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WCDMA3G_CHModel


Description: 3GPP channel model for antenna array
Library: 3GPPFDD 10-99, Channel Model
Class: SDFWCDMA3G_CHModel

Parameters

Name

Description

Default

Sym

Type

Range

ChannelModel

test environment (Delay, Power, and Doppler Spectrum of each path): Indoor A, Indoor B, Pedestrian A, Pedestrian B, Vehicular A, Vehicular B

Vehicular B

 

enum

 

Carrier

carrier frequency in GHz.

2.0

fc

real

(0, ∞)

ChipRate

chip rate of system

3840000

 

int

[1, ∞)

SampleRate

samples per chip.

4

 

int

[1, ∞)

Velocity

mobile velocity in km/hour.

100.0

V

real

(0, ∞)

N

2N + 1 is the number of sine wave that form a complex Gaussian process.

100

 

int

[1, ∞)

AntennaNumber

number of antennas

1

 

int

[1, ∞)

AntennaSpace

interval between two antenna elements in meters

0.075

 

real

(0, ∞)

ArrivingAngle

arriving angle in degrees for each path.

75.0 45.0 15.0 -15.0 -45.0 -75.0

A

real array

(-∞, ∞)

Pin Inputs

Pin

Name

Description

Signal Type

1

in

input signal to channel.

complex

Pin Outputs

Pin

Name

Description

Signal Type

2

out

output signal from channel.

multiple complex

Notes/Equations
  1. This model is used to simulate a multi-path fading channel based on tapped-delay line model [1]. Each firing, one token is consumed at the input, and one token is produced at the output. There is no path loss or gain in this model.
  2. The following figure shows the functional block diagram. In the diagram, tap delay, multi-path power distribution, and Doppler spectrum (used by Jakes model) is defined in [1].

    Block Diagram of Channel Model based on Tapped-Delay Line
    The following three tables describe the tapped-delay-line parameters. For each tap of the channels three parameters are given: the time delay relative to the first tap, the average power relative to the strongest tap, and the Doppler spectrum of each tap.
    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.
    Antenna array is also considered in the channel model. Multi-path signal is summed and coupled to the output multi-port after phase shift using D and A.

    Jakes Model

    Indoor Office Test Environment Tapped-Delay-Line Parameters
    Tap Channel A Channel B Doppler Spectrum
    Relative Delay (nSec) Average Power (dB) Relative Delay (nSec) Average Power (dB)
    1 0 0 0 0 FLAT
    2 50 -3.0 100 -3.6 FLAT
    3 110 -10.0 200 -7.2 FLAT
    4 170 -18.0 300 -10.8 FLAT
    5 290 -26.0 500 -18.0 FLAT
    6 310 -32.0 700 -25.2 FLAT

    Outdoor to Indoor and Pedestrian Test Environment Tapped-Delay-Line Parameters
    Tap Channel A Channel B Doppler Spectrum
    Relative Delay (nSec) Average Power (dB) Relative Delay (nSec) Average Power (dB)
    1 0 0 0 0 CLASSIC
    2 110 -9.7 200 -0.9 CLASSIC
    3 190 -19.2 800 -4.9 CLASSIC
    4 410 -22.8 1200 -8.0 CLASSIC
    5     2300 -7.8 CLASSIC
    6     3700 -23.9 CLASSIC

    Vehicular Test Environment, High Antenna, Tapped-Delay-Line Parameters
    Tap Channel A Channel B Doppler Spectrum
    Relative Delay (nSec) Average Power (dB) Relative Delay (nSec) Average Power (dB)
    1 0 0 0 -2.5 CLASSIC
    2 310 -1.0 300 0 CLASSIC
    3 710 -9.0 8900 -12.8 CLASSIC
    4 1090 -10.0 12900 -10.0 CLASSIC
    5 1730 -15.0 17100 -25.2 CLASSIC
    6 2510 -20.0 20000 -16.0 CLASSIC

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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