Device and method for encoding bits to symbols for a communication system
A device and method for encoding bits to symbols for a communication system are described. In one embodiment, a method for encoding bits to symbols for a communication system includes receiving a set of N-bit data to be transmitted, where N is an integer, generating side scrambling values using a polynomial, scrambling the set of N-bit data using the side scrambling values to produce scrambled data, mapping the scrambled data to a particular set of M symbols from a plurality of sets of M symbols, where M is an integer and M is smaller than N, and outputting the particular set of M symbols for transmission over a transmission medium. Other embodiments are also described.
1. A method for encoding bits to symbols for a communication system, the method comprising:
concatenating an error correction bit to the most significant bit of a set of data to generate a set of N-bit data to be transmitted, where N is an integer;
generating side scrambling values using a polynomial;
scrambling the set of N-bit data using the side scrambling values to produce scrambled data;
mapping the scrambled data to generate a particular set of M symbols from a plurality of sets of M symbols, where M is an integer and M is smaller than N; and
outputting the particular set of M symbols for transmission over a transmission medium.
2. The method of claim 1 , wherein said N is eight.
3. The method of claim 1 , wherein said M is six, and wherein the mapping includes mapping the scrambled data to a particular set of six symbols from a plurality of sets of six symbols.
4. The method of claim 1 , wherein said generating includes generating the side scrambling values using a polynomial of
g m (x)=1+x 13 +x 33 or g s (x)=l+x 20 +x 33 , where g m (x) is a master scrambler and gs(x) is a slave scrambler polynomial.
5. The method of claim 1 , further comprising shuffling the polarity of the particular set of M symbols using states of the side scrambling values.
6. The method of claim 1 , further comprising multiplexing the M symbols to a single output line so that the M symbols can be serially transmitted over the transmission medium.
7. The method of claim 5 , wherein the transmission medium includes an unshielded twisted pair (UTP) cable.
8. The method of claim 1 , further comprising receiving the set of N-bit data on four parallel signal lines from a media independence interface (MII) before the concatenating of the error correction bit to the set of data.
9. A device comprising:
a bit conversion module configured to concatenate an error correction bit to the most significant bit of a set of data to generate a set of N-bit data to be transmitted, where N is an integer;
a side scrambler module configured to generate side scrambling values using a polynomial;
a data scrambler module configured to scramble the set of N-bit data to be transmitted using the side scrambling values from the side scrambler module to produce scrambled data; and
a symbol generation module configured to map the scrambled data to a particular set of M symbols from a plurality of sets of M symbols, where M is an integer and M is smaller than N,
the particular set of M symbols being symbols to be transmitted over a transmission medium.
10. The device of claim 9 , wherein said N is eight, and wherein the data scrambler module is configured to scramble a set of eight-bit data to be transmitted.
11. The device of claim 9 , wherein said M is six, and wherein the symbol generation module is configured to map the scrambled data to a particular set of six symbols from a plurality of sets of six symbols.
12. The device of claim 9 , wherein the side scrambler module is configured to generate the side scrambling values using a polynomial of g m (x)=1+x 13 +x 33 or g s (x)=l+x 20 +x 33 , where g m (x) is a master scrambler and gs(x) is a slave scrambler polynomial.
13. The device of claim 9 , further comprising a symbol shuffling module configured to output values using states of the side scrambling values for symbol polarity shuffling.
14. The device of claim 9 , further comprising a multiplexer configured to multiplex the M symbols to a single output line so that the M symbols can be serially transmitted over the transmission medium.
15. The device of claim 9 , wherein the transmission medium includes an unshielded twisted pair (UTP) cable.
16. A method for encoding bits to symbols for a communication system, the method comprising:
concatenating an error correction bit to the most significant bit of a byte of data to be transmitted to produce a nine-bit data;
generating nine scrambling values using a polynomial;
scrambling the nine-bit data using the nine side scrambling values to produce a nine-bit scrambled data;
mapping the nine-bit scrambled data to generate a particular set of six symbols from a plurality of sets of six symbols; and
outputting the particular set of six symbols for transmission over a transmission medium.
17. The method of claim 16 , further comprising multiplexing the particular set of six symbols to a single output line so that the particular set of six symbols can be serially transmitted over the transmission medium.
18. The method of claim 16 , further comprising shuffling the polarity of the particular set of six symbols using states of the side scrambling values.
19. The method of claim 1 , wherein generating the side scrambling values comprises generating the side scrambling values using a linear feedback shift register (LFSR).