Wireless & satellite modem cores

Full DVB-S2X transmit chain from BBFRAME input to shaped IQ output: mode adaptation, stream merging, BCH and LDPC encoding, bit interleaving, constellation mapping, physical-layer framing with pilot insertion, and SRRC pulse shaping. Variable and adaptive coding and modulation are driven per frame from the control plane, so a scheduler can change MODCOD on a frame boundary without a datapath flush.

• All 128 S2X MODCODs plus the legacy S2 set, including VL-SNR frames
• VCM, ACM and CCM operation with per-frame MODCOD selection
• Roll-off 35 %, 25 %, 20 %, 15 %, 10 % and 5 %
• Optional wideband mode: up to 500 Mbaud on a single carrier
• Physical-layer scrambling with programmable gold-code index
• Built-in DVB-S2X compliant test-pattern generator

Key specifications

Receive counterpart to ALF-RF-S2X-TX. Performs matched filtering, timing and carrier recovery, frame synchronisation, MODCOD detection, soft-decision demapping and LDPC/BCH decoding. The acquisition engine performs a two-stage frequency search so the core locks without external assistance across a wide carrier offset, which is what makes it usable on low-symbol-rate VL-SNR links where the frequency uncertainty exceeds the symbol rate.

• Acquisition down to −10 dB Es/N0 in VL-SNR mode
• Carrier offset tolerance ±20 % of symbol rate at acquisition
• Pilot-aided and non-pilot tracking with phase-noise-robust loops
• Automatic MODCOD and frame-type detection from the PLHEADER
• Per-frame SNR, frequency offset and LDPC iteration count reporting
• Optional multi-stream de-multiplexing and null-packet re-insertion

Key specifications

Base-station physical layer covering the 3GPP Release 17 downlink and uplink channel set. Delivered as a set of connected sub-cores — resource mapping, OFDM modulation, channel estimation, MIMO detection and the control channels — so a radio-unit design can take the whole chain or only the parts not already implemented in the accompanying SoC.

• PDSCH, PDCCH, PBCH, CSI-RS, SSB on the downlink
• PUSCH, PUCCH formats 0–4, PRACH and SRS on the uplink
• Numerologies μ = 0–3, 15 to 120 kHz subcarrier spacing
• Up to 4×4 single-user MIMO, MMSE-IRC detection
• Integrated LDPC coding via ALF-RF-LDPC-ENC and ALF-RF-LDPC-DEC
• FAPI-style control interface for the L2/L3 stack

Key specifications

Single-carrier QAM and APSK modem for links that are not covered by a broadcast standard — proprietary point-to-point radios, high-rate telemetry downlinks and instrumentation channels. Constellation, filter response, framing and pilot structure are all configurable, and the carrier and timing loops are dimensioned for the amplitude-sensitive constellations rather than shared with a PSK design.

• 16/32/64/128/256-QAM and 16/32/64/256-APSK
• Adaptive decision-directed equaliser, up to 64 taps
• Programmable SRRC or user-supplied shaping filter coefficients
• Blind acquisition: modulation, symbol rate and offset estimation
• Configurable unique-word framing with soft correlation
• Pairs with any core in the ALF-RF channel-coding family

Key specifications

Single-carrier PSK modem for links where the amplifier runs close to saturation and the constellation has to survive it: telemetry, ranging, tactical links and low-SNR command channels. Acquisition holds well below 0 dB Es/N0 on the lower orders, and the loops are dimensioned for phase noise rather than for amplitude accuracy.

• BPSK, QPSK, OQPSK, 8-PSK and 16-PSK
• Acquisition to −5 dB Es/N0 at BPSK with a known symbol rate
• Programmable SRRC or user-supplied shaping filter coefficients
• Differential encoding and phase-ambiguity resolution
• Configurable unique-word framing with soft correlation
• Pairs with any core in the ALF-RF channel-coding family

Key specifications

Continuous-phase modulation transceiver for links that run the power amplifier at saturation. Covers the aeronautical telemetry and space telemetry profiles, with a trellis-based detector whose complexity is a build-time parameter so the implementation-loss versus resource trade-off is yours to make.

• GMSK, SOQPSK-TG, ARTM CPM and multi-h CPM formats
• Full-response and partial-response pulse shapes
• Reduced-complexity trellis detector, configurable state count
• Joint carrier-phase and symbol-timing recovery
• IRIG-106 and CCSDS 401.0-B compliant profiles
• Optional differential encoding and pre-coding

Key specifications

Space-link modem implementing the CCSDS telemetry and telecommand synchronisation and channel coding recommendations. Written to a radiation-tolerant coding style — no inferred latches, distributed triple-modular-redundancy option on all control registers and a scrubbing-friendly memory structure — for use in flight FPGAs.

• CCSDS 131.0-B telemetry and 231.0-B telecommand framing
• GMSK, filtered OQPSK, BPSK and residual-carrier PCM/PM modes
• Concatenated convolutional + Reed–Solomon and CCSDS LDPC options
• Optional TMR on state machines and configuration registers
• Pseudo-noise ranging channel with regenerative option
• SEU-tolerant coding style; no vendor-specific primitives

Key specifications

A parameterised OFDM transceiver for teams building a waveform that no standard describes. Frame structure, pilot pattern, cyclic-prefix length, FFT size and the synchronisation strategy are all described in a configuration file, from which the core elaborates a matched transmitter, receiver and reference model. Targeting first release in Q4 2026.

• FFT sizes from 64 to 8 192 points
• User-defined preamble, pilot pattern and frame structure
• Selectable synchronisation strategy: Schmidl–Cox, CP-based or hybrid
• Per-subcarrier channel estimation with configurable interpolation
• Configuration file drives the VHDL, testbench and reference model together
• Optional windowing and filtered-OFDM spectral shaping

Key specifications