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WCDMA3G_RakeReceiver


Description: Rake receiver
Library: 3GPPFDD 10-99, Rake Receiver
Class: SDFWCDMA3G_RakeReceiver

Parameters
Name Description Default Sym Type Range
ChipRate chip rate of system: Chip Rate 3.84Mcps Chip Rate 3.84Mcps   enum  
LinkDir link direction: Downlink, Uplink Downlink   enum  
PilotType basic pilot type: Multiplex Pilot, Downlink Common Pilot Multiplex Pilot   enum  
DL_DPCHType downlink dedicated physical channel: DPCH_15kbps_TF0_T2_P4, DPCH_15kbps_TF2_T2_P4, DPCH_30kbps_TF0_T2_P2, DPCH_30kbps_TF2_T2_P2, DPCH_30kbps_TF0_T2_P4, DPCH_30kbps_TF2_T2_P4, DPCH_30kbps_TF0_T2_P8, DPCH_30kbps_TF2_T2_P8, DPCH_60kbps_TF0_T2_P4, DPCH_60kbps_TF2_T2_P4, DPCH_60kbps_TF0_T2_P8, DPCH_60kbps_TF2_T2_P8, DPCH_120kbps_TF8_T4_P8, DPCH_120kbps_TF0_T4_P8, DPCH_240kbps_TF8_T4_P8, DPCH_240kbps_TF0_T4_P8, DPCH_480kbps_TF8_T8_P16, DPCH_480kbps_TF0_T8_P16, DPCH_960kbps_TF8_T8_P16, DPCH_960kbps_TF0_T8_P16, DPCH_1920kbps_TF8_T8_P16, DPCH_1920kbps_TF0_T8_P16, PCCPCH DPCH_30kbps_TF2_T2_P8   enum †
UL_DPDCHType uplink dedicated physical data channel: DPDCH_15kbps, DPDCH_30kbps, DPDCH_60kbps, DPDCH_120kbps, DPDCH_240kbps, DPDCH_480kbps, DPDCH_960kbps DPDCH_30kbps   enum  
UL_DPCCHType uplink dedicated physical control channel: DPCCH_15kbps_P6_TF2_F0_T2, DPCCH_15kbps_P8_TF0_F0_T2, DPCCH_15kbps_P5_TF2_F1_T2, DPCCH_15kbps_P7_TF0_F1_T2, DPCCH_15kbps_P6_TF0_F2_T2, DPCCH_15kbps_P5_TF2_F2_T1 DPCCH_15kbps_P6_TF2_F0_T2   enum †
DL_TXDiversity transmit diversity in downlink: No_Diversity, DL_STTD No_Diversity   enum  
SampleRate number of samples per chip 4 S int [1, 32]
PathNum number of paths or fingers of Rake 6 L int [1, 16]
MaxDelay maximum path delay in terms of chips 40 D int [PathNum, number of half chips of one slot]
SearchDir search path direction based on current timing: Forward, Backward, Bidirection Backward   enum  
DPCHNum number of DPCHs 2 M int [1, 16]
EstMethod estimation method based on DPCH: Averaging, Interpolation, WMSA, NoEst Interpolation   enum  
WMSASlotNum number of slots for WMSA method 1 K int [1, 8]
WFactors weighting factors used in WMSA method 1.0 1.0   real array (0, 1]
where
TFn = number of transmit format indicator bits
Tn = number of transmit power control bits
Pn = number of pilot bits
Fn = number of feedback indicator bits

Pin Inputs

Pin

Name

Description

Signal Type

1

SmpSig

received baseband complex envelope signal samples

complex

2

SprdCd

bit-wise product of spreading and scrambling codes for DPCHs
or Common Pilot Channel

multiple complex

Pin Outputs

Pin

Name

Description

Signal Type

3

CH1

combined signals of the first code channel

complex

4

WASym

combined signals of all code channels

multiple complex

Notes/Equations
  1. This subnetwork is used to implement coherent Rake receiver with maximal ratio combining (MRC) on multiple code channels.
    Each firing, S × T tokens are consumed at SmpSig, and T tokens are consumed at SprdCd, where T is the number of chips per slot. N tokens are produced at WASym, where N is the number of symbols per slot. N or 10 tokens are produced at CH1 in downlink or uplink, respectively. The number of signals at SprdCd is based on PilotType and DPCHNum. The number of signals at WASym depends on DPCHNum. The outputs at CH1 and WASym are delayed by one frame because of Rake receiver signal processing. The complex format of input at SprdCd is Cspread × (Cscramble,i + j × Cscramble,q ).
  2. The schematic for this subnetwork is shown in the following figure.

    WCDMA3G_RakeReceiver Schematic

References
  1. 3GPP Technical Specification TS25.211 V3.0.0,"Physical channels and mapping of transport channels onto physical channels (FDD)," October 1999.
  2. 3GPP Technical Specification TS25.213 V3.0.0,"Spreading and modulation (FDD)," October 1999.
  3. A. J. Viterbi, "CDMA: Principles of Spread Spectrum Communication," Wesley Publishing Company, 1995.
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