Radio Channel Emulation System Architect, KRAKÓW

• 4G/5G NR radio and PHY/L1 understanding: OFDM, modulation/coding, HARQ, reference signals (SSB, CSI RS, DMRS), channel estimation/equalization, link adaptation (CQI/RI/PMI), power control; familiarity with FR1/FR2, FDD/TDD and typical deployment scenarios.
  
• Radio propagation and channel modelling: pathloss, shadowing, delay spread, multipath fading, Doppler, interference, spatial correlation, and their impact on throughput, BLER, coverage and MIMO gains; experience or theoretical knowledge of 3GPP channel models (TDL/CDL) in simulations or lab tests.
  
• MIMO and beamforming: SU/MU MIMO, massive MIMO, analog/digital/hybrid beamforming; working with antenna arrays, beams, channel matrices and precoding weights.
  
• Digital signal processing for communications: filtering, FFTs, time frequency transforms, channel convolution, noise modelling, SNR/SINR; implementing or analysing PHY algorithms (channel estimation, equalization, detection, combining).
  
• System level RAN understanding: gNB DU–RU split, fronthaul basics (CPRI/eCPRI), end to end UE–DU–RU interaction and channel emulation impacts.
  
• Analytical and communication skills: ability to turn feature requirements into meaningful test/channel scenarios, argue for assumptions, lead technical discussions across RAN system, PHY and test teams, and produce structured documentation and presentations.

About the Opportunity
Join our 4G/5G/6G RAN Simulation Services System Team in Poland, where you will shape an internally developed radio channel emulator capable to emulate RF radio channel conditions (pathloss, noise, spatial beams, interference, etc.) in a fully digital test environment so that RAN solutions can be verified without real radios or over-the-air channels. We seek a system minded telecom engineer who can translate RAN test needs into emulatable channel conditions, lead cross site technical discussions, and drive studies from concept to verified solution in a fully digital test environment.

We work in hybrid model, min. 3 days from office

What do we offer:

• Annual bonus depending on the achievement of the company's goals and results


• Possibility to take advantage of the reduction of tax-deductible costs for creative work


• Financial awards and distinctions


• Private medical care for employee and their family (Medicover)


• Life insurance


• Mental Help Line


• Cafeteria system Pluxee platform: co-financing MultiSport or OK System card, lunch cards, and others


• Sports and integration activities (e.g. Football, Joga, raising team, climbing club)


• Company support (loans and grants)


• Possibility to participate in 3G / 4G / 5G... 6G technology projects


• Opportunity to participate in technical and interpersonal training conducted by international trainers


• Access to recognized learning platforms (Pluralsight, Skillsoft, Coursera)


• Opportunity to work in an international environment, also outside Poland

,[    Own the end to end lifecycle of 5G RAN studies using the Digital Channel Emulator (idea, design, execution, documentation, hand over). ,    Define study objectives, scenarios, KPIs and acceptance criteria with product management, system architects and line leadership. ,    Analyze study results, identify performance bottlenecks, propose optimizations for the digital channel emulator and connected simulators. ,    Collaborate with system, software and test engineers to ensure study outcomes feed into requirements, architecture and implementation. ,    Prepare clear reports and presentations, including recommendations and risk/impact assessments. ,    Ensure compliance with Ericsson quality, documentation and traceability standards.] Requirements: 4G, 5G, Testing, DSP, Radio Additionally: Sport Subscription, Private healthcare, Lunch card, International environment, Annual bonus, Pluralsight, Life insurance.