Lab048: accelerate BPSK receiver to real-time

experiments/lab044_hackrf_bpsk_packet.py

@@ -8,6 +8,7 @@
 from __future__ import annotations
 
 import argparse
+from functools import lru_cache
 import hashlib
 import json
 import math
@@ -253,9 +254,14 @@ def validate_transmission_plan(plan: TransmissionPlan) -> None:
 # ============================================================ Независимый RX
 
 
+@lru_cache(maxsize=1)
 def _preamble_reference_samples() -> np.ndarray:
+    """Вернуть неизменяемую опорную преамбулу без повторного формирования."""
+
     waveform = _scale_and_carrier(radio.bpsk_modulate(preamble_bits()))
-    return signed_iq_bytes_to_complex64(lab043.to_cs8_bytes(waveform))
+    reference = signed_iq_bytes_to_complex64(lab043.to_cs8_bytes(waveform))
+    reference.flags.writeable = False
+    return reference
 
 
 def _detect_preamble(samples: np.ndarray) -> dict: