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