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Telecom
baseband-modem
cellular baseband modem
Qualcomm modems
System
Techniques · 8
Primitives · 29
baseband-modem
AKA (authentication and key agreeme…
security · medium: Symmetric-key challenge-response in which a chip and its home server prove knowledge of one key, with a sequence number for freshness, and derive session keys.
›
Channel estimation
signal-processing · medium: Pilot-based LS/MMSE channel estimation and interpolation across time and frequency
Ldpc codes
signal-processing · medium: Low-density parity-check codes with soft-decision min-sum decoding, used in NAND flash
Mimo detection
signal-processing · medium: Linear MMSE, SIC and sphere decoding to separate spatially multiplexed streams
Ofdm time frequency synchronization
signal-processing · medium: Cell search and synchronization: PSS/SSS correlation, CFO and timing estimation
Polar codes
signal-processing · medium: Polar codes with successive-cancellation list decoding and CRC aid
Turbo codes
signal-processing · medium: Parallel concatenated convolutional codes with iterative BCJR/max-log-MAP decoding
Fast Fourier transform
numerics · low: Computes the DFT in O(n log n) by recursively splitting into even and odd halves; the basis of fast convolution and spectral methods.
›
Ofdm modulation
signal-processing · low: OFDM via IFFT/FFT, cyclic prefix, subcarrier mapping and PAPR handling
SIMD programming
hardware-os · low: Process 4-16 lanes per instruction with AVX2, AVX-512 or NEON via Rust std::arch, with runtime dispatch and a portable fallback.
›
Qam soft demapping
signal-processing · low: PSK/QAM constellation mapping and max-log LLR soft demapping for decoders
CRC32C checksums
hardware-os · low: The Castagnoli CRC-32 with dedicated instructions on x86 (SSE4.2) and ARMv8. It is the standard fast integrity check for storage blocks, logs and network frames.
›
Low power duty cycling
embedded · low: MCU sleep states, wake sources and radio duty cycling to run years on a battery
Deterministic fixed-point math
game-networking · low: Bit-identical simulation math across CPUs, compilers and builds: integer fixed-point formats, the float traps (FMA, x87, fast-math, libm), deterministic trig, sqrt and RNG.
›
Asn1 encoding
networking · low: ASN.1 schemas with BER/DER/PER encodings used in X.509 and 3GPP signalling
Selective repeat arq
networking · low: Selective-repeat ARQ with windows, status reports and in-order reassembly
Digital down conversion
signal-processing · low: NCO mixing to baseband, CIC/FIR decimation and IQ handling for SDR receivers
Hybrid arq
signal-processing · low: HARQ with chase/incremental-redundancy soft combining and parallel stop-and-wait processes
Robust header compression
signal-processing · low: ROHC context-based compression of IP/UDP/RTP headers over radio links
Hierarchical state machine
systems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.
›
HKDF key derivation (extract-and-ex…
security · low: HMAC-based two-step key derivation: extract a uniform pseudorandom key from any secret, then expand it into as many context-bound keys as you need.
›
Message authentication codes (HMAC,…
security · low: A keyed short tag proving a message is unmodified and came from a key holder; pick HMAC, CMAC, KMAC or a one-time polynomial MAC by what primitive you already have.
›
Replay protection window
security · low: A highest-seen counter plus a bitmap of the last W numbers rejects duplicates and stale messages in O(1) with a few hundred bytes of state.
›
+ 1 more techniques
+ 13 more primitives
System
Techniques · 8
Primitives · 29
baseband-modem
AKA (authentication and key agreeme…
security · medium: Symmetric-key challenge-response in which a chip and its home server prove knowledge of one key, with a sequence number for freshness, and derive session keys.
›
Channel estimation
signal-processing · medium: Pilot-based LS/MMSE channel estimation and interpolation across time and frequency
Ldpc codes
signal-processing · medium: Low-density parity-check codes with soft-decision min-sum decoding, used in NAND flash
Mimo detection
signal-processing · medium: Linear MMSE, SIC and sphere decoding to separate spatially multiplexed streams
Ofdm time frequency synchronization
signal-processing · medium: Cell search and synchronization: PSS/SSS correlation, CFO and timing estimation
Polar codes
signal-processing · medium: Polar codes with successive-cancellation list decoding and CRC aid
Turbo codes
signal-processing · medium: Parallel concatenated convolutional codes with iterative BCJR/max-log-MAP decoding
Hardware security module (HSM)
security · medium: A tamper-resistant device or service that generates keys, signs, decrypts and wraps with them internally, and releases a key only as ciphertext.
