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3GPPFDD_UL_Rx_RefCH



Description: Uplink integrated reference measurement channel receiver
Library: 3GPPFDD, Base Station
Class: SDF3GPPFDD_UL_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: UL_REF_12_2, UL_REF_64, UL_REF_144, UL_REF_384_10, UL_REF_384_20, UL_REF_768, UL_REF_2048

UL_REF_12_2

 

enum

 

DPCCH_SltFmt

DPCCH slot format

0

 

int

[0:5]

ScrambleCode

index of scramble code

0

 

int

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

ScrambleType

scramble type: Long, Short

Long

 

enum

 

SampleRate

sample rate

8

 

int

[1:256]

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

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

inRefDPDCH

reference DCCH

multiple int

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

DPDCH

DPDCH data

int

19

RefDPDCH

synchronized reference DPDCH

int

Notes/Equations
  1. This integrated receiver for UTRA/WCDMA 3GPP uplink decodes the uplink reference measurement channel defined in 3GPP specifications. The signal processing flow covers the full 3GPP physical layer. The process is symmetric but in reverse order as at the signal source side.
  2. The uplink Rake receiver is at the front of this receiver; refer to 3GPPFDD_UL_Rake for more information. The despread and demodulated bits obtained from the Rake receiver are fed to the transport channel processing models for rate de-matching, channel decoding, and so on.
  3. Note that the physical channel bit stream has been 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 to be aligned with the decoded bit stream. The delayed data will be discarded when measuring BER/FER.
  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 the final BER performance. A degradation of approximately 1 dB in BER performance occurs if the TFCI is input from the TFCI decoder. If the TFCI is variable, it is better to get the error-free TFCI from the signal source side.
  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 from time 0. The 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.
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