DSP Wireless Systems Engineer
Company: Apple Inc.
Location: Sunnyvale
Posted on: October 19, 2024
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 techniques 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.DescriptionIn 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 possibly 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 composed
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.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 $175,800 and $312,200, 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. Learn more about Apple Benefits.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. Learn
more about your EEO rights as an applicant.
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Keywords: Apple Inc., Turlock , DSP Wireless Systems Engineer, IT / Software / Systems , Sunnyvale, California
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