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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
WCDMA Rake Receiver >
   Transmission Power Control (TPC)       

Transmission Power Control (TPC)

 

 


Property

Description

Units

Default

Range/Type

SIR

Target (dB)

None

0

(-Inf, 200]/Real

FORGETTOR

Forgetting factor

None

0.1

[0.0, 1.0]/Real

INIT_SLOT

Number of initial invalid slots

None

10

[0, Inf)/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

Signal power (real)

Input2

Interference power (real)

Output

Transmission power control command: +1/ -1 (Integer)

 

Notes

1. The Transmission Power Control model can be used generate transmission power control com­mands (+/- 1) with an interval of one slot. +1 indicates increasing transmission power, and -1 indicates reducing transmission power.

2. Let I(k) be the interference power at the kth slot. Before being used to calculate SINR, the input interference power is pre-averaged using a first-order filter with forgetting factor as fol­lows

(1), where μ is the forgetting factor.

3. The measured SIR l(k) the kth slot is defined as

(2)
This value l(k) is compared to a pre-determined Target SIR (dB), if greater, transmission power control command -1 will be output, otherwise, +1 will be output.

Netlist Form

TPC:NAME n1 n2 n3 SIR=val [FORGETTOR =val] [INIT_SLOT =val] [RIN1=val] [RIN2=val] [ROUT=val]

Netlist Example

TPC:1 1 2 3 SIR = 0 FORGETTOR=1.0 INIT_SLOT =1

References

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

2. H. Andoh, M. Sawahashi, and F. Adachi, “Channel estimation filter using time-multiplexed pilot channel for coherent Rake combining in DS-CDMA mobile radio,” IEICE Trans. Com­mun., vol. E81-B, no. 7, pp. 1517–1526, July 1998.



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