DSP Wireless Systems Engineer

Apple Inc.; Pennsylvania; On-site; USD 166,000 - 297,000; Full time

Job summary

Join a forward-thinking company as a Wireless System Engineer, where you will tackle unique challenges in designing and optimizing wireless systems. This role offers a chance to work with cutting-edge technologies, collaborating with a dynamic team to innovate and enhance product performance. You will be instrumental in architecting calibration methods and implementing algorithms that significantly improve power efficiency and data rates. With a strong emphasis on hands-on lab work and digital design, this position promises a rewarding career path in a company that values creativity and excellence. If you are passionate about technology and eager to make a difference, this is the opportunity for you.

Benefits

Comprehensive medical and dental coverage

Retirement benefits

Discounted products and free services

Tuition reimbursement for formal education

Employee stock purchase plan

Discretionary bonuses

Relocation assistance

Qualifications

• 10+ years of relevant industry experience in wireless systems.
• Hands-on experience with lab testing and characterization.
• Strong understanding of RF impairments and calibration methods.

Responsibilities

• Design and simulate wireless transmitters for high data rate applications.
• Architect and implement calibration algorithms for performance enhancement.
• Test and characterize real silicon to ensure optimal performance.

Skills

Digital Signal Processing (DSP)

Wireless Communications Systems

MATLAB

Python

C/C++

RF/Analog Design

Lab Testing & Characterization

Algorithm Development

Education

BS in Engineering

MSEE/PhD

Tools

Spectrum Analyzer

Signal Generator

Signal Analyzer

Power Meter

Job description

At Apple, we work every single day to craft products that enrich people’s lives. Do you love working on challenges that no one has solved yet? Do you like changing the game? We have an opportunity for a forward-thinking and unusually hardworking Wireless System Engineer. As a member of our dynamic group, you will have the rare and extraordinary opportunity to craft upcoming products that will delight and encourage millions of Apple’s customers every single day.

For wireless system, power amplifiers (PA) in the transmitter are the main source of power consumption. To improve efficiency, PA must be designed beyond the classic class-AB, together with enhancement using envelope tracing, or envelope elimination and restoration (EER, or polar transmitter). Those designs come with impairments or nonlinear distortion that need to be cleaned up using digital signal processing (DSP) techniques. RF/analog architectures with the help of DSP, their optimizations and calibrations are the critical technique to achieve such high performing systems.

In this technical role, you will be at the center of a silicon design group responsible for using digital algorithms or methods to improve the PA efficiency, reducing power consumption, but with acceptable linearity for high data rate applications. You will mainly work on architecting various calibration and correction methods for implementation in hardware/firmware and validation of overall performance enhancement through lab measurement. You will interact with RF/analog designers, software or firmware engineers, digital designers, product engineers, and architects to define and specify parts in the wireless systems. You will also get to work with digital designers and firmware designers to realize these methods with power and area efficient digital implementations, with high efficiency software implementations, and possibly with hardware acceleration. And to bring up, test, characterize, and optimize real silicon in lab to the production qualities.

Description

In this role, core responsibilities include, but are not limited to, the following:

• Design and simulate state-of-the-art wireless transmitter for very high data rate applications.
• Investigate innovative PA architectures, calibration algorithms, 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.

Minimum Qualifications

• 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, 802.11 WiFi, and/or Bluetooth/BLE.
• Course works and experience in circuit design.

Additional Requirements

At Apple, base pay is one part of our total compensation package and is determined within a range. This provides the opportunity to progress as you grow and develop within a role. The base pay range for this role is between $166,600 and $296,300, and your base pay will depend on your skills, qualifications, experience, and location.

Apple employees also have the opportunity to become an Apple shareholder through participation in Apple’s discretionary employee stock programs. Apple employees are eligible for discretionary restricted stock unit awards, and can purchase Apple stock at a discount if voluntarily participating in Apple’s Employee Stock Purchase Plan. You’ll also receive benefits including: Comprehensive medical and dental coverage, retirement benefits, a range of discounted products and free services, and for formal education related to advancing your career at Apple, reimbursement for certain educational expenses — including tuition. Additionally, this role might be eligible for discretionary bonuses or commission payments as well as relocation.

Apple is an equal opportunity employer that is committed to inclusion and diversity. We take affirmative action to ensure equal opportunity for all applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, Veteran status, or other legally protected characteristics.