Transmitter and receiver for broadcasting data and providing incremental redundancy

1. A receiver for receiving data, comprising:

circuitry configured to:

receive a receiver input data stream segmented into frames;

demap codewords mapped onto the frames of the receiver input data stream, a codeword comprising a basic codeword portion and an auxiliary codeword portion, wherein said basic codeword portion is generated from an input data word according to a first code and said auxiliary codeword portion is generated from an input data word according to a second code;

buffer the auxiliary codeword portion and demap the auxiliary codeword portion of the codeword before the basic codeword portion is demapped from the frames of a receiver input data stream;

error correction code decode said codewords into output data words of at least one output data stream in a regular decoding based on the basic codeword portion comprised in a codeword and, if said regular decoding of a codeword is erroneous, further decode by additionally utilizing the auxiliary codeword portion as incremental redundancy;

check if the regular decoding of a codeword is erroneous; and

output said at least one receiver output data stream segmented into said decoded output data words.

2. The receiver as claimed in claim 1 , wherein the circuitry is further configured to demap the basic codeword portion of a codeword from a different portion of the receiver input data stream, or from a different frame, than the auxiliary codeword portion of the same codeword.

3. The receiver as claimed in claim 1 , wherein the circuitry is further configured to:

demap the basic codeword portion of a codeword from a frame of a first type of the receiver input data stream, or from a T2 frame of a receiver input data stream in accordance with a DVB broadcasting system, and demap the auxiliary codeword portion of the respective codeword from a frame of a second type, arranged between frames of the first type, of the receiver input data stream, or from an FEF frame of the receiver input data stream in accordance with the DVB broadcasting system.

4. The receiver as claimed in claim 1 , wherein the circuitry is further configured to:

decode, according to said first code, the input data word from a basic codeword including said basic codeword portion and decode, according to said second code, the input data word from an auxiliary codeword including said basic codeword portion and said auxiliary codeword portion, and

demap the basic codeword from a different portion of the receiver input data stream, or from a different frame, than the auxiliary codeword portion of said auxiliary codeword.

5. The receiver as claimed in claim 1 , wherein circuitry is further configured to:

decode, according to said second code, the input data word from a codeword including said basic codeword portion and said auxiliary codeword portion, and

demap the basic codeword portion of said codeword from a different portion of the receiver input data stream, or from a different frame, than the auxiliary codeword portion of said codeword.

6. The receiver as claimed in claim 1 , wherein the circuitry is further configured to:

decode the input data words from codewords which comprise a basic codeword portion and an auxiliary codeword portion, said auxiliary codeword portion including at least two auxiliary codeword sub-portions, and

utilize said basic codeword portion for said regular decoding and said at least two auxiliary codeword sub-portions as incremental redundancies if regular decoding of the codeword based on the basic codeword portion is erroneous.

7. The receiver as claimed in claim 6 , wherein the circuitry is further configured to demap the at least two auxiliary codeword sub-portions of a codeword from said receiver input data stream such that the auxiliary codeword sub-portion used as a first incremental redundancy is demapped after demapping of the respective data portion of said codeword but before demapping of further auxiliary codeword sub-portions.

8. The receiver as claimed in claim 1 , further comprising a feedback loop to signal if a previous decoding of a codeword has been erroneous and initiate another decoding attempt based on additional parts of or the complete auxiliary codeword portion, if available.

9. The receiver as claimed in claim 1 ,

wherein the circuitry further include a first antenna to receive a first receiver input data stream and a second antenna to receive a second receiver input data stream, and

wherein the circuitry is further configured to demap the basic codeword portions of the codewords from said first receiver input data stream and demap the auxiliary codeword portions of the codewords from said second receiver input data stream.

10. The receiver as claimed in claim 1 , wherein the circuitry is further configured to demodulate the auxiliary codeword portions based on an auxiliary modulation code that is orthogonal to a basic modulation code utilized for demodulating the basic codeword portions.

11. The receiver as claimed in claim 1 , wherein the circuitry is further configured to demodulate the basic codeword portion of a codeword differently than the auxiliary codeword portion of a same codeword before or after demapping the codewords onto the frames from the receiver input data stream.

12. The receiver as claimed n claim 1 , wherein the circuitry is further configured to apply a systematic code to decode said codewords such that said basic codeword portion comprises a data portion, or the input data word, and a basic parity portion, and said auxiliary codeword portions comprises an auxiliary parity portion.

13. A receiving method for receiving data, comprising:

receiving, in a buffer, a receiver input data stream segmented into frames;

demapping codewords mapped onto the frames of the receiver input data stream, a codeword comprising a basic codeword portion and an auxiliary codeword portion, wherein said basic codeword portion is generated from an input data word according to a first code and said auxiliary codeword portion is generated from an input data word according to a second code;

demapping the auxiliary codeword portion of the codeword before a corresponding basic codeword portion is demapped from the frames of a receiver input data stream;

error correction code decoding said codewords into output data words of at least one output data stream in a regular decoding based on the basic codeword portion comprised in a codeword and, if said regular decoding of a codeword is erroneous, further decode based on the auxiliary codeword portion as incremental redundancy;

checking if the regular decoding of a codeword is erroneous; and

outputting said at least one receiver output data stream segmented into said decoded output data words.