stream.
摘要:
An encoder for error correction code encoding input data words (D) into codewords (Z1, Z2) includes an encoder input for receiving input data words each including a first number Kldpc of information symbols, an encoding unit for encoding an input data word (D) into a codeword (Z1, Z2, Z3, Z4) such that a codeword includes a basic codeword portion (B) including a data portion (D) and a basic parity portion (Pb) of a second number N ldpc - Kldpc of basic parity symbols, and an auxiliary codeword portion (A) including an auxiliary parity portion (Pa) of a third number MIR of auxiliary parity symbols, and an encoder output for outputting the codewords (Z1, Z2).
摘要:
OFDM generation apparatus and methods generating OFDM transmission signals from OFDM symbols, each including a plural OFDM subcarriers, for transmission in a multi-carrier data transmission system. In OFDM systems using the concept of Absolute OFDM and/or using Segmented OFDM common phase rotations of the OFDM subcarriers of the OFDM symbol with respect to adjacent OFDM symbols of the OFDM transmission signal generally appear. To avoid or compensate those common phase rotations, in the apparatus and method a selected mixing frequency is used for mixing the complex time-domain samples of the OFDM symbol from a baseband frequency up to a passband frequency by use of a mixing frequency to obtain the OFDM transmission signal, wherein the mixing frequency is selected such that common phase rotations of the OFDM subcarriers of the OFDM symbol with respect to adjacent OFDM symbols of the OFDM transmission signal are avoided or compensated after the mixing.
摘要:
An apparatus and a corresponding method for mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system includes first and second frame forming mechanisms. The first frame forming mechanism is adapted to form first frames having a first frame structure and the second frame forming mechanism is adapted to form second frames having a second frame structure. Preferably, in a second frame structure the data blocks of a particular mapping input data stream are spread in time and frequency over various data symbols and various data segments of the second frames to provide high robustness against disturbances. The payload portion of the second frame is preferably segmented into various data segments enabling use of a narrow-band receiver, even if both the first and second frames cover the same total channel bandwidth.
摘要:
The present invention relates to an apparatus and a corresponding method for mapping error correction code encoded time-domain data of at least two mapping input data streams (S1, S2, . . . , Sn) onto a time-domain mapping output data stream (Q) having a frame structure, comprising a data input (102) for receiving said at least two mapping input data streams (S1, S2, . . . , Sn) each being segmented into data blocks (D1, D2, . . . , DN) carrying error correction code encoded data, a data mapper (104) for mapping the data blocks (D1, D2, . . . , DN) of said at least two mapping input data streams (S1, S2, . . . , Sn) onto frames of said mapping output data stream (Q), each frame comprising a number of frame intervals (F1, F2, . . . , FM), wherein the data mapper (104) is adapted for mapping the data blocks (D1, D2, . . . , DN) onto said frame intervals such that each frame interval (F1, F2, . . . , FM) carries sequentially arranged data blocks (D1, D2, . . . , DN) from various mapping input data streams (S1, S2, . . . , Sn) and that within a frame the mapping of data blocks (D1, D2, . . . , DN) from the various mapping input data streams (S1, S2, . . . , Sn) onto frame intervals (F1, F2, . . . , FM) is different from frame interval to frame interval, and a data output (110) for outputting said mapping output data stream (Q).
摘要:
An apparatus and method demapping a demapping input data stream having a channel bandwidth received in a multi-carrier broadcast system into a demapping output data stream. A stream demapping mechanism demaps second frames from the demapping input data stream, and a frame demapping mechanism demaps the second frames including a preamble portion and a payload portion into the demapping output data stream. The frame demapping mechanism demaps signalling data from the preamble portion, which includes at least one preamble symbol carrying at least one preamble signalling block including signalling data, and demaps data blocks of the demapping output data stream from the payload portion by using signalling information. Payload data are mapped onto the payload portion including plural data symbols carrying payload data of at least two mapping input data streams, the payload portion being segmented into data segments each covering a bandwidth portion of the channel bandwidth.
摘要:
A receiver includes: a broadcast receiver receiving a receiver input data stream segmented into frames, wherein basic codeword portions of codewords are mapped onto the frames, a codeword including at least a basic codeword portion generated from an input data word according to a first code; a data demapper demapping the basic codeword portions; a decoder error correction code decoding the codewords into output data words of at least one output data stream in a regular decoding using the basic codeword portion in a codeword; a check unit checking if the regular decoding of a codeword is erroneous; a unicast request unit requesting, if the regular decoding of a codeword is erroneous, an auxiliary codeword portion of the erroneously decoded codeword for incremental redundancy in an additional decoding; a unicast receiver unit receiving an auxiliary codeword portion of the erroneously decoded codeword.