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PacketDetect.md

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Packet Detector

Josh Sanz [email protected]

Overview

The packet detector uses a windowed power estimate to detect the beginning and end of a packet. When all samples in the window have power greater than the threshold a packet is deemed to have started. When all samples in the window have power less than the threshold a packet is deemed to have ended.

|
|   ...........
|..:           :........
-----------------------------
    ^          ^
    pktStart   pktEnd

Only samples which are part of a packet are passed on to following blocks. The rest are discarded.

Parameters

  • protoIQ: DspComplex[T] - prototype for IQ data
  • powerThreshVal: Double - threshold for power detection
  • powerThreshWindow: Int - size of window for power thresholding
  • (unused) correlationThresh: Boolean - enables correlation thresholds
  • (unused) correlationThreshVal: Double - threshold for correlation detection
  • (unused) correlationWindow: Int - size of window for correlation detection
  • (unused) correlationStride: Int - distance between samples which should be correlated

Inputs

Decoupled interface

  • iq: DspComplex[T]

Outputs

Decoupled interface

  • iq: Vec[DspComplex[T <:Data:Real:BinaryRepresentation]] - always width 1
  • pktStart: Bool() - high at first sample of packet
  • pktEnd: Bool() - hight at last sample of packet

Tests

sbt test

Tests use static test vectors defined in the Spec file. Tests include:

  • Whether detector ignores IQ data which does not exceed the threshold for a full window
  • Whether detector finds a packet based on power alone and returns the correct samples
  • (unused) Whether detector ignores IQ data which exceeds the power threshold but is uncorrelated
  • (unused) Whether detector finds a packet with both power and correlation thresholds

TODOS

  • CFAR power-based detection
  • Correlation-based threshold and synchronization