Page tree
Skip to end of metadata
Go to start of metadata


3GPPFDD_DL_Rx_RefCH



Description: Downlink integrated reference measurement channel receiver
Library: 3GPPFDD, User Equipment
Class: SDF3GPPFDD_DL_Rx_RefCH

Parameters

Name

Description

Default

Unit

Type

Range

SpecVersion

version of specifications: Version_03_00, Version_12_00, Version_03_02

Version_12_00

 

enum

 

RefCh

reference measurement channel: DL_REF_12_2, DL_REF_64, DL_REF_144, DL_REF_384

DL_REF_12_2

 

enum

 

SampleRate

sample rate

8

 

int

[1:256]

ScrambleCode

index of scramble code

0

 

int

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

ScrambleOffset

scramble offset in downlink channels

0

 

int

[0:15]

ScrambleType

scramble type: Normal, RightAlternate, LeftAlternate

Normal

 

enum

 

MaxDelaySample

maximum delay boundary, in terms of samples

1

 

int

[0:2559]

ChannelType

select the channel type to be processed: CH_GAUSSIAN, CH_FADING

CH_GAUSSIAN

 

enum

 

ChannelInfo

fading channel information source: Known, Estimated

Known

 

enum

 

ChannelInfoOffset

offset between spread code and channel information in terms of sample

0

 

int

[0:MaxDelaySample]

PathSearch

path search frequency: EverySlot, Once

Once

 

enum

 

SearchMethod

path search method: Coherent, NonCoherent, Combined

Coherent

 

enum

 

SearchSlotsNum

number of slots for path search

1

 

int

[1:6]

PathNum

number of Rake fingers

1

 

int

[1:6]

PathDelaySample

delay for each finger, in terms of samples

0

 

int array

[0:MaxDelaySample];
array size shall be equal to PathNum

DPCH_SpreadCode

spread code index of DPCH

127

 

int

[0:127] for 12.2kbps;
[0:31] for 64kbps;
[0:15] for 144kbps;
[0:7] for 384kbps

CPICH

select if CPICH is presented: CPICH_Active, CPICH_Deactive

CPICH_Deactive

 

enum

 

RxPCCPCH

select if PCCPCH is presented: PCCPCH_Active, PCCPCH_Deactive

PCCPCH_Deactive

 

enum

 

RxSCCPCH

select if SCCPCH is presented: SCCPCH_Active, SCCPCH_Deactive

SCCPCH_Deactive

 

enum

 

SCCPCH_SlotFormat

SCCPCH slot format

0

 

int

[0:17]

SCCPCH_SpreadCode

SCCPCH spread code

15

 

int

[0:SpreadFactor-1];
Spread factor is set by SCCPCH_SlotFormat

SCCPCH_Carrying

common channel that SCCPCH carries: PCH, NonPCH

NonPCH

 

enum

 

Pin Inputs

Pin

Name

Description

Signal Type

1

inChip

input data stream

complex

2

inRefDTCH

reference DTCH

int

3

inRefDCCH

reference DCCH

int

4

inRefDTCHCoder

reference DTCH after channel coding

int

5

inRefDCCHCoder

reference DCCH after channel coding

int

6

inRefDPCHSym

reference DPCH symbol

real

7

inChM

channel information

multiple complex

Pin Outputs

Pin

Name

Description

Signal Type

8

DTCH

DTCH data

int

9

RefDTCH

synchronized reference DTCH

int

10

DTCH_CRC

DTCH CRC

int

11

DCCH

DCCH data

int

12

RefDCCH

synchronized reference DCCH

int

13

DCCH_CRC

DCCH CRC

int

14

DTCHCoder

DTCH before channel decoding

int

15

RefDTCHCoder

synchronized reference DTCH before channel decoding

int

16

DCCHCoder

DCCH before channel decoding

int

17

RefDCCHCoder

synchronized reference DCCH before channel decoding

int

18

DPCH

DPCH data

int

19

RefDPCH

synchronized reference DPCH

int

Notes/Equations
  1. This subnetwork model is the integrated receiver for UTRA/WCDMA 3GPP downlink. The basic function is to decode the downlink reference measurement channel as defined in the 3GPP specification. The signal processing flow covers the full 3GPP physical layer; it is symmetric to, but in reverse order of, the signal source. (To view the schematic, push into this model in the schematic window.)
  2. The despread and demodulated bits obtained from the 3GPPFDD_DL_Rake model are fed to transport channel processing models (rate de-match, channel decoding, etc.).
  3. The physical channel bit stream is delayed 1 frame (15 slots or 10 msec). The delay for each of the two transport channels is equal to the TTI for the associated transport channel. Therefore, the reference outputs from the source are taken as inputs and are delayed in order to align with the decoded bit stream. The delayed data will be discarded for BER/FER measurement.
  4. This design can be a template to set up integrated receivers for other multiplexed services.
  5. The TFCI is set as a constant to avoid propagating the TFCI decoding error to for the final BER performance. If the TFCI is input from the TFCI decoder, there will be a degradation of approximately 1 dB in BER performance. In case the TFCI is variable, it's better to get the error-free TFCI from the signal source.
  6. If the 3GPP signal is S(t), this signal may be delayed t1 by some filters (such as the Tx RC filters). So, the delayed signal is S(t-t1) and the signal from 0 to t1 is zero and the real 3GPP signal transmission starts from t1. When the delayed signals pass through a fading channel, the fading factor is applied to the overall signals starting at time 0. Offset t1 must be known if the receiver of the channel information is input from outside; this offset is expressed in terms of samples.

References
  1. Refer to References.
  • No labels