Systems and methods for transition encoding compatible PAM4 encoding
A system includes a first encoder configured to receive first input bits and generate a first stream of first bits based on the first input bits, a bit generator configured to receive second inputs bits and generate a second stream of second bits based on the second input bits, and a PAM4 transmitter configured to receive the first stream of first bits and the second stream of second bits, and generate PAM4 symbols based at least on the first stream of first bits.
1. A system comprising:
a first encoder configured to receive first input bits and generate a first stream of first bits by applying transition encoding to the first input bits based on a transition key;
a bit generator configured to receive second inputs bits and generate a second stream of second bits based on the second input bits; and
a Pulse-Amplitude Modulation 4-Level (PAM4) transmitter configured to receive the first stream of first bits and the second stream of second bits, and generate PAM4 symbols based at least on the first stream of first bits,
wherein the first stream of first bits comprises half an amount of bits comprising the transition key and encoded data bits, and the second stream of second bits comprises a remaining half of the bits comprising the transition key and the second input bits.
2. The system of claim 1 , wherein the first stream of first bits correspond to most significant bits of the PAM4 symbols generated by the PAM4 transmitter.
3. The system of claim 2 , wherein the PAM4 symbols are further based on the second stream of second bits, wherein the second stream of second bits correspond to the least significant bits of PAM4 symbols.
4. The system of claim 3 , wherein the second stream of second bits is generated by applying transition encoding to the second input bits.
5. The system of claim 3 , wherein the second stream of second bits is generated by the bit generator inserting padding bits to the second input bits.
6. The system of claim 1 , wherein the first encoder is configured to generate the encoded data bits by performing an exclusive OR (XOR) operation on the transition key and the first input bits.
7. The system of claim 2 , wherein each PAM4 symbol corresponds to one bit from the first stream of first bits and one bit from the second stream of second bits.
8. A method comprising:
generating, by a first encoder, a first stream of first bits by applying transition encoding to first input bits provided to the first encoder based on a transition key;
generating, by a bit generator, a second stream of second bits based on second input bits provided to the bit generator; and
generating, by a Pulse-Amplitude Modulation 4-Level (PAM4) transmitter, PAM4 symbols based at least on the first stream of first bits received by the PAM4 transmitter,
wherein the first stream of first bits comprises half an amount of bits comprising the transition key and encoded data bits, and the second stream of second bits comprises a remaining half of the bits comprising the transition key and the second input bits.
9. The method of claim 8 , wherein the first stream of first bits correspond to most significant bits of the PAM4 symbols generated by the PAM4 transmitter.
10. The method of claim 9 , wherein the generating the PAM4 symbols is further based on the second stream of second bits, wherein the second stream of second bits correspond to least significant bits of the PAM4 symbols generated by the PAM4 transmitter.
11. The method of claim 10 , wherein the generating the second stream of second bits comprises applying transition encoding to the second input bits.
12. The method of claim 10 , wherein the generating the second stream of second bits comprises generating padding bits and inserting the padding bits to the second input bits.
13. The method of claim 8 , wherein the generating the first stream of first bits further comprises performing an exclusive OR (XOR) operation on the transition key and the first input bits.
14. A transition encoding compatible PAM4 encoder, comprising:
a first transition encoder configured to receive first input bits and generate a transition encoded first stream of first bits by applying transition encoding to the first input bits based on a transition key;
a bit generator configured to receive second inputs bits and generate a second stream of second bits based on the second input bits; and
a Pulse-Amplitude Modulation 4-Level (PAM4) transmitter configured to receive the first stream of first bits and the second stream of second bits, and generate PAM4 symbols, wherein a most significant bit of the PAM4 symbol is based on the first stream of first bits, and a least significant bit of the PAM4 symbol is based on the second stream of second bits,
wherein the first stream of first bits comprises half an amount of bits comprising the transition key and encoded data bits, and the second stream of second bits comprises a remaining half of the bits comprising the transition key and the second input bits.