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WCDMA3G_UserDefinedCH


Description: channel model with user definitions
Library: 3GPPFDD 10-99, Channel Model
Class: SDFWCDMA3G_UserDefinedCH

Parameters

Name

Description

Default

Sym

Type

Range

Carrier

carrier frequency

2.0

fc

real

(0, ∞)

ChipRate

chip rate of system

3840000

 

int

[1, ∞)

SampleRate

samples per chip

8

S

int

[1, 32]

Velocity

mobile velocity in km/hour

100.0

V

real

(0, ∞)

AntennaNumber

number of antennas

1

M

int

[1, ∞)

AntennaSpace

interval between two antennas

0.075

D

real

(0, ∞)

PathNumber

number of multiple paths

2

N

int

[1, 6]

PathDelay

delay in ns for all paths, 1st pathDelay as 0ns

0 5

 

int array

[0, ∞)

AveragePower

delay in dB for all paths, 1st pathPower as 0dB

0.0 -1.0

 

real array

(-∞, ∞)

ArrivingAngle

arriving angle(degrees) for each path

0.0 0.0

A

real array

(-∞, ∞)

Pin Inputs

Pin

Name

Description

Signal Type

1

in

input signal to channel model

complex

Pin Outputs

Pin

Name

Description

Signal Type

2

out

output signal from channel model

multiple complex

Notes/Equations
  1. This model is used to simulate a multi-path fading channel based on a tapped-delay line model. There is no path loss or gain in this model.
    Each firing, one token is consumed at the input, and one token is produced at the output.
  2. The following figure illustrates the number of taps (number of paths), tap delay, and multi-path power distribution as defined by the designer. Jakes model uses classical Doppler spectrum.

    Channel Model based on Tapped-Delay Line
    Jakes model uses N 0 low-frequency oscillators with frequencies equal to the Doppler shifts ωn=ωmcos(2π n/N) ( n =1,2, ..., N 0) plus one with frequency ωm to generate signals frequency-shifted from a carrier frequency 2π fc, where ωm=2π V/ l, l denotes wave-length of carrier and N 0=8, N=2×(2× N 0+1) is used in the component. The amplitudes of all the components are made equal to unity except for the one with frequency ωm, which is set equal to , as illustrated in the following figure. For more information about Jakes model, refer to [2].
    Antenna array is also considered in the channel model. Multi-path signal is summed and coupled to the output signals after phase shift using D and A.

    Jakes Model

References
  1. Draft New Recommendation ITU-R M.[FPLMT.REVAL], Guidelines for Evaluation of Radio Transmission Technologies for IMT-2000/FPLMTS (Question ITU-R 39/8).
  2. William C. Jakes, "Microwave Mobile Communications," IEEE Press, 1994.
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