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3GPPFDD_DPCH



Description: Downlink DPCH simulator
Library: 3GPPFDD, Base Station
Class: SDF3GPPFDD_DPCH
Derived From: 3GPPFDD_DLPCodeSrcBase

Parameters

Name

Description

Default

Unit

Type

Range

SpecVersion

version of specifications: Version_03_00, Version_12_00, Version_03_02

Version_12_00

 

enum

 

DataPattern

source data pattern: random, PN9, PN15, bits_repeat, user_file

random

 

enum

 

RepBitValue

repeating data value

0xff

 

int

[0, 255]

UserFileName

user-defined data file name

datafile.txt

 

filename

 

ScrambleCode

index of scramble code

0

 

int

[0:512] for downlink;
[0, 16777215] for uplink

ScrambleOffset

scramble code offset

0

 

int

[0:15]

ScrambleType

scramble code type: normal, right, left

normal

 

enum

 

SpreadCode

index of spread code

0

 

int

[0:SF-1];
SF can be set by SlotFormat or equal to SpreadFactor;
SF is 256 if for CPICH, PICH or uplink DPCCH

TFCIField

TFCI field on/off switch: On, Off

Off

 

enum

 

TFCIValue

TFCI value

0

 

int

[0:1023]

TPCValue

transmit power control value in hexadecimal

0x5555

 

int

[0:0x7ffff]

tDPCHOffset

DPCH channel offset

0

 

int

[0:149]

TFCIPowerOffset

TFCI field power offset in decibels

0.0

dB

real

[-20:20]

TPCPowerOffset

TPC field power offset in decibels

0.0

dB

real

[-20:20]

PilotBitsNum

number of pilot bits: Pilot2, Pilot4, Pilot8, Pilot16

Pilot4

 

enum

 

PilotPowerOffset

pilot field power offset in decibels

0.0

dB

real

[-20:20]

SymbolRate

downlink physical channel symbol rate: DPCH_7_5ksps, DPCH_15ksps, DPCH_30ksps, DPCH_60ksps, DPCH_120ksps, DPCH_240ksps, DPCH_480ksps, DPCH_960ksps

DPCH_15ksps

 

enum

 

Pin Outputs

Pin

Name

Description

Signal Type

1

out

output data

complex

Notes/Equations
  1. This model is used to generate the downlink DPCH signal.
    This model performs the same as the Agilent signal generator instrument ESG-D Option 100.
  2. Each firing, 2560 tokens are output. The complex output data sequence is the spread and scrambled chips where SpreadCode and ScrambleCode specify the spread and scramble codes. The output sequence is repeated on a frame-by-frame basis.
  3. The combined parameters, such as symbol rate, number of pilot bits, TFCI field switch are converted to the slot format as defined in [1].
  4. The ScrambleCode i , ScrambleOffset k , and ScrambleType parameters are used together to determine the scrambling code n as follows:
    n = (16 ×  i ) + k + m
    • If ScrambleType is normal , then m = 0
    • If ScrambleType is right , then m = 16384
    • If ScrambleType is left , then m = 8192
  5. tDPCHOffset indicates the time offset of DPCH relative the SCH channel. The unit is 256 chips.
  6. If TFCIField is on, the TFCI value is converted into 10-bit binary equivalent and coded to 32 bits, then filled into TFCI field of each slot as defined in [2].
  7. The power offsets of TFCI field, TPC field and Pilot field of as expressed in decibels are relative to downlink data channel DPDCH.
  8. Hexadecimal TPC values are converted to their binary equivalent. The value 7F80 becomes 111 1111 1000 0000. Notice that there are 15 digits in the binary TPC value. Because one frame contains 15 time slots, one binary digit is assigned to each time slot. The assigned bit is then repeated enough times to fill the TPC bit field.

References
  1. 3GPP Technical Specification TS 25.211 V3.10.0, Physical channels and mapping of transport channels onto physical channels (FDD), March 2003, Release 1999.

    http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25211-3a0.zip

  2. 3GPP Technical Specification TS 25.212 V3.9.0, Multiplexing and Channel Coding (FDD), March 2003, Release 1999.

    http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25212-390.zip

  3. 3GPP Technical Specification TS 25.213 V3.7.0, Spreading and modulation (FDD), March 2003, Release 1999.

    http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25213-370.zip

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