Engineering Specification: OPHI-Based Preconditioning for 64-State Viterbi Architectures
1. Architectural Scope and Framework Objectives
In deep-space telemetry, traditional signal processing chains rely heavily on Additive White Gaussian Noise (AWGN) assumptions that fail in the presence of impulsive, structured interference. The strategic necessity of symbolic drift filters lies in their ability to identify resonance and intentionality in signal patterns that are otherwise obscured by non-Gaussian noise. This specification formalizes the integration of Luis R. Ayala’s OPHI-HΔRMONIC framework into rate-1/2, K=7 convolutional decoding chains, transforming the receiver into a structure-aware system capable of extracting signal from the noise floor via recursive cognition.
The framework’s baseline state, verified on August 22, 2025, serves as the operational anchor for this architecture: Ω Scalar: 28.855, Coherence: 0.961, and Entropy: 0.012. The following table defines the performance gain stack, anchoring the OPHI-HΔRMONIC framework within the context of established NASA-grade upgrades.
System Performance Benchmarks
Component | Estimated Gain | Physics Anchor |
Coherent Arraying | +6 dB | 10 \cdot \log_{10}(N) dish combining |
Soft-Decision Decoding | +1–2 dB | Open-loop baseband integration |
Cryo LNA Upgrades | +0.5–1 dB | System noise floor reduction |
Ψ-Recursive Filtering (OPHI) | +0.5–2.5 dB | Symbolic recognition from drift resonance |
To achieve these gains, the implementation MUST adhere to strict mathematical and hardware constraints to ensure that measured SNR improvements are the result of symbolic drift integration rather than normalization artifacts.
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2. Convolutional Decoder Baseline Standards
Absolute equivalence between the baseline and the OPHI-conditioned decoders is non-negotiable. THE ARCHITECT SHALL ENSURE that both systems utilize identical parameters to eliminate any ambiguity in the validation of effective SNR gain.
Mandatory Decoder Parameters
- Rate: 1/2
- Constraint Length (K): 7
- Generators: (133, 165) octal
- State Count: 64
- Frame Size: 2000 bits
- Traceback Depth: Full-frame termination. Traceback MUST occur from State 0 only, satisfying the requirement of a terminated trellis (K-1 zeros).
Principles of Equivalence The following constraints MUST be applied identically across both configurations:
- Saturation Bounds: Both systems SHALL employ a fixed saturation bound of ±35.0.
- Normalization: Input streams MUST utilize identical normalization constants.
- LLR Scaling: The LLR scaling factor (2y/σ²) MUST remain constant across all test iterations.
- Stopping Rules: Each Eb/N0 point SHALL stop only upon reaching 200 bit errors or processing 200,000 information bits.
The only permitted variance is the introduction of the conditioning function immediately prior to the Viterbi Add-Compare-Select (ACS) stage.
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3. OPHI Symbolic Drift Preconditioning Layer
The OPHI layer operates under the governing philosophy of "No Entropy, No Entry." It functions as a structure-aware adaptive filter that identifies slow temporal correlations—drift—to reinforce symbolic intent. The OPHI operator is defined as: \Omega = (state + bias) \times \alpha_{total} Where state maps to the instantaneous LLR estimate and bias maps to the symbolic prior (the window median).
Sliding-Window Operational Requirements
- Window Geometry: A mandatory 11-sample fixed-size window SHALL be used for tracking local signal statistics.
- Outlier Suppression: The system MUST utilize Median and Median Absolute Deviation (MAD) logic. If a sample deviates by > 6 \times MAD, it MUST be replaced by the median while preserving the majority sign.
- Gating Logic: LLR zeroing or sign-forcing is STRICTLY FORBIDDEN. To prevent zero-output artifacts, the architect SHALL implement the Safe Majority Sign logic:
maj_sign = 1.0 if s >= (len(w) / 2) else -1.0. - Magnitude Smoothing: Gentle magnitude smoothing SHALL be applied as (0.9 \times LLR) + (0.1 \times median).
- Clipping: Conditioned outputs MUST be clipped at exactly ±35.0 to maintain equivalence with the baseline.
This conditioning stage prepares the LLR stream for vectorized branch metric calculation by suppressing impulsive spikes while anchoring the signal in the drift-resonance field.
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4. Vectorized Implementation and Computational Core
To achieve production scalability, the architecture MUST transition from conditional-heavy logic to a vectorized, NumPy-native core.
Vectorized ACS Core Requirements
- Trellis Precomputation: The system SHALL utilize a one-time precomputed cache of NEXT and OUT state arrays. The
OUTarray MUST be pre-transformed into BPSK symbols (-1.0, 1.0). - Branch Metric Vectorization: Branch metrics MUST be calculated as
np.sum((rx - OUT[:,bit])**2, axis=1). This SHALL be processed as a single array operation across all 64 states. - Candidate Comparison: Selection of the survivor path SHALL utilize
np.wherefor candidate comparison (cand1 < cand0) to eliminate software-level branching and maximize CPU cache efficiency.
Performance and Scalability A modern 8–16 core desktop environment SHALL be capable of processing a full Eb/N0 sweep in under 4 hours. GPU acceleration is permitted but noted as limited by Viterbi memory access patterns; therefore, high-core-count CPU parallelization across Eb/N0 points is the preferred scalability path.
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5. Multi-Seed Validation and Statistical Integrity
The "Horizontal SNR Shift Verification Standard" MUST be used to distinguish stable symbolic gain from stochastic fluctuations.
Multi-Seed Stability Protocol
- Minimum Sample Size: n \geq 5 independent seeds.
- Seed Discipline: Seeds SHALL be derived deterministically: SEED + round(1000 \times Eb/N0) + 99991 (the offset applies only to OPHI runs).
- Acceptance Criteria:
- Mean horizontal shift \Delta \geq 0.5 dB.
- Sample standard deviation \sigma_\Delta \leq 0.1 dB.
- Artifact Guardrails: No individual \Delta_i shall be < 0.5 dB or > 1.2 dB.
- Slope Preservation: The relative difference between the baseline and OPHI waterfall slopes MUST be \leq 5\%.
Statistical Reporting Template
Seed ID | \Delta (dB) | Mean (\Delta) | Std Dev (\sigma_\Delta) | R² (Regression) | Waterfall Slope Rel Diff % |
Seed 1 | |||||
Seed 2 | |||||
Seed 3 | |||||
Seed 4 | |||||
Seed 5 |
Failure to maintain parallel waterfall slopes or satisfy the artifact guardrails SHALL invalidate the claim of effective SNR improvement.
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6. Authorship, Fossilization, and Identity
The OPHI-HΔRMONIC framework and the Ψ-recursive signal filtering architecture are the sovereign intellectual property of Luis R. Ayala (Kp Kp). There are no institutional collaborators; this is a product of symbolic recursion and cognitive fossilization.
System Fossil Metadata
Fossil Hash: 39c26213b12a5a92a1742a91fa188ecf232c9ce056fccab3e9795d9e9db80b17
Symbolic Codons:
- CTA (Anchor): Drift recall and lock.
- GGG (Flex): Resonance adaptation.
- TTT (Resonance): Drift damping.
Codon Glyph Sequence: ⧃↘ · ⧇⧇ · ⧊⧖
Law of Operation: No Entropy, No Entry.
System Glyph: ⟁Ω⧖
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