SENIOR DSP DESIGN ENGINEER

About Us:

Join a team that is redefining the accessibility of space. Azista space is a transformative force in the global aerospace sector, uniquely positioned at the intersection of indigenous innovation and industrial scalability. Operating India's first private-sector satellite mass-production facility in Ahmedabad, we have bridged the gap between complex engineering and high-volume manufacturing.

As a vertically integrated leader, we provide end-to-end solutions from the precision design of satellite buses and advanced payloads to mission management and communication systems. We don't just build hardware, we are democratizing the final frontier by providing global clientele with the cost-effective, high-performance technology needed to power the next generation of orbital missions. At Azista, you won't just be starting a job, you'll be fuelling the future of space exploration.

Role Overview:

We are looking for a Senior DSP Design Engineer – SDR & Satellite Communications to lead the development of high-reliability communication modems for space systems. In this role, you will architect and deliver FPGA-based SDR modem solutions for telemetry, telecommand, and high-throughput satellite links (DVB-S2/S2X).

You will work at the intersection of digital signal processing, RF systems, and FPGA implementation, driving mission-critical communication subsystems from concept to flight readiness. This is a high-impact opportunity to contribute directly to next-generation satellite platforms and space exploration technologies while collaborating with cross-functional teams in RF, hardware, and systems engineering.

Roles & Responsibilities:

• Architect end-to-end SDR communication modems for telemetry (TM), telecommand (TC), and DVB-S2/S2X high-throughput satellite links
• Design and optimize PHY-layer algorithms including synchronization (carrier, timing, frame), modulation, pulse shaping, and packetization
• Develop robust error correction and detection schemes (LDPC, BCH, Turbo, Reed-Solomon) to ensure high link reliability
• Implement and validate DVB-S2/S2X modem chains, including APSK modulation, framing, and Adaptive Coding & Modulation (ACM)
• Perform link budget analysis and optimize spectral efficiency, throughput, and link margin under real-world constraints
• Design RF sampling architectures (direct RF, IF sampling, multi-Nyquist techniques) and optimize ADC/DAC performance
• Collaborate with FPGA teams to build high-throughput baseband pipelines using Xilinx platforms, AXI4-Stream, and fixed-point DSP
• Integrate modem solutions with RF transceivers (AD9361, AD9371, AFE7950) and high-speed interfaces (JESD204B/C)
• Develop advanced algorithms for channel impairment mitigation (CFO correction, Doppler compensation, phase noise, equalization)
• Lead verification and validation efforts, including BER/FER analysis, Eb/N0 characterization, HIL testing, and OTA validation
• Support hardware bring-up, debugging, and system integration using lab instrumentation (VSA/VSG, spectrum analyzers, oscilloscopes)
• Collaborate across teams to define ICDs, system budgets, and performance metrics, contributing to design reviews (PDR/CDR)

Required Qualifications & Skills:

Technical Expertise

1) Strong experience in Digital Communication Systems & Modem Design

• PHY-layer design, frame synchronization, modulation (BPSK, QPSK, APSK)
• Error correction coding: LDPC, BCH, Turbo, Reed-Solomon
• Hands-on experience with DVB-S2 / DVB-S2X implementations

2) Deep knowledge of Digital Signal Processing (DSP)

• Synchronization (carrier, timing, frame), estimation & detection theory
• Multi-rate DSP and real-time signal processing

3) Expertise in RF Sampling & Data Conversion

• Nyquist and multi-Nyquist sampling, aliasing, spectral planning
• High-speed ADC/DAC systems, clocking, jitter analysis

4) Experience with FPGA-based SDR Systems

• Xilinx platforms, fixed-point design, RTL/HDL workflows
• AXI interfaces, streaming architectures, timing closure

5) Strong understanding of RF Systems & Transceiver Integration

• RF impairments (phase noise, IQ imbalance, non-linearity)
• Interfaces: JESD204B/C, LVDS, DUC/DDC processing
• Experience with transceivers like AD9361, AD9371, AFE7950

6) Proficiency in Simulation & Validation Tools

• MATLAB / Python for link-level simulation and algorithm development
• Familiarity with HDL simulation and verification

Experience:

• 5+ years in DSP, SDR, or modem design for communication systems
• Proven experience in satellite communications, aerospace, or defense systems
• Track record of delivering high-reliability, real-time communication systems

Soft Skills:

• Strong ownership across architecture, implementation, and validation
• Ability to collaborate across DSP, FPGA, and RF engineering teams
• Excellent problem-solving and debugging skills in complex signal chains
• Clear communication for technical design reviews and cross-team alignment
• Execution-driven mindset with focus on performance, scalability, and reliability

Preferred Qualifications (Nice to Have):

• M.Tech / MS in Communication Systems, Signal Processing, or related field
• Experience with space-grade systems or flight-qualified hardware
• Exposure to EMI/EMC testing and environmental validation