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Methods and apparatus for serial channel operation are disclosed. An N+l -level signaling scheme is used to transmit N staggered but overlapping NRZ sub-sequences concurrently on a serial channel. Each sequence has a bit rate R and an essential bandwidth of R HZ. The combined bit rate of the channel is NxR, but due to a lack of correlation between the subsequences, the essential bandwidth remains approximately R Hz. The signaling scheme also contains redundancy that allows some errors to be detected and/or corrected. Other embodiments are also described and claimed.

Patent No. : US 9,121,205 B1

Date of Patent: Feb. 21, 2012

Filed: Mar. 20, 2008

Int. Cl: H04K 1/10 (2006.01)

U.S. Cl.: 375/260; 375/259

CPC Cl.: H04L 1/0063 (20130101); H04L 25/4904 (20130101); H04L 25/4917 (20130101); H04L 25/497 (2013.01)

Field of Search: 375/260, 375/259


Also available online as US 8121205.



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