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WCDMA3G_PathSearch


Description: Multiple path maximum power timing search
Library: 3GPPFDD 10-99, Rake Receiver
Class: SDFWCDMA3G_PathSearch
Derived From: WCDMA3G_RakeBase

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  
where
TF n = number of transmit format indicator bits
T n = number of transmit power control bits
P n = number of pilot bits
F n = 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

complex

Pin Outputs

Pin

Name

Description

Signal Type

3

Delays

searched timing of path delay in terms of samples

int

Notes/Equations
  1. This model is used to search and determine the timing of multiple paths. Each path timing corresponds to one propagation path of radio.
    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. L tokens are produced at Delays. The output at Delays is delayed by one slot because signals of multiple path may be overlapped on adjacent slots. The complex format of input at SprdCd is Cspread × (Cscramble,i + j × Cscramble,q ).
    Path search direction based on current slot timing is determined by SearchDir.

References
  1. 3GPP Technical Specification TS25.211 V3.0.0,"Physical channels and mapping of transport channels onto physical channels (FDD)," October 1999.
  2. A. J. Viterbi, "CDMA: Principles of Spread Spectrum Communication," Wesley Publishing Company, 1995.
  3. S.Fukumoto, M.Sawahashi, F.Adachi, "Matched Filter-Based RAKE Combiner for Wideband DS-CDMA Mobile Radio," IEICE Trans. Commun., Vol., E81-B, No.7, July 1998.
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