3GPPFDD UpLinkRF

3GPPFDD_UpLinkRF

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

Parameters

Pin Outputs

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