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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
WCDMA Rake Receiver >
   Rake Combiner (RAKECOMBINER)       

Rake Combiner (RAKECOMBINER)

 

 


Property

Description

Units

Default

Range/Type

L

Number of paths

None

2

[1, 16]/Integer

RIN1

Input impedance

Ohm

Inf

(0, Inf]/Real

RIN2

Input impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input1

Received signal in complex envelope format (complex)

Input2

Channel estimates (complex)

Output

Rake-combined signal (complex)

 

Notes

1. The Rake Combiner model can be used to generate a Rake-combined signal.

2. Rake-combining is performed based on maximum ratio criteria. Maximal ratio criteria is a weighted signal combining method in which the weighting factor for each signal to be com­bined is the strength of the signal if the phase factor is not considered. Let rl(n,k) be the nth received symbol at the output of the matched filter in the kth slot for the lth resolved path, and nl(n,k) be corresponding channel estimate. The output of the Rake Combiner for the nth sym­bol of the kth slot is represented by


(1)
where L is the number of resolved paths, * denotes the complex conjugate. In order to under­stand this model better, a block diagram of Rake receiver used in time-multiplexed pilot chan­nel is given, as shown in Fig. 1.

Fig. 1 Block Diagram of Rake Receiver

Netlist Form

RAKECOMBINER: NAME n1 n2 n3 L=val [RIN1=val] [RIN2=val] [ROUT=val]

Netlist Example

RAKECOMBINER:1 1 2 3 L =2

References

1. 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.

2. T. Dohi, Y. Okumura, et al, “Further results on field experiments of coherent wideband DS-CDMA mobile radio,” IEICE Trans. Commun., vol. E81-B, pp. 1239–1247, June 1998.



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