3GPPFDD_Distort
Description: signal distortion
Library: 3GPPFDD, Measurement
Class: SDF3GPPFDD_Distort
Parameters
Name |
Description |
Default |
Unit |
Type |
Range |
|---|---|---|---|---|---|
C0 |
constant I/Q imbalance |
0 |
|
complex |
(∞, ∞) |
C1 |
constant phase offset |
1.0 |
|
complex |
(∞, ∞) |
dr |
frequency error real part |
0 |
|
real |
(∞, ∞) |
da |
frequency error image part |
0 |
|
real |
(∞, ∞) |
BurstLen |
burst length |
40960 |
|
int |
[1, ∞) |
EVM |
EVM value |
0.0 |
|
real |
[0, ∞) |
RefMeanSquare |
reference signal mean square |
1.0 |
|
real |
(0.0, ∞) |
Pin Inputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
1 |
In |
signal for interpolation |
complex |
Pin Outputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
2 |
Out |
output interpolated signal |
complex |
Notes/Equations
- This model is to simulate the transmitted signal distortion. The reference ideal signal S(k) is distorted by the mathematical model as:
whereZ(k) = {C0+ C1[S(k)+ E (k)]}W k
W = exp( dr + jda ) accounts for the instantaneous frequency offset da and amplitude change dr per chip.
C0 is constant original offset representing quadrature modulator imbalance.
C1 is a complex constant representing the arbitrary phase and output power of the transmitter.
E(k) is the residual vector of S(k), simulated by an AWGN of which the variance is determined by EVM and the mean square of S( k). The relationship of E(k), S(k), and EVM is:
