通信算法之一百零六：End-to-End QAM Simulation with RF Impairments and Corrections

Posted 2023-03-05 leeshao12

 

 

Simulation Overview

The simulation executes the following steps:

• Generate random integers

• Modulate with 16-QAM

• Root raised cosine (RRC) transmit filter

• Pass through an HPA

• Apply transmit antenna gain

• Apply path loss based on atmospheric condition

• Pass the signal through an AWGN channel with RF impairments

• Apply receive antenna gain

• Remove DC offset

• Apply automatic gain control

• RRC receive filter

• Apply ADC effects

• Compensate for I/Q amplitude and phase imbalance

• Correct for the Doppler shift

• Demodulate 16-QAM

• Calculate the bit error rate

 

You can specify the following signal impairments:

• Receiver noise temperature in the range [0, 600] K

• Doppler error in the range [-3, 3] Hz

• DC offset, expressed as a percentage of the maximum signal voltage, in the range [0, 20]

• Phase noise in the range [-100, -48] dBc/Hz

• I/Q amplitude imbalance in the range [-5, 5] dB

• I/Q phase imbalance in the range [-30, 30] degrees

• HPA backoff level in the range [1, 30] dB

• Quantization error by changing the number of ADC bits in the range of [2 16] bits

• Saturation due to ADC full scale voltage in the range of [0.1 2] amplitude units (AUs)