›
Fast Fourier transform
numerics · low: Computes the DFT in O(n log n) by recursively splitting into even and odd halves; the basis of fast convolution and spectral methods.
›
Ofdm modulation
signal-processing · low: OFDM via IFFT/FFT, cyclic prefix, subcarrier mapping and PAPR handling
SIMD programming
hardware-os · low: Process 4-16 lanes per instruction with AVX2, AVX-512 or NEON via Rust std::arch, with runtime dispatch and a portable fallback.
›
Qam soft demapping
signal-processing · low: PSK/QAM constellation mapping and max-log LLR soft demapping for decoders
CRC32C checksums
hardware-os · low: The Castagnoli CRC-32 with dedicated instructions on x86 (SSE4.2) and ARMv8. It is the standard fast integrity check for storage blocks, logs and network frames.
›
Low power duty cycling
embedded · low: MCU sleep states, wake sources and radio duty cycling to run years on a battery
Deterministic fixed-point math
game-networking · low: Bit-identical simulation math across CPUs, compilers and builds: integer fixed-point formats, the float traps (FMA, x87, fast-math, libm), deterministic trig, sqrt and RNG.
›
Asn1 encoding
networking · low: ASN.1 schemas with BER/DER/PER encodings used in X.509 and 3GPP signalling
Selective repeat arq
networking · low: Selective-repeat ARQ with windows, status reports and in-order reassembly
Digital down conversion
signal-processing · low: NCO mixing to baseband, CIC/FIR decimation and IQ handling for SDR receivers
Hybrid arq
signal-processing · low: HARQ with chase/incremental-redundancy soft combining and parallel stop-and-wait processes
Robust header compression
signal-processing · low: ROHC context-based compression of IP/UDP/RTP headers over radio links
Hierarchical state machine
systems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.
›
HKDF key derivation (extract-and-ex…
security · low: HMAC-based two-step key derivation: extract a uniform pseudorandom key from any secret, then expand it into as many context-bound keys as you need.
›
Message authentication codes (HMAC,…
security · low: A keyed short tag proving a message is unmodified and came from a key holder; pick HMAC, CMAC, KMAC or a one-time polynomial MAC by what primitive you already have.
›
Replay protection window
security · low: A highest-seen counter plus a bitmap of the last W numbers rejects duplicates and stale messages in O(1) with a few hundred bytes of state.
›
LU and Cholesky factorization
numerics · low: Factor A = PLU (any square matrix, partial pivoting) or A = LLᵀ (SPD) once in O(n³), then solve each right-hand side in O(n²).
›
Spline interpolation
numerics · low: Linear, bilinear/trilinear and cubic spline interpolation on grids and tables
Sparse matrices (CSR)
numerics · low: Compressed sparse row stores only nonzeros as row pointers, column indices and values; SpMV streams them once, so it is memory-bandwidth bound.
›
d-ary heap
data-structures · low: Array heap with d children per node (d = 4 typical): half the binary heap's depth, siblings in one cache line, faster priority queues.
›
Peak detection
signal-processing · low: Robust peak and event detection in noisy signals with adaptive thresholds and refractory periods
Phase-locked loop (digital)
signal-processing · low: Feedback loop that locks a local oscillator to the phase and frequency of an input tone; the core of carrier recovery, clock recovery and GNSS tracking.
›
Top-k selection
search-sort · low: Keep the k best of n items without sorting all n - bounded min-heap for streams, quickselect for arrays, threshold pruning to skip most items.
›
Convolutional codes and the Viterbi…
signal-processing · low: Streaming error-correcting code: each output bit is a parity of the last K input bits; the Viterbi decoder finds the most likely path through a 2^(K-1)-state trellis.
›
Aes key wrap
security · low: AES Key Wrap (RFC 3394/5649) and AES-GCM-SIV for deterministic, authenticated wrapping of key material
Csprng
security · low: OS-backed cryptographically secure random numbers (getrandom), and when a fast PRNG is not enough
Dual control approval
security · low: Four-eyes / maker-checker approval with quorum policies for sensitive operations
Secure memory zeroization
security · low: Keep secrets in one locked, fixed-size, non-copyable region, erase them with writes the compiler must keep, and exclude them from dumps and swap.
›
PRNGs (PCG, xoshiro)
numerics · low: Small, fast, statistically strong non-cryptographic generators: PCG32 and xoshiro256**, with seeding, parallel streams and unbiased ranges.
›
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