METHOD AND APPARATUS FOR RECEIVING DATA

• US 20120134446A1
• Filed: 07/20/2010
• Published: 05/31/2012
• Est. Priority Date: 08/07/2009
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Zhou, Wei, Zou, Li, Zhao, Yuping, Zhang, Xiaoxin, Liu, Peng, Wang, Charles Chuanming
• Granted Patent: US 8,660,203 B2
• Time in Patent Office: Days
• US Class Current: 375/320
• CPC Class Codes: H03M 13/655 UWB OFDM
• CPC Class Codes: H03M 13/6552 DVB-T2
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/3405 Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04L 27/38 Demodulator circuits; Receiver circuits

Abstract

Modem coding and modulation techniques have greatly improved the transmission and reception of signals. A method is described including receiving a signal de-mapping the signal into a first and second substream, decoding the first and second substream using a low density parity check decoding process, and combining the first and second decoded substream into a single data stream. An apparatus is described including a symbol de-mapper that receives a signal de-maps the modulation symbols in the signal into a first and second substream, a first decoder that decodes the first substream using a low density parity check coding process at a first decoding rate, a second decoder that decodes the second substream at a second encoding rate, and a combiner that combines the first substream and the second substream into a single data stream.

Claims

1. A method for receiving signals, comprising the steps of:

receiving a signal containing modulation symbols;

de-mapping the modulation symbols into a first set of bits from a first region of a symbol constellation map to produce a first substream and a second set of bits from a second region of the symbol constellation map to produce a second substream;

decoding the first substream and the second substream using a low density parity check decoding process; and

combining the first decoded substream and the second decoded substream into a single data stream.

2. The method of claim 1, further comprising the step of grouping bits in the first substream and the second substream into sets of code symbols.

3. The method of claim 2, wherein the step of decoding includes decoding using a non-binary low density parity check coding process.

4. The method of claim 1, wherein the step of decoding includes decoding the first substream at a decoding rate that is greater than the decoding rate for the second substream.

5. The method of claim 1, wherein the step of de-mapping the set of bits from the first encoded substream and the set of bits from the second encoded substream is based on an encoding rate of the first substream and an encoding rate of the second substream.

6. The method of claim 1, wherein the bits mapped from the first region have a higher reliability of data recovery and the bits mapped from the second region have a lower reliability of data recovery.

7. The method of claim 1, further comprising the step of block de-interleaving the first substream and the second substream.

8. The method of claim 1, wherein the step of de-mapping includes de-mapping the modulation symbols into bits using at least one of a 16 QAM, 32, QAM, 64 QAM, 256 QAM constellation map.

9. (canceled)

10. An apparatus for receiving signals comprising:

a symbol de-mapper that receives a signal containing modulation symbols and de-maps the modulation symbols into a first substream containing a first set of bits and a second substream containing a second set of bits;

a first decoder, coupled to the de-mapper, that decodes the first substream using a low density parity check coding process at a first decoding rate;

a second decoder, coupled to the de-mapper, that decodes the second substream using a low density parity check coding process at a second encoding rate; and

a combiner, coupled to the first decoder and the second decoder, that combines the first decoded substream and the second decoded substream into a single data stream.

11. The apparatus of claim 10, further comprising:

a first de-interleaver, coupled to the symbol de-mapper and the first decoder, that de-interleaves the first substream using a block interleaving process; and

a second de-interleaver, coupled to the de-mapper and the second decoder, that de-interleaves the second substream using a block interleaving process.

12. The apparatus of claim 11, wherein the first de-interleaver groups bits in the first substream into a first set of code symbols and wherein the second de-interleaver groups bits in the second substream into a second set of code symbols.

13. The apparatus of claim 12 wherein the first decoder decodes the first set of code symbols using a first non-binary low density parity check decoding process and wherein the second decoder decodes the second set of code symbols using a second non-binary low density parity check coding process.

14. The apparatus of claim 10, wherein the symbol de-mappper de-maps the first set of bits from a region of a symbol constellation map having a higher reliability of data recovery and de-maps the second set of bits from a region of the symbol constellation map having a lower reliability of data recovery.

15. The apparatus of claim 10, wherein symbol de-mapper de-maps the modulation symbols into bits in the first substream and bits in the second substream based on an encoding rate of the first substream and an encoding rate of the second substream.