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CDMA/IS-95 >
   Walsh Function Generator (WALSHGEN)       

Walsh Function Generator (WALSHGEN)

 

 


Property

Description

Units

Default

Range/Type

N

Number of bits per modulation symbol

None

6

[0, Inf)/Integer

WF_NUM

Number of the Walsh function

None

0

[0,2N-1)/Real

NUM_SYMBOLS

Number of modulation symbols

None

100

[0, Inf)/Integer

BR

Bit rate at the output

MHz

1.2288

([0, Inf)/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Output

Output signal (real)

 

Notes

1. This model generates NUM_SYMBOL modulation symbols. Each modulation symbol is composed of 2N bits. The modulation symbol generated is based on the Walsh function (Reference 1) number WF_NUM which selects a modulation symbol out of 2N modulation symbols.

Netlist Form

WALSHGEN:Name n1 N=val WF_NUM=val NUM_SYMBOLS=val BR=val [Rout=Val]

Netlist Example

WALSHGEN 1 N=6 WF_NUM=0 NUM_SYMBOLS=100 BR=1.2288MHZ

In this example, 20 samples are read from the input signal to Output1 at n = 2 followed by 30 samples to Output2 at n = 3 followed by 20 samples to Output1 and so on until no more sam­ples exist at the input port.

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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