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3GPPFDD_UpLinkRF



Description: 3GPP FDD uplink signal source
Library: 3GPPFDD, User Equipment
Class: TSDF3GPPFDD_UpLinkRF
Derived From: baseARFsource

Parameters

Name

Description

Default

Symbol

Unit

Type

Range

ROut

Source resistance

DefaultROut

 

Ohm

real

(0, ∞)

RTemp

Temperature

DefaultRTemp

 

Celsius

real

[-273.15, ∞)

TStep

Expression showing how TStep is related to the other source parameters

1/3.84 MHz/SamplesPerChip

 

 

string

 

FCarrier

Carrier frequency

1950 MHz

 

Hz

real

(0, ∞)

Power

Power

dbmtow(24.0)

 

W

real

[0, ∞)

MirrorSpectrum

Mirror spectrum about carrier?: NO, YES

NO

 

 

enum

 

GainImbalance

Gain imbalance, Q vs I (dB)

0.0

 

dB

real

(∞, ∞)

PhaseImbalance

Phase imbalance, Q vs I

0.0

 

deg

real

(∞, ∞)

I_OriginOffset

I origin offset (percent)

0.0

 

 

real

(∞, ∞)

Q_OriginOffset

Q origin offset (percent)

0.0

 

 

real

(∞, ∞)

IQ_Rotation

IQ rotation

0.0

 

deg

real

(∞, ∞)

SamplesPerChip

Samples per chip

8

S

 

int

[2:32]

RRC_FilterLength

RRC filter length (chips)

16

 

 

int

[2:128]

SpecVersion

Specification version: Version 03_00, Version 12_00, Version 03_02

Version 12_00

 

 

enum

 

SourceType

Source type: UL_12_2, UL_768

UL_12_2

 

 

enum

 

Pin Outputs

Pin

Name

Description

Signal Type

1

RF

RF output

timed

2

I

I symbols

real

3

Q

Q symbols

real

Notes/Equations
  1. This 3GPP FDD uplink signal source generates a 12.2 and 768 kbps uplink RF signal with one dedicated transport channel (DTCH) and one dedicated control channel (DCCH). The RF signal has a chip rate of 3.84 MHz. The uplink is from the user equipment to the base station.
    To use this source RF carrier frequency (FCarrier) and power (Power) must be set.
    RF impairments can be introduced by setting the ROut, RTemp, MirrorSpectrum, GainImbalance, PhaseImbalance, I_OriginOffset, Q_OriginOffset, and IQ_Rotation parameters.
    3GPP FDD signal characteristics can be specified by setting the RRC_FilterLength, SpecVersion, and SourceType parameters.

    Note

    While the function of this model is similar to 3GPPFDD_RF_Uplink. some parameter and output pins are different.

  2. This signal source includes a DSP block, an RF modulator, and RF output resistance as illustrated in the following figure.

    Signal Source Block Diagram
    The ROut and RTemp parameters are used by the RF output resistance. The FCarrier, Power, MirrorSpectrum, GainImbalance, PhaseImbalance, I_OriginOffset, Q_OriginOffset, and IQ_Rotation parameters are used by the RF modulator. The remaining signal source parameters are used by the DSP block.
    The RF output from the signal source is at the frequency specified (FCarrier), with the specified source resistance (ROut) and with power (Power) delivered into a matched load of resistance ROut. The RF signal has additive Gaussian noise power set by the resistor temperature (RTemp).
    The I and Q outputs are baseband outputs with zero source resistance and contain the unfiltered I and Q chips available at the RF modulator input. Because the I And Q outputs are from the RF modulator inputs, the RF output signal has a time delay relative to the I and Q chips. This RF time delay (RF_Delay) is related to the RRC_FilterLength parameter value.

    RF_Delay = RRC_FilterLength/(3.84e6)/2 sec.

