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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
WCDMA Rake Receiver >
Despreader (DESPREADER)

Despreader (DESPREADER)

Property	Description	Units	Default	Range/Type
L	Number of paths	None	2	[1, 16]/Integer
G	Spreading factor	None	32	[2, Inf]/Integer
S	Number of samples per chip	None	4	[1, 128]/Integer
DMAX	Maximum multipath delay for multi-path (samples)	None	31	[0, Inf)/Integer
RIN1	Input1 impedance	Ohm	Inf	(0, Inf]/Real
RIN2	Input2 impedance	Ohm	Inf	(0, Inf]/Real
RIN3	Input3 impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input1	Received signal in complex envelope format (complex)
Input2	Multipath delays, in terms of samples (integer)
Input3	Spreading code (complex)
Output	Symbols after despreading on each path (complex)

Limits

Notes

1. The despreader model can be used to resolve the received multi-path signal and despread symbols on each path in DS/CDMA systems. For detailed algorithm, please refer to the matched filter model.

2. Note that L samples are outputted successively for each symbol.

Netlist Form

DESPREADER:NAME n1 n2 n3 n4 L=val G=val [S=val] [DMAX=val] +[RIN1=val] [RIN2=val] [RIN3=val] [ROUT=val]

Netlist Example

DESPREADER:1 1 2 3 4 L =2 G = 32 S = 4 DMAX = 20

References

1. J. G. Proakis, Digital Communications, McGraw-Hill, 2001.

2. A. J. Viterbi, CDMA: Principles of Spread Spectrum Communication, Wesley Publishing Company, 1995.

3. K. Higuchi, H. Andoh, et al, “Experimental evaluation of combined effect of coherent RAKE combining and SIR-based fast transmit power control for reverse link of DS-CDMA mobile radio,” IEEE Journal on Selected Areas in Communications, vol. 18, No.8, pp.1526-1535, Aug. 2000.

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