DSP Wireless Systems Engineer

3 days ago

Irvine, California, United States Apple Full time
About the Role

We are seeking a highly skilled Wireless Systems Engineer to join our team at Apple. As a member of our dynamic group, you will have the rare opportunity to craft upcoming products that will delight and encourage millions of Apple's customers every single day.

Key Responsibilities
  • Design and simulate state-of-the-art wireless transmitters for very high data rate applications.
  • Investigate innovative PA architectures, calibration algorithms, and processing structures for performance enhancement.
  • Architect HW/FW/SW partitioning of various calibrations for area and time efficiency.
  • Implement system models of the analog front-end design, impairments, and come up with right controls and calibrations in C and MATLAB for optimal system performances.
  • Work with digital designers to realize these methods with power and area efficient digital implementations.
  • Work with firmware designers to realize these methods with high efficiency software implementation, and possibility hardware acceleration.
  • Bring up, test, and characterize real silicon with relevant implementation in lab.
Requirements
  • BS and a minimum of 10 years relevant industry experience.
  • Experience in designing relevant signal processing for wireless communications systems.
  • Understand the methods to estimate various RF impairments via direct equipment measurement or self-testing via loopback.
  • Experience with MATLAB or Python and/or C/C++ for algorithm development, modeling, and simulation.
  • Hands-on experience on lab testing & characterization will be essential (such as spectrum analyzer, signal generator, signal analyzer, power meter, etc.).
  • Some understanding of RF and analog components/modules composited of wireless communication systems, the possible impairments from those components, their impact to OFDM signals, and the corresponding calibration and impairment reduction methods/algorithms.
Preferred Qualifications
  • MSEE/PhD with relevant experience.
  • Proven track record of optimization algorithm, and its applications to RF calibration.
  • Previous experiences on digital predistortion, crest-factor reduction, nonlinear crosstalk/interference cancellation, and real-chip bring-up in lab.
  • Understand communication theory & signal processing related algorithms design (such as timing recovery, signal estimation and detection, automatic gain control, channel estimation, equalization, coding theory, etc.).
  • Knowledge in existing wireless communication protocols: 5G-NR/LTE/WCDMA/GSM, WiFi, and/or Bluetooth/BLE.
  • Course works and experience in circuit design.

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