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EP0431957A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Synchronization word detection apparatus

Assignee: NEC Corp
•
Filing: 1990-12-07
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Granted: —
•
Expires: 2010-12-07
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A synchronization (sync) word detection apparatus which, on receiving a signal in which a sync word having a predetermined length (N) is inserted beforehand, detects the sync word out of a demodulated and soft-decided sequence of the received signal. A cross correlator (4) calculates a cross correlation value of the soft-decided and demodulated sequence fed thereto and the sync word. A threshold generating section (1, 2, 3) determines a means power of the demodulated and soft-decided sequence and generates a threshold value on the basis of the mean power. A comparing circuit (5) produces a detection signal when the cross correlation exceeds the threshold value. The apparatus reduces the false detection probability and misdetection probability even when the receive field intensity sharply changes on a transmission path.

Inventors

  • 👤 Susumu C/O Nec Corporation Otani
  • 👤 Syouji C/O Nec Corporation Endo

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-27 23:00
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/04; H04L7/041; H04L7/042

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 105 words
A synchronization word detection apparatus for receiving a signal in which a synchronization word having a predetermined length (N) is inserted beforehand and detecting said synchronization word out of a demodulated and soft-decided sequence of said received signal, said apparatus comprising: cross correlation calculating means for calculating a cross correlation value of the demodulated and soft-decided sequence fed thereto and a stored synchronization word; means for producing a detection signal when the cross correlation exceeds a thershold value; and threshold generating means for determining a mean power of the demodulated and soft-decided sequence and generating said threshold value on the basis of said mean power.
Claim 2
Dependent Claim 54 words
An apparatus as claimed in claim 1, wherein said threshold generating means comprises: means for squaring the demodulated and soft-decided sequence to produce a square; means for producing a mean power of said squares occurring over an N-bit period; and means for generating said threshold by multiplying said mean power by a predetermined value.

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