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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
  1. This model is to simulate the transmitted signal distortion. The reference ideal signal S(k) is distorted by the mathematical model as:

    Z(k) = {C0+ C1[S(k)+ E (k)]}W k

    where

    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:

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