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Duobinary With Precode Coding Model (DUOBINP)

Duobinary With Precode Coding Model (DUOBINP)

Property	Description	Units	Default	Range/Type
Offset	Voltage shift of output level	Volt	0.0	[-INF, INF]/Real
Level	Output signal amplitude	Volt	1.0	[0, INF]/Real
N	Oversampling factor	None	1	[1, INF]/Real
RIN	Input impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	(0, Inf]/Real
Ports
Input	Input sequence (real)
Output	Output sequence (real)

Notes

For Duobinary with Pre-coding , the input is exclusive-ORed with a previous value of the the exclusive-OR output. This value passes through a digital filter comprised of a one sample delay. Each binary value is represented by –1 for a low input value and +1 for a high input value. The output is equal to the sum of the delayed exclusive-OR symbol and the input exclusive-OR symbol, which will produce three possible values of –2, 0, and +2. The initial delayed input value is low.

For decoding purposes, no memory is needed. A 0 represents a high input value. Any non-zero value represents a low input value.

Input		1	0	1	1	1	0	0	1
Precode	0	1	1	0	1	0	0	0	1
Bipolar	-1	+1	+1	-1	+1	-1	-1	-1	+1

Output		0	+2	0	0	0	-2	-2	0

Netlist Form

ADUOBIN_P:NAME n1 n2 Nexsys_component=duobin_p Offset=val Level=val N=val [RIN=val] [ROUT=val]

Netlist Example

ADUOBIN_P:1 1 2 Nexsys_component=duobin_p
+ Offset=1.1 Level=2.2 N=2

Reference

[1] Bernard Sklar, Digital Communications Fundamental and Applications, Prentice-Hall 1988

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