  3. This 3GPP FDD signal source model is compatible with Agilent E4438C ESG Vector Signal Generator, Option 400 (3GPP W-CDMA Firmware Option for the E4438C ESG Vector Signal Generator).
    Details regarding Agilent E4438C ESG for 3GPP FDD are included at the website http://www.keysight.com/find/signalstudio
  4. Regarding the 3GPP uplink signal frame structure, one frame has a time duration of 10 msec and consists of 15 slots. Each slot corresponds to one power control period and contains 2560 chips.
    There are two types of uplink dedicated physical channels: uplink dedicated physical data channel (uplink DPDCH) and uplink dedicated physical control channel (uplink DPCCH). These channels are I/Q code multiplexed within each radio frame.
    Uplink DPDCH is used to carry the DCH transport channel. There may be zero, one, or several uplink DPDCHs on each radio link.
    Uplink DPCCH is used to carry control information generated at Layer 1. The Layer 1 control information consists of known pilot bits to support channel estimation for coherent detection, transmit power-control (TPC) commands, feedback information (FBI), and an optional transport-format combination indicator (TFCI). The TFCI informs the receiver about the instantaneous transport format combination of the transport channels mapped to the simultaneously transmitted uplink DPDCH radio frame. There is only one uplink DPCCH on each radio link.
    The frame structure of the uplink dedicated physical channels is illustrated in the following figure. The following tables provide more information about each field.

    12.2 kbps Uplink Channel Frame Structure
  5. Parameter Details
    • ROut is the RF output source resistance.
    • RTemp is the RF output source resistance temperature in Celsius and sets the noise density in the RF output signal to (k(RTemp + 273.15)) Watts/Hz, where k is Boltzmann's constant.
    • FCarrier is the RF output signal frequency.
    • Power is the RF output signal power delivered into a matched load of resistance ROut.
    • MirrorSpectrum is used to mirror the RF_out signal spectrum about the carrier. This is equivalent to conjugating the complex RF envelope voltage.
      Depending on the configuration and number of mixers in an RF transmitter, the RF output signal from hardware RF generators can be inverted. If such an RF signal is desired, set this parameter to YES.
    • GainImbalance, PhaseImbalance, I_OriginOffset, Q_OriginOffset, and IQ_Rotation are used to add certain impairments to the ideal output RF signal. Impairments are added in the order described here.
      The unimpaired RF I and Q envelope voltages have gain and phase imbalance applied. The RF is given by:

      where A is a scaling factor based on the Power and ROut parameters specified by the designer, V I( t ) is the in-phase RF envelope, V Q( t ) is the quadrature phase RF envelope, g is the gain imbalance

      and, φ (in degrees) is the phase imbalance.
      Next, the signal V RF( t ) is rotated by IQ_Rotation degrees. The I_OriginOffset and Q_OriginOffset are then applied to the rotated signal. Note that the amounts specified are percentages with respect to the output rms voltage. The output rms voltage is given by sqrt(2 × ROut × Power).
    • SamplesPerChip is used to set the number of samples in a chip.
      The default value is set to 8 to display settings according to the 3GPP standard. It can be set to a larger value for a simulation frequency bandwidth wider than 8 × 3.84 MHz. It can be set to a smaller value for faster simulation times; however, this will result in lower signal fidelity. If SamplesPerChip = 8, the simulation RF bandwidth is larger than the signal bandwidth by a factor of 8 (e.g., simulation RF bandwidth = 8 × 3.84 MHz).
    • RRC_FilterLength is used to set root raised-cosine (RRC) filter length in chips.
      The default value is set to 16 to transmit a 3GPP FDD uplink signal in time and frequency domains based on the 3GPP standard [4]. It can be set to a smaller value for faster simulation times; however, this will result in lower signal fidelity.
    • SpecVersion is used to specify the 3GPP specification versions (2000-03, 2000-12 and 2002-03).
    • SourceType is used to specify the type of baseband signal. Reference measurement channels (RMC) 12.2 and 768 kbps as defined in [4] and [5] are available.
      Basic parameters of 12.2 kbps RMC (SourceType = UL_12_2) are listed in the following tables.
      Uplink 12.2 kbps Reference Measurement Channel, Physical Parameters

