Example 5G Testing: Resolving the Throughput Test Case Issue with PHY Knowledge 

Test case failures: Intermittent throughput drops are observed in 5G PDSCH test cases.

By various regression and golden-reference tests, engineers identify failed test cases are related to mismatch between key system configurations with wireless channel setups. 

However, engineers are unable to explain why the tests fail and under what conditions the tests fail. 

After the training, test engineers understand how specific PHY system configurations can lead to Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI). 

PHY configurations are re-adjusted to remove the ISI and ICI in the newly defined test cases. By eliminating the ISI and ICI, intermittent throughput drops disappeared. The issue is resolved. 

The key root cause is found to be the misconfigured OFDM system parameters under particular Doppler and multipath setups, causing ISI and ICI that degrade the throughput performance.

Review our Lecture 1 Video to understand how ISI and ICI are related to the wireless channel and OFDM system parameters.

Existing Training Course Strengths

This course provides engineers with a streamlined explanation of how the PHY receiver works under practical system setups and physical wireless channel conditions.

There are no overwhelming mathematical formulas; concepts are delivered in straightforward ways other than dense theories.

Course contents cover key 5G PHY implementation details. Example critical contents are:

• How the wireless receivers are designed, including channel estimator, signal detector, and LDPC decoder

  • Assist the debugging of PDSCH and PUSCH issues

• How the pilots and sounding signals are designed and detected in the receiver 

  • Assist  the debugging of SRS detection issues

• How the received signal dynamic range is related to the noise floor and ADC resolutions

  • Assist  the debugging of receiver analog signal power and ADC sampling issues

• How beamforming and beam management are done in PHY and MAC

  • Help the debugging of initial access issues

• How PSS based synchronization is done in PHY

  • Help the debugging of SSB synchronization issues

Many other topics cover system knowledge including multi-cell precoding, link adaptation, non-terrestrial networks, O-RAN architecture, positioning techniques, etc. These topics provide engineers with broad knowledge of the wireless system. 

Training Services Strengths

Our training services can provide customized training content to supplement the training course content. 

The customized training content can include: 

•  Particular contents raised by the questions from engineers 

  • Help the engineers to understand particular technical details

• Particular contents related to unresolved test issues in your tests

  • Help the team to resolve particular issues in your tests

• Other content according to the requests of the team

  • Assist to broaden your system knowledge according to your needs

Training Instructor 

The course lectures are developed by highly experienced experts of 20+ years of experience in wireless system development, testing, research and professional education. 

LinkedIn Profile of Dr. Xueyuan Zhao, training course instructor

Content us if you have any further questions: 

Email: info@innomountain-inc.com

Phone: (617) 299-0819