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WCDMA3G_UpLkGainFactor


Description: Gain factor generator
Library: 3GPPFDD 10-99, Spreading & Modulation
Class: SDFWCDMA3G_UpLkGainFactor

Parameters

Name

Description

Default

Type

Range

GenerateMethod

generate method: Signalled, Calculated

Signalled

enum

 

TrCHNum

number of all transport channels

1

int

[0, ∞)

RM

semi-static rate matching attribute

1

real array

[0.0, ∞)

Beta_d_ref

reference gain factor for DPDCH

1.0

real

[0.0, 1.0]

Beta_c_ref

reference gain factor for DPCCH

1.0

real

[0.0, 1.0]

TrCHType

dedicated channel type: Dedicated Channel, Dedicated Measurement Channel

Dedicated Channel

enum

 

Pin Inputs

Pin

Name

Description

Signal Type

1

InSize

current block size

multiple int

2

TFMax

maximum transport format

multiple int

Pin Outputs

Pin

Name

Description

Signal Type

3

Beta_d

gain factor for DPDCH

real

4

Beta_c

gain factor for DPCCH

real

Notes/Equations
  1. This model is used to generate the gain factor for uplink transmission. One Beta_d and one Beta_c token is produced for each InSize token consumed. If GenerateMethod is Signalled, Beta_d_ref and Beta_c_ref are output directly as the Beta_d and Beta_c.
  2. Uplink DPCCH and DPDCH are transmitted with different power. After channelization, spread factors are weighted by gain factors βc for DPCCH and βd for the DPDCHs. Every instant, at least one of the βc and βd has the 1.0 amplitude. β values are quantized into 4-bit words. Quantization steps are given in the following table.
    Quantization Steps

    Signalling Values
    for βc and βd

    Quantized Amplitude
    Ratios βc and βd

    15

    1.0

    14

    0.9333

    13

    0.8666

    12

    0.8000

    11

    0.7333

    10

    0.6667

    9

    0.6000

    8

    0.5333

    7

    0.4667

    6

    0.4000

    5

    0.3333

    4

    0.2667

    3

    0.2000

    2

    0.1333

    1

    0.0667

    0

    switch off

  3. Gain factors vary on radio frame basis based on the current TFC used. There are two ways to control gain factors of DPCCH and DPDCH codes for different TFCs:
    • Signalled for the TFC from higher layers, the signalled values are used directly for weighting of DPDCHs and DPCCH.
    • Calculated for the TFC, based on the signalled settings for a reference TFC.
      Let and denote the reference gain factors
      Let and denote the gain factors used for the TFC in the j th radio frame.


      RMi is the semi-static rate matching attribute for transport channel ; is the number of bits output from the radio frame segmentation block for transport . The sum is taken over all the transport channels. is for the reference TFC and the is for the current TFC used in the frame.

      If >1, = 1.0, means rounding to the closest lower quantized value in the table above.
      If <1, = 1.0, means rounding to the closest higher quantized value in the table above.

References
  1. 3GPP Technical Specification, TS 25.213, V3.0.0, "Spreading and modulation (FDD)," October 1999.
  2. 3GPP Technical Specification, TS 25.214, V3.0.0, "Physical Layer Procedures (FDD)," October 1999.
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