      Parameter

      Unit

      Level

      Information bit rate

      kbps

      12.2

      DPDCH

      kbps

      60

      DPCCH

      kbps

      15

      DPCCH Slot Format

       

      0

      DPCCH/DPDCH power ratio

      dB

      -5.46

      TFCI

       

      On

      Repetition

      %

      23

      Uplink 12.2 kbps Reference Measurement Channel, DPDCH Fields

      Channel Bit Rate (kbps)

      Channel Symbol Rate (ksps)

      SF

      Bits/Frame

      Bits / Slot

      Ndata

      60

      60

      64

      600

      40

      40

      Uplink 12.2 kbps Reference Measurement Channel, DPCCH Fields

      Channel Bit Rate (kbps)

      Channel Symbol Rate (ksps)

      SF

      Bits/Frame

      Bits / Slot

      Npilot

      NTPC

      NTFCI

      NFBI

      15

      15

      256

      150

      10

      6

      2

      2

      0

      Uplink 12.2 kbps Reference Measurement Channel, Transport Channel Parameters

      Parameter

      DTCH

      DCCH

      Transport Channel Number

      1

      2

      Transport Block Size

      244

      100

      Transport Block Set Size

      244

      100

      Transmission Time Interval

      20 ms

      40 ms

      Type of Error Protection

      Convolution Coding

      Convolution Coding

      Coding Rate

      1/3

      1/3

      Rate Matching attribute

      256

      256

      Size of CRC

      16

      12

      Basic parameters of 768 kbps RMC (SourceType = UL_768) are listed in the following tables.
      Uplink 768 kbps Reference Measurement Channel, Physical Parameters

      Parameter

      Unit

      Level

      Information bit rate

      kbps

      2*384

      DPDCH1

      kbps

      960

      DPDCH2

      kbps

      960

      DPCCH

      kbps

      15

      DPCCH Slot Format

       

      0

      DPCCH/DPDCH power ratio

      dB

      -11.48

      TFCI

       

      On

      Puncturing

      %

      18

      Uplink 768 kbps Reference Measurement Channel, Transport Channel Parameters

      Parameter

      DTCH

      DCCH

      Transport Channel Number

      1

      2

      Transport Block Size

      3840

      100

      Transport Block Set Size

      7680

      100

      Transmission Time Interval

      10 ms

      40 ms

      Type of Error Protection

      Turbo Coding

      Convolution Coding

      Coding Rate

      1/3

      1/3

      Rate Matching attribute

      256

      256

      Size of CRC

      16

      12

      768 kbps Reference Measurement Channel,DPDCH Fields

      Channel Bit Rate (kbps)

      Channel Symbol Rate (ksps)

      SF

      Bits/Frame

      Bits/Slot

      Ndata

      960

      960

      4

      9600

      640

      640

      † There are two DPDCHs in uplink 768 kbps RMC.
      Uplink 768 kbps Reference Measurement Channel, DPCCH Fields

      Channel Bit Rate (kbps)

      Channel Symbol Rate (ksps)

      SF

      Bits / Frame

      Bits / Slot

      Npilot

      NTPC

      NTFCI

      NFBI

      15

      15

      256

      150

      10

      6

      2

      2

      0

References
  1. 3GPP Technical Specification TS 25.211, "Physical channels and mapping of transport channels onto physical channels (FDD)" Release 1999. http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25211-3a0.zip
  2. 3GPP Technical Specification TS 25.212, "Multiplexing and Channel Coding (FDD)" Release 1999. http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25212-390.zip
  3. 3GPP Technical Specification TS 25.213, "Spreading and modulation (FDD)" Release 1999. http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25213-370.zip
  4. 3GPP Technical Specification TS 25.101, "UE Radio Transmission and Reception (FDD)" Release 1999. http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25101-3a0.zip
  5. 3GPP Technical Specification TS 25.104, "BS Radio transmission and Reception (FDD)" Release 1999. http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25104-3a0.zip
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