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   Walsh Function Demodulator (WALSHDEM)       

Walsh Function Demodulator (WALSHDEM)

 

 


Property

Description

Units

Default

Range/Type

N

Walsh Order

None

6

[0, Inf)/Integer

RIN

Input impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

WF_NUM

Walsh Function Number

None

0

[0,2N-1)/Real

Ports

Input

Input signal (real)

Output

Output signal (real)

 

Notes

This model interprets the incoming signal as a binary signal. An input greater than 0.5V is inter­preted as a 1; any other input level is interpreted as a 0. The Walsh function demodulator takes 2N samples at a time, and correlates (XORs) them with the corresponding 2N Walsh functions speci­fied by WF_NUM. If the sum of the correlated samples is greater than 2N2, then the output is 1; otherwise, the output is 0. The time step of the output is 2N times the size of the input step.

Netlist Form

WALSHDEM:Name n1 n2 N=val WF_NUM=val [Rin=val] [Rout=val]

Netlist Example

WALSHDEM:1 1 2 N=6, WF_NUM=24

References

1. Mobile-Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System” TIA/EIA/IS-95-A, May 1995.



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