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System Simulator >
System Component Models >
WCDMA Rake Receiver >
Multipath Delay Estimation (MPDE)

Multipath Delay Estimation (MPDE)

Property	Description	Units	Default	Range/Type
METHOD	Pilot Assisted {0} / Perfect {1}	None	0	[0, 1]/Integer
L	Number of paths	None	2	[1, 16]/Integer
G	Spreading factor	None	32	[2, Inf)/Integer
S	Number of samples per chip	None	4	[1, 128]/Integer
K	Number of slots for block-average power delay estimation	None	1	[1, Inf)/Integer
NP	Number of pilot symbols	None	4	[1, Inf)/Integer
ND	Number of data symbols	None	36	[0, Inf)/Integer
N0	Number of the first pilot symbol	None	0	[0, Inf)/Integer
DMAX	Maximum multipath delay (samples)	None	31	[0, Inf)/Integer
D0~D15	Multipath delays (samples)	None	0	[0, Inf)/Integer
RIN1	Input1 impedance	Ohm	Inf	(0, Inf]/Real
RIN2	Input2 impedance	Ohm	Inf	(0, Inf]/Real
RIN3	Input3 impedance	Ohm	Inf	(0, Inf]/Real
RIN4	Input4 impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input1	Received signal in complex envelope format (complex)
Input2	Optimum sample position (integer)
Input3	Spreading code (complex)
Input4	Pilot symbols (complex)
Output	Multipath delays, in terms of samples (integer)

Limits

, ,

Notes

1. The multi-path delay estimation model can be used to search multi-path and estimate multi-path delays. If Method is set to Pilot Assisted {0}, the multi-path delays are estimated using the corresponding spreading code and pilot symbols. This component consists of the sample selection and multi-path search, as shown in Fig.1. For detailed algorithm, please refer to the matched filter model. If Method is set to Perfect {1}, the multi-path delays are set to D₀~D_L-

2. Note that L delay values are outputted successively for each symbol.
Fig. 1 Block diagram of multipath delay estimation

Netlist Form

MPDE:NAME n1 n2 n3 n4 [METHOD=val] L=val G=val [S=val] [K=val] NP=val ND=val [N0=val]+ [DMAX=val] [D0=val,…, D15=val] [RIN1=val] [RIN2=val] [RIN3=val] [ROUT=val]

Netlist Example

MPDE:1 1 2 3 4 METHOD = 0 L =2 G = 32 S = 4 DMAX = 20 NP = 4 ND = 16 D0 = 1 D1 = 9

References

1. J. G. Proakis, Digital Communications, McGraw-Hill, 2001.

2. A. J. Viterbi, CDMA: Principles of Spread Spectrum Communication, Wesley Publishing Company, 1995.

3. K. Higuchi, H. Andoh, et al, “Experimental evaluation of combined effect of coherent RAKE combining and SIR-based fast transmit power control for reverse link of DS-CDMA mobile radio,” IEEE Journal on Selected Areas in Communications, vol. 18, No.8, pp.1526-1535, Aug. 2000.

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